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QuantaFlow Exchange Rate API (x402)
x402
QuantaFlow Exchange Rate API (x402) 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 cryptocurrency or fiat exchange rate data via a pay-per-call x402 micropayment gateway, charging $0.01 USDC per request.
Price / call$0.01
Success—
StatusUnknown
How this service works
Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.
Output
Returns the upstream exchange rate data as a pass-through response body (JSON), including the rate or price for the requested currency pair, along with the content type from the upstream provider. The exact schema depends on the upstream exchange rate service being proxied.
Example use cases
Live crypto price check
“What's the current price of Bitcoin in USD? Pull it from a live exchange rate feed.”
DeFi token conversion rate
“I need to know how many USDC I'd get for 1 ETH right now — can you look that up using a real-time exchange rate service?”
Fiat to crypto rate lookup
“What's the EUR to BTC exchange rate at this moment? I'm about to make a trade and need a current figure.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/exchangerate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time exchange rate or cryptocurrency price data and are operating in a web3/DeFi context where micropayment-based access ($0.01 USDC per call) via the x402 protocol is acceptable. It is particularly suited for AI agents that already hold USDC and need lightweight, pay-as-you-go access without API key management. Prefer it over free-tier REST APIs when you want deterministic per-call billing with no subscription overhead.
Side effects
- Payment failure: insufficient USDC balance or x402 payment not accepted — returns 402 Payment Required
- Invalid path or query: upstream exchange rate service returns 400 or 404 if the currency pair is not found
- Upstream service unavailable: 502 or 503 if the underlying exchange rate provider is down
- Malformed request body: upstream rejects the forwarded JSON body if improperly structured
- Rate limiting: upstream provider throttles requests even after payment is accepted
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | Optional JSON body forwarded to POST requests. |
| path | string | Path below the selected upstream origin. |
| query | object | |
| method | string |
Output
Schema · Response
{
"description": "The upstream response body and content type are passed through after successful payment."
}Tags
x402
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