Communication · Integration
Twilio
Add Twilio to your product for your customers, and give your AI agents governed access to it.
Twilio is a programmable messaging and voice API rather than a workspace, so what you work with is messages, calls, phone numbers, verify services and the status callbacks Twilio sends back. The fact that defines every integration built on it is that a successful API response only means Twilio accepted the message. Delivery happens afterwards, and a message can still fail at the carrier, be filtered, or reach a number that no longer takes text, arriving minutes later as a callback carrying an error code. Your product therefore has to treat sending and delivery as two separate facts and keep that callback endpoint dependable. fastn holds each customer's account credentials and keeps up with Twilio's API changes.
In your product
Embedded for your customers. Per-tenant auth, no per-customer code, maintained by fastn.
Let each customer send from their own Twilio account and their own numbers, so replies come back to them.
Record a message as accepted, then update it when the delivery or failure callback arrives with its error code.
Run phone verification through a verify service instead of building one-time codes and retry logic yourself.
Read call records and recordings so your product can show what happened on a call without a separate console.
For your AI agents
Governed, audited access for the agents you build, through the MCP server.
An agent checks whether a message reached a number and reports the error code if it did not.
An agent sends an approved message from a permitted number, with the recipient and the send logged.
An agent summarises today's calls to one number from their duration and status alone.
Example prompt
Was the one-time code we sent to this number delivered, and if not, what error did the carrier return?
Set up Twilio in 4 steps
- 01Enable the Twilio connector from your fastn dashboard.
- 02Have each customer authorise their own Twilio account, so calls run under their credentials rather than a shared key.
- 03Decide which messages, calls, phone numbers and status callbacks your product needs, and wire the status callback, because a 2xx only means Twilio accepted the message.
- 04Call it from your product and expose it to your agents through the same governed connection.
Why teams use the Twilio integration
What you get by embedding it with fastn instead of building it yourself.
- Ship a Twilio integration without building it. Your customers connect their own Twilio account inside your product and work their messages, conversations and participants there, with no per-customer code on your side.
- Handle the part that actually costs time: anything sent is user-visible, so duplicates and misfires are immediately embarrassing. fastn owns the auth, token refresh, rate limits, pagination and breaking-change fixes, so a Twilio update is not your on-call problem.
- One integration serves your product and your agents. The same governed Twilio connection powers in-product features and gives AI agents scoped, audited access, so you put the right message in front of the right team automatically without wiring it twice.
Used by these teams
Compare with
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Google CalendarTwilio integration FAQ
How do I add a Twilio integration to my product?
Enable the Twilio connector in your fastn dashboard, then let each customer authenticate their own Twilio account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no Twilio client code in your app and no per-customer branch in your codebase. Setup is 4 steps.
Do my customers each connect their own Twilio account?
Yes. Every connection is scoped to the individual customer, so each authorises their own Twilio account and only ever sees their own messages, conversations and participants. That per-tenant isolation is the point of an embedded integration: you support the long tail of customer setups without maintaining an integration per customer.
Can AI agents use this Twilio integration?
Yes. The same connection is exposed to your agents through the fastn MCP gateway, with permissions scoped per tenant and every call audited. An agent checks whether a message reached a number and reports the error code if it did not.
Who maintains the Twilio integration?
fastn does. When Twilio changes an endpoint, deprecates a field or alters its auth, the fix lands in the connector rather than in your backlog, and your customers' connections keep working.
Does each customer connect their own Twilio account?
Yes. Every customer authorises their own Twilio account, so messages, meetings and notifications originate from their workspace under their permissions. You never proxy through a shared account, which also means a customer revoking access affects only their own connection.
How are duplicate notifications avoided?
Sends are deduplicated per event, so a retry after a network failure does not post the same message twice into a channel people are reading.
What can I build with the Twilio integration?
A common starting point: let each customer send from their own Twilio account and their own numbers, so replies come back to them. Teams also use it for the other use cases listed above, and expose it to agents for governed reads and writes.
How much does the Twilio integration cost?
It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding Twilio does not change your per-connector cost. You can start free with 3 connected accounts.
Add Twilio to your product
Start free with 3 connected accounts. No sales call required, and no per-customer integration code.