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APIs/Communications

Communications APIs

Explore APIs in this category. Connect any of them to your AI agent through Jentic.

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Most Popular

Slack Web API

Send messages, manage channels, upload files, and administer workspaces through 169 HTTP RPC-style endpoints. Supports real-time messaging, threaded conversations, emoji reactions, file sharing, user group management, app installation administration, and granular OAuth 2.0 scope-based permissions across Slack workspaces.

Google Gmail API

Send, receive, and organize email programmatically through Gmail mailboxes with support for threads, labels, drafts, and push notifications. Access 1.8 billion Gmail accounts' messaging infrastructure including attachment handling, search filtering, and real-time change notifications via pub/sub watches. Supports batch operations for bulk message management and granular OAuth scopes for least-privilege access control.

Twilio REST API

Send and receive SMS and MMS messages, initiate and control voice calls, manage phone numbers, and handle conference calls across 180+ countries. Provides programmable communication building blocks including call recordings, transcriptions, SIP trunking, and queue management. Supports both domestic and international messaging with media attachments and delivery status callbacks.

Sendgrid Twilio SendGrid Mail API

Send transactional and marketing emails at scale over HTTP with support for templates, categories, open and click tracking, and batch scheduling. Group mail sends into batches that can be scheduled, paused, or cancelled by batch ID. Supports global and EU-regional endpoints for data residency compliance.

Discord API

The Discord HTTP API powers bots, integrations, and applications across Discord servers (guilds), channels, voice connections, and user accounts. The v10 surface covers 217 endpoints spanning guilds, channels, messages, threads, members, roles, voice regions, OAuth2, application commands, webhooks, stage instances, and partner SDK provisional accounts. It is the primary backbone for community automation, moderation tooling, and game integrations.

Zoom Meetings

The Zoom Meeting API lets developers create, manage, and automate Zoom Meetings and Webinars programmatically. It covers the full meeting lifecycle - scheduling meetings and webinars, managing registrants and panelists, handling cloud recordings and archive files, controlling live in-meeting status, and pulling polls, surveys, and recording analytics. Built on Zoom's v2 platform, it supports both OAuth 2.0 and API-key authorization for marketplace apps. The API exposes 186 operations across 129 paths.

Core Telegram Telegram Bot API

Jentic publishes the only available OpenAPI specification for Telegram Bot API, keeping it validated and agent-ready. The Telegram Bot API exposes 24 method-style endpoints under the path /{methodName} for sending messages, photos, documents and other media to chats, plus webhook setup, getMe identity checks, message forwarding and copying, and update polling for long-poll bot architectures. Authentication is via the bot token embedded in the path (https://api.telegram.org/bot{token}/METHOD), and methods accept JSON or form-encoded bodies. The API supports both polling (getUpdates) and push (setWebhook) flows for receiving incoming messages.

Sinch Conversation API

The Sinch Conversation API enables sending and receiving messages globally across SMS, RCS, WhatsApp, Viber Business, Facebook Messenger, and other channels through a unified interface. The API exposes 22 endpoints secured with basic, oauth2 authentication.

Plivo SMS API

Jentic publishes the only available OpenAPI specification for Plivo SMS API, keeping it validated and agent-ready. Send and receive SMS, MMS, and WhatsApp messages to 200+ countries through a straightforward REST API with 4 endpoints. Retrieve message delivery status, list sent messages with filtering, and access media attachments on MMS messages. Supports both single-recipient and bulk messaging with per-message delivery receipts.

Nylas API

The Nylas API v3 provides a unified communications surface across email, calendar, and contacts that abstracts away the differences between Google, Microsoft, and IMAP backends. The 55-endpoint API covers OAuth-style hosted authentication, grant management, connector configuration, and full read/write operations on messages, threads, drafts, events, calendars, and contacts. It is well suited to building scheduling tools, inbox-aware AI assistants, and CRM enrichment workflows that need to read and write across whichever email and calendar provider the end user happens to use.

MessageBird SMS API

Jentic publishes the only available OpenAPI specification for MessageBird SMS API, keeping it validated and agent-ready. The MessageBird SMS API sends and manages SMS messages through MessageBird's global mobile network, returning delivery metadata for each send. Agents can dispatch a message, list previously sent messages, look up a single message by ID, and delete a stored message record from the same compact surface. Authentication uses MessageBird's `AccessKey` scheme and the API is suitable for transactional SMS, OTP delivery, and outbound notifications.

