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Polyform FX Rate — USD to Currency Conversion
x402
Polyform FX Rate — USD to Currency Conversion is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Returns the current USD exchange rate for one or more currencies, sourced from the European Central Bank via Frankfurter, paid per-call with USDC on Base.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.
Output
Returns a JSON object with the base currency (USD), today's date, the requested target currency and its rate against USD, the converted amount, and the data source (European Central Bank via Frankfurter).
Example use cases
Invoice currency conversion for freelancer
“I'm invoicing a client in Germany for $1,500 USD — what's the current USD to EUR exchange rate so I can show the euro equivalent on the invoice?”
Travel budget planning in GBP
“I'm heading to London next month and want to know how many British pounds my $2,000 travel budget is worth at today's rate.”
Real-time FX check for trading dashboard
“Fetch the current USD to CHF exchange rate — I need the latest figure from the European Central Bank for my portfolio tracker.”
Technical details
Endpoint
GEThttps://api.polyform.org/v1/fx/rate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a reliable, ECB-sourced USD exchange rate with no API key or account setup, and you are comfortable paying $0.003 USDC per call via x402 on Base. Ideal for AI agents that need one-off or infrequent FX lookups without a subscription commitment.
Side effects
- Unsupported or invalid currency code returns an error
- ECB/Frankfurter data source unavailable causes fetch failure
- Payment not confirmed on Base results in 402 rejection
- Malformed query parameters return a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"base": "USD",
"date": "2026-09-28",
"rates": {
"EUR": {
"rate": 0.923,
"converted": 0.923
}
},
"amount": 1,
"source": "European Central Bank via Frankfurter"
}
}Tags
x402
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