AI Agents Accessible APIsSMS and messaging apps

SMS and messaging apps APIs and MCP servers for AI agents

Send and receive SMS and messages on WhatsApp, LINE or Telegram through a messaging provider's API.

10 sms and messaging apps APIs an AI agent can call: auth method and header, official MCP server (8), free tier (3), docs links. Machine-readable JSON included. Agents: fetch catalog/sms-messaging.json instead of parsing this page. Last checked 2026-09-24.

Ratings and usage (★) fetched: .

ServiceWhat an agent can doAuthMCP serverFree tierDetails (with sources)NotesProof (ratings, usage)
AWS End User Messaging SMSSend SMS, MMS and voice messages and manage sender numbers, opt-outs and registrations via the AWS SMS and Voice v2 API.cloud IAM
AWS Signature Version 4 with IAM credentials (use an AWS SDK or CLI: aws pinpoint-sms-voice-v2 send-text-message)		officialPaid only; US SMS $0.00774/message + $0.00421 carrier fee (10DLC or toll-free)Base URL: https://sms-voice.{region}.amazonaws.com
Free plan: none ↗
Rate limits: SendTextMessage 1 request/s per region by default (raisable); 1 msg/s per recipient; sandbox $1/month spend ↗
MCP tools: 8: aws___run_script, aws___search_documentation, aws___read_documentation, aws___retrieve_skill, aws___list_regions, aws___get_regional_availability … ↗		New accounts start in a sandbox: $1/month spend limit, up to 10 verified destination numbers. Production access needs an AWS Support case (reviewed, about 24 h). US sending needs a registered 10DLC or toll-free number. SendTextMessage defaults to 1 request/s per region. The AWS MCP Server is generic (calls any AWS API).—
Bird (formerly MessageBird)Send SMS, email and WhatsApp messages, verify phone numbers and track delivery via REST API or hosted MCP.API key / OAuth
Authorization: Bearer bk_<region>_... workspace API key (dashboard), or OAuth 2.0 user token (auth code + PKCE or device flow)		officialPaid only; prepaid wallet, US long code or toll-free $0.0035/SMS + carrier feesBase URL: https://us1.platform.bird.com/v1 (or https://eu1.platform.bird.com/v1)
Free plan: none ↗
Rate limits: Per-organization regional policies (e.g. sms_send); quota in RateLimit-Policy header; 429 with Retry-After ↗
Async jobs: POST /v1/sms/messages returns 202 Accepted with a message id; final status via webhooks or GET ↗
OAuth scopes: sms:write, sms_management:write, numbers:write ↗
MCP tools: 14: sms_send, sms_send_batch, sms_get, sms_list, sms_list_events, sms_senders_create … ↗		SMS draws on a prepaid wallet (402 if empty). Destination countries are default-deny except your home country; enable more in the dashboard. US long codes need 10DLC registration; the US has no alphanumeric senders. Hosted MCP uses OAuth; a local stdio MCP runs via the bird CLI (bird mcp).—
LINE Messaging APILets an agent send and reply to messages, rich messages and broadcasts to users of a LINE Official Account and read user profiles.API key
Authorization: Bearer <CHANNEL_ACCESS_TOKEN> (issued for the Messaging API channel in LINE Developers Console)		officialFree Communication plan (Japan): 200 push/broadcast messages/month; reply messages are unlimited. Beyond that only paid plans (Light JPY 5,000 for 5,000 messages, Standard JPY 15,000 for 30,000). Free quotas vary by regionBase URL: https://api.line.me
Free plan: 200 messages (Communication plan, Japan), per month, no card ↗
Example call: send a push message: POST https://api.line.me/v2/bot/message/push ↗
Unit price: Japan Standard plan (JPY 15,000/mo incl. 30,000 messages): additional push messages up to JPY 3 each, counted per recipient; reply messages are free ↗
MCP tools: 13: push_text_message, push_flex_message, broadcast_text_message, broadcast_flex_message, get_profile, get_message_quota … ↗		Requires a LINE Official Account and a Messaging API channel. MCP server is local (stdio, npx @line/line-bot-mcp-server) with channel token and user ID env vars.—
PlivoSend and receive SMS and MMS worldwide and check delivery status via REST API.API key
HTTP Basic auth: Auth ID as username, Auth Token as password (from Plivo console)		officialTrial: $10 free credits, no card; then paid per message (US long code $0.0077/SMS + carrier surcharge)Base URL: https://api.plivo.com/v1/Account/{auth_id}
Free plan: $10 in free credits, one-time, no card ↗
Rate limits: 300 requests per 5 seconds; 429 when exceeded ↗
Example call: send an SMS: POST https://api.plivo.com/v1/Account/{auth_id}/Message/ ↗
Unit price: US outbound SMS: long code $0.0077, toll-free $0.0079 per message, plus carrier surcharge $0.0035-$0.0050 ↗
MCP tools: 6: send_sms, make_call, create_application, create_endpoint, get_cdr, get_mdr ↗		Signup needs a business email and phone verification. Trial accounts can only message verified sandbox numbers, no alphanumeric sender IDs. US A2P traffic needs 10DLC or toll-free registration. The MCP at plivo.com/docs/mcp only searches docs.—
SinchSend and receive SMS (and WhatsApp, RCS and other channels) via the Conversation REST API.API key
Access key ID + secret (dashboard > Access keys): HTTP Basic, or exchange at https://auth.sinch.com/oauth2/token (client credentials) for a Bearer token		officialTrial: free trial credit and a free test number on signup, no card; then paid (US 10DLC $0.0078/SMS + carrier fees)Base URL: https://{region}.conversation.api.sinch.com (region: us, eu, br)
Free plan: Trial credit and one free test number on signup, one-time, no card ↗
Rate limits: 800 requests/s per project; app queue drains to channel at 20 msg/s by default; 429 when exceeded ↗
