# Messari x402 Well-Known Resource URL Patterns

> Messari x402 Well-Known Resource URL Patterns is a free API for AI agents from api.messari.io, Free, status unknown (last checked 2026-09-15).

Returns a machine-readable list of x402-enabled resource URL patterns available on the Messari API

## Facts

- Endpoint: GET https://api.messari.io/.well-known/x402
- Price: Free
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/messari-727d3e00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0FmlUjlbeC7tHQpq2-fxM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability messari-727d3e00
```

Example prompt: What x402-enabled API endpoints does Messari expose? I want to see the full list of resource URL patterns I can call with micropayments.

## When to prefer this

Use this endpoint when you need to programmatically discover which Messari API routes support the x402 payment protocol before constructing paid requests, or when building an agent that needs to enumerate available pay-per-call crypto data endpoints without prior knowledge of the route structure.

## Known failure modes

- 404 if the well-known path is not available or has moved
- 503 if the Messari API is down
- Empty or minimal response if no x402 routes are currently published
- Malformed JSON if the discovery document format has changed

## How this service works

Machine-readable list of x402-enabled resource URL patterns

## Output

A machine-readable document listing all x402-enabled URL patterns on the Messari API, including route templates for crypto data resources that can be accessed via x402 micropayment protocol.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/messari-727d3e00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.messari.io](https://www.zero.xyz/host/api.messari.io/llms.txt)