diff --git a/packages/opentelemetry-cloud-trace-exporter/package-lock.json b/packages/opentelemetry-cloud-trace-exporter/package-lock.json
index 76b3ab6d..ddb9e47c 100644
--- a/packages/opentelemetry-cloud-trace-exporter/package-lock.json
+++ b/packages/opentelemetry-cloud-trace-exporter/package-lock.json
@@ -282,6 +282,15 @@
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     "object-inspect": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.8.0.tgz",
@@ -3309,7 +3751,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
-      "dev": true,
       "requires": {
         "wrappy": "1"
       }
@@ -3337,11 +3778,37 @@
         "word-wrap": "~1.2.3"
       }
     },
+    "optjs": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/optjs/-/optjs-3.2.2.tgz",
+      "integrity": "sha1-aabOicRCpEQDFBrS+bNwvVu29O4="
+    },
+    "os-homedir": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
+    },
+    "os-locale": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+      "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
+      "requires": {
+        "lcid": "^1.0.0"
+      }
+    },
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
-      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
-      "dev": true
+      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ="
+    },
+    "osenv": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
+      "integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
+      "requires": {
+        "os-homedir": "^1.0.0",
+        "os-tmpdir": "^1.0.0"
+      }
     },
     "p-cancelable": {
       "version": "1.1.0",
@@ -3444,8 +3911,7 @@
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
-      "dev": true
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
     "path-key": {
       "version": "2.0.1",
@@ -3510,6 +3976,11 @@
         "fast-diff": "^1.1.2"
       }
     },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+    },
     "process-on-spawn": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/process-on-spawn/-/process-on-spawn-1.0.0.tgz",
@@ -3531,6 +4002,33 @@
       "integrity": "sha512-vGrhOavPSTz4QVNuBNdcNXePNdNMaO1xj9yBeH1ScQPjk/rhg9sSlCXPhMkFuaNNW/syTvYqsnbIJxMBfRbbag==",
       "dev": true
     },
+    "protobufjs": {
+      "version": "6.10.1",
+      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-6.10.1.tgz",
+      "integrity": "sha512-pb8kTchL+1Ceg4lFd5XUpK8PdWacbvV5SK2ULH2ebrYtl4GjJmS24m6CKME67jzV53tbJxHlnNOSqQHbTsR9JQ==",
+      "requires": {
+        "@protobufjs/aspromise": "^1.1.2",
+        "@protobufjs/base64": "^1.1.2",
+        "@protobufjs/codegen": "^2.0.4",
+        "@protobufjs/eventemitter": "^1.1.0",
+        "@protobufjs/fetch": "^1.1.0",
+        "@protobufjs/float": "^1.0.2",
+        "@protobufjs/inquire": "^1.1.0",
+        "@protobufjs/path": "^1.1.2",
+        "@protobufjs/pool": "^1.1.0",
+        "@protobufjs/utf8": "^1.1.0",
+        "@types/long": "^4.0.1",
+        "@types/node": "^13.7.0",
+        "long": "^4.0.0"
+      },
+      "dependencies": {
+        "@types/node": {
+          "version": "13.13.15",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-13.13.15.tgz",
+          "integrity": "sha512-kwbcs0jySLxzLsa2nWUAGOd/s21WU1jebrEdtzhsj1D4Yps1EOuyI1Qcu+FD56dL7NRNIJtDDjcqIG22NwkgLw=="
+        }
+      }
+    },
     "pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
@@ -3556,11 +4054,6 @@
         "escape-goat": "^2.0.0"
       }
     },
-    "qs": {
-      "version": "6.9.4",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.4.tgz",
-      "integrity": "sha512-A1kFqHekCTM7cz0udomYUoYNWjBebHm/5wzU/XqrBRBNWectVH0QIiN+NEcZ0Dte5hvzHwbr8+XQmguPhJ6WdQ=="
-    },
     "quick-lru": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/quick-lru/-/quick-lru-4.0.1.tgz",
@@ -3571,7 +4064,6 @@
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
       "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
-      "dev": true,
       "requires": {
         "deep-extend": "^0.6.0",
         "ini": "~1.3.0",
@@ -3582,8 +4074,7 @@
         "strip-json-comments": {
           "version": "2.0.1",
           "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
-          "dev": true
+          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
         }
       }
     },
@@ -3618,6 +4109,32 @@
         "type-fest": "^0.8.1"
       }
     },
+    "readable-stream": {
+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+      "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+      "requires": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
     "readdirp": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.2.0.tgz",
@@ -3748,8 +4265,12 @@
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
+    "sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
     },
     "semver": {
       "version": "7.3.2",
@@ -3776,8 +4297,7 @@
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
     },
     "shebang-command": {
       "version": "1.2.0",
@@ -3797,8 +4317,7 @@
     "signal-exit": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
