Historical FX rate by date

Historical foreign-exchange rate for a specific date using European Central Bank reference rates (via Frankfurter). Send GET /api/fx-historical with the required fields from, to and date and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with from, to, date, rate and source.

Returns the rate that was published on (or rolled forward to) the requested date. ?from=USD&to=EUR&date=2024-01-02

Category: Live public data · Tags: forex fx currency historical exchange-rate ecb macro

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Parameters

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for fx-historical; any x402 v2 or MPP client pays it and retries.

Example response

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

From an MCP client

catalog.call {
  "slug": "fx-historical",
  "params": {
    "from": "USD",
    "to": "EUR",
    "date": "2024-01-02"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for fx-historical; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• from, to and date are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/fx-historical is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
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");

Part of these workflows

Historical FX rate by date is one step in this skill pack, each sold as a single call:

• FX monitor - Major currency snapshot: EUR/USD, GBP/USD, JPY/USD rates plus the full FX dashboard in one call.

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