diff --git a/.gitmodules b/.gitmodules
index b144fa1cc..08e822e5c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -229,3 +229,6 @@
 [submodule "range-v3"]
 	path = lib-shared/range-v3
 	url = https://github.com/ericniebler/range-v3.git
+[submodule "eternal"]
+	path = lib-shared/eternal
+	url = https://github.com/mapbox/eternal.git
diff --git a/eth-sender/source/main.cpp b/eth-sender/source/main.cpp
index b2a52b9fa..84bbf788a 100644
--- a/eth-sender/source/main.cpp
+++ b/eth-sender/source/main.cpp
@@ -26,6 +26,10 @@
 #include <boost/program_options/options_description.hpp>
 #include <boost/program_options/variables_map.hpp>
 
+#include <ctre.hpp>
+
+#include <mapbox/eternal.hpp>
+
 #include "base58.hpp"
 #include "contract.hpp"
 #include "currency.hpp"
@@ -971,8 +975,8 @@ task<void> CommandChain(const std::string &command, Args &args, const S<Chain> &
         co_return co_await CommandExecutor(args, chain_, executor_);
 
     } else if (command == "secret") {
-        const auto secret(Option<Bytes>(args()));
-        executor_ = Make<SecretExecutor>(secret);
+        const auto path(Option<std::string>(args()));
+        executor_ = Make<SecretExecutor>(Bless(Chomp(Load(path))));
         co_return co_await CommandExecutor(args, chain_, executor_);
 
     } else if (command == "trezor") {
@@ -1006,8 +1010,50 @@ task<void> CommandChain(const std::string &command, Args &args, const S<Chain> &
 }
 
 task<void> CommandEvm(Args &args) {
-    const auto rpc(args());
-    chain_ = co_await Chain::New(Endpoint{rpc, base_});
+    using ctre::literals::operator""_ctre;
+
+    constexpr const auto chains(mapbox::eternal::map<mapbox::eternal::string, std::tuple<uint64_t, mapbox::eternal::string, mapbox::eternal::string>>({
+        {"arbitrum", {42161, "ETH", "https://arb1.arbitrum.io/rpc"}},
+        {"aurora", {1313161554, "NEAR", "https://mainnet.aurora.dev/"}},
+        {"avalanche", {43114, "AVAX", "https://api.avax.network/ext/bc/C/rpc"}},
+        {"base", {8453, "ETH", "https://mainnet.base.org/"}},
+        {"binance", {56, "BNB", "https://bsc-dataseed.binance.org/"}},
+        {"boba", {288, "ETH", "https://mainnet.boba.network/"}},
+        {"celo", {42220, "CELO", "https://forno.celo.org/"}},
+        {"etc", {61, "ETC", "https://etc.rivet.link/"}},
+        {"ethereum", {1, "ETH", "https://cloudflare-eth.com/"}},
+        {"ftm", {250, "FTM", "https://rpc.ftm.tools/"}},
+        {"fuse", {122, "FUSE", "https://rpc.fuse.io/"}},
+        {"gnosis", {100, "DAI", "https://rpc.gnosischain.com/"}},
+        {"heco", {128, "HECO", "https://http-mainnet.hecochain.com/"}},
+        {"klaytn", {8217, "KLAY", "https://public-en-cypress.klaytn.net/"}},
+        {"metis", {1088, "ETH", "https://andromeda.metis.io/?owner=1088"}},
+        {"moonriver", {1285, "MOVR", "https://rpc.moonriver.moonbeam.network/"}},
+        {"neon", {245022934, "NEON", "https://neon-proxy-mainnet.solana.p2p.org/"}},
+        {"okex", {66, "OKT", "https://exchainrpc.okex.org/"}},
+        {"optimism", {10, "ETH", "https://mainnet.optimism.io/"}},
+        {"polygon", {137, "MATIC", "https://polygon-rpc.com/"}},
+        {"ronin", {2020, "RON", "https://api.roninchain.com/rpc"}},
+        {"rsk", {30, "BTC", "https://public-node.rsk.co/"}},
+        {"telos", {40, "TLOS", "https://mainnet.telos.net/evm"}},
+    }));
+
+    if (const auto command(args()); false) {
+    } else if (command == "chains") {
+        for (auto i(chains.begin()); i != chains.end(); ++i)
+            std::cout << i->first.c_str() << " " << std::get<0>(i->second) << " " << std::get<1>(i->second).c_str() << " " << std::get<2>(i->second).c_str() << std::endl;
+        co_return;
+    } else if (command == "chain") {
+        const auto arg(args());
+        const auto chain(chains.find(arg.c_str()));
+        orc_assert_(chain != chains.end(), "unknown chain " << arg);
+        currency_ = std::get<1>(chain->second).c_str();
+        chain_ = co_await Chain::New(Endpoint{std::get<2>(chain->second).c_str(), base_}, std::get<0>(chain->second));
+    } else if (command == "rpc") {
+        const auto arg(args());
+        orc_assert_("https?://.*"_ctre.match(arg), "invalid RPC URL: " << arg);
+        chain_ = co_await Chain::New(Endpoint{arg, base_});
+    } else orc_assert_(false, "unknown command " << command);
 
