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Best pay-per-call exchange rates APIs for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 28, 2026 · 6 agents searched Zero for this in the last 90 days

Zero indexes 37 pay-per-call services for exchange rates. Of the 10 ranked here, 10 answered a live probe in the last 7 days. Quoted prices run from $0.001 to $0.055 per call, median $0.006, paid per call over x402 or MPP with no API key. The one with real agent usage in the last 30 days is agentsvc.io Exchange Rates API. The cheapest live option is TickersFeed FX Rate at $0.001.

  1. agentsvc.ioagentsvc.io Exchange Rates API1x402

    Returns live foreign exchange rates for a given base currency against one or more target currencies, sourced from the European Central Bank via frankfurter.dev

    $0.0045/message

    Live · checked Oct 31, 20261 call · 30 days

  2. fx.withzero.aiCurrency Exchange (ECB/Frankfurter)finance5.0(2)5mpp

    Converts one or more currencies using European Central Bank exchange rates via the Frankfurter API, returning converted amounts, exchange rates, and rate date.

    Free/message

    Live · checked Oct 29, 20260 calls · 30 days

  3. alphavantage.mpp.paywithlocus.comAlpha Vantage Currency Exchange Ratefinance5.0(2)14mpp

    Returns the real-time exchange rate between any two currencies, including fiat and crypto pairs

    $0.008/message

    Live · checked Oct 30, 20260 calls · 30 days

  4. api.strale.ioForex Historical Exchange Rates4.7(1)1x402

    Returns daily historical exchange rates between two currencies including average, min, max, and change percentage over a date range

    $0.054001/message

    Live · checked Oct 29, 20260 calls · 30 days

  5. x402.agentutility.aix402.agentutility.ai Exchange Ratesx402

    Returns latest or historical foreign exchange rates from the European Central Bank, with optional amount conversion across 30+ currency pairs.

    $0.002/message

    Live · checked Oct 30, 20260 calls · 30 days

  6. api.gocreativeai.comGoCreative Forex Exchange Rate Lookupx402

    Returns the current exchange rate for a given currency pair using ECB/Frankfurter data

    $0.01/message

    Live · checked Oct 29, 20260 calls · 30 days

  7. 2s.io2s.io FX Rates (ECB via Frankfurter)1x402

    Returns daily reference exchange rates from the European Central Bank for 30+ currencies, with optional historical lookup back to 1999 and optional amount conversion.

    $0.0012/message

    Live · checked Oct 30, 20260 calls · 30 days

  8. abstract-exchange-rates.mpp.paywithlocus.comAbstract Exchange Rates - Live Ratesforexmpp

    Returns the current live exchange rate(s) for a base currency against one or all supported target currencies

    $0.006/message

    Live · checked Oct 30, 20260 calls · 30 days

  9. api.tickersfeed.netTickersFeed FX Rate — Single Currency Pairx402

    Returns the current foreign exchange rate for a specified currency pair using European Central Bank (ECB) data via Frankfurter.

    $0.001/message

    Live · checked Oct 27, 20260 calls · 30 days

  10. gateway.apiosk.comFrankfurter Exchange Rates via APIosk Gatewayx402

    Returns the latest foreign exchange rates for a given base currency against one or more target currencies

    $0.055/message

    Live · checked Oct 29, 20260 calls · 30 days

Call one from an agent

zero fetch --capability agentsvc-io-exchange-rates-api-67a4b90d --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.

Best exchange rates APIs (October 2026) | Zero