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Wazen

Everything Wazen does, from one API key.

09:40

55 endpoints for messages, groups, channels, contacts, warming and webhooks, an MCP server with 52 tools for AI agents, and SDKs in four languages. Every plan gets all of it.

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7 days free with every feature except number warming. No card.

Wazen

Send text, photos, video, voice notes and documents.

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One endpoint sends any kind of message to any WhatsApp number. Messages are queued and delivered with pacing, and you can read the full history back.

  • Text, image, video, audio and document messages
  • Attach media by URL, or upload it as base64 up to 10 MB
  • Message history you can filter by type, plus single-message lookups
  • Download photos and files people send you
Wazen

Run groups and channels from your code.

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Create groups, manage who's in them and how they behave, and post to WhatsApp channels, all through the same API.

  • Create groups, add, remove, promote and demote members
  • Invite links: create, revoke, look up and join
  • Approve or reject join requests
  • Group settings: admin-only messages, lock, disappearing messages, join approval
  • Channels: create, post text and media, read posts, follow, mute and react
Wazen

Check a number is on WhatsApp before you message it.

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Look up one number or up to 500 at once. Cleaning a list before you send keeps failed messages, and the risk to your number, down.

  • Single number check with its WhatsApp ID
  • Bulk check of up to 500 numbers in one request
Wazen

Replies and delivery updates, pushed to your server.

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Subscribe a URL to the events you care about, for every number or just one. Failed deliveries are retried and every attempt is logged.

  • 10 event types, from new messages to read receipts and connection changes
  • HMAC-SHA256 signature on every delivery
  • Automatic retries when your server returns an error
  • Delivery logs, and a test delivery you can trigger for each webhook
Wazen

New numbers start slowly, on purpose.

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WhatsApp is wary of new numbers that suddenly send a lot. Warming builds up a number's activity over 14 days, and every message, warmed or not, is paced with natural gaps. Warming is included on every paid plan.

  • Start, pause, resume or cancel warming from the API or dashboard
  • Daily progress, with a webhook when each day and the whole ramp completes
  • Adaptive pacing on every send, free trial included

WarmingDay 14

messages a day100–200

Messages a day while warming: 5–10 on day one, rising to 100–200 by day 14.
Wazen

52 WhatsApp tools for your AI agent.

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The built-in MCP server lets Claude, Cursor and any other MCP client do what the API does: send messages, read history, run groups and channels, and check numbers. It uses your normal API key.

claude mcp add --transport http \
  --header "Authorization: Bearer wz_your_key" \
  wazen https://wazen.dev/mcp
MCP setup guide
Sessions (7)
create_sessionlist_sessionsget_sessiondelete_sessionrestart_sessionget_qr_codefactory_reset_session
Messages (3)
send_messageget_messagesget_message
Groups (14)
list_groupscreate_groupget_groupupdate_groupleave_groupmanage_participantssend_group_messageget_group_inviterevoke_group_invitejoin_groupget_group_invite_infoupdate_group_settingslist_group_requestshandle_group_requests
Channels (10)
create_channelget_channelupdate_channeldelete_channelsend_to_channelfetch_channel_messagesfollow_channelunfollow_channelmute_channelunmute_channel
Contacts (2)
check_contactbulk_check_contacts
Warming (5)
start_warmingget_warming_statuspause_warmingresume_warmingcancel_warming
Webhooks (5)
list_webhookscreate_webhookupdate_webhookdelete_webhooktest_webhook
Account (3)
get_accountget_usagecancel_subscription
API Keys (3)
create_api_keylist_api_keysrevoke_api_key
Wazen

Official SDKs, or plain HTTP.

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Install one line and send. For anything else there's an OpenAPI spec in JSON and YAML.

  • TypeScript / Node.js

    $ npm install @wazen/sdk

    @wazen/sdk

  • Python

    $ pip install wazen

    wazen

  • .NET / C#

    $ dotnet add package Wazen

    Wazen

  • PHP / Laravel

    $ composer require wazen/sdk

    wazen/sdk
Wazen

Careful with your keys and your customers' messages.

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Keys you control
API keys are shown once, stored only as SHA-256 hashes, and can be revoked at any time.
Encrypted at rest
Message content and each number's WhatsApp login are encrypted with AES-256-GCM.
Signed webhooks
Every delivery carries an HMAC-SHA256 signature of its body, so you can check it came from Wazen.
Paced sending
Every message is queued and sent with natural gaps, so one burst from your code doesn't put your number at risk.
Wazen

All 55 endpoints, on one screen.

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Nothing on this page is a roadmap item. Each line below is live today and documented with request, response and code examples.

API Keys

Sessions

Messages

Groups

Channels

Contacts

Warming

Webhooks

Account