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XGA Builder API

Mock Builder REST API

Introduction

This API allows Builders to enable and disable errors and modifications for various payloads. It provides endpoints to manage errors on payload requests and reveals, as well as to modify payload attributes and the payload itself.

Endpoints Summary

Method Endpoint Description
DELETE /mock/errors/payload_request Disables errors on /eth/v1/builder/header/...
POST /mock/errors/payload_request Enables errors on /eth/v1/builder/header/...
POST /mock/errors/payload_request/{slotOrEpoch}/{slotOrEpochNumber} Enables errors on /eth/v1/builder/header/... starting at the specified slot or epoch
DELETE /mock/errors/payload_reveal Disables errors on /eth/v1/builder/blinded_blocks
POST /mock/errors/payload_reveal Enables errors on /eth/v1/builder/blinded_blocks
POST /mock/errors/payload_reveal/{slotOrEpoch}/{slotOrEpochNumber} Enables errors on /eth/v1/builder/blinded_blocks starting at the specified slot or epoch
DELETE /mock/invalid/payload_attributes Disables any payload attributes modification
POST /mock/invalid/payload_attributes/{type} Enables specified type of payload attributes modification
POST /mock/invalid/payload_attributes/{type}/{slotOrEpoch}/{slotOrEpochNumber} Enables specified type of payload attributes modification starting at the specified slot or epoch
DELETE /mock/invalid/payload Disables any modification to payload built
POST /mock/invalid/payload/{type} Enables specified type of modification to payload built
POST /mock/invalid/payload/{type}/{slotOrEpoch}/{slotOrEpochNumber} Enables specified type of modification to payload built starting at the specified slot or epoch

Detailed Endpoint Documentation

Mock Error Endpoints

  • DELETE /mock/errors/payload_request

    • Description: Disables errors on /eth/v1/builder/header/....
    • Responses:
      • 200: Errors disabled successfully.

  • POST /mock/errors/payload_request

    • Description: Enables errors on /eth/v1/builder/header/....
    • Responses:
      • 200: Errors enabled successfully.

  • POST /mock/errors/payload_request/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables errors on /eth/v1/builder/header/... starting at the specified slot or epoch.
    • Parameters:
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling errors.
    • Responses:
      • 200: Errors enabled successfully.

  • DELETE /mock/errors/payload_reveal

    • Description: Disables errors on /eth/v1/builder/blinded_blocks.
    • Responses:
      • 200: Errors disabled successfully.

  • POST /mock/errors/payload_reveal

    • Description: Enables errors on /eth/v1/builder/blinded_blocks.
    • Responses:
      • 200: Errors enabled successfully.

  • POST /mock/errors/payload_reveal/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables errors on /eth/v1/builder/blinded_blocks starting at the specified slot or epoch.
    • Parameters:
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling errors.
    • Responses:
      • 200: Errors enabled successfully.

Mock Built Payloads Endpoints

  • DELETE /mock/invalid/payload_attributes

    • Description: Disables any payload attributes modification.
    • Responses:
      • 200: Payload attributes modification disabled successfully.

  • POST /mock/invalid/payload_attributes/{type}

    • Description: Enables specified type of payload attributes modification.
    • Parameters:
      • type (path): The type of payload attributes modification.
    • Responses:
      • 200: Payload attributes modification enabled successfully.

  • POST /mock/invalid/payload_attributes/{type}/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables specified type of payload attributes modification starting at the specified slot or epoch.
    • Parameters:
      • type (path): The type of payload attributes modification.
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling modification.
    • Responses:
      • 200: Payload attributes modification enabled successfully.

  • DELETE /mock/invalid/payload

    • Description: Disables any modification to payload built.
    • Responses:
      • 200: Payload modification disabled successfully.

  • POST /mock/invalid/payload/{type}

    • Description: Enables specified type of modification to payload built.
    • Parameters:
      • type (path): The type of payload modification.
    • Responses:
      • 200: Payload modification enabled successfully.

  • POST /mock/invalid/payload/{type}/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables specified type of modification to payload built starting at the specified slot or epoch.
    • Parameters:
      • type (path): The type of payload modification.
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling modification.
    • Responses:
      • 200: Payload modification enabled successfully.

