Paymaster (Gasless Transactions)

LearnWay operates an ERC-7677 compliant Paymaster service enabling gasless transactions for user smart accounts (e.g. minting NFT certificates, claiming rewards, or transferring USDT).

Accepts an unsigned or partial ERC-4337 v0.7 UserOperation, validates it against gas policies and rate limits, and returns signed paymaster data (paymasterAndData).

Endpoint

POST /paymaster/rpc/:chainId

Path Parameters

Parameter	Type	Required	Description
`chainId`	`number`	Yes	Target EVM Chain ID (`1135` for Lisk Mainnet, `4202` for Lisk Sepolia)

Request Body (JSON-RPC 2.0)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "pm_sponsorUserOperation",
  "params": [
    {
      "sender": "0xYourSmartAccountAddress",
      "nonce": "0x1",
      "callData": "0xb61d27f6...",
      "callGasLimit": "0x186a0",
      "verificationGasLimit": "0x186a0",
      "preVerificationGas": "0xc350",
      "maxFeePerGas": "0x3b9aca00",
      "maxPriorityFeePerGas": "0x3b9aca00"
    },
    {
      "entryPoint": "0x0000000071727De22E5E9d8BAf0edAc6f37da032"
    }
  ]
}

Response (200 OK)

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "paymaster": "0x1234567890123456789012345678901234567890",
    "paymasterData": "0x018239...",
    "paymasterVerificationGasLimit": "0x186a0",
    "paymasterPostOpGasLimit": "0x0"
  }
}

Sponsorship Policies & Whitelists

Target Whitelist: Only calls targeting verified LearnWay contracts (Badges NFT, Certificates NFT, and approved token transfers) are sponsored.
Rate Limits: Users are allocated a daily gas allowance refreshed every 24 hours.

Submitting to the Alto Bundler (`/alto`)

After receiving the signed paymasterAndData payload from this endpoint:

Attach the returned fields to your client’s UserOperation.
Dispatch the completed UserOp via standard eth_sendUserOperation JSON-RPC to the hosted Alto Bundler (/alto).
The Alto bundler handles bundle simulation, batching, and on-chain submission to the EntryPoint contract on Lisk L2.

​Paymaster (Gasless Transactions)

​Sponsor User Operation (pm_sponsorUserOperation)

​Endpoint

​Path Parameters

​Request Body (JSON-RPC 2.0)

​Response (200 OK)

​Sponsorship Policies & Whitelists

​Submitting to the Alto Bundler (/alto)