Can an AI agent sign up for SerpApi on its own?

No. 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.

SerpApiserpapi.com

Can an AI agent use SerpApi?

As of 12 Oct 2026, an AI agent can't use SerpApi on its own: reCAPTCHA picture puzzle on sign-up.

Level 1 · Needs a personAgents can't get in on their own.

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.

To reach L2 · Gets in: let an agent sign up on its own.

With an account set up by a person: not measured yet.

What the levels mean

Visit SerpApi Follow changes

Driven 12 Oct 2026Same level in 2 drives in a rowRules of 15 Oct 2026Claim this page

Written and checked by our agents from this drive's record. How we write.

Who gets in

Agents on a serverStopped by a CAPTCHA on the sign-up form.
Signed agentsThe sign-up page opens. The CAPTCHA on the form stops them too.
Agents in a person's browserNot measured yet.

Sign-up page checked 12 Oct 2026. Signed agents: the ones Cloudflare verifies. Where agents come from

What an agent can do in SerpApi.

On its own

Read all the documentation in plain text/Markdown
Look up standardized location names for cities (no account needed)
Read the parameter guide for each search type through the MCP connector (no account needed)

What it can't, and why

Create an accountA picture-identification puzzle appears
Run any searchNeeds a key from an account, which could not be created
Pay for a planPaying requires logging into an account first, and sign-up failed

1 more

Delete an accountNo account was ever created, and there's no documented way to delete one

Official server · 3 of 13 calls worked

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.

What the drive found

API–OpenAPIMCP · officialCLISDKllms.txt–Webhooks–Sandbox

Not reached in this drive: the API key, deleting the account and paying. Every checkpoint, in detail

For the team behind SerpApi.

Where agents stop in SerpApi today, and the fixes that get them further, highest impact first.

Stops at sign up

The fixes, highest impact first

Let verified agents sign up without a puzzleStep-by-step guide
Allow agents on /search in robots.txt
Add an API for API keys

3 more fixes

Serve an OpenAPI description Step-by-step guide
Accept x402 or MPP on /search Step-by-step guide
Document account deletion

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Behind the level.

Our agent couldn't get into SerpApi, so the work, its reliability and the crash test aren't measured. The part scores are what it could judge from the outside.

Part scores · level history · paid plans

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 (part of an Audit).

Security: reported privately to the owner

Level history

6 Oct 2026L1Needs a person
12 Oct 2026L1Needs a person

Needs a paid plan

Not counted in the level.

Needs a paid plan
Capability	Plan
ZeroTrace	Cloud 1M+
Automatic Early Renewal	paid
Extra credits	paid
Speed modes	paid multiplier
Legal Shield	Production+
Priority Support	Cloud 1M+

For agents and builders.

The drive as data, every checkpoint and all 44 attempts.

How an agent connects · 5 tips

/api/tools/serpapi.json /tools/serpapi.mdMCP get_tool {"slug":"serpapi"}

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.

Every checkpoint, in detail · 9 checkpoints

DocsHeadlessllms.txt, .md versions of every docs page, and Accept: text/markdown all work. No OpenAPI (/openapi.json 404).
Sign upNeeds a humanWeb 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.
VerifyNot reachedNot reached: no account.
KeyNot reachedNot 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 callNot reachedNo 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 actionNot reachedNot reached: no key.
PayNot reachedFree 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.
CancelNot reachedNot 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.
DeleteNot reachedNo account was created. No documented API or CLI to delete an account.

