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Heymarket API Documentation

For agents: Heymarket REST API docs for sending messages, managing contacts and conversations, with auth via JWT and an MCP server for Claude and Cursor.

sms apimessaging apicontacts managementmcp serverrest apiconversations

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-27T13:20:48.509Z. Cached copy · Source on heymarket.com

# Heymarket API Documentation

- [Heymarket API](https://developers.heymarket.com/index.md): Use the Heymarket REST API to send messages, manage contacts, organize conversations, and connect Heymarket with your own systems.
- [Get started with the Heymarket API](https://developers.heymarket.com/introduction.md): An overview of the Heymarket REST API: what it is, what you can build with it, the base URL, JSON encoding requirements, and mandatory HTTPS.
- [Authenticate with the Heymarket API](https://developers.heymarket.com/authentication.md): Create API Secrets, generate short-lived JWTs, and authenticate Heymarket API requests.
- [Connect AI tools with the Heymarket MCP server](https://developers.heymarket.com/mcp-server.md): Connect Claude, Cursor, and other AI clients to Heymarket over the Model Context Protocol (MCP) to manage contacts, send messages, triage conversations, and run supervised broadcast campaigns.
- [Rate limits and request IDs](https://developers.heymarket.com/rate-limits.md): Understand the Heymarket API's 500 req/min rate limit, how to use X-Request-Id when contacting support, and how to handle HTTP error codes.
- [Contacts](https://developers.heymarket.com/concepts/contacts.md): Understand how Heymarket contacts store customer identity, channels, custom fields, tags, ownership, and messaging status.
- [Conversations](https://developers.heymarket.com/concepts/conversations.md): Understand how Heymarket conversations group messages by contact, inbox, assignment, read state, and open or closed status.
- [Messages](https://developers.heymarket.com/concepts/messages.md): Understand Heymarket message types, send targets, media, templates, broadcasts, scheduled sends, and private comments.
- [Inboxes](https://developers.heymarket.com/concepts/inboxes.md): Understand how Heymarket inboxes map to team channels, phone numbers, member access, and sender IDs used by message requests.
- [Lists, templates, and scheduled sends](https://developers.heymarket.com/concepts/lists-templates-scheduling.md): Understand the reusable Heymarket objects that support broadcasts, personalized messages, scheduled delivery, tags, and surveys.
- [Webhooks](https://developers.heymarket.com/concepts/webhooks.md): Understand how Heymarket webhooks send real-time event notifications to your integration.
- [Send SMS and MMS messages](https://developers.heymarket.com/guides/send-message.md): Send individual messages, MMS attachments, templates, broadcasts, and private comments with POST /v1/message/send.
- [Create and manage contacts](https://developers.heymarket.com/guides/manage-contacts.md): Create, update, search, list, and delete Heymarket contacts, including custom fields, tags, and channel-based lookup.
- [Send broadcast messages](https://developers.heymarket.com/guides/broadcast-messages.md): Create contact lists and send broadcast messages where each recipient gets an individual thread in Heymarket.
- [Receive webhook events](https://developers.heymark
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Machine-readable: GET /v1/resolve?q=heymarket.com · GET /v1/domain/heymarket.com · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for heymarket.com:
1. POST https://agentwebmap.com/v1/sites/heymarket.com/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://heymarket.com/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/heymarket.com/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/heymarket.com).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

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