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Integrations · Reference

API Endpoint Reference

Every supported request, grouped by what it touches — contacts, activity, configuration, users and money.

New · Updated Sep 21, 2026 · 5 min read
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1How to read this list

Every request below is called as https://api.clienttether.com/v2/api/<request> with the two access headers described in API Overview. read_ requests are GET; create_ and update_ are POST; delete_ are DELETE. The keys each one accepts are in API Parameters Reference.

Not everything supports the full set of operations. Where a feature has no update_ or no delete_, that operation simply isn’t offered.

2Contacts

RequestWhat it does
create_clientCreate a contact. firstName and lastName required.
read_client_existCheck whether a contact already exists, typically by phone.
read_client_by_id / read_client_by_external_idFetch one contact by ClientTether id or by your own id.
read_client_list / read_contactsList contacts.
update_client_by_id / update_client_by_external_idChange a contact.
delete_client_by_id / delete_client_by_external_idRemove a contact.
read_custom_field_by_contactRead a contact’s custom-field values.
read_opportunity_listList opportunities.

3History, events and messages

RequestWhat it does
create_history_notes / create_client_history_noteWrite a note into a contact’s history.
read_client_history_notesRead a contact’s history.
create_client_eventCreate a Call, Contact Reminder or Appointment.
read_all_client_events / read_all_events / read_appts_by_user_idRead events, for a contact, for the account, or for a user.
update_client_event / delete_client_eventChange or remove an event.
read_available_timeslotsFind bookable slots — the basis of any custom scheduling front end.
create_manual_email / create_manual_textSend an email or a text to a contact.
create_immed_callPlace a call immediately.
read_pending_actionsWhat’s queued for a contact.

4Plans, cycles, sources, tags

RequestWhat it does
create_action_plan, read_action_plan_list, read_action_plan_by_id, update_action_plan_by_idManage action plans. A Connection Plan can link to a lead source; a Conversion Plan to a sales cycle.
create_sales_cycle, read_sales_cycle_list, update_sales_cycle_by_id, delete_sales_cycle_by_idManage sales-cycle steps.
read_sales_cycle_any_activityActivity across the cycle.
create_lead_source, read_lead_source_list, update_lead_source_by_id, delete_lead_source_by_idManage lead sources.
create_tag, read_tags_listManage tags.
read_hosted_pagesList the account’s hosted pages.

5Users, accounts and money

RequestWhat it does
create_user, read_user_list, read_user_by_id, update_user_by_id, delete_user_by_idManage logins.
read_account_list, update_account_by_id, delete_account_by_idManage accounts in the tree — including retrieving sub-account web keys.
read_proposals, read_proposal_payments, read_all_paymentsRead proposals and the money against them.

Deletes are real

delete_client_by_id, delete_user_by_id and delete_account_by_id act immediately and are not a confirmation dialog away. Test against a sandbox account, and log what you delete.