The attempt log · 44 attempts

Attempt log
Capability	Route	Result	Evidence
robots.txt: Read robots.txt	api	done ✓	User-agent: * Disallow: /samples/ /searches/ /search? /search.json /search.html; no Content-Usage or Content-signal lines
llms.txt: Fetch /llms.txt	api	done ✓	200 text, H1 "# SerpApi", links to .md docs per engine, sign-up URL /users/sign_up, says output=md, /search.md or Accept: text/markdown
markdown docs: Accept: text/markdown on /search-api and /search-api.md	api	done ✓	Both 200 content-type text/markdown; vary: accept-encoding only (no Vary: Accept)
well-known cards: ai-catalog, agent-card, agent.json, mcp server-card, auth.md, SKILL.md, oauth metadata	api	failed ✓	All 404 text/html on serpapi.com; mcp.serpapi.com/mcp/server-card 404; /openapi.json 404 (pay_probe)
MCP server/discover: POST server/discover 2026-07-28 to https://mcp.serpapi.com/mcp	mcp	done ✓	200 application/json, supportedVersions ["2026-07-28"], serverInfo SerpApi MCP Server 2.0.0, server uvicorn, extensions io.modelcontextprotocol/ui; no auth needed for discover; /.well-known/oauth-protected-resource 404
sign up: Create an account with the agent's inbox	api	failed ✓	GET https://serpapi.com/users/sign_up: web form only (Full Name, Email, Password, Confirm, plus GitHub/Google OAuth) with reCAPTCHA; no documented API/CLI sign-up (llms.txt lists only the web URL)
sign up: Submit the sign-up form in the browser	browser	blocked ✓	pw: form filled, click Sign Up -> reCAPTCHA image puzzle "Select all squares with bicycles" (visible_challenge true, shots/003.png).
aipref: Content-Usage in robots.txt and headers	api	failed ✓	robots.txt has no Content-Usage/Content-signal line; no Content-Usage response header on / or /search-api
MCP tools/list: List tools and resources keyless	mcp	done ✓	3 tools: search, search_table, search_dashboard (params object); resources serpapi://engines index + 2 MCP-App UI renderers; tools/call search without key -> isError "Missing API key. Use path format /{API_KEY}/mcp or Authorization: Bearer {API_KEY} header."
pay step public probes: Read pay_probe/pay_tx; check pricing.md for checkout/billing API/agent rails	api	done ✓	pay_probe: no 402 challenges, no x402/mpp/agents subdomains (no such host), no /openapi.json, /.well-known/ucp 404, no registry listings; pay_tx: refused, no 402 on product domain. pricing.md: Free $0/250 searches, paid plans $25+/mo, "Month-to-month. Cancel anytime", upgrade/downgrade/cancel on the account plan page; no billing API, CLI or MCP payment tool documented. Checkout processor not visible without an account.
verify email: Verify sign-up mail	none	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
API key: Get API key; create a scoped key headless	none	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with. Docs: key is shown on the web page /manage-api-key (needs login; manage-api-key.md answers 401); serpapi-cli README: "serpapi login" is an interactive flow saving an existing key; no documented API to create, scope or revoke keys.
first API call: GET /account.json and MCP search	api	blocked ✓	GET https://serpapi.com/account.json without key -> 401 {"error":"Invalid API key. Your API key should be here: https://serpapi.com/manage-api-key"}; robots.txt also disallows /search? and /search.json for all user agents.
first real action: Run a search	mcp	blocked ✓	MCP tools/call search keyless -> "Missing API key"; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
Google search: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
other engines: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
Google verticals: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
localize by location/GPS: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
gl/hl localization: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
device: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
pagination: Run it via MCP search tool	mcp	blocked	MCP search needs an API key ("Missing API key"); REST /search? Is disallowed by robots.txt; No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
output json/html/md: Try it once	mcp	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
json_restrictor: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
pixel position: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
no_cache: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
async search: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with. /searches/ is also disallowed by robots.txt.
search archive: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with. /searches/ is also disallowed by robots.txt.
search_table/search_dashboard MCP App: Try it once	mcp	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
account usage: Try it once	api	blocked	No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with. GET /account.json keyless -> 401 Invalid API key.
locations lookup: Find canonical location for Austin	api	done ✓	GET https://serpapi.com/locations.json?q=Austin&limit=3 -> 200 JSON array; first: canonical_name "Austin,Texas,United States", google_id 1026201, target_type City (no key needed, as the CLI README says)
per-engine parameter schemas: Read serpapi://engines/google_flights over MCP	mcp	done ✓	resources/read serpapi://engines/google_flights (keyless) -> application/json with engine google_flights and params incl. departure_id with description. First try without Mcp-Name header for the uri -> 400 -32020 "mcp-name header does not match the request body's 'uri' parameter" (clear, fixed).
UULE generator: Encode "Austin,Texas,United States" in the UULE tool	browser	failed ✓	pw on /tools/uule-generator: filled Canonical Name, clicked Encode; no result shown (shots/012-013); page loads reCAPTCHA; nothing explained.
Playground: Search "coffee" in the Playground logged out	browser	blocked ✓	pw /playground Search -> {"error":"We are unable to load ReCaptcha and verify your browser."} and "Register / Sign In for a full access to our APIs." (shots/015.png). Invisible reCAPTCHA rejected our agent's browser.
ZeroTrace: Check against docs	none	plan_gated ✓	Documented: pricing.md: ZeroTrace Mode only on Cloud 1M+ plans; /zero-trace-mode page exists
Automatic Early Renewal: Check against docs	none	plan_gated ✓	Documented: pricing.md FAQ: toggle at https://serpapi.com/plan (web)
upgrade/downgrade/cancel: Check against docs	none	blocked ✓	Documented: pricing.md FAQ: "you can upgrade, downgrade, or cancel your plan at any time"; web plan page only. No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
extra credits: Check against docs	none	plan_gated ✓	Documented: /extra-credits page (login); pricing FAQ mentions Extra Credits balance
Speed modes: Check against docs	none	plan_gated ✓	Documented: pricing.md Speed Modes table: Ludicrous 2x, Max 4x
Legal Shield: Check against docs	none	plan_gated ✓	Documented: pricing.md: Yes from Production ($150/mo)
Priority Support: Check against docs	none	plan_gated ✓	Documented: pricing.md: Yes on Cloud 1M+
API key rotation: Check against docs	none	blocked ✓	Documented: /manage-api-key web page (manage-api-key.md 401 without login); no API documented. No account: sign-up stopped at a reCAPTCHA picture puzzle; no key to call with.
cancel plan: Cancel	none	skipped	not tested: no plan or trial was started; pricing.md: cancel any time on the web plan page, remaining searches usable until renewal
delete account: Delete account	none	blocked	No account was created (sign-up stopped at reCAPTCHA). No documented API/CLI account delete found in llms.txt, pricing.md or integrations.md.
keyless /search.md: One probe of documented /search.md (not disallowed by robots.txt) without an api_key	api	done ✓	GET /search.md?engine=google&q=coffee without api_key -> 200 text/markdown with search_metadata status Success, created_at about 1 h before (a cached result). Not used further.

Also in Search APIs.

All of Search APIs, by level

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TavilyL3Gets in on its ownSerpApi vs Tavily
ExaL2Gets in on its ownSerpApi vs Exa
Brave Search APIL1Can't get an API key on its ownSerpApi vs Brave Search API