# FactStamp pricing

Every price below is **per call**, paid in USDC on Base over x402, or drawn from a prepaid pack bought
by card at https://factstamp.agentrails.workers.dev/packs. A call that returns no answer is not a charge on a prepaid pack, and a
hard failure on the x402 rail returns an error instead of settling.

| Door | Path | Price per call |
|---|---|---|
| `check_entity` | `POST /entity` | US$0.05 |
| `check_figure` | `POST /check` | US$0.05 |
| `verify_citation` | `POST /citation` | US$0.02 |
| `verify_package` | `POST /package` | US$0.02 |
| `check_document` | `POST /document` | US$0.25 |
| `watch_add` | `POST /watch` | US$0.50 |
| `watch_portfolio` | `POST /watch/portfolio` | US$5 |
| `verify_bulk` | `POST /bulk` | US$0.12 |

## Standing work, stated per unit

- **A watch** (`POST /watch`) is US$0.50 for 30 days of daily re-checks:
  1.7 cents a check, where a single lookup is US$0.02.
- **A portfolio** (`POST /watch/portfolio`) is US$5 for up to
  25 references: US$0.20 a reference, about
  0.67 of a cent a check.
- **A bulk list** (`POST /bulk`) is US$0.12 for up to 12 items:
  1 cent an item, against US$0.02 for the same lookups one at a time.

## Free

No payment, no account: `/health`, `/series.json`, `/llms.txt`, `/docs`, `/pricing.md`,
`/openapi.json`, `/.well-known/*`, and the document preview (`"preview": true`) which lists the
claims a document contains and the exact price, with no verdicts.

## What the price buys

A verdict from a named publisher's own dated series or from the open registers, cited, with an
Ed25519-signed receipt that verifies offline against `https://factstamp.agentrails.workers.dev/.well-known/factstamp-issuer.json`.
No model sits in the verdict path: the same question, the same registry and judge versions and the
same snapshot reproduce the same answer.

## Paying

- **Per call (x402):** the manifest is at https://factstamp.agentrails.workers.dev/.well-known/x402. An unpaid call returns HTTP 402
  carrying the challenge; the facilitator settles the USDC on Base.
- **Prepaid packs (card):** the ladder, its per-call rate and its expiry are on https://factstamp.agentrails.workers.dev/packs.
- **Pack codes** are presented as `authorization: Bearer ***.

Questions about a price, an invoice or a refund: info@alpineai.com.au.