Cloudflare Turnstile
Cloudflare Turnstile is Cloudflare's free, smart CAPTCHA alternative that verifies real users without sending traffic through Cloudflare's network. It runs non-interactive client-side challenges (proof-of-work, proof-of-space, web API probing, browser-integrity checks) and returns a short-lived token that the relying server validates against the Turnstile siteverify endpoint. Turnstile offers three widget modes — Managed (risk-adapted), Non-interactive (no user gesture), and Invisible (fully hidden) — and is designed to run on any website regardless of whether the site is proxied through Cloudflare. The product is targeted at developers who want a privacy-respecting reCAPTCHA replacement.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Cloudflare Turnstile the way a machine reads it — 12 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Cloudflare Turnstile scores 36.1/100 (thin), with a separate agent-readiness read of 39/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Cloudflare Turnstile
Each block below is one kind of artifact we hold for Cloudflare Turnstile. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Turnstile Siteverify API
The Turnstile siteverify endpoint accepts a token produced by the browser widget along with the site's secret key and an optional remote IP and idempotency key, and returns a JS...
Turnstile Client Widget
The Turnstile client widget renders the challenge in the browser. It is loaded via a script tag at challenges.cloudflare.com/turnstile/v0/api.js and configured with a sitekey, o...
Turnstile Pre-Clearance
Pre-clearance lets a successful Turnstile challenge set a cookie that Cloudflare-proxied properties can honor to skip subsequent bot challenges for the same visitor, which is us...
Cloudflare Turnstile Management API
Turnstile widgets and analytics are managed through the broader Cloudflare API, which exposes endpoints to list, create, update, and rotate Turnstile sitekeys, retrieve analytic...
Cloudflare Turnstile Verification API
The Verification API from Cloudflare Turnstile — 1 operation(s) for verification.
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Cloudflare Turnstile Siteverify API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Cloudflare Turnstile Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Cloudflare Turnstile — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/cloudflare-turnstile · machine-readable index on apis.io