-      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==",
-      "dev": true
+      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA=="
     },
     "sinon": {
       "version": "9.0.2",
@@ -4004,6 +4523,21 @@
         "es-abstract": "^1.17.5"
       }
     },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
     "strip-ansi": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
@@ -4100,6 +4634,20 @@
         }
       }
     },
+    "tar": {
+      "version": "4.4.13",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
+      "integrity": "sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==",
+      "requires": {
+        "chownr": "^1.1.1",
+        "fs-minipass": "^1.2.5",
+        "minipass": "^2.8.6",
+        "minizlib": "^1.2.1",
+        "mkdirp": "^0.5.0",
+        "safe-buffer": "^5.1.2",
+        "yallist": "^3.0.3"
+      }
+    },
     "teeny-request": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-6.0.1.tgz",
@@ -4379,21 +4927,16 @@
         "prepend-http": "^2.0.0"
       }
     },
-    "url-template": {
-      "version": "2.0.8",
-      "resolved": "https://registry.npmjs.org/url-template/-/url-template-2.0.8.tgz",
-      "integrity": "sha1-/FZaPMy/93MMd19WQflVV5FDnyE="
-    },
     "urlgrey": {
       "version": "0.4.4",
       "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
       "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
       "dev": true
     },
-    "uuid": {
-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-7.0.3.tgz",
-      "integrity": "sha512-DPSke0pXhTZgoF/d+WSt2QaKMCFSfx7QegxEWT+JOuHF5aWrKEn0G+ztjuJg/gG8/ItK+rbPCD/yNv8yyih6Cg=="
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "v8-compile-cache": {
       "version": "2.1.1",
@@ -4411,6 +4954,11 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "walkdir": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/walkdir/-/walkdir-0.4.1.tgz",
+      "integrity": "sha512-3eBwRyEln6E1MSzcxcVpQIhRG8Q1jLvEqRmCZqS3dsfXEDR/AhOF4d+jHg1qvDCpYaVRZjENPQyrVxAkQqxPgQ=="
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -4430,7 +4978,6 @@
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
-      "dev": true,
       "requires": {
         "string-width": "^1.0.2 || 2"
       },
@@ -4438,20 +4985,17 @@
         "ansi-regex": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
-          "dev": true
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
         },
         "is-fullwidth-code-point": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
         },
         "string-width": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
           "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
-          "dev": true,
           "requires": {
             "is-fullwidth-code-point": "^2.0.0",
             "strip-ansi": "^4.0.0"
@@ -4461,7 +5005,6 @@
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true,
           "requires": {
             "ansi-regex": "^3.0.0"
           }
@@ -4477,6 +5020,11 @@
         "string-width": "^4.0.0"
       }
     },
+    "window-size": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
+      "integrity": "sha1-+OGqHuWlPsW/FR/6CXQqatdpeHY="
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
@@ -4546,8 +5094,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "1.0.3",
diff --git a/packages/opentelemetry-cloud-trace-exporter/package.json b/packages/opentelemetry-cloud-trace-exporter/package.json
index 5dd1089a..54e4a781 100644
--- a/packages/opentelemetry-cloud-trace-exporter/package.json
+++ b/packages/opentelemetry-cloud-trace-exporter/package.json
@@ -51,12 +51,14 @@
     "typescript": "3.9.7"
   },
   "dependencies": {
+    "@grpc/proto-loader": "^0.5.4",
     "@opentelemetry/api": "^0.7.0",
     "@opentelemetry/base": "^0.7.0",
     "@opentelemetry/core": "^0.7.0",
     "@opentelemetry/resources": "^0.7.0",
     "@opentelemetry/tracing": "^0.7.0",
     "google-auth-library": "^5.7.0",
-    "googleapis": "^46.0.0"
+    "google-proto-files": "^2.1.0",
+    "grpc": "^1.24.3"
   }
 }
diff --git a/packages/opentelemetry-cloud-trace-exporter/src/trace.ts b/packages/opentelemetry-cloud-trace-exporter/src/trace.ts
index a8650f05..fba43086 100644
--- a/packages/opentelemetry-cloud-trace-exporter/src/trace.ts
+++ b/packages/opentelemetry-cloud-trace-exporter/src/trace.ts
@@ -16,14 +16,16 @@ import { ExportResult } from '@opentelemetry/base';
 import { NoopLogger } from '@opentelemetry/core';
 import { ReadableSpan, SpanExporter } from '@opentelemetry/tracing';
 import { Logger } from '@opentelemetry/api';
+import * as protoloader from '@grpc/proto-loader';
+import * as protofiles from 'google-proto-files';
+import * as grpc from 'grpc';
 import { GoogleAuth } from 'google-auth-library';
-import { google } from 'googleapis';
+import { promisify } from 'util';
 import { TraceExporterOptions } from './external-types';
 import { getReadableSpanTransformer } from './transform';
-import { Span, SpansWithCredentials } from './types';
+import { TraceService, NamedSpans } from './types';
 
