This page summarizes how the iClosed public API evolves. For every request and response field, treat the OpenAPI specification and the hosted API reference as the source of truth.
- Current version: v1 — all paths are prefixed with
/v1/. - Non-breaking changes — new optional fields, new endpoints, or additive enum values may ship without a version bump.
- Breaking changes — incompatible changes ship as
/v2/with a transition period (at least 60 days of overlap with v1, as described on the introduction page).
| Date | Summary |
|---|---|
| 2026-09-04 | Documented the hosted iClosed MCP server (https://mcp.iclosed.io/mcp) with OAuth, environment URLs, and a Claude Desktop connector walkthrough. |
| 2026-07-13 | Added POST /v1/fields/answer/bulk — bulk create or update a CONTACT custom field answer for up to 10,000 contacts in one request. |
For the latest machine-readable contract, diff or import openapi/v1/openapi.yaml from this repository.