Create Signing Request

Endpoint

rpc CreateSigningRequest(CreateSigningRequestRequest) returns (CreateSigningRequestResponse)

Messages are in mpcvault.platform.v1. Set exactly one supported transaction or message member of type; the REST schema shows all accepted members and nested fields. Network guides provide payload examples; gRPC uses the corresponding snake_case field names and raw bytes. The creation payload set is narrower than the queryable SigningRequest payload set. Existing swap, batch-payment, fiat, account-setup, management, Stellar message/authorization/challenge and Aptos whole-transaction requests cannot be created with this RPC.

Request

Field	Type	Required	Description
`type`	oneof	Yes	One supported transaction or message payload, including Solana/Sonic SVM and Stellar transaction members.
`notes`	google.protobuf.StringValue	No	Transaction notes.
`vault_uuid`	google.protobuf.StringValue	Depends on signing mode	Required when the callback ClientSigner key is set. For App signing it is optional or ignored according to the payload; see the REST field rules.
`callback_client_signer_public_key`	google.protobuf.StringValue	Depends on wallet	Selects the callback ClientSigner. Omit for manual App signing; API wallets require a ClientSigner.
`broadcast_tx`	google.protobuf.BoolValue	No	Enables automatic broadcasting for supported standard transactions. Unsupported for messages, RawMessage and custom EVM networks.

Omit callback_client_signer_public_key for manual App signing. A present wrapper containing an empty string selects the ClientSigner path and is rejected; it does not select App signing. Output-only objects such as message network, Solana jito and EVM batch batch_contract_address cannot select creation parameters.

Response

Field	Type	Description
`signing_request`	SigningRequest	Created request with its shared payload; detail-only fields are unavailable here.
`error`	Error	Error information when returned.

Use Get Signing Request Details for inspection and approval progress. See Introduction for signing and confirmation.

Getting Started

Wallets

Signing Requests

Batch Payments

Deposit & Sweep

TRON Watch Address

Create Signing Request

Endpoint

Request

Response