 const OT_REQUEST_HEADER = 'x-opentelemetry-outgoing-request';
-google.options({ headers: { [OT_REQUEST_HEADER]: 1 } });
 
 /**
  * Format and sends span information to Google Cloud Trace.
@@ -32,8 +34,7 @@ export class TraceExporter implements SpanExporter {
   private _projectId: string | void | Promise<string | void>;
   private readonly _logger: Logger;
   private readonly _auth: GoogleAuth;
-
-  private static readonly _cloudTrace = google.cloudtrace('v2');
+  private _traceServiceClient?: TraceService = undefined;
 
   constructor(options: TraceExporterOptions = {}) {
     this._logger = options.logger || new NoopLogger();
@@ -70,22 +71,14 @@ export class TraceExporter implements SpanExporter {
     }
 
     this._logger.debug('Google Cloud Trace export');
-    const authorizedSpans = await this._authorize(
-      spans.map(getReadableSpanTransformer(this._projectId))
-    );
 
-    if (!authorizedSpans) {
-      return resultCallback(ExportResult.FAILED_NOT_RETRYABLE);
-    }
-    this._logger.debug('Google Cloud Trace got span authorization');
+    const namedSpans: NamedSpans = {
+      name: `projects/${this._projectId}`,
+      spans: spans.map(getReadableSpanTransformer(this._projectId)),
+    };
 
-    try {
-      await this._batchWriteSpans(authorizedSpans);
-      resultCallback(ExportResult.SUCCESS);
-    } catch (err) {
-      this._logger.error(`Google Cloud Trace failed to export ${err}`);
-      resultCallback(ExportResult.FAILED_RETRYABLE);
-    }
+    const result = await this._batchWriteSpans(namedSpans);
+    resultCallback(result);
   }
 
   shutdown(): void {}
@@ -95,49 +88,62 @@ export class TraceExporter implements SpanExporter {
    * service.
    * @param spans
    */
-  private _batchWriteSpans(spans: SpansWithCredentials) {
+  private async _batchWriteSpans(spans: NamedSpans): Promise<ExportResult> {
     this._logger.debug('Google Cloud Trace batch writing traces');
+    try {
+      this._traceServiceClient = await this._getClient();
+    } catch (err) {
+      err.message = `failed to create client: ${err.message}`;
+      this._logger.error(err.message);
+      return ExportResult.FAILED_NOT_RETRYABLE;
+    }
 
