# QuantaFlow x402 API Gateway – JSONPlaceholder Proxy

> QuantaFlow x402 API Gateway – JSONPlaceholder Proxy is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Proxies HTTP requests to the JSONPlaceholder API via the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/jsonplaceholder?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-jsonplaceholder-proxy-d039e7c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_isMBsMGAgppn07g6nAM26

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 quantaflow-x402-api-gateway-jsonplaceholder-proxy-d039e7c7 -d '<json body>'
```

Example prompt: Fetch the JSONPlaceholder post with id 1 by routing the GET request through the QuantaFlow x402 gateway at path /posts/1 — pay the 0.01 USDC fee per call.

## When to prefer this

Choose this endpoint when you need to test or demonstrate the x402 micropayment protocol against a well-known, predictable REST API (JSONPlaceholder), or when you want to integrate on-chain USDC payments into a workflow that calls standard REST endpoints. Not suitable for production data retrieval or real-world REST APIs beyond JSONPlaceholder.

## Known failure modes

- Insufficient USDC balance causes payment failure and request rejection
- Invalid path returns a 404 from JSONPlaceholder passed through the proxy
- Malformed JSON body causes upstream error response
- x402 facilitator unavailable leads to payment timeout or gateway error
- Unsupported HTTP method may be rejected by upstream

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

The raw upstream response body from JSONPlaceholder (JSON), passed through as-is along with the content-type header, after the x402 micropayment of $0.01 USDC is settled on-chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-x402-api-gateway-jsonplaceholder-proxy-d039e7c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)