{"id":"e4d5de31-aded-45e9-a932-66baa85a24e0","shortId":"5fLKjp","kind":"mpp","title":"Search cities by keyword via Amadeus reference data — $0.005/request, pay with USDC on Tempo.","tagline":"Search cities by keyword via Amadeus reference data — $0.005/request, pay with USDC on Tempo.","description":"This endpoint searches for cities by keyword using Amadeus reference data, returning matching city names and IATA codes. It is part of the StableTravel API suite, which provides pay-per-request access to flights, hotels, activities, transfers, real-time flight tracking (FlightAware), and Google Flights price comparison — all without API keys or subscriptions.\n\nThe `/api/reference/cities` endpoint accepts a required `keyword` query parameter (the city name to search) and optional parameters: `countryCode` (ISO 3166-1 filter), `max` (result limit), and `include=Airports` to embed associated airport data. It costs $0.0054 per call. Payment is handled automatically via the MPP protocol using USDC on the Tempo L2 chain (chainId 4217). The endpoint returns a JSON object with a `data` array of matching cities, optional `included` airport associations, and metadata.\n\nStableTravel is operated by Merit Systems and serves as a unified gateway to Amadeus GDS, FlightAware AeroAPI, and Google Flights (via SerpAPI). The full API covers 70+ endpoints spanning flight search/booking, hotel discovery/booking, activity search, airport transfers, airline/airport reference lookups, real-time flight tracking, historical flight data, airport weather (METAR/TAF), and disruption statistics. Prices range from $0.001 to $0.40 per request depending on the endpoint. A complete OpenAPI 3.1 spec is published at `/openapi.json`.","tags":["amadeus","flightaware","flights","hotels","activities","transfers","travel"],"capabilities":["city-search","iata-code-lookup","keyword-autocomplete","airport-association","reference-data","amadeus-gds","pay-per-request","mpp-protocol","tempo-l2","usdc-payment"],"categories":["geo","travel"],"synonyms":["city lookup","IATA city code search","city autocomplete","travel reference data","Amadeus city search","city IATA resolver","destination search","city finder API"],"warnings":["Response schema uses generic `items: {}` — actual response structure is inferred from Amadeus API conventions, not explicitly defined in the OpenAPI spec.","No example response is provided in the OpenAPI spec for this endpoint."],"endpointUrl":"https://stabletravel.dev/api/reference/cities","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stabletravel.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 schema with detailed parameter definitions, clear pricing ($0.0054/call), live 402 MPP challenge confirmed, and extensive guidance documentation. Response schema for this specific endpoint is generic (`items: {}`) so the example response is inferred from Amadeus conventions rather than directly 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keyword"},"description":"Search cities by keyword"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The /api/reference/cities endpoint costs $0.005400 per request (fixed price in USD).","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"Payment is via MPP protocol using Tempo method (chainId 4217) with USDC.","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"Required parameter is keyword (string); optional parameters include countryCode, max, and include (enum: Airports).","source_url":"https://stabletravel.dev/openapi.json"},{"claim":"StableTravel provides pay-per-request access to Amadeus, FlightAware AeroAPI, and Google Flights data. No auth, no API keys, no subscriptions.","source_url":"https://stabletravel.dev"},{"claim":"The endpoint is live, confirmed by a 402 MPP challenge response on HEAD request.","source_url":"https://stabletravel.dev/api/reference/cities"},{"claim":"StableTravel is operated by Merit Systems.","source_url":"https://stabletravel.dev/openapi.json"}],"useCases":["Resolve a city name to its IATA code before searching for flights or hotels","Build a city autocomplete/typeahead for a travel booking interface","Look up cities in a specific country for destination planning","Retrieve associated airports for a given city keyword","Agent-driven itinerary planning that needs to map user input to structured city codes"],"bestFor":["AI travel agents that need to resolve free-text city names to IATA codes","Autonomous booking workflows where city disambiguation is the first step","Lightweight reference lookups at sub-cent cost with no API key setup"],"notFor":["High-volume batch geocoding (this is a keyword search, not a geocoder)","Applications that need full geographic coordinates — use the airports-by-geocode endpoint instead","Free-tier usage — every call costs $0.0054 via micropayment"],"kindDetails":{"docs":{"llmsTxt":"https://stabletravel.dev/llms.txt","homepage":"https://stabletravel.dev"},"tags":["amadeus","flightaware","flights","hotels","activities","transfers","travel"],"realm":"stabletravel.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stabletravel.dev","name":"Merit Systems"},"categories":["data","web"],"service_id":"stabletravel","integration":"first-party","service_name":"StableTravel","service_description":"Pay-per-request travel APIs — flights, hotels, activities, transfers, and real-time flight tracking. Powered by Amadeus and FlightAware."},"updatedAt":"2026-04-22T05:45:10.321Z"}}