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POST
/
curl -X POST "https://starknet.paymaster.avnu.fi" \
  -H "Content-Type: application/json" \
  -H "x-paymaster-api-key: $PAYMASTER_API_KEY" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "paymaster_executeTransaction",
    "params": {
      "transaction": {
        "type": "apply_action",
        "apply_action": {
          "apply_actions_call": { "to": "0x04c9...pool", "selector": "0x02ac...", "calldata": ["0x1", "0x2"] },
          "proof": "base64-encoded-proof",
          "proof_facts": ["0x0123...", "0x0456..."]
        }
      },
      "parameters": {
        "version": "0x1",
        "fee_mode": {
          "mode": "sponsored_private",
          "pool_fee_token": "0x04718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
          "tip": "normal"
        }
      }
    }
  }'

import { submitPrivateSwap } from '@avnu/avnu-sdk';

const { transactionHash } = await submitPrivateSwap({
  callAndProof, // { call, proof } from the proving backend
  feeMode: { poolFeeToken: STRK, tip: 'normal' },
  paymasterApiKey: PAYMASTER_API_KEY,
});

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "transaction_hash": "0x06f8...hash",
    "tracking_id": "0x0"
  }
}

​
Overview

JSON-RPC method paymaster_executeTransaction with the apply_action type. The relayer submits the proven call on-chain and pays the gas; the pool fee (from the build step) reimburses it. No user signature is needed: the transaction settles straight from the proof. Use invoke_and_apply_action to also wrap a signed user call (with the typed_data returned by the build step). The endpoint is the base URL itself (no path): https://starknet.paymaster.avnu.fi (mainnet) or https://sepolia.paymaster.avnu.fi (testnet).

​
Headers

​
x-paymaster-api-key
string
required
Portal API key. Required for the sponsored fee modes (sponsored, sponsored_private)

​
Body (JSON-RPC 2.0)

​
method
string
required
paymaster_executeTransaction
​
params.transaction.type
string
required
apply_action, or invoke_and_apply_action when a signed user call is wrapped
​
params.transaction.apply_action.apply_actions_call
object
required
The proven call, as { to, selector, calldata }
​
params.transaction.apply_action.proof
string
required
The zero-knowledge proof produced by the proving backend
​
params.transaction.apply_action.proof_facts
array
required
The proof facts (array of felt hex strings)
​
params.transaction.invoke
object
Only for invoke_and_apply_action: { user_address, typed_data, signature }
​
params.parameters
object
required
Same shape as the build step: { version: '0x1', fee_mode, time_bounds? }

​
Response

​
transaction_hash
string
required
The hash of the submitted transaction
​
tracking_id
string
Relayer tracking id

​
Errors

CodeNameWhen
156TRANSACTION_EXECUTION_ERROROn-chain execution failure
159PRIVACY_REQUIRES_SPONSORINGPrivate transaction sent without a sponsored fee mode
163UNKNOWN_ERRORInvalid API key, service unavailable, or blacklisted call
165MISSING_FEE_TRANSFER_TOThe private transaction calldata does not withdraw the pool fee to the paymaster
166CALLDATA_PARSINGThe private transaction calldata could not be parsed
167POOL_FEE_TOO_LOWThe withdrawn pool fee is below the required amount
168PRIVACY_PROOF_MISSINGThe proof is missing on a private transaction
169MAX_L2_GAS_AMOUNT_EXCEEDEDThe transaction exceeds the maximum L2 gas
curl -X POST "https://starknet.paymaster.avnu.fi" \
  -H "Content-Type: application/json" \
  -H "x-paymaster-api-key: $PAYMASTER_API_KEY" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "paymaster_executeTransaction",
    "params": {
      "transaction": {
        "type": "apply_action",
        "apply_action": {
          "apply_actions_call": { "to": "0x04c9...pool", "selector": "0x02ac...", "calldata": ["0x1", "0x2"] },
          "proof": "base64-encoded-proof",
          "proof_facts": ["0x0123...", "0x0456..."]
        }
      },
      "parameters": {
        "version": "0x1",
        "fee_mode": {
          "mode": "sponsored_private",
          "pool_fee_token": "0x04718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
          "tip": "normal"
        }
      }
    }
  }'

import { submitPrivateSwap } from '@avnu/avnu-sdk';

const { transactionHash } = await submitPrivateSwap({
  callAndProof, // { call, proof } from the proving backend
  feeMode: { poolFeeToken: STRK, tip: 'normal' },
  paymasterApiKey: PAYMASTER_API_KEY,
});

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "transaction_hash": "0x06f8...hash",
    "tracking_id": "0x0"
  }
}