Finance · x402
fx-history
Official ECB reference-rate time series for a currency pair (or up to 10 targets) over a date range up to 2 years: daily points plus first/last/min/max/mean/% change.
0.002 USDC / call · {atomic} atomic · 2000 atomic
Endpoint
GET|POST https://forge-tools.dentreprise.workers.dev/api/fx-history
Parameters
| Name | Required | Type | Description |
|---|---|---|---|
from | Optional | string | Base ISO 4217, default EUR |
to | Required | string | Target(s), comma-separated |
start | Required | string | YYYY-MM-DD |
end | Optional | string | YYYY-MM-DD, default today |
Example request (unpaid — expect 402)
curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/fx-history?from=EUR&to=USD&start=2026-01-01&end=2026-03-31"
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://forge-tools.dentreprise.workers.dev/api/fx-history",
"description": "Official ECB reference-rate time series for a currency pair (or up to 10 targets) over a date range up to 2 years: daily points plus first/last/min/max/mean/% change.",
"mimeType": "application/json"
},
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "2000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]
}Retry with payment
curl -sS "https://forge-tools.dentreprise.workers.dev/api/fx-history?from=EUR&to=USD&start=2026-01-01&end=2026-03-31" \ -H "PAYMENT-SIGNATURE: $PAYMENT"
Example response
{
"observations": 63,
"series": {
"USD": {
"stats": {
"min": 1.16,
"max": 1.19,
"change_pct": 1.2
}
}
}
}