# x402-market-api CDP-Mode Echo (Fresh/v2-spec)

> x402-market-api CDP-Mode Echo (Fresh/v2-spec) is a paid API for AI agents from x402-market-api.lien-studio-akiyama.workers.dev, paid per call via x402, $0.010000/call, status unknown (last checked 2026-09-14).

Echoes back an HTTP POST request body through a CDP-mode x402 payment-gated endpoint, used to validate the corrected v2-spec PaymentPayload.extensions wire format in Bazaar discovery.

## Facts

- Endpoint: POST https://x402-market-api.lien-studio-akiyama.workers.dev/api/seller-4068b8fc/test-echo-cdp-fresh
- Price: $0.010000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-market-api-cdp-mode-echo-fresh-v2-spec-b913a8ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2O8o_FIs6sauKjEynPdMI

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-cdp-mode-echo-fresh-v2-spec-b913a8ee -d '<json body>'
```

Example prompt: Send a test POST with a JSON body like {"hello": "world"} to the fresh CDP-mode echo endpoint and show me what gets echoed back — I want to confirm the x402 v2-spec payment flow and Bazaar indexer pickup are working correctly.

## When to prefer this

Use this endpoint when you need to test the x402 v2-spec PaymentPayload.extensions wire format specifically with a freshly indexed Bazaar resource in CDP mode. Prefer this over the other CDP echo siblings (test-echo-cdp, test-echo-cdp-2) when you want to verify that brand-new resources indexed only with the corrected wire format are picked up by Bazaar discovery. At $0.01 USDC it is the cheapest CDP-mode echo option available on this host.

## Known failure modes

- Payment not provided or invalid x402 PaymentPayload — returns 402 Payment Required
- Malformed input: missing required fields (type, method, bodyType, body) — returns 400 Bad Request
- Unsupported HTTP method (must be POST/PUT/PATCH) — returns 422 Unprocessable Entity
- CDP facilitator settlement failure — payment rejected, no echo returned
- Incorrect wire format for PaymentPayload.extensions — payment rejected pre-v2-spec fix

## How this service works

Third cdp-mode echo listing, created after the v2-spec PaymentPayload.extensions fix. Used to test whether a brand-new resource indexed only with the corrected wire format gets picked up by Bazaar discovery.

## Output

The endpoint echoes back the submitted HTTP request body along with an output type descriptor. The response confirms whether the x402 v2-spec PaymentPayload.extensions wire format was accepted and processed correctly through the CDP facilitator.

## 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-cdp-mode-echo-fresh-v2-spec-b913a8ee/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)