Fx Live

{
  "amount_usd": 1000,
  "block": 52445369,
  "cached": false,
  "chain": "base",
  "disclaimer": "Indicative on-chain prices read from one public stablecoin pool per pair on Base (the best of up to three configured pools) at the stated block. They are not dealable quotes, not a fixing and not investment advice: a pool price can differ from the interbank rate, move every block and be moved by a single trade. Do not use them to settle trades or as an oracle.",
  "errors": [],
  "indicative": true,
  "licence": "Chain data: no licence restrictions. The ECB reference rate beside each mid is available free of charge from the ECB website; it is published for information purposes only.",
  "method": "bid/ask: USDC per unit of the stablecoin from the pool's QuoterV2 (fee included) at USD 100. mid: geometric mean sqrt(bid * ask), which removes the pool fee. deviation_pct = (mid / ecb - 1) * 100.",
  "pairs": [
    {
      "ask": "1.1198134",
      "base": "EUR",
      "bid": "1.1196564",
      "block": 52445369,
      "buy_leg_block": 52445368,
      "buy_leg_timestamp": "2026-10-11T00:54:43Z",
      "deviation_pct": -0.0772,
      "ecb": {
        "date": "2026-10-09",
        "rate": "1.1206",
        "stale": false
      },
      "fee_pct": 0.007,
      "fee_tier": 70,
      "mid": "1.1197349",
      "pair": "EURUSD",
      "pool": "0xf39B7c34BE147F5DC1bC374f27AF2E9f03AD3113",
      "pools_quoted": 3,
      "price_impact_buy_pct": 0.0001,
      "price_impact_pct": 0.0001,
      "price_impact_sell_pct": 0.0001,
      "quote": "USD",
      "quoter": "0x514c8B5f54112481E28028F1166Bd78501089259",
      "reference_usd": 1000,
      "small_usd": 100,
      "spread_pct": 0.014,
      "stablecoin": {
        "address": "0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42",
        "decimals": 6,
        "symbol": "EURC"
      },
      "timestamp": "2026-10-11T00:54:45Z",
      "venue": "aerodrome_slipstream"
    }
  ],
  "small_usd": 100,
  "thin": [
    {
      "pair": "USDAUD",
      "pool": "0xCde41D0B1AD079C3CeB7271559F738f503102852",
      "reason": "about USD 261 of USDC in the pool; a USD 1,000 buy returned about USD 194 on the way back",
      "researched": "2026-10-11",
      "stablecoin": "AUDD",
      "token": "0x449B3317a6d1efb1Bc3ba0700C9EaA4FFFf4Ae65",
      "usdc_in_pool": 261,
      "venue": "aerodrome_slipstream"
    }
  ],
  "timestamp": "2026-10-11T00:54:45Z"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tanod.dev/v1/fx/live' \
  -H 'content-type: application/json' \
  --data-raw '{}'

# 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://tanod.dev/v1/fx/live' \
  -H 'content-type: application/json' \
  --data-raw '{}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftanod.dev%2Fv1%2Ffx%2Flive&method=POST
const res = await pay("https://tanod.dev/v1/fx/live", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({}),
});
console.log(res.status, await res.text());

# 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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://tanod.dev/v1/fx/live",
        json={},
    )
    print(res.status_code, res.text)