CrossmintApiKeySigner

Flutter Final Class

Final Class

A signer that delegates all signing to the Crossmint backend via API key authentication.

final class CrossmintApiKeySigner implements CrossmintWalletApprovalSigner

This signer never performs local signing. When a wallet uses an API key signer, the Crossmint backend automatically approves transactions and signatures on behalf of the user.

Calling signMessage or signTransaction directly will throw; signing is handled server-side during the transaction/signature creation API call.

Constructors

CrossmintApiKeySigner

const CrossmintApiKeySigner({String? locator})

Creates an API key signer.

Properties

type

String get type

locator

final String locator

Methods

signMessage

Future<Object> signMessage(String message)

Always throws — API key signers do not support local message signing.

signTransaction

Future<Object> signTransaction(String transaction)

Always throws — API key signers do not support local transaction signing.