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X-RateLimit-Limit

de facto — unregistered response 4 spellings

Declared by 130 providers across 10633 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 4 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.

X-RateLimit-Limitx-ratelimit-limitx-RateLimit-LimitX-Ratelimit-Limit

Providers declaring it (130)

0xarchive 5dollarfootballapi abuseipdb adapt-io akamai algolia allowance alphaai anilist anvil api-evangelist api-snap apis-io apitoolkit appsmax-rest-api-v1 autoleadstar ava-protocol avito axiom-co aylien bargo-congress-trades-api bindbee bloomberg-lp bluecore brainfish buttondown cashfree celonis chargefox cledara coasty cofactr commercetools common-room confluent confluent-the-data-streaming-platform contextdev crob-at developerhub dext didit dietlyapi domaintools domscan dropbox eclipse elbo-ai-inc engineering-platform enrich-so eod-historical eodhd euronet ev-energy factset farmdash featureflip folk frameio getresponse getstream gist github gofundme gravatar green-button-alliance hakuna hellosign here hex-pm imagekit jira kanmon lemlist limble-cmms logiless loudcrowd lucent macadress maison-safqa-holdings-limited matter mediacaption-api metalend microsoft-azure mixmax moengage moneris mvmnt natural-ai nord-security npr nvd ok-capsule opengov openmercantil opensea overshoot overshootai papaya-global pdfshift persistiq pipedream playcanvas prezent princess-beef-heavy-industries prorataai qr-code-crafter quandl relace ron-swanson-quotes sendgrid silna snapapi-pics spaceship sylvia-api syntage takealot the-index-fyi universitat-hamburg usertesting voltair weavr webflow webflow-api-and-documentation-webflow weblate wefunder workera zamzar zapier zeroheight zoominfo

Explore

All headers Rate Limiting & Quota Guidance on headers.apievangelist.com

Work with this as data

Every header here is available over the APIs.io API and to AI agents over MCP. HTTP Headers is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for http headers

3 MCP tools reach this

apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

Search the catalog

curl "https://apis.io/api/v1/search?q=x-ratelimit-limit&limit=10"

Everything under a tag

curl "https://apis.io/api/v1/tags/x-ratelimit-limit"

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A second provider on the same verified email joins the account you already have.