Historical FX rate by date

Historical foreign-exchange rate for a specific date using European Central Bank reference rates (via Frankfurter). Returns the rate that was published on (or rolled forward to) the requested date. ?from=USD&to=EUR&date=2024-01-02

Input

Field	Type	Description
from *	string	3-letter source currency code, e.g. USD
to *	string	3-letter target currency code, e.g. EUR
date *	string	ISO date (YYYY-MM-DD)

Example output

{
  "from": "USD",
  "to": "EUR",
  "date": "2024-01-02",
  "rate": 0.9128,
  "source": "ECB via Frankfurter"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/fx-historical?from=USD&to=EUR&date=2024-01-02"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/fx-historical?from=USD&to=EUR&date=2024-01-02");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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