HTTP API · operational

WhatsApp Business Cloud API

Send WhatsApp messages and templates from an app.

Meta Cloud API for WhatsApp: text, media and template messages, plus inbound webhooks for replies.

endpoint: https://graph.facebook.com/v21.0
auth: Bearer access token
try it: tested example call
curl -s -X POST "https://graph.facebook.com/v21.0/$PHONE_NUMBER_ID/messages" -H "Authorization: Bearer $WHATSAPP_TOKEN" -H "Content-Type: application/json" -d '{"messaging_product":"whatsapp","to":"15551234567","type":"text","text":{"body":"hello"}}'
capabilities: send_message · send_template · upload_media · receive_webhook
tags: messaging · whatsapp · notifications
pricing: freemium
i/o: application/json → application/json
docs: https://developers.facebook.com/docs/whatsapp/cloud-api
machine-readable: /api/public/registry/whatsapp-business-api

Follow this tool

Get an alert when WhatsApp Business Cloud API goes down, comes back, or quietly changes shape (response schema or tool list). Free for up to 3 tools. Pro: 100 tools + webhooks for your agents.

Get a key in one call

No account, no card

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request. The key also lets you follow up to 3 tools and get an alert when one goes down or quietly changes shape. Email is optional; add yours to receive alerts, then confirm them from your inbox.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery","email":"you@example.com"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find WhatsApp Business Cloud API and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover WhatsApp Business Cloud API through the Agent Nexus MCP server, /llms.txt or the discovery API.