Frankfurter (free FX rates) via Spawnpay

European Central Bank reference exchange rates — free, no rate-limit complaints.

Why route through Spawnpay

Currency conversion in agents. Cross-border SaaS pricing tooling. Multi-currency invoicing.

Endpoint

curl

curl -X POST https://spawnpay.ai/api/proxy \
  -H 'Authorization: Bearer spk_live_…' \
  -H 'Content-Type: application/json' \
  -d '{
  "provider": "frankfurter",
  "path": "/latest",
  "method": "GET",
  "query": {
    "amount": 100,
    "from": "USD",
    "to": "EUR"
  }
}'

Node (spawnpay-paywall)

import { proxy } from 'spawnpay-paywall';

const out = await proxy({
  "provider": "frankfurter",
  "path": "/latest",
  "method": "GET",
  "query": {
    "amount": 100,
    "from": "USD",
    "to": "EUR"
  }
});

console.log(out.status, out.body);
console.log('charged', out.charged); // txHash + $0.001 USDC receipt

What you get back

The full upstream JSON body, the upstream status code, the upstream response headers, plus a charged field with the USDC receipt (tx hash) when the call succeeded.