Call the stamp before you act.

Ten minutes

1. Read https://lodestarstamp.com/llms.txt
2. GET https://lodestarstamp.com/.well-known/mcp.json. Copy endpoints.trust.
3. Replace {domain} with a covered shop (example: oasisheating.com) and GET that URL.
4. Read receipt.fields. verified is what we attested on that date. claimed is asserted, not checked. not_published is not an attestation. Then you decide. We do not.

Optional header (never gates): X-Lodestar-Consumer: my-agent — a name you choose. Counts integrations. Does not change the receipt.

Cursor agent

In Cursor, fetch those three URLs. No plugin. No key. The file at `/.well-known/mcp.json` is a discovery card, not a Cursor MCP server — do not add it under Customize as MCP. Call `endpoints.trust`. Read `receipt.fields`. Then you decide.

Example

GET the card, then GET endpoints.trust with oasisheating.com in place of {domain}.

python3 -c 'import json,urllib.request; c=json.load(urllib.request.urlopen("https://lodestarstamp.com/.well-known/mcp.json")); u=c["endpoints"]["trust"].replace("{domain}","oasisheating.com"); r=urllib.request.Request(u, headers={"X-Lodestar-Consumer":"my-agent"}); print(urllib.request.urlopen(r).read().decode())'

Trimmed example JSON

{
  "api": "v1-draft-3",
  "draft": true,
  "independence": "Payment never touches the record. Receipts are free and public for every business.",
  "attribution": "Lodestar Stamp (lodestarstamp.com)",
  "payment_never_touches_record": true,
  "business": {
    "name": "Oasis Plumbing, Heating & Cooling",
    "domain": "oasisheating.com",
    "market": "chicago-hvac"
  },
  "receipt": {
    "fielded_on": "2026-08-24",
    "fields": {
      "real": { "state": "verified", "verified_on": "2026-08-24", "expires_on": "2026-11-22" },
      "at_that_address": { "state": "claimed" },
      "licensed": { "state": "verified", "verified_on": "2026-08-24", "expires_on": "2026-11-22" }
    }
  }
}

How to read a field

Each field that has an instrument is a small envelope: state, value, instrument, source_url, verified_on, expires_on, confidence. Fields with an instrument today: real, at_that_address, licensed. An absent key is coverage, not a fact about the shop.

States

• verified — we attested this on verified_on, through expires_on.
• claimed — the business asserted this; we have not checked it.
• unverifiable — we looked; the instrument cannot settle it.
• not_published — not an attestation. A hold and a never-looked row look the same.

If the shop is not in this edition: HTTP 404. Covered domains are listed from endpoints.index on the same card, or from https://lodestarstamp.com/index.json.

Do not

• Do not treat a 200 as approval to book.
• Do not rank shops from this payload.
• Do not pay us to move a field.
• Payment never touches the record.