JSON-RPC API Overview

Standard: JSON-RPC 2.0
Transport: HTTP POST
Content-Type: application/json
Endpoint: http://your-kora-instance/

Kora implements a JSON-RPC 2.0 interface for gasless transaction processing on Solana.

Protocol

Method	Description
estimateTransactionFee	Estimates the transaction fee in both lamports and the specified token.
getBlockhash	Gets the latest blockhash from the Solana RPC that the Kora server is connected to.
getConfig	Retrieves the current Kora server configuration.
getPayerSigner	Retrieves the payer signer and payment destination from the Kora server.
getPaymentInstruction	Creates a payment instruction to append to a transaction for fee payment to the Kora paymaster.
getSupportedTokens	Retrieves the list of tokens supported for fee payment.
signAndSendTransaction	Signs a transaction and immediately broadcasts it to the Solana network.
signTransaction	Signs a transaction with the Kora fee payer if the transaction includes necessary payment to the fee payer without broadcasting it.
transferTransaction	Creates a token transfer transaction with Kora as the fee payer.

All requests follow the JSON-RPC 2.0 standard:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "methodName",
  "params": {}
}

Successful responses:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {}
}

Error responses:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32600,
    "message": "Invalid request"
  }
}