@postcept/demo

Run broken-refund scenarios through Postcept's verification engine, in your terminal:

npx @postcept/demo

Each scenario (a Stripe call that timed out before the write, a retry that refunded twice, a settlement still pending, a wrong amount, a provider outage, an unknown provider status) runs through the real engine and shows what the agent claimed, what the system of record held, and what Postcept concluded: the outcome, the lifecycle, and whether it is safe to tell anyone the work is done.

No account, no setup. The engine is the production one, reached through the public playground endpoints. The ledger is example data. Receipts come back Ed25519 signed with test: true in the signed body, so you can verify one at https://postcept.com/verify.

npx @postcept/demo --list        # scenarios
npx @postcept/demo duplicate     # run one

Web version: https://postcept.com/lab