-    return new Promise((resolve, reject) => {
-      // @todo Consider to use gRPC call (BatchWriteSpansRequest) for sending
-      // data to backend :
-      // https://cloud.google.com/trace/docs/reference/v2/rpc/google.devtools.
-      // cloudtrace.v2#google.devtools.cloudtrace.v2.TraceService
-      TraceExporter._cloudTrace.projects.traces.batchWrite(
-        spans,
-        (err: Error | null) => {
-          if (err) {
-            err.message = `batchWriteSpans error: ${err.message}`;
-            this._logger.error(err.message);
-            reject(err);
-          } else {
-            const successMsg = 'batchWriteSpans successfully';
-            this._logger.debug(successMsg);
-            resolve(successMsg);
-          }
-        }
-      );
-    });
+    const metadata = new grpc.Metadata();
+    metadata.add(OT_REQUEST_HEADER, '1');
+    const batchWriteSpans = promisify(
+      this._traceServiceClient.BatchWriteSpans
+    ).bind(this._traceServiceClient);
+    try {
+      await batchWriteSpans(spans, metadata);
+      this._logger.debug('batchWriteSpans successfully');
+      return ExportResult.SUCCESS;
+    } catch (err) {
+      err.message = `batchWriteSpans error: ${err.message}`;
+      this._logger.error(err.message);
+      return ExportResult.FAILED_RETRYABLE;
+    }
   }
 
   /**
-   * Gets the Google Application Credentials from the environment variables,
-   * authenticates the client and calls a method to send the spans data.
-   * @param spans The spans to export
+   * If the rpc client is not already initialized,
+   * authenticates with google credentials and initializes the rpc client
    */
-  private async _authorize(
-    spans: Span[]
-  ): Promise<SpansWithCredentials | null> {
-    try {
-      return {
-        name: `projects/${this._projectId}`,
-        resource: { spans },
-        auth: await this._auth.getClient(),
-      };
-    } catch (err) {
-      err.message = `authorize error: ${err.message}`;
-      this._logger.error(err.message);
-      return null;
+  private async _getClient(): Promise<TraceService> {
+    if (this._traceServiceClient) {
+      return this._traceServiceClient;
     }
+    this._logger.debug('Google Cloud Trace authenticating');
+    const creds = await this._auth.getClient();
+    this._logger.debug(
+      'Google Cloud Trace got authentication. Initializaing rpc client'
+    );
+    const packageDefinition = await protoloader.load(
+      protofiles.getProtoPath('devtools', 'cloudtrace', 'v2', 'tracing.proto'),
+      {
+        includeDirs: [protofiles.getProtoPath('..')],
+        longs: String,
+        defaults: true,
+        oneofs: true,
+      }
+    );
+    /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+    const { google }: any = grpc.loadPackageDefinition(packageDefinition);
+    const traceService = google.devtools.cloudtrace.v2.TraceService;
+    const sslCreds = grpc.credentials.createSsl();
+    const callCreds = grpc.credentials.createFromGoogleCredential(creds);
+    return new traceService(
+      'cloudtrace.googleapis.com:443',
+      grpc.credentials.combineChannelCredentials(sslCreds, callCreds)
+    );
   }
 }
diff --git a/packages/opentelemetry-cloud-trace-exporter/src/transform.ts b/packages/opentelemetry-cloud-trace-exporter/src/transform.ts
index 03df8178..aee50472 100644
--- a/packages/opentelemetry-cloud-trace-exporter/src/transform.ts
+++ b/packages/opentelemetry-cloud-trace-exporter/src/transform.ts
@@ -13,10 +13,7 @@
 // limitations under the License.
 
 import * as ot from '@opentelemetry/api';
-import {
-  hrTimeToTimeStamp,
-  VERSION as CORE_VERSION,
-} from '@opentelemetry/core';
+import { VERSION as CORE_VERSION } from '@opentelemetry/core';
 import { Resource } from '@opentelemetry/resources';
 import { ReadableSpan } from '@opentelemetry/tracing';
 import {
@@ -26,6 +23,7 @@ import {
   Link,
   LinkType,
   Span,
+  Timestamp,
   TruncatableString,
 } from './types';
 import { VERSION } from './version';
@@ -52,15 +50,15 @@ export function getReadableSpanTransformer(
       links: {
         link: span.links.map(transformLink),
       },
-      endTime: hrTimeToTimeStamp(span.endTime),
-      startTime: hrTimeToTimeStamp(span.startTime),
+      endTime: transformTime(span.endTime),
+      startTime: transformTime(span.startTime),
       name: `projects/${projectId}/traces/${span.spanContext.traceId}/spans/${span.spanContext.spanId}`,
       spanId: span.spanContext.spanId,
-      sameProcessAsParentSpan: !span.spanContext.isRemote,
+      sameProcessAsParentSpan: { value: !span.spanContext.isRemote },
       status: span.status,
       timeEvents: {
         timeEvent: span.events.map(e => ({
-          time: hrTimeToTimeStamp(e.time),
+          time: transformTime(e.time),
           annotation: {
             attributes: transformAttributes(e.attributes),
             description: stringToTruncatableString(e.name),
@@ -77,6 +75,13 @@ export function getReadableSpanTransformer(
   };
 }
 
