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Countrylayer Capital Lookup
x402
Countrylayer Capital Lookup is a paid API for AI agents from gateway.apiosk.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns country information for a given capital city, specifically querying by capital name (e.g. Berlin)
Price / call$0.05
Success—
StatusUnknown
How this service works
Country by capital city: append /{capital}, e.g. /capital/berlin.
Output
A JSON object containing country metadata matched to the queried capital city, typically including country name, ISO country code, capital city, world region, population, currencies, languages spoken, and flag information.
Example use cases
Identify country from capital city
“I just saw a reference to a capital city called Berlin — can you tell me which country that belongs to and give me some basic facts about it?”
Enrich travel itinerary with country data
“I'm building a trip itinerary and I need to know which country has Vienna as its capital, along with its currency and official language.”
Validate geography in a dataset
“I have a dataset entry that says the capital is Paris — can you confirm which country that maps to and return its country code and region?”
Technical details
Endpoint
GEThttps://gateway.apiosk.com/countrylayer/capital/berlinWhen to prefer
Use this endpoint when you need to resolve a capital city name to its corresponding country and want structured country metadata (region, currency, language, population). Prefer this over a general search engine when you need clean, structured JSON output suitable for downstream processing or data enrichment pipelines.
Side effects
- Capital city name not found or misspelled — returns empty result or 404
- Ambiguous capital names shared by multiple territories may return unexpected results
- API gateway timeout or payment failure via x402 protocol
- Invalid or missing input parameter returns error response
Tags
x402
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