# QuantaFlow Rapid Multi-Currency Crypto Exchange Rates API

> QuantaFlow Rapid Multi-Currency Crypto Exchange Rates 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 2026-10-12).

Fetches real-time multi-currency cryptocurrency exchange rates via an x402 pay-per-call gateway

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/rapid-multi-currency-crypto-exchange-rates-api?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-rapid-multi-currency-crypto-exchange-rates-api-f71bfdb4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d1oynjNH-iOpSv_QxYL24

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-multi-currency-crypto-exchange-rates-api-f71bfdb4 -d '<json body>'
```

Example prompt: What are the current exchange rates for Bitcoin, Ethereum, and Solana in USD and EUR right now?

## When to prefer this

Choose this endpoint when you need real-time multi-currency cryptocurrency exchange rates in a web3 or DeFi context and are comfortable with x402 micropayment settlement in USDC. Prefer this over free alternatives when you need pay-per-call pricing with no subscription overhead, or when building agents that require autonomous micropayment-native API access on Base or other EVM chains.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment rejected, resulting in 402 Payment Required
- Upstream API unavailable: the proxied exchange rate service is down, returning a 502 or 503
- Invalid currency pair: queried crypto or fiat symbol not supported by upstream, returning an error or empty result
- Malformed request body: incorrect JSON structure passed in the body field causing upstream rejection
- Rate limit exceeded on upstream API causing throttled or failed responses

## How this service works

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

## Output

Returns real-time cryptocurrency exchange rate data for multiple currency pairs, including current prices and conversion rates sourced from the upstream Rapid API crypto exchange rates service, passed through after successful x402 micropayment.

## 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-multi-currency-crypto-exchange-rates-api-f71bfdb4/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)