Airports Reference
Busiest large airports ranked by annual passengers (latest Wikidata figure), optionally by country or continent.
DataLiveeip155:8453Exactvia cdp
AirportsHubsPassengersRanking
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$24.31
Verified settled volume
1,175 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-20 20:27Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb531320805C5BED1D46AEaDcF4F008FDF172DBDaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
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"summary": "Top 5 in EU: IST 84M (2025), LHR 84M (2024), CDG 67M (2023).",
"verdict": "RANKED",
"airports": [
{
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"lon": 28.73214,
"iata": "IST",
"icao": "LTFM",
"name": "İstanbul Airport",
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"summary": "Top 5 in EU: IST 84M (2025), LHR 84M (2024), CDG 67M (2023).",
"verdict": "RANKED",
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"passengers": 84457421,
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"elevationFt": 325,
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"passengersYear": 2025,
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"lon": -0.45991,
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"type": "large_airport",
"ident": "EGLL",
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"country": "GB",
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"regionName": "England",
"countryName": "United Kingdom",
"elevationFt": 83,
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"passengersYear": 2024,
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}
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"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"airports with no passenger figure in Wikidata (about 45% of large airports with IATA codes are missing, so a missing airport is not necessarily small)",
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"attribution": "Airport data: OurAirports.com (public domain), built 2026-10-11; checked against Wikidata (CC0). No guarantee of accuracy.",
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"catalog": "https://airports-reference.x402tookit.com/catalog",
"message": "Airports Reference has 8 pay-per-call endpoints (Airport lookup, nearest airports, distances, runways and hubs from OurAirports open data.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://airports-reference.x402tookit.com/openapi.json",
"related": [
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"path": "/airport-code-convert",
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{
"url": "https://airports-reference.x402tookit.com/airport-distance",
"path": "/airport-distance",
"what": "Great-circle distance in km, miles and nautical miles between two airports, with a rough…",
"price": "$0.02"
},
{
"url": "https://airports-reference.x402tookit.com/airport-lookup",
"path": "/airport-lookup",
"what": "Find an airport by IATA code, ICAO code or name with fuzzy matching: location, elevation,…",
"price": "$0.02"
}
]
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0xb531…2DBDa. The signed payment is good for 5 minutes.
- Paid to
- 0xb531…2DBDa
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
20000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- DUPiup…eEm8s
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
20000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
20000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
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"verdict": "RANKED",
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}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:27Z
- Last indexed by Roundhouse
- 2026-10-22 19:30Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 21:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Airports Reference and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Airports%20Reference' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://airports-reference.x402tookit.com/big-hubs, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.