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POST
/
agents
/
phone-numbers
/
providers
Create Provider
curl --request POST \
  --url https://api.cartesia.ai/agents/phone-numbers/providers \
  --header 'Authorization: Bearer <token>' \
  --header 'Cartesia-Version: <cartesia-version>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "account_sid": "<string>",
  "api_key_sid": "<string>",
  "api_key_secret": "<string>",
  "region": "us1"
}
'
{
  "id": "<string>",
  "account_sid": "<string>",
  "api_key_sid": "<string>",
  "region": "us1"
}

Authorizations

​
Authorization
string
header
required

Cartesia API key (sk_car_...). Get one at play.cartesia.ai/keys.

Headers

​
Cartesia-Version
enum<string>
required

API version header.

Available options:
2026-03-01
Example:

"2026-03-01"

Body

application/json

Request body for linking a telephony provider. Discriminated by type. Twilio:

  • Credentials are validated against Twilio before the provider is created
  • Each account SID + region combination can only be linked once
​
type
enum<string>
required

Must be "twilio".

Available options:
twilio
​
account_sid
string
required

Your Twilio account SID.

​
api_key_sid
string
required

A Twilio API key SID.

​
api_key_secret
string
required

The corresponding API key secret.

​
region
enum<string>
default:us1

The Twilio region the phone number and API key are configured for. us1 (US), ie1 (Ireland), au1 (Australia). Default is us1.

Available options:
us1,
ie1,
au1

Response

Provider created.

A telephony provider account.

​
type
enum<string>
required

Always "twilio".

Available options:
twilio
​
id
string
required

Unique identifier for the provider.

​
account_sid
string
required

The Twilio account SID.

​
api_key_sid
string
required

The Twilio API key SID (partially masked).

​
region
enum<string>
default:us1
required

The Twilio region the phone number and API key are configured for. us1 (US), ie1 (Ireland), au1 (Australia). Default is us1.

Available options:
us1,
ie1,
au1