# Ritmex x402 v2 Test Endpoint

> Ritmex x402 v2 Test Endpoint is a paid API for AI agents from www.ritmex.one, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

A test endpoint implementing the x402 payment protocol v2, requiring a micropayment of 1000 USDC on Base (eip155:8453) to process a request.

## Facts

- Endpoint: POST https://www.ritmex.one/x402/test
- 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/www-ritmex-one-59bd0cf9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aeW4-oA0Zmxtq0Qt70UyL

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 www-ritmex-one-59bd0cf9 -d '<json body>'
```

Example prompt: Run the x402 v2 test endpoint at ritmex.one to verify my payment integration is working — I need to confirm that sending 1000 USDC units on the Base chain (eip155:8453) goes through correctly.

## When to prefer this

Use this endpoint when you need to test or validate an x402 v2 micropayment integration against a live endpoint on the Base network using USDC. Ideal for developers verifying their x402 client implementation, checking payment header construction, or confirming that USDC payments on eip155:8453 are flowing correctly end-to-end. Not suitable for production workloads — strictly a test/probe endpoint.

## Known failure modes

- Payment amount mismatch — sending anything other than exactly 1000 USDC units results in rejection
- Wrong chain — payment on a chain other than eip155:8453 (Base) will fail
- Insufficient USDC balance — transaction fails if wallet lacks funds
- Malformed x402 payment header — missing or invalid payment proof
- Network congestion on Base causing transaction delays or timeouts

## How this service works

Access the x402 v2 test endpoint; requires an exact payment of 1000 USD Coin (USDC) on eip155:8453.

## Output

Returns an x402 v2 protocol test response confirming that the payment of 1000 USDC units on Base was received and processed, validating the end-to-end payment flow.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/www-ritmex-one-59bd0cf9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.ritmex.one](https://www.zero.xyz/host/www.ritmex.one/llms.txt)