---
title: "Compare a retained-evidence checkpoint for free"
method: POST
path: "/api/agent/v1/checkpoint"
---

# Compare a retained-evidence checkpoint for free

`POST /api/agent/v1/checkpoint`

## Request

- Base URL: `https://californiabitcoin.org`
- URL: `https://californiabitcoin.org/api/agent/v1/checkpoint`
- Auth: none required

FREE, no account and no payment. Compare a previously returned retained-evidence checkpoint with the current maintained dossier content identity before deciding whether to rerun or repurchase covered historical research.

## Request body

- object
  - `checkpointId` string, required
  - `expectedDigest` string, required

## Response `200`

Structured deterministic California Bitcoin knowledge result

- object
  - `operation` string, required
  - `productId` string, nullable
  - `access` 'free' | 'paid', required
  - `price` object, required
    - `currency` string
    - `amountCents` integer
  - `result` object, required
  - `paymentReceipt` object

## Other responses

- `400`: Invalid input

---

[API](https://skmtc.dev/californiabitcoin/apis/california-bitcoin-agent-commerce-api.md) · [All operations](https://skmtc.dev/californiabitcoin/apis/california-bitcoin-agent-commerce-api/llms.txt) · [OpenAPI document](https://skmtc.dev/californiabitcoin/apis/california-bitcoin-agent-commerce-api/revisions/13683fe699bc?raw)