Observed arrival · 2026-10-17

Until: a watch API that sends receipts

untilapi.com Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

Until lets an agent watch a webpage for a defined condition and receive a signed receipt when it becomes true.

Landing page captured for the 2026-10-17 issue.

For: AI agents and tools monitoring webpage changes
Worth noticing: Each matched receipt includes the matched value, timestamp, and content hash, and is HMAC-signed.

Field notes

The API accepts a URL and a deterministic condition, then offers polling or an HMAC-signed webhook for a match. Its free dry-run fetches a page once and is limited to 30 checks per hour per IP. The page says watches can be refused for reasons including JavaScript-only pages, bot blocking, robots.txt restrictions, or unreachable pages; those refusals are not charged.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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