     #define ORC_PARAM(name, prefix, suffix) \
         else if (arg == "--" #name) { \
@@ -1017,7 +1063,6 @@ task<void> CommandEvm(Args &args) {
             prefix name##suffix = Option<decltype(prefix name##suffix)>(args()); \
         }
 
-    // XXX: this should get moved into CommandEvm
     const auto command([&]() { for (;;) {
         auto arg(args());
         orc_assert(!arg.empty());
diff --git a/lib-shared/eternal b/lib-shared/eternal
new file mode 160000
index 000000000..dd2f5b9ff
--- /dev/null
+++ b/lib-shared/eternal
@@ -0,0 +1 @@
+Subproject commit dd2f5b9ff38fcd36b59efd9d289127fa73efc6cb
diff --git a/lib-shared/source/address.cpp b/lib-shared/source/address.cpp
index f82229d66..a8b8f8f7d 100644
--- a/lib-shared/source/address.cpp
+++ b/lib-shared/source/address.cpp
@@ -20,20 +20,19 @@
 /* }}} */
 
 
+#include <ctre.hpp>
+
 #include <eEVM/util.h>
 
 #include "address.hpp"
-#include "ctre.hpp"
 #include "error.hpp"
 
 namespace orc {
 
-// NOLINTNEXTLINE(google-build-using-namespace)
-using namespace ctre::literals;
-
 Address::Address(const std::string_view &address) :
     uint160_t(address)
 {
+    using ctre::literals::operator""_ctre;
     orc_assert_("0x[0-9a-fA-F]{40}"_ctre.match(address), "invalid address " << address);
     //orc_assert(eevm::is_checksum_address(address));
 }
diff --git a/lib-shared/source/buffer.cpp b/lib-shared/source/buffer.cpp
index b42fc1a31..e4e7dd111 100644
--- a/lib-shared/source/buffer.cpp
+++ b/lib-shared/source/buffer.cpp
@@ -204,6 +204,13 @@ std::string Join(const std::string &delimeter, const std::vector<std::string> &a
     return data.str();
 }
 
+std::string Chomp(std::string &&value) {
+    const auto size(value.size());
+    if (size != 0 && value[size - 1] == '\n')
+        value.resize(size - 1);
+    return std::move(value);
+}
+
 Mutable &Mutable::operator =(const Buffer &buffer) {
     auto here(data());
     size_t rest(size());
diff --git a/lib-shared/source/buffer.hpp b/lib-shared/source/buffer.hpp
index 1f5ca4f4a..e7cfe228c 100644
--- a/lib-shared/source/buffer.hpp
+++ b/lib-shared/source/buffer.hpp
@@ -326,6 +326,8 @@ auto Split(const View &value, const View &delimeter) {
 
 std::string Join(const std::string &delimeter, const std::vector<std::string> &args);
 
+std::string Chomp(std::string &&value);
+
 template <typename Value_>
 auto Keys(const std::map<std::string, Value_> &args) {
     std::vector<std::string> keys;
diff --git a/lib-shared/target.mk b/lib-shared/target.mk
index b2f89aabf..048683dc7 100644
--- a/lib-shared/target.mk
+++ b/lib-shared/target.mk
@@ -57,6 +57,9 @@ endif
 cflags += -I$(pwd)/ctre/single-header
 
 
+cflags += -I$(pwd)/eternal/include
+
+
 source += $(wildcard $(pwd)/jsoncpp/src/lib_json/*.cpp)
 cflags += -I$(pwd)/jsoncpp/include