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apikey

de facto — unregistered request 6 spellings

Declared by 83 providers across 982 published specification files in the APIs.io network.

What this header is for, and how to use it →

A count here is providers whose published contract declares this header — not providers who send it. Response headers set at the edge rarely appear in an OpenAPI at all, so a low number can measure documentation practice rather than deployment.

Spelled 6 ways

HTTP field names are case-insensitive (RFC 9110 §5.1), so every spelling below is the same header on the wire. A contract is not the wire: generated clients key off the string, and a developer reading two of these sees two different headers.

apikeyapiKeyApiKeyAPIKeyAPIKEYApikey

Providers declaring it (83)

advancedmd africastalking aramark attom-data attomdata bharti-airtel cellulant cflow charityapi checkiday-national-holiday-api clari cloudmersive cloudprinter clover cms cometchat coresignal crunchdao currencyapi currencylayer department-of-veterans-affairs docsumo figure figure-technology-solutions financial-modeling-prep fixer fleetmon freecurrencyapi gather golden golden-recursion gupshup hanko infoway-real-time-market-data-api jotform kpn kraken kuehne-nagel la-poste landingai layup-technologies lufthansa-cargo meltwater nagios nansen nerdio news-api nirvana nist numlookupapi nvd ondemand ozow placekey postnl pruna-ai recreation-gov rsc sap-brim-billing-and-revenue-innovation-management schema-free scispot sikoia songstats sorsa spectro-cloud supabase swish-analytics teachable ticketspice transitapp tricentis twelvedata tyntec uwa va va-gov veho viator vinculum visier xoserve zenscrape zenserp

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