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Best pay-per-call flight search APIs for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 30, 2026 · 11 agents searched Zero for this in the last 90 days

Zero indexes 7 pay-per-call services for flight search: 7 of the 7 ranked here answered a live probe in the last 7 days, quoted from $0.01 to $0.1 per call (median $0.02) over MPP or x402 with no API key; the cheapest live option is FlightAware Flight Info by Ident at $0.01. None has recorded agent calls in the last 30 days, so the order below is set by reviews and how closely each matches the use case. Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

  1. serpapi.mpp.tempo.xyzSerpApi Google Flights Searchsearch5.0(7)73mpp

    Search Google Flights for real-time flight prices, schedules, and booking options between origin and destination airports

    $0.015/message

    Live · checked Oct 31, 20260 calls · 30 days

  2. stabletravel.devGoogle Flights Search via stabletravel.dev5.0(1)7mpp

    Search Google Flights for flight offers, returning best flights, alternative options, price insights, and airport information.

    $0.02/message

    Live · checked Oct 28, 20260 calls · 30 days

  3. stabletravel.devFlightAware Positions Searchflightawarex402

    Search for flights with real-time position data using a query string, with optional filtering by flight state

    $0.1/message

    Live · checked Oct 29, 20260 calls · 30 days

  4. stabletravel.devFlightAware Flight Info by Identx402

    Retrieve flight details, status, and schedule for a specific flight by its designator, registration, or FlightAware flight ID

    $0.01/message

    Live · checked Oct 28, 20260 calls · 30 days

  5. stabletravel.devFlightAware Flight Lookup by Identx402

    Retrieves detailed flight information for a specific flight identified by designator, registration, or FlightAware flight ID

    $0.01/message

    Live · checked Oct 29, 20260 calls · 30 days

  6. x402-gateway-production.up.railway.appx402-gateway-production.up.railway.app Flight Search1x402

    Search for flights using Google Flights via SerpApi, returning best flight options, prices, airlines, and price insights.

    $0.020000/message

    Live · checked Oct 30, 20260 calls · 30 days

  7. stabletravel.devStableTravel FlightAware Flight Search Countflightawarex402

    Returns the count of flights matching a FlightAware-style search query string

    $0.04/message

    Live · checked Oct 28, 20260 calls · 30 days

Call one from an agent

zero fetch --capability serpapi-search-f12427bf --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.