Error Handling

The API uses standard HTTP status codes to indicate the success or failure of a request. Additional error information is provided in the response body using the following schema:

Error Schema

components:
  schemas:
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string

Builder API v3.1

Method HTTP request Description
getHeader GET /eth/v1/builder/header/{slot}/{parent_hash}/{pubkey} Get an execution payload header.
registerValidator POST /eth/v1/builder/validators Register or update a validator's block building preferences.
status GET /eth/v1/builder/status Check if builder is healthy.
submitBlindedBlock POST /eth/v1/builder/blinded_blocks Submit a signed blinded block and get unblinded execution payload.

getHeader

GetHeaderResponse getHeader(slot, parent_hash, pubkey)

Get an execution payload header.

Requests a builder node to produce a valid execution payload header, which can be integrated into a blinded beacon block and signed.  If the builder is unable to produce a valid execution payload header, then the builder MUST return a 204 response. If the request is invalid, then the builder MUST return an error response (400) with a description of the validation failure.  After Deneb, return the KZG commitments for any associated blobs attached to the execution payload.

Parameters

Name Type Description Notes
slot String The slot for which the block should be proposed. [default to null]
parent_hash String Hash of execution layer block the proposer will build on. [default to null]
pubkey String The validator's BLS public key. [default to null]

Return type

GetHeaderResponse

Properties

Name Type Description Notes
version String [default to null]
data GetHeaderResponse_data [default to null]

Authorization

No authorization required

HTTP request headers

  • Content-Type: Not defined
  • Accept: application/json

registerValidator

registerValidator(registerValidator_request_inner)

Register or update a validator's block building preferences.

Registers a validator's preferred fee recipient and gas limit.  A success response (200) indicates that the registration was valid. If the registration passes validation, then the builder MUST integrate the registration into its state, such that future blocks built for the validator conform to the preferences expressed in the registration. If the registration is invalid, then the builder MUST return an error response (400) with a description of the validation failure.

Parameters

Name Type Description Notes
registerValidator_request_inner List A signed declaration of a validator's block building preferences.

registerValidator_request_inner

Properties

Name Type Description Notes
message registerValidator_request_inner_message [default to null]
signature String [default to null]

Return type

null (empty response body)

Authorization

No authorization required

HTTP request headers

  • Content-Type: application/json
  • Accept: application/json

status

status()

Check if builder is healthy.

Checks if builder can respond to requests normally.

Parameters

This endpoint does not need any parameter.

Return type

null (empty response body)

Authorization

No authorization required

HTTP request headers

  • Content-Type: Not defined
  • Accept: application/json

submitBlindedBlock

SubmitBlindedBlockResponse submitBlindedBlock(submitBlindedBlock_request, Eth-Consensus-Version)

Submit a signed blinded block and get unblinded execution payload.

Submits a `SignedBlindedBeaconBlock` to the builder, binding the proposer to the block.  A success response (200) indicates that the signed blinded beacon block was valid. If the signed blinded beacon block was invalid, then the builder must return an error response (400) with a description of the validation failure.  After Deneb, this endpoint will additionally return the associated blobs in the response.

Parameters

Name Type Description Notes
submitBlindedBlock_request submitBlindedBlock_request A `SignedBlindedBeaconBlock`.
Eth-Consensus-Version String Version of the block being submitted [optional] [default to null] [enum: phase0, altair, bellatrix, capella, deneb, electra]

Return type

SubmitBlindedBlockResponse_data

Properties

Name Type Description Notes
parent_hash String [default to null]
fee_recipient String An address on the execution (Ethereum 1) network. [default to null]
state_root String [default to null]
receipts_root String [default to null]
logs_bloom String [default to null]
prev_randao String [default to null]
block_number String [default to null]
gas_limit String [default to null]
gas_used String [default to null]
timestamp String [default to null]
extra_data String Extra data on the execution (Ethereum 1) network. [default to null]
base_fee_per_gas String [default to null]
block_hash String [default to null]
transactions List [default to null]
withdrawals List [default to null]
execution_payload SubmitBlindedBlockResponse_data_oneOf_2_execution_payload [default to null]
blobs_bundle SubmitBlindedBlockResponse_data_oneOf_2_blobs_bundle [default to null]

Authorization

No authorization required

HTTP request headers

  • Content-Type: application/json
  • Accept: application/json

Mock Builder REST API

Introduction

This API allows Builders to enable and disable errors and modifications for various payloads. It provides endpoints to manage errors on payload requests and reveals, as well as to modify payload attributes and the payload itself.

