# QuantaFlow x402 API Gateway – CoinRanking Proxy

> QuantaFlow x402 API Gateway – CoinRanking 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 2026-09-15).

Proxies requests to the CoinRanking cryptocurrency data API via x402 micropayment protocol, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/rapid-coinranking1
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-coinranking-proxy-72618455
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-o2RhsZjnXhBXtqh6ySbC

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-coinranking-proxy-72618455 -d '<json body>'
```

Example prompt: Pull the current top 10 cryptocurrencies by market cap from CoinRanking — I want their names, prices, and 24-hour change percentages.

## When to prefer this

Choose this endpoint when you need cryptocurrency market data (rankings, prices, volumes) and are operating in a web3/DeFi environment with x402 micropayment capability. Ideal for agents that already have USDC wallet infrastructure and want pay-per-call access to CoinRanking data without a monthly API subscription.

## Known failure modes

- Payment failure: insufficient USDC balance or wallet not configured for x402 protocol
- Invalid path: upstream CoinRanking endpoint not found (404)
- Rate limiting: RapidAPI quota exceeded on the upstream key
- Malformed query parameters causing upstream API errors
- Network timeout proxying to CoinRanking upstream

## How this service works

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

## Output

The raw upstream CoinRanking API response passed through after successful x402 micropayment, including cryptocurrency rankings, prices, market caps, trading volumes, and other coin metadata in JSON format.

## 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-coinranking-proxy-72618455/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)