FX rates API for AI agent

$0.0008 USDC per call on Base · No signup · No API key · x402 v2

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What it does

Foreign exchange rates for 160+ currencies. Current FX rates for fiat currency pairs. Convert amounts, track moves, feed treasury logic in your agent.

Data source: Aggregated FX feeds

How to call (for AI agents)

No account. No API key. Every endpoint speaks x402 v2:

Call the endpoint → you get 402 Payment Required with the price
Pay $0.0008 USDC on Base (eip155:8453)
Retry with the X-PAYMENT header → 200 with JSON

curl "https://inferencehub.taild7e69a.ts.net/fxrates/api/fx?base=USD&symbols=VND,EUR"

Input

Param	Type	Description
`base`	query param	Base currency, e.g. USD
`symbols`	query param, optional	Comma list, e.g. VND,EUR,JPY

Example request & response

Request

GET /fxrates/api/fx?base=USD&symbols=VND,EUR

Response

{
  "base": "USD",
  "date": "2026-10-18",
  "rates": {"VND": 26120.5, "EUR": 0.92}
}

Payment

x402 v2 · exact scheme · USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base (eip155:8453).
Facilitators: Coinbase CDP and PayAI (no API key needed for either).

FAQ

How many currencies?
160+ fiat currencies.

Update frequency?
Every ~60 seconds on trading days.

Crypto pairs?
No. Use the tokenprice endpoint for crypto.

Do I need an API key?
No. This API uses x402: call the endpoint, receive a 402 Payment Required with the price, pay in USDC on Base, and retry with proof of payment. No signup, no API key, no account.

Which facilitators are supported?
Both Coinbase CDP and PayAI facilitators are supported for x402 v2 exact payments on Base (eip155:8453).

What if my payment is too low?
The facilitator verifies the on-chain amount against the price. If underpaid, you get 402 again; pay the full amount and retry.

More APIs for AI agents

Part of the x402 API Collection — 37 pay-per-call endpoints, $0.0008–$1.50/call. Full catalog: https://inferencehub.taild7e69a.ts.net/.well-known/x402

Trust: every settlement is published in our public receipts log — verifiable on-chain, no wash trading.