# @three-ws/x402-preflight

> Ask an x402 seller whether it can actually settle, before you sign anything. Fetches and verifies a signed, time-bounded payability attestation, then routes you to a rail that works. The missing reliability layer for agent payments.

@three-ws/x402-preflight is a JavaScript library from three.ws. Install: `npx -y @three-ws/x402-preflight`.

## Docs

- [README](https://github.com/nirholas/x402-preflight/blob/main/README.md): install, configuration, full reference
- [Documentation site](https://nirholas.github.io/x402-preflight/): the README as a web page
- [Full text for LLMs](https://nirholas.github.io/x402-preflight/llms-full.txt): README inlined
- [AGENTS.md](https://github.com/nirholas/x402-preflight/blob/main/AGENTS.md): guidance for coding agents

## Project

- [Source](https://github.com/nirholas/x402-preflight)
- [npm](https://www.npmjs.com/package/@three-ws/x402-preflight)
- [three.ws](https://three.ws): the platform this is part of
- [Issues](https://github.com/nirholas/x402-preflight/issues)