# serper.dev.

level 3: structured interaction

Serper provides a Google Search API that delivers search results quickly and affordably. It allows developers to programmatically query Google search and receive results in 1-2 seconds. The API is priced starting at $0.30 per 1,000 queries.

## LEVEL 1 / BASIC ACCESSIBILITY

— 4/6

- Uses semantic HTML elements (header, nav, main, article, section, footer) instead of just divs: PASS
- Has proper meta tags (title, description, og:tags, twitter:card): PASS
- Includes Schema.org JSON-LD structured data: FAIL
- Does not block automated access with CAPTCHAs on public content: FAIL
- Content is server-side rendered (visible in HTML source, not just JS-rendered): PASS
- Uses clean, readable URLs (no excessive query params or hash fragments): PASS

## LEVEL 2 / DISCOVERABILITY

— 2/6

- Has a robots.txt that allows legitimate bot access: FAIL
- Provides an XML sitemap: FAIL
- Has a /llms.txt file describing the site for LLMs: FAIL
- Publishes an OpenAPI/Swagger specification for its API: FAIL
- Has comprehensive, machine-readable documentation: PASS
- Primary content is text-based (not locked in images/videos/PDFs): PASS

## LEVEL 3 / STRUCTURED INTERACTION

— 5/6

- Provides a structured REST or GraphQL API: PASS
- API returns JSON responses with consistent schema: PASS
- API supports search and filtering parameters: PASS
- Has an A2A agent card at /.well-known/agent.json: FAIL
- Rate limits are documented and return proper 429 responses with Retry-After: PASS
- API returns structured error responses with error codes and messages: PASS

## LEVEL 4 / AGENT INTEGRATION

— 2/6

- Provides an MCP (Model Context Protocol) server: FAIL
- Supports WebMCP for browser-based agent interaction: FAIL
- API supports write operations (POST/PUT/PATCH/DELETE), not just reads: PASS
- Supports agent-friendly authentication (API keys, OAuth client credentials): PASS
- Supports webhooks for event notifications: FAIL
- Write operations support idempotency keys: FAIL

## LEVEL 5 / AUTONOMOUS OPERATION

— 2/6

- Supports event streaming (SSE, WebSockets) for real-time updates: PASS
- Supports agent-to-agent capability negotiation: FAIL
- Has a subscription/management API for agents: FAIL
- Supports multi-step workflow orchestration: PASS
- Can proactively notify agents of relevant changes: FAIL
- Supports cross-service handoff between agents: FAIL