--- updatedAt: 2026-05-20T16:41:59.000Z --- Fetch the complete documentation index at: https://docs.blockdaemon.com/llms.txt. Use this file to discover all available pages before exploring further. Append .md to any documentation page URL to get its markdown version. # Submit a Signed Transaction 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. ### **Compute Unit Value**: `10` (fixed) *** > 👍 START HERE! > > Click **Try It!** to test the endpoint with the default values or customize your request by following these steps: > > 1. Enter your API key in the **Header: token** text box (top right). > * You can **[get a free API key here](https://docs.blockdaemon.com/docs/quick-start-blockdaemon-api-suite)** . > 2. Enter the parameters available below. > 3. Click **Try It!**. *** {`

Supported Protocols & Networks

Protocol Network Path Parameter
Avalanche Mainnet-c avalanche-mainnet-c
Testnet-c avalanche-testnet-c
Bitcoin Mainnet bitcoin-mainnet
Testnet bitcoin-testnet
Testnet4 bitcoin-testnet4
Bitcoincash Mainnet bitcoincash-mainnet
Testnet bitcoincash-testnet
Cosmos Mainnet cosmos-mainnet
Ethereum Mainnet ethereum-mainnet
Sepolia ethereum-sepolia
Hoodi ethereum-hoodi
Litecoin Mainnet litecoin-mainnet
Testnet litecoin-testnet
Near Mainnet near-mainnet
Testnet near-testnet
Polkadot Mainnet polkadot-mainnet
Westend polkadot-westend
Assethub Mainnet polkadot-assethub-mainnet
Assethub Westend polkadot-assethub-westend
Polygon Mainnet polygon-mainnet
Amoy polygon-amoy
Solana Mainnet solana-mainnet
Testnet solana-testnet
Devnet solana-devnet
Stellar Mainnet stellar-mainnet
Testnet stellar-testnet
Tron Mainnet tron-mainnet
Nile tron-nile
`} # OpenAPI definition ```json { "openapi": "3.0.3", "info": { "title": "Transaction 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": [] } ], "paths": { "/{blockchain_id}/send": { "parameters": [ { "$ref": "#/components/parameters/blockchain_id" } ], "post": { "summary": "Submit a Signed Transaction", "description": "Submit a signed transaction to the network.\n\n**Note**: A successful transaction may still be rejected on chain or not processed due to a too low fee.\n", "operationId": "TxSend", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$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" } } } } }, "components": { "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).\n", "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).\n", "x-default": "2go1YqUcuAr4WZ2-3WgSD3c7qpatZqQuNWhTVBldKZnTSUtw" } }, "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": { "$ref": "#/components/schemas/error" }, "example": { "type": "too-many-requests", "title": "Too Many Requests", "status": 429, "detail": "Request rate limits have been exceeded. Try again after a few seconds." } } } }, "ErrorUnauthorized": { "description": "Invalid or expired token", "content": { "application/json": { "schema": { "$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 } } } }, "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 } } } } }, "schemas": { "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" ] }, "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." } } } } } } ```