# Oblique Markets Echo Service

> Oblique Markets Echo Service is a paid API for AI agents from api.oblique.markets, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns an echoed response to confirm API connectivity and validate that x402 payment-gated requests are working correctly

## Facts

- Endpoint: GET https://api.oblique.markets/api/v1/paid/echo
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/oblique-markets-echo-service-61a2e549
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kvlwqXKrB0Llue5WsqFEk

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 oblique-markets-echo-service-61a2e549
```

Example prompt: Send a quick test GET request to the Oblique Markets echo endpoint to confirm that x402 payment processing is working and the API gateway is responding correctly.

## When to prefer this

Choose this endpoint when you need to verify that x402 micropayment infrastructure is working, test API connectivity before making more expensive calls, or debug payment and authentication issues with the Oblique Markets platform. Not suitable for any real data retrieval or processing task.

## Known failure modes

- Payment failure if USDC balance is insufficient — 402 Payment Required
- Invalid HTTP method (only GET, HEAD, DELETE are accepted) — validation error
- Missing required 'input' object in request body — schema validation failure
- Network timeout if API gateway is unreachable
- Malformed query parameters may be rejected or silently ignored

## How this service works

Use when an agent is checking that its x402 payment headers and query encoding survive a paid round trip. Returns The query parameters you sent, echoed back with a server timestamp. $0.01.

## Output

Returns an echoed confirmation of the incoming request details, including the method and any query parameters supplied, confirming that the x402 payment was processed and the API gateway is reachable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "echo": {
   "n": "1",
   "hello": "world"
  },
  "message": "This response was paid for via x402 protocol",
  "timestamp": "2026-09-12T00:08:59.286Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/oblique-markets-echo-service-61a2e549/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.oblique.markets](https://www.zero.xyz/host/api.oblique.markets/llms.txt)