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Recipe · Flights API

Fare-alert cron with Cursor

The verdict field makes alerting trivial: poll on a schedule and fire only when price_range_in_relation_to_other_periods === "low". No home-grown price-history database needed, because Google’s band IS the history. Send the buy_link in the alert so the user can book from the notification.

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Step 1 · Connect

Add to .cursor/mcp.json

Restart Cursor and the tools appear in the Agent toolbox. Same shape works in any mcp.json-style client.

connect
{
  "mcpServers": {
    "flights": {
      "url": "https://flights.flightpowers.com/mcp",
      "headers": { "x-rapidapi-key": "YOUR_RAPIDAPI_KEY" }
    }
  }
}

Bring your own RapidAPI key: every request is billed to your own subscription, never ours.

Step 2 · Ask it

The prompt

Verbatim: paste it, or anything shaped like it. The agent maps it to the call below.

“Every morning, check JFK→LHR fares for my December dates and alert me when Google’s verdict flips to low.”

Step 3 · Under the hood

What the agent calls

No glue code: the agent reads the tool schema, picks the tool, and fills these parameters from your prompt.

tool call
// search_oneway_flights
{
  "from_airport": "JFK",
  "to_airport": "LHR",
  "departure_date": "2026-12-10",
  "limit": 3
}

Step 4 · Read the response

Fields your logic reads

The response is flat JSON. These are the fields this recipe branches on, with what each one means.

pricestring

The fare as Google Flights displays it: “$56”. The numeric twin price_as_number rides alongside for sorting and arithmetic.

price_range_in_relation_to_other_periods"low" | "typical" | "high" | null

Google’s verdict on the current fare against that band, the single field alerting, ranking, and “book now” logic branch on.

buy_linkstring (URL)

A Google Flights deep link that reopens this exact itinerary. Hand it to the user; it just works.

Questions, answered plainly

Is my key billed to me?
Yes. The MCP server is bring-your-own-key: Cursor sends your RapidAPI key with each call and usage meters against your own subscription on RapidAPI. There is no FlightPowers account and no second bill.
Does this need a server of mine?
No. The MCP servers are hosted at flights.flightpowers.com and hotels.flightpowers.com: you add a URL to Cursor, not a deployment.
What does it cost?
The Google Flights Live API's free tier is 10 requests/month with a hard cap: enough to verify your key works, not to evaluate. The PRO plan is $10/month for 2,500 requests, and every plan includes every endpoint. A single daily check is about 30 requests a month: past the free tier’s 10, comfortably inside PRO.

Also works with

Fare-alert cron, elsewhere in your stack

Fare-alert cron in ClaudeFare-alert cron in ChatGPTFare-alert cron in Claude CodeFare-alert cron in n8nFare-alert cron in OpenClaw

More recipes

More to build in Cursor

One-way flight search

Flights API · search_oneway_flights

Round-trip search

Flights API · search_roundtrip_flights

Price-insights check

Flights API · search_oneway_flights

Cheapest-date scan

Flights API · search_oneway_flights

Hotel search

Hotels API · search_hotels

Rate-parity check

Hotels API · find_hotel_by_name

Ready to judge a fare, not just fetch it?

Live Google Flights and Booking.com data, with the price band and verdict attached to every result. Free tier on RapidAPI, no card to try.

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Free tier: 10 requests/month. No card to try.