Headlessly

The full API reference for headless.ly. For entity documentation, see the Entities tab.

Interfaces

Five projections of the same verb system:

TypeScript SDK — the primary interface for agents and developers.

Three tools for AI agents: search, fetch, do.

Terminal interface mirroring the SDK.

HTTP endpoints for any client.

The Noun() function, typed schemas, zero dependencies.

qualify() / qualifying() / qualified() / qualifiedBy — full lifecycle.

Immutable event log, time travel, CDC.

Layer stack from Cloudflare to SDK.

Truth source for all Billing entities and financial metrics.

Truth source for all Projects entities.

Forward events to GA, Sentry, PostHog while building the lakehouse.

Numerics, Grafana, Retool, and any BI tool.