+function transformTime(time: ot.HrTime): Timestamp {
+  return {
+    seconds: time[0],
+    nanos: time[1],
+  };
+}
+
 function transformLink(link: ot.Link): Link {
   return {
     attributes: transformAttributes(link.attributes),
diff --git a/packages/opentelemetry-cloud-trace-exporter/src/types.ts b/packages/opentelemetry-cloud-trace-exporter/src/types.ts
index e37863b3..57017edf 100644
--- a/packages/opentelemetry-cloud-trace-exporter/src/types.ts
+++ b/packages/opentelemetry-cloud-trace-exporter/src/types.ts
@@ -12,15 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import { Compute, JWT, OAuth2Client } from 'google-auth-library';
+import { Metadata } from 'grpc';
 
 export interface Span {
   name?: string;
   spanId?: string;
   parentSpanId?: string;
   displayName?: TruncatableString;
-  startTime?: string;
-  endTime?: string;
+  startTime?: Timestamp;
+  endTime?: Timestamp;
   attributes?: Attributes;
   // This property is currently unused. keeping it here as it is part
   // of the stack driver trace types and may be used in the future
@@ -28,10 +28,15 @@ export interface Span {
   timeEvents?: TimeEvents;
   links?: Links;
   status?: Status;
-  sameProcessAsParentSpan?: boolean;
+  sameProcessAsParentSpan?: BoolValue;
   childSpanCount?: number;
 }
 
+export interface Timestamp {
+  seconds: number;
+  nanos: number;
+}
+
 export interface AttributeMap {
   [key: string]: AttributeValue;
 }
@@ -103,7 +108,7 @@ export interface TimeEvents {
 
 export interface TimeEvent {
   annotation?: Annotation;
-  time?: string;
+  time?: Timestamp;
   // This property is currently unused. keeping it here as it is part
   // of the stack driver trace types and may be used in the future
   messageEvent?: MessageEvent;
@@ -133,8 +138,22 @@ export enum LinkType {
   PARENT_LINKED_SPAN = 2,
 }
 
-export interface SpansWithCredentials {
+/**
+ * A protobuf boolean
+ */
+export interface BoolValue {
+  value: boolean;
+}
+
+export interface NamedSpans {
   name: string;
-  resource: { spans: {} };
-  auth: JWT | OAuth2Client | Compute;
+  spans: Span[];
+}
+
+export interface TraceService {
+  BatchWriteSpans: (
+    call: NamedSpans,
+    metadata: Metadata,
+    callback: Function
+  ) => void;
 }
diff --git a/packages/opentelemetry-cloud-trace-exporter/test/exporter.test.ts b/packages/opentelemetry-cloud-trace-exporter/test/exporter.test.ts
index ed49fc2c..4c1fba5a 100644
--- a/packages/opentelemetry-cloud-trace-exporter/test/exporter.test.ts
+++ b/packages/opentelemetry-cloud-trace-exporter/test/exporter.test.ts
@@ -21,7 +21,11 @@ import { ReadableSpan } from '@opentelemetry/tracing';
 import * as assert from 'assert';
 import * as nock from 'nock';
 import * as sinon from 'sinon';
+import * as protoloader from '@grpc/proto-loader';
+import * as grpc from 'grpc';
+import { OAuth2Client } from 'google-auth-library';
 import { TraceExporter } from '../src';
+import { TraceService } from '../src/types';
 
 describe('Google Cloud Trace Exporter', () => {
   beforeEach(() => {
@@ -45,10 +49,26 @@ describe('Google Cloud Trace Exporter', () => {
   });
 
