Transaction Builder API
Sign and submit
Attach a witness and submit in one call
POST
Attaches the provided witness to a transaction and submits it to the Cardano network in a single round-trip. Use this endpoint when you want signing and submission handled in one call.
Use
Possible errors:
/sign if you want the signed CBOR back without submission, or /submit if the transaction is already fully signed.
Auth: Public
Request body
string
required
Hex-encoded unsigned transaction CBOR.
string
required
Hex-encoded transaction witness-set CBOR.
string
required
Bech32 change address.
Response
string
Hash of the submitted transaction.
Error response
string
Machine-readable error code.
string
Human-readable error message.
400 INVALID_PARAMS— one or more required fields are missing or have the wrong type.500 SERVER_ERROR— the transaction CBOR or witness CBOR could not be processed, or relay submission failed.