DELTA Witness · Trust Layer for Autonomous Actions

Record public terms immediately before a purchase

Capture price, refund, cancellation, or service terms before software authorizes a consequential purchase.

The failure mode

Checkout automation often depends on public terms that can change independently of the buyer's workflow. A later screenshot cannot establish which page state the automation actually evaluated.

Machine workflow

Use Guard with explicit required and forbidden text, or compare against a prior DELTA proof. The returned timestamp, hashes, observed status, and deterministic diff can travel with the purchasing system's audit record.

POST https://delta-witness-api.ruphussten.workers.dev/v1/preflight
content-type: application/json

{"url":"https://example.com/terms","expected":{"contains":["Refund window: 30 days"]}}

Evidence boundary

A matching observation is not legal advice, merchant endorsement, or proof that off-page promises will be honored. It is a bounded record of the public source DELTA observed.

Read the API guide · OpenAPI 3.1 · Live Guard quote