Twilio REST API

Name: Twilio REST API API
Brand: Twilio REST API
Availability: InStock

✓ Official Vendor SpecCommunicationsSms Messagingbasic197 EndpointsREST

For Agents

Send SMS/MMS messages, make voice calls, purchase phone numbers, and manage call recordings programmatically across 180+ countries.

Quickstart

Get started with Twilio REST API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"send an SMS message"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Twilio REST API API.

Send SMS and MMS messages to mobile numbers worldwide with delivery status tracking

Initiate outbound voice calls with TwiML-based call flow control and recording

Purchase and configure phone numbers across 180+ countries with local, mobile, and toll-free options

Record and transcribe voice calls with configurable recording channels and formats

GET STARTED

Start building with Twilio REST API API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use Twilio REST API API for, with concrete tasks.

★ AI Agent SMS Notifications

AI agents send SMS notifications through Jentic by searching for the send message operation, loading the schema, and executing with To, From, and Body fields. Jentic handles Basic auth credential injection from the MAXsystem vault so agents never handle Account SID or Auth Token directly. A single POST to /2010-04-01/Accounts/{AccountSid}/Messages.json delivers the message with optional media URLs and status callback.

Send an SMS to +15551234567 from +15559876543 with body 'Your order has shipped' and verify the message SID is returned in the response

Automated Voice Calls

Trigger outbound voice calls for appointment reminders, security alerts, or customer callbacks. The API initiates the call and directs it to a TwiML document that defines the call flow — text-to-speech greetings, menu options, recordings, or forwarding. Status callbacks report call progress from initiated through completed, enabling retry logic for unanswered calls.

Initiate a voice call to +15551234567 using a TwiML URL that plays a text-to-speech appointment reminder and check the call status via GET /2010-04-01/Accounts/{AccountSid}/Calls/{Sid}.json

Phone Number Provisioning

Search and purchase local, mobile, or toll-free phone numbers in 180+ countries for SMS and voice capabilities. Filter available numbers by area code, country, and capabilities (SMS, MMS, voice, fax). Purchased numbers are immediately available for sending and receiving messages or calls, with configurable webhook URLs for inbound traffic routing.

Search for available toll-free numbers in the US via GET /2010-04-01/Accounts/{AccountSid}/AvailablePhoneNumbers/US/TollFree.json and purchase the first result

Call Recording and Transcription

Record voice calls for compliance, quality assurance, or training purposes. Recordings can capture both legs of a call or a single channel. Completed recordings are accessible via the API for playback or download. Transcription converts recorded audio to text, enabling search and analysis of call content without manual review.

Start a recording on an active call via POST /2010-04-01/Accounts/{AccountSid}/Calls/{CallSid}/Recordings.json and retrieve the completed recording URI

Key Endpoints

197 endpoints — send and receive sms and mms messages, initiate and control voice calls, manage phone numbers, and handle conference calls across 180+ countries.

METHOD

PATH

DESCRIPTION

POST

/2010-04-01/Accounts/{AccountSid}/Messages.json

Send an SMS or MMS message

GET

/2010-04-01/Accounts/{AccountSid}/Messages/{Sid}.json

Retrieve a message by SID

POST

/2010-04-01/Accounts/{AccountSid}/Calls.json

Initiate an outbound voice call

GET

/2010-04-01/Accounts/{AccountSid}/Calls/{Sid}.json

Get call details and status

POST

/2010-04-01/Accounts/{AccountSid}/Calls/{CallSid}/Recordings.json

Start recording a call

GET

/2010-04-01/Accounts/{AccountSid}/AvailablePhoneNumbers/{CountryCode}/Local.json

Search available local phone numbers

GET

/2010-04-01/Accounts/{AccountSid}/Balance.json

Get current account balance

POST

/2010-04-01/Accounts/{AccountSid}/Conferences/{ConferenceSid}/Participants/{CallSid}.json

