Contacts API

Name: Contacts API API
Brand: Contacts API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentCRMContact Managementbearer32 EndpointsREST

For Agents

Manage HighLevel CRM contacts and their related tasks, notes, tags, appointments, campaigns, and workflows through 32 endpoints under the LeadConnector base URL.

Quickstart

Get started with Contacts API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"tag a HighLevel contact and trigger a workflow"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Contacts API API.

Search contacts and detect duplicates by email, phone, or custom field

Create, update, and complete tasks attached to a specific contact record

Add or remove tags in bulk to drive workflow and campaign segmentation

Enroll contacts into HighLevel campaigns and trigger automation workflows

GET STARTED

Start building with Contacts API API

Explore with Jentic

View OpenAPI Document

Use for: Find a HighLevel contact and check whether it is a duplicate of an existing record, I want to create a follow-up task on a contact and mark it complete later, Add a list of tags to a contact to enroll it in the right nurture sequence, List all appointments booked against a HighLevel contact

Not supported: Does not handle calendar configuration, conversation messaging, payments, or sub-account provisioning — use for HighLevel contact, task, tag, note, appointment-read, campaign, and workflow operations only.

Jentic publishes the only available OpenAPI document for Contacts API, keeping it validated and agent-ready.

The HighLevel Contacts API exposes 32 endpoints for managing contacts, tasks, notes, tags, appointments, campaigns, workflows, and follower lists inside the HighLevel marketing CRM. It supports duplicate detection, bulk tag operations, and lookups across nested resources such as a contact's tasks and appointments. Designed for agencies that build automations on top of HighLevel sub-accounts, the API uses bearer tokens with location and agency scope variants so requests respect the account hierarchy.

Use Cases

Patterns agents use Contacts API API for, with concrete tasks.

★ Agency Lead Routing Automation

Marketing agencies running HighLevel sub-accounts can route inbound leads to the right pipeline by creating contacts, tagging them, and enrolling them into campaigns through the API. The Contacts API handles duplicate detection so a returning lead is updated rather than duplicated, and tag-driven workflows fire the correct nurture sequence within minutes of capture.

Search for a contact by email, add the tag 'qualified-lead', and enroll the contact into campaign id cmp_123.

Task Management on Customer Records

Customer success teams use the Contacts API to attach tasks to a contact record so follow-ups stay in context. Agents create tasks with due dates, mark them complete when the work is done, and read open tasks across a contact to build dashboards or daily call lists without leaving HighLevel.

Create a task titled 'Renewal call' on contact contact_42 with due date 2026-07-01 and mark it complete after the call.

Bulk Tag Operations During Migrations

When migrating contacts from another CRM into HighLevel, the bulk tag endpoints let teams classify thousands of records by source, lifecycle stage, or product interest in a single pass. Combined with workflow triggers, this turns a flat import into an active segmentation in one deployment.

Tag 5,000 imported contacts with 'migrated-2026-q2' and 'source-typeform' using the bulk tag endpoint.

AI Agent CRM Updates via Jentic

An AI agent handling a sales conversation can update HighLevel contact records, log notes summarising the call, and trigger a workflow without the developer wiring REST clients. Through Jentic the agent searches for the right Contacts API operation by intent, loads its schema, and executes against the LeadConnector base URL using a scoped credential.

After a sales call, append a note summarising the conversation to contact contact_88 and trigger workflow wf_renewal.

Key Endpoints

32 endpoints — the highlevel contacts api exposes 32 endpoints for managing contacts, tasks, notes, tags, appointments, campaigns, workflows, and follower lists inside the highlevel marketing crm.

METHOD

PATH

DESCRIPTION

POST

/contacts/search

Search contacts by filters

GET

/contacts/search/duplicate

Detect a duplicate contact

POST

/contacts/{contactId}/tasks

Create a task on a contact

POST

/contacts/{contactId}/tags

Add tags to a contact

DELETE

/contacts/{contactId}/tags

Remove tags from a contact

GET

/contacts/{contactId}/appointments

List appointments for a contact

GET

/contacts/{contactId}/notes

List notes on a contact

POST

/contacts/search

Search contacts by filters

GET

/contacts/search/duplicate

Detect a duplicate contact

POST

/contacts/{contactId}/tasks

Create a task on a contact

POST

/contacts/{contactId}/tags

Add tags to a contact

DELETE

/contacts/{contactId}/tags

Remove tags from a contact

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

HighLevel bearer tokens are stored encrypted in the Jentic vault (MAXsystem) and scoped to the location or agency the token was issued for. Agents receive a short-lived execution handle, so the raw token never enters the model context.

Intent-based discovery

Agents search Jentic by intent (e.g. 'tag a HighLevel contact') and Jentic returns the matching Contacts API operation with its input schema, so the agent can call /contacts/{contactId}/tags without browsing the LeadConnector docs.

Time to first call

Direct HighLevel integration: 1-2 days for OAuth setup, location scoping, and error handling. Through Jentic: under 30 minutes — search, load, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

HubSpot CRM Contacts

HubSpot's first-party contacts API offers a larger ecosystem and richer enrichment than HighLevel.

Choose HubSpot when the agent needs deep marketing-hub integration, advanced reporting, or association graphs across deals and tickets.

Alternative

Salesforce REST API

Enterprise-grade CRM with stronger admin controls than HighLevel's agency model.

Use Salesforce when the org already runs Sales Cloud and the agent needs to write to standard Lead and Contact objects.

Complementary

Plivo

Send SMS to HighLevel contacts after the agent updates the record.

Pair with HighLevel when outbound messaging needs higher deliverability than HighLevel's bundled SMS.

FAQs

Specific to using Contacts API API through Jentic.

What authentication does the HighLevel Contacts API use?

The Contacts API uses bearer token authentication on the Authorization header, with five scoped scheme variants (bearer, Location-Access, Location-Access-Only, Agency-Access, Agency-Access-Only) so a token only acts on the sub-account or agency level it was issued for. Through Jentic the bearer token is held in the encrypted vault and never enters the agent context.

Can I add tags in bulk with the HighLevel Contacts API?

Yes. POST /contacts/{contactId}/tags accepts an array of tag names and DELETE /contacts/{contactId}/tags removes them, and a Bulk tag endpoint group lets you act on many contacts in one call instead of looping per record.

What are the rate limits for the HighLevel Contacts API?

HighLevel applies per-location and per-burst limits documented at highlevel.stoplight.io. The OpenAPI spec does not encode the exact numbers, so check the LeadConnector developer portal for the current daily and burst caps before running large migrations.

How do I trigger a HighLevel workflow for a contact through Jentic?

Search Jentic for 'add a contact to a HighLevel workflow', load the schema for the POST workflow trigger endpoint under /contacts/{contactId}/workflow, and execute with the contactId and workflowId. Jentic injects the bearer token at execution so the agent only handles business arguments.

Can I detect duplicates before creating a contact?

Yes. GET /contacts/search/duplicate accepts identifiers like email and phone and returns the matching contact if one already exists, which is the recommended pattern before creating a new record from a form submission or import.

Does the Contacts API cover appointment booking itself?

No. GET /contacts/{contactId}/appointments only reads appointments associated with a contact. The appointment creation and calendar configuration endpoints live in the broader HighLevel Calendars API, not in the Contacts spec.