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x402engine Flight Search API
x402
x402engine Flight Search API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.02/call, status healthy (last checked 2026-09-14, last successful call 2026-09-08).
Searches for available flights between two airports on a given date, with optional filters for stops, class, price, and passengers, billed per call via USDC micropayment.
Price / call$0.02typically ~$0.020/call
Success100%
StatusHealthy
How this service works
Search flights via Google Flights (SerpApi). Returns best flights, prices, airlines, and price insights.
Output
Returns a list of available flights matching the search criteria, including airline, departure and arrival times, number of stops, travel class, price in the requested currency, and flight duration. Results are filtered by any optional parameters such as max price, stop count, or travel class provided in the query.
Example use cases
Budget solo trip planning
“Search for the cheapest one-stop flights from Chicago O'Hare to London Heathrow departing June 10, economy class, for 1 adult — show anything under $700 USD.”
Family round-trip vacation search
“Find round-trip flights from SFO to JFK for 2 adults and 1 child, departing July 4 and returning July 11, economy class — what are my options?”
Business travel in premium cabin
“Look up business class flights from LAX to NRT departing September 3 for 1 adult — I want nonstop only if possible, priced in USD.”
Technical details
Endpoint
GEThttps://x402engine.app/api/travel/flightsWhen to prefer
Choose this endpoint when an AI agent needs to search for real-time flight availability and pricing between two specific airports on a given date, especially in a pay-per-call context without a subscription. It is well-suited for travel agents, trip-planning bots, or any workflow where the agent needs live flight data billed as a microtransaction in USDC on Base, MegaETH, or Solana rather than through a traditional API key subscription.
Side effects
- Missing required parameters (origin, destination, departureDate) returns a 400 validation error
- Invalid IATA airport codes return no results or an error
- Dates in the past or invalid date format (not YYYY-MM-DD) return an error
- No flights found for the given route/date combination returns an empty result set
- Payment failure or insufficient USDC balance returns HTTP 402
- Rate limiting or upstream flight data provider outage returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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Zero review prompt (fires after every successful call)
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