# IndexZero documentation > The manual for IndexZero, the SEO platform built for AI agents: how to connect an agent over MCP, what every tool does and costs, how credits and plans work, and the machine-readable reference. Every page here is also available as markdown by appending `.md` to its URL, or by requesting it with `Accept: text/markdown`. The product itself runs at https://app.indexzero.site; the MCP endpoint is https://app.indexzero.site/mcp. The product-level index (what IndexZero is for, when to use it, the full tool catalog) is at https://indexzero.site/llms.txt. ## Start here - [IndexZero documentation](https://docs.indexzero.site/): IndexZero is the SEO platform built for AI agents. Keyword research, rank tracking, site audits, backlinks, and AI-visibility measurement, callable over MCP by Claude, ChatGPT, Cursor, or anything you build, and by you in the dashboard. - [Getting started](https://docs.indexzero.site/getting-started): Create an account, point a project at your domain, run your first research, and connect an agent. - [How credits work](https://docs.indexzero.site/credits): Credits pay for live search data. Roughly 1,000 credits is one dollar of provider spend. Anything that reads your own data is free. - [Plans and limits](https://docs.indexzero.site/plans): What each plan includes, the limits it enforces, and the top-up packs. ## Connect an agent - [Connecting an agent](https://docs.indexzero.site/agents): One MCP endpoint, two ways to authenticate. Which to use, what the agent gets, and what it is told about cost. - [Claude Code](https://docs.indexzero.site/agents/claude-code): Add IndexZero to Claude Code with one command and approve it in the browser. - [Claude desktop and web](https://docs.indexzero.site/agents/claude): Add IndexZero as a custom connector in Claude's settings. - [Cursor](https://docs.indexzero.site/agents/cursor): Add IndexZero to Cursor with a four-line mcp.json. - [ChatGPT](https://docs.indexzero.site/agents/chatgpt): Add IndexZero to ChatGPT as a connector so it can call the tools in a conversation. - [Codex](https://docs.indexzero.site/agents/codex): Register IndexZero with the Codex CLI. - [Any other client](https://docs.indexzero.site/agents/other-clients): The generic configuration for Hermes, OpenClaw, and anything else that speaks MCP, plus calling the endpoint directly. - [API keys](https://docs.indexzero.site/agents/api-keys): Workspace keys for scripts and clients without a browser. Format, headers, limits, and what a key cannot do. - [OAuth](https://docs.indexzero.site/agents/oauth): How interactive clients authorize, what the scopes mean, token lifetimes, and the discovery endpoints. ## Using IndexZero - [Projects and markets](https://docs.indexzero.site/guides/projects): What a project holds, how its market drives every tool, and how archiving works. - [Connecting Google and PostHog](https://docs.indexzero.site/guides/integrations): Read-only access to Search Console, Google Analytics 4, and PostHog, connected per project. All reads are free. - [Rank tracking in the dashboard](https://docs.indexzero.site/guides/rank-tracking): Create a tracker, understand the cost line, choose a schedule, and read the results. - [Site audits in the dashboard](https://docs.indexzero.site/guides/site-audits): Launch a crawl, watch it run, and work through the issues. - [AI visibility in the dashboard](https://docs.indexzero.site/guides/ai-visibility): Brand lookup and the prompt explorer, on Starter and above. - [SAM](https://docs.indexzero.site/guides/sam): The SEO teammate built into the app, on Pro and above. - [Account, billing, and data](https://docs.indexzero.site/guides/account): Signing in, the billing page, what is kept, and how to delete things. ## Tool reference - [Tool reference](https://docs.indexzero.site/tools): Every MCP tool, grouped the way an agent works through them, with what each costs. - [Workspace](https://docs.indexzero.site/tools/workspace): Orient a session. Who am I, which projects exist, create one. - [Keyword research](https://docs.indexzero.site/tools/keyword-research): Turn seeds into scored keywords, look up metrics for a list you already have, and save the ones worth keeping. - [Domains and backlinks](https://docs.indexzero.site/tools/domains-and-backlinks): Size up any domain, yours or a competitor's. Traffic, ranked keywords, top pages, SERP competitors, and the link profile. - [Local search](https://docs.indexzero.site/tools/local-search): Google Business listings, Maps and Local Finder rankings, and the questions people ask on a listing, at a coordinate. - [Rank tracking](https://docs.indexzero.site/tools/rank-tracking): Create trackers, estimate a check before running it, add and remove keywords, and read positions over time. - [Site audits](https://docs.indexzero.site/tools/site-audits): Crawl your own site for technical and on-page issues, with Lighthouse on a sample of pages. - [Search Console and Google Analytics](https://docs.indexzero.site/tools/search-console-and-analytics): Your own measured search performance and what visitors did next. Free, because it is your data. - [PostHog](https://docs.indexzero.site/tools/posthog): Sessions, pages, acquisition, events, and conversions from a connected PostHog project. Free. - [AI visibility](https://docs.indexzero.site/tools/ai-visibility): Whether assistants mention and cite a brand, share of voice against competitors, and what the same prompt gets from four models. ## Reference - [Machine-readable reference](https://docs.indexzero.site/reference/machine-readable): Every fixed URL an agent can read to learn what IndexZero is and how to call it, without rendering a page. - [Errors](https://docs.indexzero.site/reference/errors): The error shapes on each layer, the codes that matter, and what an agent should do with each. - [Audit issue types](https://docs.indexzero.site/reference/audit-issue-types): Every check a site audit runs, what each means, and how to fix it. - [Limits](https://docs.indexzero.site/reference/limits): Every numeric limit in one place. Plan limits, per-call maximums, rate limits, and lifetimes. ## Optional - [All pages in one file](https://docs.indexzero.site/llms-full.txt): every page of this manual, concatenated. - [OpenAPI document](https://indexzero.site/openapi.json): the MCP endpoint and OAuth security schemes, OpenAPI 3.1. - [MCP manifest](https://indexzero.site/.well-known/mcp.json): endpoint, transport, authentication, and tool groups. - [Tool catalog](https://app.indexzero.site/api/mcp/catalog): every tool with JSON Schema for its arguments, unauthenticated.