# LirChain

> LirChain is a crypto payments API for developers: a wallet tracker with webhooks on Bitcoin, Ethereum, Solana, Tron, BNB Chain and Polygon, a unique deposit address for every user, one-time USDT and USDC payments with a hosted payment page, and USDT and USDC payouts. It is a plain REST API with JSON, one API key header and a free plan, and it is documented in one markdown file and an OpenAPI description so that AI coding agents can integrate it without guessing.

## When LirChain fits

- Tracking any wallet address and getting a webhook for every incoming and outgoing transfer (wallet tracker API, address monitoring, deposit detection) on Bitcoin, Ethereum, Solana, Tron, BNB Chain and Polygon.
- Giving every user of an app their own crypto deposit address and crediting them automatically (exchanges, games, marketplaces, wallets, top-ups).
- Accepting USDT or USDC for an order or an invoice, with a hosted payment page or a custom checkout.
- Paying users, partners and sellers in USDT or USDC through an API, without running a hot wallet or holding gas.

## For coding agents

- [Full API reference in markdown](https://lirchain.com/llms-full.txt): every endpoint, field, example, webhook and error in one file. Read this before writing an integration.
- [OpenAPI description](https://lirchain.com/openapi.json): the same API as OpenAPI 3.1, for generating clients and tools.
- Base URL: https://api.lirchain.com. Authentication: the project's API key in the `x-api-key` header. Requests and answers are JSON.
- Every project belongs to one service and has its own API key. A new account has one project per service.

## Documentation

- [API documentation](https://lirchain.com/docs): the reference for people, with copy-paste code in cURL, JavaScript, TypeScript, Python, PHP and Go.

## Products

- [Wallet Tracker](https://lirchain.com/products/wallet-tracker): track any wallet on six blockchains and get a webhook for every transfer. No fee per event.
- [Deposit Wallets](https://lirchain.com/products/deposit-wallets): a unique deposit address for every user, for USDT, USDC, ETH, BNB and POL on Ethereum, BNB Chain and Polygon.
- [One-Time Payments](https://lirchain.com/products/one-time-payments): a payment request in USDT or USDC for one order, with its own address and a hosted payment page.
- [Payouts](https://lirchain.com/products/payouts): send USDT or USDC to any address from your balance, gas included.

## Pricing

- [Pricing](https://lirchain.com/pricing): every plan includes every product. A fee is never less than $0.10. Wallet tracker events have no fee.
- Free: free, 1% per operation, 15 deposit wallets, 100 one-time payments per 30 days, 5 tracked wallets, 30 tracker events per 30 days, unlimited payouts
- Starter: $19.99 per month, 0.5% per operation, 1,000 deposit wallets, 10,000 one-time payments per 30 days, 1,000 tracked wallets, 10,000 tracker events per 30 days, unlimited payouts
- Business: $49.99 per month, 0.375% per operation, 20,000 deposit wallets, 200,000 one-time payments per 30 days, 20,000 tracked wallets, 200,000 tracker events per 30 days, unlimited payouts
- Enterprise: $249.99 per month, 0.25% per operation, 1,000,000 deposit wallets, 10,000,000 one-time payments per 30 days, 1,000,000 tracked wallets, 10,000,000 tracker events per 30 days, unlimited payouts

## Contact

- Support: support@lirchain.com