Corpus Law
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Search and cite US federal, state, and municipal law with verbatim citations, then run LLC/nonprofit formation intake — free agent-native tools on a remote Streamable HTTP endpoint.
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Give any AI agent US law with real citations — and the power to prepare a real LLC or nonprofit filing for its user, with a human at Corpus reviewing the exact payload before anything is submitted to the state. Free tool calls.
Live right now:551,201provisions indexed and searchable. That number is read from the same rolluplaw.list_coveragereturns —check it yourself.
Also listed onSmitheryascorpus-legal— one-click install for MCP clients that use the directory.
claude mcp add --transport http corpus https://corpuslaw.us/api/mcp
Project-scoped.mcp.json(commit it, the whole team gets it), Cursor (.cursor/mcp.json), or any JSON-config client:
{ "mcpServers": { "corpus": { "type": "http", "url": "https://corpuslaw.us/api/mcp" } } }
Claude Desktop / claude.ai: Settings → Connectors → Add custom connector → paste the URL. Older stdio-only clients:npx mcp-remote https://corpuslaw.us/api/mcp. Everything else (Windsurf, Zed, MCP Inspector, custom agents): it's a standard Streamable HTTP server — stateless JSON-RPC, no OAuth, no sessions, so it works from serverless and CI too.
Auth:none required. Anonymous callers get 100 searches a month at 10 req/min, per IP. Add"headers": { "Authorization": "Bearer cp_…" }to the server config for1,000 searches a month at 30 req/min, renewing on the 1st — free API keys are self-serve and instant at/settings, with no review step and no expiry.Form a company through Corpus and your key permanently gets 5,000 searches a month at 60 req/min— applied automatically once the filing is accepted, nothing to claim. Past the free allotment, research is $0.005 per search from prepaid credits (as low as $0.0033 in the larger packs), and the monthly allotment stays yours after you add a card.Every formation tool andaccount.statusis always free— no research quota can block a formation order. Keys and credits are shared with theREST API.
Tools (server v1.2.1 — generated from the live registry)
counts against the monthly free allotment (1,000 with a key, 100 anonymous); $0.005 each beyond it. Every tool is read-only exceptaccount.status, which mints your referral code. No tool charges for a formation; the only way MCP traffic can bill a card is auto-recharge for research credits, which is opt-in and off by default.
- law.list_coverage— confirm the jurisdiction is searchable (aPLACEHOLDERrow means an empty search is expected, not a bug).
- law.searchwith{ query, jurisdiction: "MS" }— ranked provisions, each with a citation and anode_id.
- law.get_nodewith thenode_id— the full section text, itseffectiveDatewhen set, and aprovenancearray recording when Corpus last pulled each source.
- Answer citing the returnedcitationstring verbatim — tool output is the only citation source.
Walkthrough — form an LLC from your agent
Your agent is the intake agent: it collects everything in its own conversation (free calls), then hands the user one link. Nothing is re-asked on our side.
Privacy by construction:the draft travels in the URLfragment*(#prefill=), which never leaves the browser — no PII in server or CDN logs. No SSN field exists anywhere in the tool schemas; the founder enters it in a secure panel at checkout, never in chat.
curl -s https://corpuslaw.us/api/mcp -H 'content-type: application/json' -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "law.search", "arguments": { "query": "food truck permit", "jurisdiction": "MS", "limit": 3 } } }'
One JSON-RPC message per POST; batches supported. Errors:-32002monthly allotment used up and wallet empty (add a card or credits at/settings, or wait for next month),-32003rate limit (back off, or raise 10 → 30 req/min with a free key). Tool-level problems come back as normal results withisError: trueand a plain-English message your model can act on.
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