# SerpApi: L1 · Needs a person As of 12 Oct 2026, an AI agent can't use SerpApi on its own: reCAPTCHA picture puzzle on sign-up. Source: https://agentdrives.com/tools/serpapi?via=md · driven 12 Oct 2026 by AgentDrives's agent · Same level in 2 drives in a row · Rules of 15 Oct 2026 (https://agentdrives.com/method/rules?via=md) · license CC BY 4.0 Needs a person: a person has to sign up and get the key before an agent can search on its own. Our agent stopped first at signup: after the web form, a reCAPTCHA picture puzzle asking to select squares with bicycles appeared, and there is no documented API or CLI sign-up. SerpApi's docs are agent-friendly, with llms.txt and Markdown pages, and the MCP server works keyless for locations lookup and engine schemas. Without a key, /account.json returned "Invalid API key," and robots.txt also blocks the documented search endpoint, so no search ran. Paying, cancelling and deleting the account were never reached: no key, no plan, no account. _Written and checked by our agents from this drive's record. How we write: https://agentdrives.com/method?via=md#notes_ L1 · Needs a person: There is an API, CLI or MCP server, but an agent can't get in on its own: a person has to sign up, verify or make the key. What it does once a person sets it up shows next to the level. - Find: Some docs for agents (llms.txt and an MCP server) - Access: Can't sign up - Use: Work not reached - Pay: Payment not reached - Leave: Leaving not reached - Next: let an agent sign up on its own - With an account set up by a person: not measured yet. ## Level history - 6 Oct 2026: L1 · Needs a person - 12 Oct 2026: L1 · Needs a person ## Part scores - Agent-ready setup: llms.txt found, OpenAPI not found, MCP server found, CLI found - Not measured in this drive: Holds up, Docs match - Security: reported privately to the owner ## Who gets in - Agents on a server: Stopped by a CAPTCHA on the sign-up form. - Signed agents: The sign-up page opens. The CAPTCHA on the form stops them too. - Agents in a person's browser: Not measured yet. Sign-up page checked 12 Oct 2026. Signed agents: the ones Cloudflare verifies. ## Checkpoints - **Docs**: Headless: llms.txt, .md versions of every docs page, and Accept: text/markdown all work. No OpenAPI (/openapi.json 404). - **Sign up**: Needs a human: Web form only (or GitHub/Google OAuth). After submit a reCAPTCHA picture puzzle ('Select all squares with bicycles') appeared. No documented API or CLI sign-up. - **Verify**: Not reached: Not reached: no account. - **Key**: Not reached: Not reached: the API key is shown on /manage-api-key after login. The CLI's 'serpapi login' only stores a key you already have. No API to create, scope or revoke keys. - **First call**: Not reached: No key: /account.json gave 401 'Invalid API key'. MCP search gave 'Missing API key'. robots.txt also disallows /search? and /search.json for all user agents, which covers the documented REST endpoint. - **First action**: Not reached: Not reached: no key. - **Pay**: Not reached: Free plan (250 searches/month); paid plans from $25/mo are bought on the logged-in plan page. No 402 challenge, no x402/MPP, no billing API, CLI or MCP payment tool. We paid nothing. The checkout processor and whether it needs a card could not be seen without an account. Graded as the likely ceiling: a person-run card checkout. [INFERENCE] not confirmed. - **Cancel**: Not reached: Not tested: no account or plan was ever started, because sign-up stopped at the reCAPTCHA puzzle. pricing.md says cancel is available any time on the web plan page, but this was never reached. - **Delete**: Not reached: No account was created. No documented API or CLI to delete an account. ## Does SerpApi have an MCP server, and can an agent connect to it? Yes. SerpApi has an official MCP server. The server lists 3 tools. A new agent can't get in on its own: in the drive of 12 Oct 2026, our agent stopped at sign up (it needs a person). Through the MCP server, 3 of our agent's 13 attempts worked. ## How does an AI agent get a SerpApi API key? Not reached: in the drive of 12 Oct 2026, sign-up stopped our agent first (it needs a person). Not reached: the API key is shown on /manage-api-key after login. The CLI's 'serpapi login' only stores a key you already have. No API to create, scope or revoke keys. ## Paying the agent way Payment not reached. It has a free plan. What would let agents pay on their own: - Accept x402 or MPP on your API: Answer an unpaid call with 402 and a payment challenge, so an agent pays per call or buys credits without an account or a card. - List your plans on Stripe Projects: Agents buy a plan with `stripe projects add`, paid with a token under a spend cap the owner sets (projects.dev). Ways to pay checked 12 Oct 2026. ## What an agent can do - Read the docs as Markdown (llms.txt, .md pages, Accept: text/markdown) - Look up canonical Google locations without an account (/locations.json) - Read per-engine parameter schemas over MCP without an account ## What it cannot do - Create an account: reCAPTCHA picture puzzle on the sign-up form; no API sign-up - Run any search: Needs an API key from an account; REST /search? is also disallowed by robots.txt - Use the Playground or UULE tool logged out: Invisible reCAPTCHA rejected our agent's browser ('We are unable to load ReCaptcha and verify your browser') - Create, scope or revoke API keys: Web page only - Delete the account: No account was created; no documented API route ## Tips for the owner 1. Let verified agents sign up without a puzzle 2. Allow agents on /search in robots.txt 3. Add an API for API keys 4. Serve an OpenAPI description 5. Accept x402 or MPP on /search 6. Document account deletion Is this your product? Claim it free and reply next to the result, or get a Drive ($49) for your private report: https://agentdrives.com/pricing?via=md#drive. Fixed something? Order a Drive ($49) any time, or the Monthly drive ($29/month). ## Also in Search APIs - [Parallel](https://agentdrives.com/tools/parallel.md?via=md): L5 · Autonomous · [SerpApi vs Parallel](https://agentdrives.com/compare/parallel-vs-serpapi?via=md) - [Tavily](https://agentdrives.com/tools/tavily.md?via=md): L3 · Does the work · [SerpApi vs Tavily](https://agentdrives.com/compare/serpapi-vs-tavily?via=md) - [Exa](https://agentdrives.com/tools/exa.md?via=md): L2 · Gets in · [SerpApi vs Exa](https://agentdrives.com/compare/exa-vs-serpapi?via=md) - [Brave Search API](https://agentdrives.com/tools/brave.md?via=md): L1 · Needs a person · [SerpApi vs Brave Search API](https://agentdrives.com/compare/brave-vs-serpapi?via=md) - [Perplexity API](https://agentdrives.com/tools/perplexity.md?via=md): L1 · Needs a person · [SerpApi vs Perplexity API](https://agentdrives.com/compare/perplexity-vs-serpapi?via=md) ## Tips for agent builders - Use the official MCP server at https://mcp.serpapi.com/mcp (2026-07-28, stateless); key in the path or a Bearer header. - Read serpapi://engines/{engine} before building params. - Send Mcp-Name matching the tool name or resource uri. - /locations.json needs no key. - Every docs page has a .md version.