MERCATOR Entity Evidence

Company facts with the receipts attached. Ask for legal name, headquarters, founded year, employee count, executives or funding for a domain and get each field back with its source URL, a verbatim excerpt from that page, when it was retrieved, and n-of-m source agreement. Conflicting sources are returned, not hidden. A field that cannot be evidenced comes back UNKNOWN rather than guessed, and a company that cannot be resolved is STILL CHARGED FOR. That is a defect measured 2026-09-30, not a policy: settlement cancellation does not work under the x402 exact scheme, and a fix is in progress. It affects only the no-evidence cases; every other call is charged once at the listed price. This text is dated: if it still says a fix is in progress after 2026-10-14, the fix has stalled and this sentence is the stale one. Paid per call over x402 on Base ($0.10 USDC), with a free preflight. You pay from your own wallet — see "Who pays" below. Triggers: "what is the legal name of X", "verify this company", "enrich this domain with sources", "who runs X and where is it based".

Company enrichment where the answer carries its own evidence. The point is not the value — plenty of APIs return a legal name. The point is that you can see where it came from and decide whether to believe it.

Who pays, and from which wallet

Your wallet, not ours and not the platform's. This skill carries no wallet, custodies nothing and never asks for a private key. It describes a paid HTTP endpoint; your agent pays for the call the way it pays for any other x402 resource — an x402 skill holding a funded key, a bounded agent wallet, or an X-PAYMENT header you pre-sign yourself. With no x402 signer configured the free preflight still works and the paid route keeps returning 402.

An unresolvable company is STILL CHARGED FOR — a defect measured 2026-09-30, not a policy, with a fix in progress. It affects only the two no-evidence cases (UNRESOLVED, INSUFFICIENT_EVIDENCE); every other call is charged once at the listed price. Read the X-MERCATOR-Charged header for what actually moved. This text is dated: if it still says a fix is in progress after 2026-10-14, the fix has stalled and this sentence is the stale one.

The shape of the call

bash

BASE="${MERCATOR_BASE_URL:-https://mercator-entity-evidence.fly.dev}"

# Free preflight — which fields will be attempted, and the price if you buy.
curl -sS -X POST "$BASE/v1/entity-evidence/validate" \
  -H 'content-type: application/json' \
  -d '{"domain":"lido.fi","fields":["legal_name","primary_domain"]}' | jq .

# Paid answer — $0.10 USDC on Base, x402.
curl -sS -X POST "$BASE/v1/entity-evidence" \
  -H 'content-type: application/json' \
  -H "X-PAYMENT: $X_PAYMENT" \
  -d '{"domain":"stripe.com","fields":["legal_name","headquarters","founded_year"]}' | jq .

field	required	meaning
fields	yes	which of the supported fields to attempt
domain	one of	the company's domain
name	one of	the company's name, when you have no domain
max_age_days	no	freshness bound, default 30

Supported fields: legal_name, primary_domain, headquarters, industry, key_executives, last_reported_funding, founded_year, employee_count.

What you are paying for

These are the service's own guarantees, returned verbatim by the free preflight above — read live on 2026-09-13:

• every returned field carries value, source URL, verbatim excerpt, retrieved_at, confidence and n-of-m source agreement
• excerpts are verified against the fetched document before return
• conflicting sources are returned, not hidden
• fields that cannot be evidenced are returned UNKNOWN, never guessed
• an unresolvable company is still charged for — a defect measured 2026-09-30 with a fix in progress, affecting only the no-evidence cases. This text is dated: if it still says a fix is in progress after 2026-10-14, the fix has stalled and this sentence is the stale one.

Honest limits

• Coverage is what the open web publishes. A company with no reachable public record returns UNKNOWN fields, and that is the honest answer rather than a plausible one.
• A verbatim excerpt is evidence of a claim, not proof of a fact. A registry, a company's own site and a news page can all be wrong; what this guarantees is that the quote is really on the page it names.
• Conflicts are surfaced, not resolved. When credible sources disagree you get both readings — deciding between them is yours.

Price

POST /v1/entity-evidence	$0.10 USDC, Base (eip155:8453), x402 exact
POST /v1/entity-evidence/validate	free
asset	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC on Base)
payTo	0xEFc22716066C1092b12d12ca9377f00bA2ffA7A8

Price, network, asset and payee above were read from the live 402 challenge on 2026-09-13, not from documentation. No signup, no API key, no account.

Companion skill

mercator-address-evidence — the same discipline applied to contract addresses before you transact, at $0.25.