Blockdaemon Send API

openapi: 3.2.0
info:
  title: Transaction Send API
  version: 1.0.0
  description: Blockdaemon transaction API to create, compile, send and verify transactions for supported blockchains.
  contact:
    name: Blockdaemon
    email: info@blockdaemon.com
    url: https://blockdaemon.com
  x-logo:
    url: https://storage.googleapis.com/blockdaemon-app-static-images/marketing/PNG/dark-logo.png
    altText: Blockdaemon logo
servers:
- url: https://svc.blockdaemon.com/tx/v1
  description: Blockdaemon transaction API
security:
- apiKeyAuthHeader: []
- bearerAuth: []
tags:
- name: Send
paths:
  /{blockchain_id}/send:
    parameters:
    - $ref: '#/components/parameters/blockchain_id'
    post:
      summary: Submit a Signed Transaction
      description: 'Submit a signed transaction to the network.


        **Note**: A successful transaction may still be rejected on chain or not processed due to a too low fee.'
      operationId: TxSend
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ApiTxSigned'
      responses:
        '200':
          description: A submitted Transaction ID
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiTxSendResponse'
              example:
                id: 9c8ac345b443dd10a418ea0beaa320ef233dbae5590be2a11ac090e0e9839c1c
        '401':
          $ref: '#/components/responses/ErrorUnauthorized'
        '429':
          $ref: '#/components/responses/ErrorTooManyRequests'
        '500':
          $ref: '#/components/responses/ErrorInternal'
        '501':
          $ref: '#/components/responses/ErrorNotImplemented'
        '503':
          $ref: '#/components/responses/ErrorServiceUnavailable'
      tags:
      - Send
components:
  schemas:
    error:
      type: object
      properties:
        type:
          type: string
          description: The HTTP error type.
          example: bad-request
        code:
          type: integer
          description: The numeric error code.
          example: 16384
        title:
          type: string
          description: The short error description.
          example: Invalid Address
        status:
          type: integer
          description: The HTTP status of the error.
          example: 400
        detail:
          type: string
          description: Long error description
          example: The requested address is invalid on this protocol.
    ApiTxSendResponse:
      type: object
      properties:
        id:
          type: string
          description: The transaction ID.
          example: '0x9c8ac345b443dd10a418ea0beaa320ef233dbae5590be2a11ac090e0e9839c1c'
      required:
      - id
    ApiTxSigned:
      type: object
      properties:
        tx:
          type: string
          description: The signed TX.
          example: 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
          x-oapi-codegen-extra-tags:
            validate: required
      required:
      - tx
  parameters:
    blockchain_id:
      name: blockchain_id
      in: path
      required: true
      description: Either a hyphen seperated protocol-network pair like `ethereum-mainnet` or the `chain-id`
      schema:
        type: string
        default: ethereum-mainnet
  responses:
    ErrorTooManyRequests:
      description: Rate limit exceeded
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/error'
          example:
            type: too-many-requests
            title: Too Many Requests
            status: 429
            detail: Request rate limits have been exceeded. Try again after a few seconds.
    ErrorNotImplemented:
      description: The request endpoint is not implemented
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/error'
          example:
            type: not-implemented
            title: Not implemented
            status: 501
    ErrorUnauthorized:
      description: Invalid or expired token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/error'
          example:
            type: unauthorized
            title: Invalid Token
            status: 401
    ErrorInternal:
      description: An internal server error happened
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/error'
          example:
            type: internal-server-error
            title: Internal Server Error
            status: 500
    ErrorServiceUnavailable:
      description: The resource you are trying to access is currently unavailable
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/error'
          example:
            type: unavailable
            title: Unavailable
            status: 503
  securitySchemes:
    apiKeyAuthHeader:
      type: apiKey
      in: header
      name: X-API-Key
      description: 'Unlock higher TPS - Create your own API key in the [Blockdaemon App](https://app.blockdaemon.com).

        '
      x-default: 2go1YqUcuAr4WZ2-3WgSD3c7qpatZqQuNWhTVBldKZnTSUtw
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: Opaque
      description: '[Legacy Auth] Unlock higher TPS - Create your own API key in the [Blockdaemon App](https://app.blockdaemon.com).

        '
      x-default: 2go1YqUcuAr4WZ2-3WgSD3c7qpatZqQuNWhTVBldKZnTSUtw
x-provenance:
  method: searched
  source: https://docs.blockdaemon.com/reference
  harvested: '2026-10-14'
  tool: harvest-readme-openapi.py
  note: Assembled verbatim from the OpenAPI definition ReadMe embeds in each operation page of the provider's developer portal; paths and components merged by API title, nothing authored.
  assembled_from:
  - https://docs.blockdaemon.com/reference/getoverview-txapi.md
  - https://docs.blockdaemon.com/reference/txcompile-txapi.md
  - https://docs.blockdaemon.com/reference/txcompileandsend-txapi.md
  - https://docs.blockdaemon.com/reference/txcreate-txapi.md
  - https://docs.blockdaemon.com/reference/txcreatetoken-txapi.md
  - https://docs.blockdaemon.com/reference/txdecode-txapi.md
  - https://docs.blockdaemon.com/reference/txderivesigningpayload.md
  - https://docs.blockdaemon.com/reference/txestimatefee-txapi.md
  - https://docs.blockdaemon.com/reference/txsend-txapi.md
  - https://docs.blockdaemon.com/reference/txverify-txapi.md
  merge:
    pages: 10
    deduped: 119
    conflicts_kept_first: 0