DELTA Witness · Trust Layer for Autonomous Actions

Detect and certify changes to a public source

Use finite prepaid Watch checks to observe a public policy, specification, price page, or machine-readable source on a controlled schedule.

The failure mode

Unbounded free polling creates open-ended cost and weak incentives. Teams still need a reliable signal when a source that controls downstream actions changes.

Machine workflow

A billing platform or reseller prepays a finite quota through the authenticated partner gateway. DELTA checks no more often than every 15 minutes, sends HMAC-signed webhooks, decrements quota, and pauses when the prepaid unit price falls below the live cost floor.

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

Watch reports observed change, not real-world truth. Raw HTML, Markdown, and screenshots remain private; public verifier pages expose metadata and hashes only.

Read the API guide · OpenAPI 3.1 · Live Guard quote