# x402-market-api Test Echo CDP High Price

> x402-market-api Test Echo CDP High Price is a paid API for AI agents from x402-market-api.lien-studio-akiyama.workers.dev, paid per call via x402, $0.100000/call, status unknown (last checked 2026-09-15).

Echoes an HTTP POST/PUT/PATCH request body back to the caller, priced at 0.10 USDC, used to test x402 payment protocol behavior at higher price points

## Facts

- Endpoint: POST https://x402-market-api.lien-studio-akiyama.workers.dev/api/seller-4068b8fc/test-echo-cdp-high
- Price: $0.100000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-market-api-test-echo-cdp-high-price-61b0cb9c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UI5hWDFYtRyIIM6fIW-QB

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 x402-market-api-test-echo-cdp-high-price-61b0cb9c -d '<json body>'
```

Example prompt: Send a POST request with a JSON body like {"hello": "world"} to the x402 echo endpoint priced at 0.10 USDC and show me what gets echoed back.

## When to prefer this

Use this endpoint specifically when testing x402 payment protocol behavior at the 0.10 USDC price point, particularly to validate Coinbase Bazaar price floor hypotheses or to compare payment flow behavior against the lower-priced 0.01 USDC echo variant. Not suitable for production use cases — purely a test/diagnostic endpoint.

## Known failure modes

- Payment not included or insufficient — x402 402 Payment Required response
- Body missing required 'input' field — validation error
- Invalid method specified (must be POST, PUT, or PATCH) — schema rejection
- bodyType not one of json/form-data/text — schema validation failure
- Cloudflare Worker unavailable — 5xx error

## How this service works

Identical to test-echo-cdp-fresh except priced at 0.10 USDC (= 100000 atomic units) instead of 0.01. Used to test the hypothesis that Coinbase Bazaar has an undocumented price floor above $0.01.

## Output

The endpoint returns an echo of the submitted request body, confirming that the x402 payment at 0.10 USDC was processed and the payload was received intact.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {},
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-market-api-test-echo-cdp-high-price-61b0cb9c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-market-api.lien-studio-akiyama.workers.dev](https://www.zero.xyz/host/x402-market-api.lien-studio-akiyama.workers.dev/llms.txt)