   describe('export', () => {
+    const mockChannelCreds: grpc.ChannelCredentials = {
+      compose: sinon.stub(),
+    };
+    const mockCallCreds: grpc.CallCredentials = {
+      compose: sinon.stub(),
+      generateMetadata: sinon.stub(),
+    };
+    const mockCombinedCreds: grpc.ChannelCredentials = {
+      compose: sinon.stub(),
+    };
+    const mockClient = sinon.mock(OAuth2Client);
+
     let exporter: TraceExporter;
     let logger: ConsoleLogger;
     /* tslint:disable-next-line:no-any */
-    let batchWrite: sinon.SinonSpy<[any, any], any>;
+    let batchWrite: sinon.SinonSpy<[any, any, any], any>;
+    let traceServiceConstructor: sinon.SinonSpy;
+    let createSsl: sinon.SinonStub;
+    let createFromGoogleCreds: sinon.SinonStub;
+    let combineChannelCreds: sinon.SinonStub;
     let debug: sinon.SinonSpy;
     let info: sinon.SinonSpy;
     let warn: sinon.SinonSpy;
@@ -65,8 +85,13 @@ describe('Google Cloud Trace Exporter', () => {
       });
 
       batchWrite = sinon.spy(
-        /* tslint:disable-next-line:no-any */
-        (spans: any, callback: (err: Error | null) => void): any => {
+        /* tslint:disable:no-any */
+        (
+          spans: any,
+          metadata: any,
+          callback: (err: Error | null) => void
+        ): any => {
+          /* tslint:enable:no-any */
           if (batchWriteShouldFail) {
             callback(new Error('fail'));
           } else {
@@ -75,21 +100,58 @@ describe('Google Cloud Trace Exporter', () => {
         }
       );
 
-      sinon.replace(
-        TraceExporter['_cloudTrace'].projects.traces,
-        'batchWrite',
-        /* tslint:disable-next-line:no-any */
-        batchWrite as any
-      );
-
       sinon.replace(exporter['_auth'], 'getClient', () => {
         if (getClientShouldFail) {
           throw new Error('fail');
         }
         /* tslint:disable-next-line:no-any */
-        return {} as any;
+        return mockClient as any;
       });
 
+      sinon.stub(protoloader, 'loadSync');
+
+      createSsl = sinon
+        .stub(grpc.credentials, 'createSsl')
+        .returns(mockChannelCreds);
+
+      createFromGoogleCreds = sinon
+        .stub(grpc.credentials, 'createFromGoogleCredential')
+        .returns(mockCallCreds);
+
+      combineChannelCreds = sinon
+        .stub(grpc.credentials, 'combineChannelCredentials')
+        .returns(mockCombinedCreds);
+
+      sinon.replace(
+        grpc,
+        'loadPackageDefinition',
+        (): grpc.GrpcObject => {
+          traceServiceConstructor = sinon.spy(
+            (host: string, creds: grpc.ChannelCredentials) => {}
+          );
+          /* tslint:disable-next-line:no-any */
+          const def: any = {
+            google: {
+              devtools: {
+                cloudtrace: {
+                  v2: {},
+                },
+              },
+            },
+          };
+          // Replace the TraceService with a mock TraceService
+          def.google.devtools.cloudtrace.v2.TraceService = class MockTraceService
+            implements TraceService {
+            /* tslint:disable-next-line:variable-name */
+            BatchWriteSpans = batchWrite;
+            constructor(host: string, creds: grpc.ChannelCredentials) {
+              traceServiceConstructor(host, creds);
+            }
+          };
+          return def;
+        }
+      );
+
       debug = sinon.spy();
       info = sinon.spy();
       warn = sinon.spy();
@@ -133,13 +195,66 @@ describe('Google Cloud Trace Exporter', () => {
       });
 
       assert.deepStrictEqual(
-        batchWrite.getCall(0).args[0].resource.spans[0].displayName.value,
+        batchWrite.getCall(0).args[0].spans[0].displayName.value,
         'my-span'
       );
 
+      assert(createSsl.calledOnceWithExactly());
+      assert(createFromGoogleCreds.calledOnceWithExactly(mockClient));
+      assert(
+        combineChannelCreds.calledOnceWithExactly(
+          mockChannelCreds,
+          mockCallCreds
+        )
+      );
+      assert(
+        traceServiceConstructor.calledOnceWithExactly(
+          'cloudtrace.googleapis.com:443',
+          mockCombinedCreds
+        )
+      );
       assert.deepStrictEqual(result, ExportResult.SUCCESS);
     });
 
