Changelog

The version is in the path (/api/v1/). What that promises, and what it does not.

What will not change within v1

Existing field names and their meaning.
Existing error codes and which HTTP status they carry.
Existing filter parameters — including the level-dependent behaviour documented on the filter page.
The shape of pagination and billing.

New fields, groups and filters. Parse defensively: ignore keys you do not recognise rather than failing on them.
Error message wording. Match on code, never on message.
Prices. Announced to affected customers before they take effect. Your invoice always uses the price that was in force at the time of the call — we keep price history for exactly this reason.
The data itself. Coverage grows and rows change as companies change. That is the product.

Date	Change
2026-08-17	v1 — first release. Company and decision-maker endpoints, free counts, cursor pagination, field-group pricing, 30-day repeat window, per-key quotas and spend cap.

OpenAPI description. Deliberately not shipped with v1: a hand-maintained specification that drifts from the implementation is worse than none, so it will come when it is generated from the same source as this documentation.
Webhooks for changes. Being able to hear that a decision-maker changed, rather than polling for it.

If either of those decides whether you can build what you want, say so — it moves them up the list.