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Fx Rates

by ECB FX Rates for Agents in Markets & finance

x402 APIPassing, checked 2 h ago

Delx Commerce currency exchange rates API for agents at $0.001 USDC. Call when you need daily ECB FX rates (EUR/USD/BRL and other published pairs) with source attribution—not a live broker quote or trade execution. Returns bounded cross-rates via x402; informational only, no trading advice.

POST https://api.delx.ai/api/v1/x402/fx-rates

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Status and outage history · Atom feed

Uptime
100%
Response time
13 ms typical, 177 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

POST https://api.delx.ai/api/v1/x402/fx-rates

Each call costs $0.001 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://api.delx.ai/api/v1/x402/fx-rates
content-type: application/json

{
  "base_currency": "USD",
  "quotes": [
    "EUR",
    "BRL"
  ]
}

Parameters

ParameterTypeRequiredDescription
base_currencystringNoThree-letter ISO currency code used as the base. Default: "EUR".
datestring (date)NoOptional ECB publication date, today or up to 31 days in the past.
quotesarray of stringNoOptional quote currencies; omit to return all currencies in the selected ECB publication.
timeoutintegerNo Default: 8.

Example response

The provider's example. We can't check it without paying.

{
  "result": {
    "attribution": "Reference rates supplied by the European Central Bank; see provider_url and reuse_policy_url for source and reuse terms.",
    "base_currency": "USD",
    "cache": "miss",
    "data_note": "Informational reference rates only; this is not a transaction quote, execution venue, or trading advice.",
    "provider": "European Central Bank",
    "provider_url": "https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html",
    "rate_date": "2026-07-31",
    "rates": {
      "BRL": "5.742383",
      "EUR": "0.87804021"
    },
    "requested_quotes": [
      "EUR",
      "BRL"
    ],
    "reuse_policy_url": "https://www.ecb.europa.eu/stats/ecb_statistics/governance_and_quality_framework/html/usage_policy.en.html",
    "schema": "delx/fx-rates/v1",
    "upstream_error": false
  },
  "tool_name": "get_fx_rates_ecb"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.delx.ai/api/v1/x402/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"base_currency":"USD","quotes":["EUR","BRL"]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.delx.ai/api/v1/x402/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"base_currency":"USD","quotes":["EUR","BRL"]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.delx.ai%2Fapi%2Fv1%2Fx402%2Ffx-rates&method=POST
const res = await pay("https://api.delx.ai/api/v1/x402/fx-rates", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "base_currency": "USD",
    "quotes": [
      "EUR",
      "BRL"
    ]
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.delx.ai/api/v1/x402/fx-rates",
        json={
            "base_currency": "USD",
            "quotes": [
                "EUR",
                "BRL",
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed4028 ms$0.001
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