About

FactStamp is a small, machine-facing verification service: an agent asks whether a company, a figure or a citation is what it claims to be, pays a few cents, and gets back a cited, dated answer with a receipt that can be checked offline by somebody who was not here.

What it is for

Agents are increasingly asked to name a company in a contract, quote a number in a deck, or repeat a citation in a document. Those are the moments where a confident wrong answer is expensive. The service exists for that moment, and for the standing version of it: a list of references or a single claim that has to stay true for a month, re-checked daily, reported only when something changes.

Who runs it

FactStamp is operated by Alpine AI, a small Australian business in Victoria. Support, takedown requests and questions about a bill go to info@alpineai.com.au, and we answer them.

How it is paid for

Per call, in USDC on Base over the x402 protocol, or by card for a prepaid pack of calls. There is no subscription, no account and no invoice: the prices and the rules are on /pricing.md.

What it refuses to do

• No model in the verdict path. Answers come from named publishers' own series and from open registers. A language model is not asked what the truth is.
• Unknown is a real answer. When a source cannot be read, or the claim is outside coverage, we say so rather than guess, and we do not charge a prepaid pack for it.
• No personal data. We do not want names, health, financial or identifying details. See privacy.
• Not a screen. This is not a credit check, a sanctions screen or a background check, and it is not advice. See terms.

Checking our work

• Every paid answer carries an Ed25519 receipt; the public key is at /.well-known/factstamp-issuer.json and verification is offline and free.
• Machine-readable everything: /llms.txt, /openapi.json, x402 manifest, coverage.
• Whats covered, and what is deliberately out of scope, is pinned by a registry version so it cannot drift silently.

Version 0.1.0. Last updated 29 September 2026. Support and takedown requests: info@alpineai.com.au