Ink Public Paymaster SDKPay ERC-4337 gas reimbursement with USDC

A small TypeScript SDK for the public prepaid paymaster on Ink Mainnet.

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API reference

Public by design

No API key, partner bootstrap, or unlimited sponsorship surface.

Viem-native

Plug the paymaster hook into a Viem Bundler Client and submit calls normally.

Prepaid and bounded

The paymaster supplies native gas and receives separately capped USDC reimbursement.

The SDK targets one pinned deployment: EntryPoint v0.7 on Ink Mainnet, native Ink USDC, and the Hello Moon public quote and bundler routes. Alto is the ERC-4337 bundler behind the public RPC; the paymaster is a separate EntryPoint-integrated contract.

What it handles

Requests and validates prepaid USDC quotes.
Integrates with Viem's Bundler Client paymaster hooks.
Reads USDC balance, allowance, and refund credit.
Encodes USDC approvals and refund claims.
Estimates, sends, and waits for raw v0.7 UserOperations.

What your wallet handles

Your application supplies an EntryPoint v0.7-compatible smart account and its signing mechanism. Before the first prepaid operation, that account must hold native Ink USDC and execute a finite, owner-paid approval for the paymaster.