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For sites

Free A–F report, every problem named

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Free. Every agent that asks is told who runs it

Daily checks from $29 a month, an alert the day anything breaks

We do the fixes for $749 and prove them

Listing check, compare two sites, the browser extension, YouTube

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Prove who runs it.

Registered sites answer every agent that asks: who runs this, what it declares, verified by a fetch. Free.

Data

US sites by state, category, grade and platform

AI crawler census

The top 1,000 sites, read daily, open CC BY data

Decisions, scans and crawler visits, counted

What registered sites declare, verified by a fetch

SEO and AI tools, measured

The vendors that measure sites, measured by the same rules

Lead lists

Sites sorted by what they serve.

Pick a state, category, grade or platform. See the live count and sample rows before you buy.

For agents

MCP, curl, Python, OpenAI Agents, Claude tool use

The signed answer about any domain, for a person

Capability registry

What sites say agents may do, and what was verified

How each named agent behaves on sites

Before you act

One signed answer, no key.

Read, cite, connect or transact: ask first, verify the receipt offline.

Start in a minute

Developers

Every endpoint, with a worked example

Resolve protocol

What the signed answer holds, how to verify it

npm and PyPI, with the offline verifier

The Ed25519 keys every answer is signed with

Every finding the measurement can raise

Learn

The scan, step by step, and what each grade means

Guides, findings and the glossary

Who sends each agent and what it reads

Pricing Sign in

Single sign-on

Sign in with your company account.

Your work email decides which identity provider you are sent to. Nothing is created until your provider confirms who you are.

For the account owner

Single sign-on is on the Agency, Studio, Growth and Network plans and works with any OpenID Connect provider (Okta, Microsoft Entra ID, Google Workspace, Auth0, OneLogin, JumpCloud, Keycloak) or any SAML 2.0 provider (ADFS, PingFederate, Shibboleth, and the same names in SAML mode). Set it up with POST /api/app/sso from your dashboard. OpenID Connect: issuer, client id, client secret if your provider issues one, and the email domains allowed in; redirect URI https://crawlcheck.io/sso/callback. SAML: "protocol":"saml" with your provider’s metadata URL; CrawlCheck’s own metadata is then at /sso/<slug>/saml/metadata.