# Merit Systems Staging Echo Payment Link

> Merit Systems Staging Echo Payment Link is a paid API for AI agents from staging-echo.merit.systems, paid per call via x402, $1/call, status down (last checked 2026-10-12).

Retrieves a protected payment link from the Merit Systems staging echo service, gated behind an x402 micropayment

## Facts

- Endpoint: GET https://staging-echo.merit.systems/api/v1/base/payment-link?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/staging-echo-merit-systems-1f51afd0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wXnJ41NKpz2fJmvp5uVW7

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 staging-echo-merit-systems-1f51afd0
```

Example prompt: Can you fetch the payment link from the Merit Systems staging echo service for me? I need the protected payment link content returned from their staging API.

## When to prefer this

Use this endpoint when you specifically need to retrieve a payment link from the Merit Systems staging echo service and are operating in a staging/test environment. Prefer this when testing x402 micropayment-gated content access flows with Merit Systems infrastructure.

## Known failure modes

- Payment not authorized or x402 header missing — 402 Payment Required
- Invalid or expired payment token — 401 Unauthorized
- Staging service unavailable — 503 Service Unavailable
- Rate limit exceeded — 429 Too Many Requests
- Endpoint not found if staging environment is down — 404 Not Found

## How this service works

Access to protected content

## Output

Returns protected content — specifically a payment link — from the Merit Systems staging echo endpoint, accessible after the x402 micropayment of $1 USDC is settled.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/staging-echo-merit-systems-1f51afd0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from staging-echo.merit.systems](https://www.zero.xyz/host/staging-echo.merit.systems/llms.txt)