Endpoints Summary

Method Endpoint Description
DELETE /mock/errors/payload_request Disables errors on /eth/v1/builder/header/...
POST /mock/errors/payload_request Enables errors on /eth/v1/builder/header/...
POST /mock/errors/payload_request/{slotOrEpoch}/{slotOrEpochNumber} Enables errors on /eth/v1/builder/header/... starting at the specified slot or epoch
DELETE /mock/errors/payload_reveal Disables errors on /eth/v1/builder/blinded_blocks
POST /mock/errors/payload_reveal Enables errors on /eth/v1/builder/blinded_blocks
POST /mock/errors/payload_reveal/{slotOrEpoch}/{slotOrEpochNumber} Enables errors on /eth/v1/builder/blinded_blocks starting at the specified slot or epoch
DELETE /mock/invalid/payload_attributes Disables any payload attributes modification
POST /mock/invalid/payload_attributes/{type} Enables specified type of payload attributes modification
POST /mock/invalid/payload_attributes/{type}/{slotOrEpoch}/{slotOrEpochNumber} Enables specified type of payload attributes modification starting at the specified slot or epoch
DELETE /mock/invalid/payload Disables any modification to payload built
POST /mock/invalid/payload/{type} Enables specified type of modification to payload built
POST /mock/invalid/payload/{type}/{slotOrEpoch}/{slotOrEpochNumber} Enables specified type of modification to payload built starting at the specified slot or epoch

Detailed Endpoint Documentation

Mock Error Endpoints

  • DELETE /mock/errors/payload_request

    • Description: Disables errors on /eth/v1/builder/header/....
    • Responses:
      • 200: Errors disabled successfully.

  • POST /mock/errors/payload_request

    • Description: Enables errors on /eth/v1/builder/header/....
    • Responses:
      • 200: Errors enabled successfully.

  • POST /mock/errors/payload_request/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables errors on /eth/v1/builder/header/... starting at the specified slot or epoch.
    • Parameters:
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling errors.
    • Responses:
      • 200: Errors enabled successfully.

  • DELETE /mock/errors/payload_reveal

    • Description: Disables errors on /eth/v1/builder/blinded_blocks.
    • Responses:
      • 200: Errors disabled successfully.

  • POST /mock/errors/payload_reveal

    • Description: Enables errors on /eth/v1/builder/blinded_blocks.
    • Responses:
      • 200: Errors enabled successfully.

  • POST /mock/errors/payload_reveal/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables errors on /eth/v1/builder/blinded_blocks starting at the specified slot or epoch.
    • Parameters:
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling errors.
    • Responses:
      • 200: Errors enabled successfully.

Mock Built Payloads Endpoints

  • DELETE /mock/invalid/payload_attributes

    • Description: Disables any payload attributes modification.
    • Responses:
      • 200: Payload attributes modification disabled successfully.

  • POST /mock/invalid/payload_attributes/{type}

    • Description: Enables specified type of payload attributes modification.
    • Parameters:
      • type (path): The type of payload attributes modification.
    • Responses:
      • 200: Payload attributes modification enabled successfully.

  • POST /mock/invalid/payload_attributes/{type}/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables specified type of payload attributes modification starting at the specified slot or epoch.
    • Parameters:
      • type (path): The type of payload attributes modification.
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling modification.
    • Responses:
      • 200: Payload attributes modification enabled successfully.

  • DELETE /mock/invalid/payload

    • Description: Disables any modification to payload built.
    • Responses:
      • 200: Payload modification disabled successfully.

  • POST /mock/invalid/payload/{type}

    • Description: Enables specified type of modification to payload built.
    • Parameters:
      • type (path): The type of payload modification.
    • Responses:
      • 200: Payload modification enabled successfully.

  • POST /mock/invalid/payload/{type}/{slotOrEpoch}/{slotOrEpochNumber}

    • Description: Enables specified type of modification to payload built starting at the specified slot or epoch.
    • Parameters:
      • type (path): The type of payload modification.
      • slotOrEpoch (path): Specify whether to use slot or epoch (enum: slot, epoch).
      • slotOrEpochNumber (path): The slot or epoch number to start enabling modification.
    • Responses:
      • 200: Payload modification enabled successfully.