Update a conference participant

POST

/2010-04-01/Accounts/{AccountSid}/Messages.json

Send an SMS or MMS message

GET

/2010-04-01/Accounts/{AccountSid}/Messages/{Sid}.json

Retrieve a message by SID

POST

/2010-04-01/Accounts/{AccountSid}/Calls.json

Initiate an outbound voice call

GET

/2010-04-01/Accounts/{AccountSid}/Calls/{Sid}.json

Get call details and status

POST

/2010-04-01/Accounts/{AccountSid}/Calls/{CallSid}/Recordings.json

Start recording a call

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Twilio Account SID and Auth Token are stored encrypted in the Jentic vault (MAXsystem). Agents receive pre-authenticated requests — raw credentials never enter the agent context or appear in logs.

Intent-based discovery

Agents search by intent (e.g., 'send an SMS message') and Jentic returns matching Twilio operations with their input schemas and required parameters, so the agent can call the correct endpoint without navigating 197 endpoints manually.

Time to first call

Direct Twilio integration: 2-4 days for auth setup, number provisioning, webhook configuration, and error handling. Through Jentic: under 1 hour — search, load schema, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Telnyx API

Telnyx offers comparable SMS, voice, and number management with per-minute billing and carrier-grade SIP

Choose Telnyx when you need lower per-minute voice costs, carrier-grade SIP trunking, or a single API for both communications and AI inference.

Alternative

Plivo SMS API

Plivo provides SMS and voice APIs with competitive international pricing to 200+ countries

Choose Plivo when international SMS pricing is the priority or when you need WhatsApp messaging alongside SMS.

Alternative

Vonage SMS API

Vonage (Nexmo) provides SMS delivery with delivery receipts and inbound messaging support

Choose Vonage when you need strong delivery receipt handling in specific international markets or existing Vonage voice infrastructure.

Complementary

Twilio SendGrid Mail API

SendGrid adds transactional email delivery alongside Twilio SMS and voice

Use SendGrid alongside Twilio when the notification workflow spans both email and SMS/voice channels.

FAQs

Specific to using Twilio REST API API through Jentic.

What authentication does the Twilio REST API use?

The Twilio REST API uses HTTP Basic authentication with your Account SID as the username and Auth Token as the password. Through Jentic, these credentials are stored encrypted in the MAXsystem vault and injected automatically into the Basic auth header, so agents never handle the raw Account SID or Auth Token.

Can I send MMS messages with images through the Twilio API?

Yes. Include a MediaUrl parameter in your POST to /2010-04-01/Accounts/{AccountSid}/Messages.json pointing to a publicly accessible image URL. The API supports up to 10 media URLs per message for images, GIFs, and other supported MIME types.

What are the rate limits for sending SMS with Twilio?

Long code numbers support 1 SMS per second in the US. Toll-free numbers support up to 3 messages per second. Short codes can send 30-100 messages per second depending on the carrier. The API returns HTTP 429 when limits are exceeded, and messages are queued for retry.

How do I send an SMS through Jentic with the Twilio API?

Search for 'send an SMS message' in Jentic to find the Twilio Messages endpoint. Load the operation schema, then execute with To (recipient number), From (your Twilio number), and Body (message text). Install with pip install jentic and use the search-load-execute pattern. Jentic handles Basic auth injection automatically. Get started at https://app.jentic.com/sign-up.

Can I check whether an SMS was delivered?

Yes. Retrieve the message via GET /2010-04-01/Accounts/{AccountSid}/Messages/{Sid}.json and check the Status field. Values include queued, sending, sent, delivered, and failed. You can also configure a StatusCallback URL in the send request to receive real-time delivery webhooks.

How many countries does Twilio support for phone numbers?

Twilio offers phone numbers in 180+ countries. Use GET /2010-04-01/Accounts/{AccountSid}/AvailablePhoneNumbers.json to list supported countries, then filter by country code and number type (local, mobile, toll-free) to find available numbers for purchase.