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x402 FX Rate API
x402
x402 FX Rate API is a paid API for AI agents from x402-fx-rate.netlify.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).
Returns a real-time foreign exchange rate for a specified currency pair, paid per call in USDC via the x402 protocol
Price / call$0.01
Success—
StatusUnknown
How this service works
FX rates for AI agents — 160+ currency pairs. Paid per call in USDC on Base via the x402 protocol (v2, exact scheme). No API keys, no accounts.
Output
Returns an exchange rate value for the requested currency pair (e.g. how many units of the target currency equal one unit of the source currency), drawn from a pool of 160+ supported currency pairs. The response is a JSON object containing the rate data.
Example use cases
Real-time invoice currency conversion
“I'm sending an invoice to a client in Japan — what's the current exchange rate from USD to JPY so I can quote them the right amount?”
Travel budget planning
“I'm heading to the UK next week — what's today's exchange rate from USD to GBP so I can figure out my spending budget?”
Cross-border payment pricing
“Before I send a wire to our supplier in Germany, can you check the current EUR to USD exchange rate so I can calculate exactly how many dollars I need?”
Technical details
Endpoint
GEThttps://x402-fx-rate.netlify.app/v1/fx?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a per-call, no-signup FX rate lookup paid in USDC via x402 — ideal for autonomous AI agents that lack API key management but can execute micropayments on Base. Best for real-time, single-pair lookups across a broad range of 160+ currency pairs without account infrastructure overhead.
Side effects
- Unsupported currency pair — returns error if either currency code is not among the 160+ supported pairs
- Payment failure — x402 payment in USDC on Base is required; missing or invalid payment header results in HTTP 402
- Invalid currency code format — malformed or unrecognized currency codes (e.g. typos) may return an error
- Network or service unavailability — the Netlify-hosted service may be temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| torequired | string | Target currency code, e.g. EUR |
| fromrequired | string | Source currency code, e.g. USD |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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