Error Handling

The API uses standard HTTP status codes to indicate the success or failure of a request. Additional error information is provided in the response body using the following schema:

Error Schema

components:
  schemas:
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string

Builder API v3.1

Method HTTP request Description
getHeader GET /eth/v1/builder/header/{slot}/{parent_hash}/{pubkey} Get an execution payload header.
registerValidator POST /eth/v1/builder/validators Register or update a validator's block building preferences.
status GET /eth/v1/builder/status Check if builder is healthy.
submitBlindedBlock POST /eth/v1/builder/blinded_blocks Submit a signed blinded block and get unblinded execution payload.

getHeader

GetHeaderResponse getHeader(slot, parent_hash, pubkey)

Get an execution payload header.

Requests a builder node to produce a valid execution payload header, which can be integrated into a blinded beacon block and signed.  If the builder is unable to produce a valid execution payload header, then the builder MUST return a 204 response. If the request is invalid, then the builder MUST return an error response (400) with a description of the validation failure.  After Deneb, return the KZG commitments for any associated blobs attached to the execution payload.

Parameters

Name Type Description Notes
slot String The slot for which the block should be proposed. [default to null]
parent_hash String Hash of execution layer block the proposer will build on. [default to null]
pubkey String The validator's BLS public key. [default to null]

Return type

GetHeaderResponse

Properties

Name Type Description Notes
version String [default to null]
data GetHeaderResponse_data [default to null]

Authorization

No authorization required

HTTP request headers

  • Content-Type: Not defined
  • Accept: application/json

registerValidator

registerValidator(registerValidator_request_inner)

Register or update a validator's block building preferences.

Registers a validator's preferred fee recipient and gas limit.  A success response (200) indicates that the registration was valid. If the registration passes validation, then the builder MUST integrate the registration into its state, such that future blocks built for the validator conform to the preferences expressed in the registration. If the registration is invalid, then the builder MUST return an error response (400) with a description of the validation failure.

Parameters

Name Type Description Notes
registerValidator_request_inner List A signed declaration of a validator's block building preferences.

registerValidator_request_inner

Properties

Name Type Description Notes
message registerValidator_request_inner_message [default to null]
signature String [default to null]

Return type

null (empty response body)

Authorization

No authorization required

HTTP request headers

  • Content-Type: application/json
  • Accept: application/json

status

status()

Check if builder is healthy.

Checks if builder can respond to requests normally.

Parameters

This endpoint does not need any parameter.

Return type

null (empty response body)

Authorization

No authorization required

HTTP request headers

  • Content-Type: Not defined
  • Accept: application/json

submitBlindedBlock

SubmitBlindedBlockResponse submitBlindedBlock(submitBlindedBlock_request, Eth-Consensus-Version)

Submit a signed blinded block and get unblinded execution payload.

Submits a `SignedBlindedBeaconBlock` to the builder, binding the proposer to the block.  A success response (200) indicates that the signed blinded beacon block was valid. If the signed blinded beacon block was invalid, then the builder must return an error response (400) with a description of the validation failure.  After Deneb, this endpoint will additionally return the associated blobs in the response.

Parameters

Name Type Description Notes
submitBlindedBlock_request submitBlindedBlock_request A `SignedBlindedBeaconBlock`.
Eth-Consensus-Version String Version of the block being submitted [optional] [default to null] [enum: phase0, altair, bellatrix, capella, deneb, electra]

Return type

SubmitBlindedBlockResponse_data

Properties

Name Type Description Notes
parent_hash String [default to null]
fee_recipient String An address on the execution (Ethereum 1) network. [default to null]
state_root String [default to null]
receipts_root String [default to null]
logs_bloom String [default to null]
prev_randao String [default to null]
block_number String [default to null]
gas_limit String [default to null]
gas_used String [default to null]
timestamp String [default to null]
extra_data String Extra data on the execution (Ethereum 1) network. [default to null]
base_fee_per_gas String [default to null]
block_hash String [default to null]
transactions List [default to null]
withdrawals List [default to null]
execution_payload SubmitBlindedBlockResponse_data_oneOf_2_execution_payload [default to null]
blobs_bundle SubmitBlindedBlockResponse_data_oneOf_2_blobs_bundle [default to null]

Authorization

No authorization required

HTTP request headers

  • Content-Type: application/json
  • Accept: application/json

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