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QuantaFlow x402 API Gateway — Frankfurter Proxy
x402
QuantaFlow x402 API Gateway — Frankfurter 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 2026-10-12).
Proxies requests to the Frankfurter currency exchange rate API via the x402 micropayment protocol, charging $0.01 USDC per call.
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
The raw upstream Frankfurter API response body (JSON) containing exchange rate data, currency lists, or historical rate data, along with the content type header — passed through as-is after the x402 micropayment is settled.
Example use cases
Live currency rate lookup
“Can you get me the latest exchange rate from EUR to USD and GBP right now? Go ahead and pay the micropayment fee from my wallet.”
Historical exchange rate query
“What was the exchange rate between JPY and USD on January 15, 2024? Pull it from the Frankfurter proxy.”
Supported currencies listing
“Fetch me the full list of currencies that Frankfurter supports — I need to know which ones I can query rates for.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/frankfurter?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Frankfurter ECB exchange rate data and are operating in a web3/x402 micropayment context where per-call USDC billing is acceptable. It is ideal for agents that already have an x402-capable wallet and want to avoid API key management for currency data. Prefer direct Frankfurter API access if you need higher volume without per-call fees.
Side effects
- Payment failure — insufficient USDC balance causes 402 Payment Required with no upstream call made
- Invalid path — malformed or unsupported Frankfurter path returns upstream 404 or 400 error
- Upstream unavailability — Frankfurter service down returns a gateway error
- Invalid query parameters — unsupported currency codes or date formats return Frankfurter validation errors
- Network timeout — slow upstream response may cause gateway timeout
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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