Example call: send an SMS via the Conversation API: POST https://{region}.conversation.api.sinch.com/v1/projects/{project_id}/messages:send ↗
Unit price: US SMS (10DLC or toll-free): $0.0078 per outbound message, plus carrier fees ↗
MCP tools: 11: send-text-message, send-media-message, send-template-message, send-choice-message, send-location-message, list-conversation-apps … ↗		The standalone SMS API is only for existing customers; new accounts send SMS through the Conversation API with an SMS channel. The trial test number can only text your own verified numbers. US A2P needs 10DLC or toll-free registration. MCP server (npm @sinch/mcp) is a developer preview, run locally or self-hosted.—
Telegram Bot APISend/receive messages, media, and inline interactions via a simple HTTPS bot API.API key
token in URL path: https://api.telegram.org/bot<token>/METHOD		communityfree, no key needed beyond a bot token from @BotFatherBase URL: https://api.telegram.org/bot<TOKEN>
Free plan: free_tier, no card ↗
Rate limits: ~1 message/s per chat, 20 messages/min per group, ~30 messages/s for bulk; paid broadcasts up to 1,000/s ↗
Example call: send a text message: POST https://api.telegram.org/bot{token}/sendMessage ↗
MCP tools: 6: send_message, reply_to_message, edit_message, list_chats, send_file, download_media ↗		No single official SDK (community libraries only); a self-hosted local Bot API server option removes some file-size limits. Listed MCP server uses a user account via Telethon/MTProto (API_ID/API_HASH + session string from my.telegram.org), not the bot token.GitHub 1,692★ chigwell/telegram-mcp
TelnyxSend and receive SMS, MMS, RCS and WhatsApp messages and manage phone numbers via REST API.API key
Authorization: Bearer <TELNYX_API_KEY> (Mission Control Portal > API Keys)		officialTrial: free testing credits on signup (amount not published); then paid (US 10DLC $0.004/SMS part + carrier fees)Base URL: https://api.telnyx.com/v2
Free plan: Free testing credits for new accounts (amount not stated), one-time ↗
Rate limits: Send rate per sender: long code 0.1 msg/s (non-US), toll-free 20 msg/s, short code 1,000 msg/s; excess is queued ↗
Async jobs: Send is queued; delivery progress and final status arrive via messaging webhooks ↗
Example call: send an SMS: POST https://api.telnyx.com/v2/messages ↗
MCP tools: 3: list_api_endpoints, get_api_endpoint_schema, invoke_api_endpoint ↗		US A2P messaging needs 10DLC registration; US long-code throughput is set per 10DLC campaign. Default send rates: long code 0.1 msg/s (non-US), toll-free 20 msg/s per number. Agents can sign up via a bot-challenge flow (telnyx.com/agent-signup.md).—
TwilioSend/receive SMS, WhatsApp messages, and voice calls programmatically via REST API.API key
Basic auth: AccountSID:AuthToken (or API Key SID:Secret)		officialTrial: 100 SMS, 100 WhatsApp, 3,000 emails, 75 voice minutes; no card; one-time on signup, expires after 30 daysFree plan: 100 SMS, 100 WhatsApp messages, 3,000 emails, 75 voice minutes; expires after 30 days; only up to 5 verified numbers, one-time, no card ↗
Example call: send an SMS: POST https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Messages.json ↗
Unit price: SMS to Poland: $0.0457 per outbound segment (mobile numbers and alphanumeric sender IDs); $0.001 fee per failed message ↗
MCP: docs-only: the server searches documentation, it cannot call the API ↗		Trial accounts can only message verified numbers; US SMS at scale requires A2P 10DLC registration. Hosted MCP is read-only docs/API-spec search; the executing server is Twilio Labs' npm @twilio-alpha/mcp (alpha).GitHub 111★ twilio-labs/mcp
SourceForge 4.8★/13 reviews
Vonage APISend SMS, make voice calls, and build video apps via a unified communications REST API.API key
API key+secret for SMS/Number Insight; JWT bearer token for Voice/Video APIs		officialtrial/test credit on signup, then pay-as-you-goExample call: send an SMS: POST https://rest.nexmo.com/sms/json ↗
Unit price: SMS to Poland: $0.04843 per outbound message ↗
MCP tools: 8: balance, list-applications, create-application, search-available-numbers, SMS, whatsapp-send-text … ↗		Auth method differs per sub-API (API key/secret vs JWT), which agents must account for.—
WhatsApp Business Cloud APISend/receive WhatsApp messages, template messages, and media programmatically via Graph API.OAuth 2.0
Authorization: Bearer <system-user access token>		communityFree: non-template (service) messages inside an open 24h customer service window; template messages billed per message (per-message pricing since 2025-07-01)Free plan: Non-template messages inside an open 24h customer service window are free; template messages billed per message ↗
Rate limits: Up to 80 messages/s per business phone number by default (upgradable) ↗
OAuth scopes: whatsapp_business_messaging, whatsapp_business_management ↗
Example call: send a text message: POST https://graph.facebook.com/v25.0/{phone-number-id}/messages ↗
Unit price: Non-template messages inside an open customer service window are free; template messages are charged per delivered message at rates by category and recipient country (rate cards linked on page) ↗
MCP tools: 9: send_text_message, send_image_message, send_template_message, get_message_templates, create_message_template, upload_media … ↗		Requires Meta Business verification and pre-approved message templates for outbound marketing/utility messages outside the 24h session window.GitHub 6,310★ lharries/whatsapp-mcp

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