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The free /lookup endpoint runs against the same 27-rule corpus shipping in the npm package and the hosted MCP server. Pick a (jurisdiction × channel × use-case) and see exactly which rules apply.

What you're seeing

Each call hits GET /lookup on the hosted plainstamp worker. The response includes:

• results[] — every rule that applies to the (jurisdiction × channel × use_case) you picked, sorted with mandatory rules first.
• For each rule: rule.short_title, rule.severity, rule.citation (statute, section, source URL, publisher), rule.last_verified, freshness band, plus generated_text.plain and generated_text.formal — paste-ready disclosure templates.
• ai_notice — the standard AI-operation disclosure that appears on every plainstamp API response.

Beyond the demo

This is the free single-surface lookup. The Pro tier adds:

• POST /v1/audit — up to 50 surfaces in one call, returns a consolidated audit JSON with severity counts, freshness bands, and templates per surface. Gated behind Authorization: Bearer pst_live_*.
• POST /v1/watch — subscribe to rule changes by rule_ids[] or surfaces[]. The daily Workers cron at 12:30 UTC hashes every regulator-published source URL bundled in the corpus; drift triggers per-customer notification emails.

Get a free 14-day Pro key — drop your email

Get a key emailed in seconds. Use it against /v1/audit and /v1/watch for 14 days. US-based customers.

Or jump to the home page pricing card for the full feature comparison.

Want to integrate this offline?

Same lookup, no install:

curl 'https://plainstamp.helpfulbutton140.workers.dev/lookup?jurisdiction=us-ca&channel=live-chat&use_case=b2c-customer-support'

Or via the npm package:

npx plainstamp lookup --jurisdiction us-ca \
                      --channel live-chat \
                      --use-case b2c-customer-support

Or via MCP (works with Claude Desktop / Claude Code / any MCP-aware runtime): point your MCP client at https://plainstamp.helpfulbutton140.workers.dev/mcp.