Telynx - SMS Notifications & Verifications

Available To

Free for the following exchange plans:

• Cloud Plans:

  • Enterprise

• On-Premise Plans:

  • Enterprise Unlimited

What Is It?

The Telnyx Plugin is an SMS gateway integrated into HollaEx exchanges. Powered by Telnyx, it sends transactional SMS messages from your exchange — deposit/withdrawal notifications and verification codes for actions like withdrawals, password resets, and 2FA — using your Telnyx account and your own sender phone number.

The plugin auto-formats numbers, picks the right routing for each destination country, and integrates directly with the exchange's user verification flow so users who opt in to SMS receive the same codes they would otherwise receive via email or authenticator app.

Who Needs It?

This plugin is suitable for any HollaEx exchange operator that:

• Wants to send SMS notifications for deposits and withdrawals.

• Wants to offer SMS as a second factor for sensitive actions (withdrawals, password reset).

• Already has a Telnyx account, or prefers Telnyx's pricing/coverage over alternative SMS providers.

How to Use It?

You can simply install the plugin from the Plugins section inside the Operator Control. After installation, input your Telnyx API key and sender number.

1. Get your Telnyx credentials

1. Log in to the Telnyx Mission Control Portal.

2. Go to Auth → API Keys and create a new V2 API key. Copy it somewhere secure.

3. Go to Numbers → My Numbers and confirm the sender number you want to use. The number must be in E.164 format (e.g. [phone]).

4. Make sure the number has the Messaging profile enabled.

2. Configure the plugin

Open the plugin in the Operator Control and set the following fields:

Field	Required	Default	Description
apiKey	yes	—	Telnyx V2 API key.
fromNumber	yes	—	Telnyx sender phone number in E.164 format (e.g. [phone]).
send_sms_deposit	no	true	Send deposit SMS notifications to users.
send_sms_withdrawal	no	true	Send withdrawal SMS notifications to users.
send_sms_user_verification	no	true	Send user-action verification codes (e.g. withdrawal, password reset) via SMS when the user has opted in.

Once configured, the exchange will automatically route SMS through Telnyx for any user who has a verified phone number and has opted in to SMS notifications.

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Benefits for HollaEx Operators

The Telnyx plugin gives exchange operators a reliable, low-cost SMS channel for both transactional alerts and security-critical verification codes. Telnyx's global coverage and direct carrier connections deliver predictable latency and high throughput, so users get their codes in seconds even during peak load. Combined with the exchange's existing email and authenticator-app channels, SMS rounds out a multi-factor security posture that meets users wherever they are.