# ATMS Treasury x402 Challenge Probe

> ATMS Treasury x402 Challenge Probe is a paid API for AI agents from api.atms.nathanlidurin.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns a 402 Payment Required challenge response for testing x402 payment protocol flow; a crawler/probe endpoint with no functional side effects

## Facts

- Endpoint: GET https://api.atms.nathanlidurin.com/x402/challenge
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/atms-treasury-x402-challenge-probe-48646fc6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sJAEbprnTgVe-X0RA3E-j

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 atms-treasury-x402-challenge-probe-48646fc6
```

Example prompt: Ping the ATMS Treasury x402 challenge endpoint with a GET request to trigger a 402 payment-required response and show me the challenge payload it returns.

## When to prefer this

Use this endpoint when you need to test or verify the x402 payment protocol challenge/response flow, confirm that a 402-gated endpoint is alive and returning valid challenge metadata, or crawl/probe x402-enabled APIs. This is not suitable for performing actual transactions or retrieving treasury data — it is purely a probe endpoint.

## Known failure modes

- Always returns 402 by design — not an error, but the intended response
- Network timeout if the host is unreachable
- Unexpected 5xx if the server is misconfigured
- No useful data payload beyond the challenge structure

## How this service works

ATMS x402 challenge — crawler / probe endpoint (always 402, no side effects)

## Output

A 402 Payment Required HTTP response containing an x402 challenge payload — typically including payment details, USDC amount, and challenge metadata needed to complete the payment flow. No resource is created or modified.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/atms-treasury-x402-challenge-probe-48646fc6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.atms.nathanlidurin.com](https://www.zero.xyz/host/api.atms.nathanlidurin.com/llms.txt)