Propraven

@propraven/mcp

Model Context Protocol server for PropRaven — gives Claude, ChatGPT, Cursor, and any MCP-compatible agent canonical access to 191.3M US parcels (110.0M mapped) with ownership, valuation, permits, deeds, hazard, and market data.

Hosted endpoint: https://propraven.com/mcp (Streamable HTTP, no install — docs: https://propraven.com/docs/mcp · agents + x402: https://propraven.com/docs/agents). Or run the stdio server locally (below).

Hosted (no install)

Point any HTTP-transport MCP client at `https://propraven.com/mcp` with your API key as a bearer header. Claude Desktop / Cursor (claude_desktop_config.json, ~/.cursor/mcp.json):

{

"mcpServers": { "propraven": { "url": "https://propraven.com/mcp", "headers": { "Authorization": "Bearer pz_your_real_key_here" } } } }

Claude Code: claude mcp add --transport http propraven https://propraven.com/mcp --header "Authorization: Bearer pz_your_real_key_here". The claude.ai web connector uses OAuth instead — add a custom connector with the same URL and sign in.

Local stdio server (npx @propraven/mcp)

Requirements: Node ≥18, a PropRaven API key (pz_…) from https://propraven.com/settings/api-keys (free, no card).

Claude Desktop — edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{

"mcpServers": { "propraven": { "command": "npx", "args": ["-y", "@propraven/mcp"], "env": { "PROPRAVEN_API_KEY": "pz_your_real_key_here" } } } }

Cursor (~/.cursor/mcp.json) takes the same block. Claude Code: claude mcp add propraven --env PROPRAVEN_API_KEY=pz_your_real_key_here -- npx -y @propraven/mcp.

Restart the client. The 8 PropRaven tools appear in the tool list.

Quick test

Look up parcel 37:119:12104406 and tell me the owner.

The agent should pick parcel_lookup and return the canonical parcel card with the owner.

ChatGPT: Custom GPT → Actions → OpenAPI URL https://api.propraven.com/openapi.json with API-key (Bearer) auth; native MCP-in-ChatGPT can use the hosted endpoint https://propraven.com/mcp (OAuth 2.1 + PKCE).

Tools

Names match the hosted server (^[a-zA-Z0-9_-]{1,64}$, as MCP clients and the Anthropic API require).

Parcel IDs. The canonical form is state_fips:county_fips:parcel_id, e.g. 37:119:12104406. The legacy 5-digit form (37119:12104406) and PropRaven parcel UUIDs are also accepted. parcel_search and parcel_lookup's address search add a lookup_id to every result (search rows carry the PropRaven UUID in parcel_id), which parcel_lookup / parcel_compare accept.

No tool spends money. The client only issues GETs to the seven free / metered read endpoints above, refuses every other path before a request is sent (the paid parcel report, comp pack, risk score, owner report, leads, storefront, …), and never sends a payment header. If the API ever answers with an x402 402 Payment Required, the tool returns 402 payment required — this tool never pays. Calls still count against your plan's monthly quota. To buy a dossier, use the hosted server's explicit buy_* tools or propraven.com.

Errors are RFC 7807 problem details, surfaced as : (e.g. 404 not_found: …). A 429 or 503 is retried once when Retry-After is ≤ 10 s.

Tool descriptions call out when not to use each tool, which is the biggest determinant of agent selection accuracy.

Environment

Requests carry User-Agent: @propraven/mcp/ .

Develop / inspect

npm ci

npm run build npm test # node:test suite — no network, no API key needed

Live-reloading dev (TypeScript, no build step):

PROPRAVEN_API_KEY=pz_test... npm run dev

Or open the MCP Inspector UI:

PROPRAVEN_API_KEY=pz_test... npm run inspect

The inspector at https://modelcontextprotocol.io/legacy/tools/inspector lets you call each tool manually and see request/response payloads.

Why this exists

Every Claude / ChatGPT / Cursor workflow that touches property data needs an authoritative parcel-lookup tool. There is no canonical property-data MCP today. PropRaven aims to be it before the first-mover window closes (~12–18 months).

License

Apache-2.0