sinth API

One API for adult AI communications — chat, voice, bots, training, and messaging. 79 endpoints, behind a single key.

Base URL

https://api.sinth.ai

Auth

api-key header for admin endpoints; api_key + creator params for the Conversation API.

Auth

Authentication and account creation

POST/signupCreate new user account POST/loginLogin to existing account POST/google_login_callbackGoogle OAuth login POST/send_password_reset_emailSend password reset email POST/reset_passwordReset password with token POST/generate_api_keyGenerate API key

Bots

Bot management — create, list, configure

GET/get_botsGet all bots for current user GET/list_botsList bot IDs GET/get_bots_with_namesList bots with names GET/get_bot_idsGet bot IDs by name GET/get_bot_nameGet bot name by ID POST/create_botCreate a new bot POST/create_bot_before_loginCreate bot before account login POST/set_bot_nameRename a bot POST/toggle_bot_responseToggle bot auto-response

Prompts

System prompt and behavior configuration

GET/get_promptGet bot system prompt GET/retrieve_promptGet bot prompt (by name or ID)GET/get_opening_messageGet bot greeting message GET/get_uiGet bot appearance settings GET/get_valuesGet bot behavior sliders POST/edit_promptUpdate bot system prompt POST/modify_promptUpdate bot prompt (by name or ID)POST/edit_opening_messageUpdate bot greeting message POST/edit_uiUpdate bot appearance settings POST/edit_valuesUpdate bot behavior sliders POST/set_calendar_linkSet calendar booking link POST/set_transfer_numberSet call transfer number POST/retrain_responseRetrain a specific response

Training

Knowledge base — upload files, scrape URLs, manage training data

GET/get_filenamesList uploaded training files GET/get_pagenamesList scraped pages GET/get_feedsList CSV/data feeds POST/uploadUpload training file (direct)POST/upload_bubbleUpload training file (via URL)POST/scrape_websiteScrape website for training POST/add_feedAdd CSV/data feed URL POST/delete_fileDelete a training file POST/delete_pageDelete a scraped page POST/feedback_apiSubmit conversation feedback

Conversations

Chat, messaging, and conversation history

POST/conversation_apiSend a message and get AI response POST/conversation_inferenceRun inference with full configuration GET/get_conversation_externalGet conversation list POST/get_conversationsGet conversation list with details POST/add_message_to_conversationAdd message to conversation POST/import_conversation_historyImport conversation history POST/send_bulk_messagesSend bulk messages

Users

Bot user and subscriber management

GET/get_usersList bot users GET/get_subscribersList SMS subscribers POST/add_userAdd user to bot POST/add_subscriberAdd SMS subscriber POST/delete_subscriberRemove SMS subscriber

Phone & SMS

Phone number management and SMS messaging

POST/add_custom_phoneAttach phone number to bot POST/retrieve_custom_phoneGet bot's attached phone number POST/direct_sms_apiSend SMS message GET/get_daily_sms_limitGet daily SMS limit POST/set_daily_sms_limitSet daily SMS limit

Twilio

Twilio number search, purchase, and assignment

GET/search_for_twilio_numberSearch available phone numbers GET/get_number_from_poolList available pool numbers POST/purchase_twilio_numberPurchase a phone number POST/import_twilio_numberImport existing Twilio number POST/rent_twilio_numberRent a pool number POST/assign_phone_numberAssign phone number to bot POST/detach_twilio_numberDetach phone number from bot

Voice

Voice calling and voice provider configuration

GET/get_voicesList available voices POST/set_voiceSet bot voice POST/set_voice_providerSet voice provider POST/import_number_to_blandImport number to Bland AI POST/import_number_to_openaiImport number to OpenAI Realtime POST/outbound_callInitiate outbound call

Analytics

Usage metrics and activity logs

GET/get_message_countGet bot message count GET/get_daily_conv_countGet daily conversation count GET/get_total_message_countGet total message count across all bots GET/get_usageGet account usage GET/get_logsGet bot activity logs

Notifications

Email and notification settings

GET/get_notification_typesGet notification settings POST/edit_notification_typesUpdate notification settings POST/edit_email_notification_settingsConfigure email notifications

Webhooks

Webhook configuration for real-time events

POST/set_webhookSet webhook URL

Payments

Plans, pricing, and subscription management

POST/create_custom_planCreate custom pricing plan POST/cancel_recurring_paymentCancel subscription