Postmarkapp Postmark API

The Postmark API handles transactional email delivery with 43 endpoints covering sending (single, batch, and templated), bounce management, inbound message processing, outbound message search, delivery statistics, and template management. It tracks opens, clicks, and spam complaints with per-message granularity and supports inbound email processing with bypass and retry controls. Authentication uses a per-server token in the X-Postmark-Server-Token header.

Singaporechatbots Sg Facility Chatbot API documentation.

FacilityBot API for facility management, fault reporting, and building maintenance. The API exposes 1320 endpoints.

Telnyx API

Deliver SMS, MMS, voice calls, fax, SIP trunking, and AI-powered call control through a unified API with 713 endpoints. Purchase and manage phone numbers across 60+ countries, configure messaging profiles and campaigns for 10DLC compliance, and run AI assistants on live calls. Includes embedded AI features for chat completions, embeddings, transcription, and fine-tuning alongside core telephony services.

Aswat Ziwo API

Ziwo is a cloud contact-centre platform from Aswat that connects real or virtual agents to phone numbers across more than 150 countries, with prebuilt CRM plugins for Salesforce, HubSpot, Zendesk, and others. The API exposes the full operational surface of a contact centre - authentication and session management, agent and queue administration, call recording and transcription, number provisioning, WhatsApp and SMS channels, IVR configuration, and reporting. It is sized for production telephony deployments rather than light integrations, with hundreds of endpoints covering both admin and supervisor workflows.

MailSlurp API

The MailSlurp API creates email inboxes and phone numbers on demand and sends and receives email and SMS. It creates inboxes, sends emails, waits for and reads incoming messages and their attachments, and manages templates, contacts, webhooks, forwarders, and rulesets. Phone numbers can be allocated to receive SMS. Responses are JSON, so an agent can spin up a test inbox, send a message, and read the reply without running its own mail server.

Smith Langchain LangSmith

The LangSmith API is used to programmatically create and manage LangSmith resources. Host https://api.smith.langchain.com Authentication To authenticate with the LangSmith API, set the `X-Api-Key` header to a valid [LangSmith API key](https://docs.langchain.com/langsmith/create-account-api-key#create-an-api-key). The API exposes 440 endpoints secured with apiKey, bearer authentication.

Sellsy API

Find out the [Postman collections](dist/postman/CollectionsApiV2.json) with the required [environment variables](dist/postman/Environment.json) Find out the [Changelog](changelog.html) Errors The errors are returned in JSON with the following format: The `details` field can contain an object that details the error. It is used in particular during validation to return the invalid fields | HTTP Code. The API exposes 351 endpoints secured with oauth2 authentication.

Nedzo API

Jentic publishes the only available OpenAPI specification for Nedzo API, keeping it validated and agent-ready. The Nedzo API is the programmatic surface of the Nedzo AI voice and communications platform, exposing 345 endpoints across workspaces, AI voice agents, contacts, contact lists, calls, templates, embeddable widgets, branding, and a GoHighLevel workflow integration. It supports a bearer API key for tenant access, an internal X-Service-Key for service-to-service calls, and a Supabase JWT scheme for dashboard users. The base URL is https://api.nedzo.ai and the API is structured around a /v1 namespace with public widget endpoints under /public.

Moveo.AI

The Moveo.AI API builds, trains, and runs conversational AI agents, which Moveo calls brains, and connects them to channels such as Facebook, Viber, and a web widget. Brains are configured with intents, entities, dialogs, insights, webhooks, and a model strategy, then versioned, published, and retrained. Environments, called desks, hold sessions, conversations, routing rules, departments, SLAs, business hours, macros, and channel integrations for the live support team. Knowledge bases ingest documents from datasources and can be searched, while contacts, campaigns, and reports cover customer records, outbound messaging, and analytics.

Emailconsul API

The Emailconsul API watches email deliverability and sender reputation: it aggregates DMARC reports by domain, pulls Google Postmaster and SNDS data, and checks IPs, domains, DKIM, and DMARC records against validators and blocklists. It verifies and cleans email lists, runs seed-list inbox placement tests, tracks spam-trap and lookalike-domain hits, and sets up tracking pixels and links with alerts. It is the monitoring layer that tells you whether your email reaches the inbox.

