chit402-sdk

OpenAI-compatible TypeScript client for Chit402 — receipted AI inference with USDC settlement on Base.

npm: chit402-sdk · License: Apache-2.0
Docs: https://chit402.com · API: https://api.chit402.com

Public beta. Payments are real USDC on Base mainnet via x402. Do not point a real wallet at it unless you mean to pay.

Install

npm install chit402-sdk

Quick Start

import { Chit402Client } from 'chit402-sdk';

const client = new Chit402Client();

const chat = await client.chatCompletions({
  model: 'chit402/auto',
  messages: [{ role: 'user', content: 'Say hello in five words.' }],
});

console.log(chat.choices[0].message.content);
console.log(chat.xfuel?.verify_url); // signed receipt

First Hour — No Wallet

The free path is /v1 chat completions. Use any OpenAI-compatible client with baseURL: 'https://api.chit402.com/v1', or the Chit402Client above.

The demo key chit402-demo is rate-limited — bring your own key for higher limits.

Paid USDC

submitInference / submitTaskWithPayment hit the paid rail via x402. Without a real payer, the host returns 402.

import { Chit402Client, createSignerPayer } from 'chit402-sdk';
import { Wallet } from 'ethers';

const wallet = new Wallet(process.env.PRIVATE_KEY);
const payer = createSignerPayer(wallet);
const client = new Chit402Client({ apiKey: process.env.CHIT402_API_KEY });

const result = await client.submitTaskWithPayment(
  { /* task params */ },
  payer,
);

On-chain Helpers

import { verifyProof } from 'chit402-sdk/onchain';

Requires ethers peer dependency.

Documentation

• Chit402 Docs
• API Reference

License

Apache-2.0