+    it('should memoize the rpc client', async () => {
+      const readableSpan: ReadableSpan = {
+        attributes: {},
+        duration: [32, 800000000],
+        startTime: [1566156729, 709],
+        endTime: [1566156731, 709],
+        ended: true,
+        events: [],
+        kind: types.SpanKind.CLIENT,
+        links: [],
+        name: 'my-span',
+        spanContext: {
+          traceId: 'd4cda95b652f4a1592b449d5929fda1b',
+          spanId: '6e0c63257de34c92',
+          traceFlags: TraceFlags.NONE,
+          isRemote: true,
+        },
+        status: { code: types.CanonicalCode.OK },
+        resource: Resource.empty(),
+      };
+
+      await new Promise((resolve, reject) => {
+        exporter.export([readableSpan], result => {
+          resolve(result);
+        });
+      });
+
+      await new Promise((resolve, reject) => {
+        exporter.export([readableSpan], result => {
+          resolve(result);
+        });
+      });
+
+      assert(createSsl.calledOnce);
+      assert(createFromGoogleCreds.calledOnce);
+      assert(combineChannelCreds.calledOnce);
+      assert(traceServiceConstructor.calledOnce);
+    });
+
     it('should return not retryable if authorization fails', async () => {
       const readableSpan: ReadableSpan = {
         attributes: {},
@@ -168,9 +283,8 @@ describe('Google Cloud Trace Exporter', () => {
           resolve(result);
         });
       });
-
-      assert(batchWrite.notCalled);
-      assert(error.getCall(0).args[0].match(/authorize error: fail/));
+      assert(error.getCall(0).args[0].match(/failed to create client: fail/));
+      assert(traceServiceConstructor.calledOnce);
       assert.deepStrictEqual(result, ExportResult.FAILED_NOT_RETRYABLE);
     });
 
@@ -202,7 +316,6 @@ describe('Google Cloud Trace Exporter', () => {
           resolve(result);
         });
       });
-
       assert.deepStrictEqual(result, ExportResult.FAILED_RETRYABLE);
     });
 
diff --git a/packages/opentelemetry-cloud-trace-exporter/test/transform.test.ts b/packages/opentelemetry-cloud-trace-exporter/test/transform.test.ts
index 1e786c4e..9406368a 100644
--- a/packages/opentelemetry-cloud-trace-exporter/test/transform.test.ts
+++ b/packages/opentelemetry-cloud-trace-exporter/test/transform.test.ts
@@ -76,14 +76,14 @@ describe('transform', () => {
       },
       displayName: { value: 'my-span' },
       links: { link: [] },
-      endTime: '2019-08-18T19:32:11.000000709Z',
-      startTime: '2019-08-18T19:32:09.000000709Z',
+      endTime: { seconds: 1566156731, nanos: 709 },
+      startTime: { seconds: 1566156729, nanos: 709 },
       name:
         'projects/project-id/traces/d4cda95b652f4a1592b449d5929fda1b/spans/6e0c63257de34c92',
       spanId: '6e0c63257de34c92',
       status: { code: 0 },
       timeEvents: { timeEvent: [] },
-      sameProcessAsParentSpan: false,
+      sameProcessAsParentSpan: { value: false },
     });
   });
   it('should transform spans with parent', () => {
@@ -100,13 +100,13 @@ describe('transform', () => {
 
   it('should transform remote spans', () => {
     const remote = transformer(readableSpan);
-    assert.deepStrictEqual(remote.sameProcessAsParentSpan, false);
+    assert.deepStrictEqual(remote.sameProcessAsParentSpan, { value: false });
   });
 
   it('should transform local spans', () => {
     readableSpan.spanContext.isRemote = false;
     const local = transformer(readableSpan);
-    assert.deepStrictEqual(local.sameProcessAsParentSpan, true);
+    assert.deepStrictEqual(local.sameProcessAsParentSpan, { value: true });
   });
 
   it('should transform attributes', () => {
@@ -218,7 +218,7 @@ describe('transform', () => {
               value: 'something happened',
             },
           },
-          time: '2019-08-18T19:32:09.000000809Z',
+          time: { seconds: 1566156729, nanos: 809 },
         },
       ],
     });
@@ -252,7 +252,7 @@ describe('transform', () => {
               value: 'something happened',
             },
           },
-          time: '2019-08-18T19:32:09.000000809Z',
+          time: { seconds: 1566156729, nanos: 809 },
         },
       ],
     });