Wallester

Wallester Card API Rate limits Wallester has no rate limits and allows sending an unlimited number of requests to API, but we reserve the right to impose such limits if necessary. RSA keys Encrypted card data exchange schema: ![Encrypted card data exchange schema](img/encrypted-card-data-exchange-schema.png) Public key needed in the request might be programmed to be generated and encrypted on each. The API exposes 248 endpoints.

ClickSend REST API v3

Jentic publishes the only available OpenAPI specification for ClickSend REST API v3, keeping it validated and agent-ready. ClickSend is a multi-channel business messaging platform covering SMS, MMS, voice, fax, email, and postal mail (letters and postcards). The 205-endpoint v3 surface exposes contact list management, send and history endpoints for each channel, automation rules for inbound and receipt handling, account recharge and pricing, geolocation lookups, and detailed delivery reporting. Authentication uses HTTP Basic with the username and an API key obtained from the ClickSend dashboard.

Primitive API

The Primitive API gives AI agents their own email: it receives mail at your verified domains, sends outbound messages and threaded replies, and pushes each inbound email to webhook endpoints or serverless functions. Inbound mail can be listed, searched with structured filters such as from, subject, has_attachment, and spam_score_lt, or ranked with keyword, semantic, or hybrid semantic search across received and sent mail. Around that core it manages domain claims and DNS verification, recipient routes, filter rules, wake schedules, scheduled and repeating sends, contacts and contact policy, agent connections and registries, and x402 payment challenges.

Amazon Chime

The Amazon Chime API runs communications and meeting infrastructure: online meetings, attendees, chat channels, and voice connectors for SIP telephony. It covers account and user administration, real-time messaging channels, and phone-number management across a broad operation set. Requests authenticate with AWS Signature Version 4 (SigV4).

Trakt Tv Trakt API

At Trakt, we collect lots of interesting information about what tv shows and movies everyone is watching. Part of the fun with such data is making it available for anyone to mash up and use on their own site or app. The Trakt API was made just for this purpose. It is very easy to use, you basically call a URL and get some JSON back. More complex API calls (such as adding a movie or show to your co. The API exposes 183 endpoints secured with oauth2 authentication.

Trakt Tv Trakt API

At Trakt, we collect lots of interesting information about what tv shows and movies everyone is watching. Part of the fun with such data is making it available for anyone to mash up and use on their own site or app. The Trakt API was made just for this purpose. It is very easy to use, you basically call a URL and get some JSON back. More complex API calls (such as adding a movie or show to your co. The API exposes 183 endpoints secured with oauth2 authentication.

CommsHarbor

The CommsHarbor API sends transactional email on behalf of an organization and records what happens to every delivery. It registers and verifies sending domains against SES, DKIM, and DMARC, queues idempotent messages, exposes normalized delivery feedback events, and manages suppressions so bad addresses are not retried. A built-in tenant CRM stores contacts, companies, deals, pipelines, tasks, and marketing consent alongside the sending data. Authentication uses a bearer API key, with a session cookie for account-level operations.

runZero API

runZero API. API use is rate limited, you can make as many calls per day as you have licensed assets. The API exposes 181 endpoints secured with bearer, oauth2 authentication.

Drop Cowboy API

The Drop Cowboy API sends outbound messages across channels: ringless voicemail, SMS and RCS texts, email, voice broadcasts, and AI calls. It manages the contacts, tags, lists, and campaigns behind those sends, rents and configures phone numbers and IVR lines, and builds AI agents that place and handle calls. Sends are asynchronous and return a 202, with results delivered to a callback URL and status webhooks, and the API records consent and maintains a do-not-contact list for compliant outreach.

Amazonaws Amazon Connect

Jentic publishes the only available OpenAPI specification for Amazon Connect, keeping it validated and agent-ready. Amazon Connect is a cloud contact center service that handles voice, chat, tasks, and email interactions, contact routing, agent management, and real-time and historical analytics. The API surface covers instance configuration, contact flows, routing profiles, queues, hours of operations, agent statuses, contact controls (transfer, hold, monitor), Lex and Lambda integrations, predictive and outbound dialing, and storage for recordings and transcripts. It is the programmatic surface behind a complete enterprise contact center.

Getstream Stream API

The Stream API powers in-app chat, channels, messages, reactions, threads, moderation, and activity feeds for consumer and SaaS products. It exposes 171 endpoints covering channel CRUD, message send and update, member roles, push notifications, blocklists, campaigns, and AI-assisted moderation. Stream issues short-lived JWT tokens per user so each client only sees the channels they belong to, and supports a global edge network for low-latency delivery worldwide.

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