# QuantaFlow Rapid Crypto Screener API

> QuantaFlow Rapid Crypto Screener API is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-14).

Screens and retrieves cryptocurrency market data via a pay-per-call x402 gateway proxying the Rapid Crypto Screener API

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/rapid-crypto-screener-api?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-rapid-crypto-screener-api-3f1951a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bZO70_W2EuXgioXgU2sKe

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-rapid-crypto-screener-api-3f1951a7 -d '<json body>'
```

Example prompt: Screen cryptocurrencies and show me the top 10 coins by 24-hour volume change — I want price, market cap, and percent change for each.

## When to prefer this

Choose this endpoint when you need programmatic, pay-per-call access to cryptocurrency screening data without a monthly subscription — ideal for agents making infrequent or burst queries where per-request micropayment via x402/USDC is preferred over API key subscriptions. Best for web3-native agents that already manage USDC wallets.

## Known failure modes

- Payment failure (insufficient USDC balance or x402 protocol error) — returns 402 Payment Required
- Invalid path parameter causing upstream 404 from the crypto screener API
- Malformed query parameters resulting in upstream API validation error
- Upstream Rapid Crypto Screener API rate limit or downtime returning 503 or 500
- Missing or incorrect method field causing request routing failure

## How this service works

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

## Output

Returns the upstream Rapid Crypto Screener API response body (JSON) containing cryptocurrency screening results such as token names, prices, market caps, volume data, percentage changes, and other market indicators, passed through after successful $0.01 USDC x402 payment.

## 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-rapid-crypto-screener-api-3f1951a7/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)