Reference data · x402
fx
Currency conversion at the official European Central Bank reference rate (via Frankfurter), with rate date. 30+ fiat currencies.
0.001 USDC / call · {atomic} atomic · 1000 atomic
Endpoint
GET|POST https://x402-gateway.forge-x402.workers.dev/api/fx
MCP tool:: fx
Parameters
| Name | Required | Type | Description |
|---|---|---|---|
from | Required | string | — |
to | Required | string | — |
amount | Optional | string | — |
date | Optional | string | optional YYYY-MM-DD historical rate |
Example request (unpaid — expect 402)
curl -sS -D - "https://x402-gateway.forge-x402.workers.dev/api/fx?from=EUR&to=USD&amount=100"
Example 402 challenge
The same object is also sent as a base64 PAYMENT-REQUIRED header. Amounts are atomic USDC units (6 decimals).
{
"x402Version": 2,
"error": "Payment required",
"resource": {
"url": "https://x402-gateway.forge-x402.workers.dev/api/fx",
"description": "Currency conversion at the official European Central Bank reference rate (via Frankfurter), with rate date. 30+ fiat currencies.",
"mimeType": "application/json"
},
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]
}Retry with payment
curl -sS "https://x402-gateway.forge-x402.workers.dev/api/fx?from=EUR&to=USD&amount=100" \ -H "PAYMENT-SIGNATURE: $PAYMENT"
Example response
{
"from": "EUR",
"to": "USD",
"amount": 100,
"rate": 1.1267,
"result": 112.67,
"date": "2026-11-04",
"source": "ECB"
}