For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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Close

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Getting Started

API Changelog

As we make changes to our API, we’ll publish below. Changes to the product itself will be published on Product Updates.

April 6, 2026
April 6, 2026
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Blocked Phone Numbers API

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applies_to field on Outcomes deprecated for write operations

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OpenAPI Spec now available

We now publish an OpenAPI spec for the Close API at: https://api.close.com/api/openapi.json

This spec is currently considered experimental and does not yet contain 100% coverage of request/response schemas. If you have any feedback or use cases you’d like to share, please let us know by emailing support@close.com.