How to migrate from SendPulse to Telnyx

SendPulse is a multi-channel marketing and messaging platform that exposes email, SMS, and chat channels through one REST API, while Telnyx is a licensed telecom carrier running a CPaaS platform over its own private global IP network. On the messaging.dev Score, SendPulse rates 63/100 and Telnyx 78/100. This guide covers what actually changes at the API level when you move your sending code across, and how to do it without surprises.

What you gain and lose

Channels. Moving to Telnyx you gain MMS, RCS, and voice. You keep SMS, WhatsApp, and email. You lose three chat channels SendPulse carries: Viber, Facebook Messenger, and Telegram — Telnyx has no equivalent, so if any of those are in your stack you will need a second provider for them. Neither offers Apple Messages for Business.

Compliance and residency. SendPulse is GDPR-aligned. Telnyx adds ISO 27001, SOC 2, and HIPAA on top of GDPR — a strict superset, so this is a clear gain. Both run US and EU servers, but Telnyx also lets you choose data residency (SendPulse does not) and adds Asia-Pacific and South America regions.

Pricing and credit. Both bill pay-as-you-go. SendPulse prices per message by destination country (from €0.01/SMS) and offers a free-forever plan (15,000 emails/mo plus 10 test SMS). Telnyx bills per message part (from $0.004 per outbound SMS part in the US, plus carrier fees) with volume discounts and custom contracts, but has no free developer credit.

SDKs, sandbox, docs. Both providers’ docs rate high. SDK coverage overlaps on Node.js, Python, Ruby, Java, and PHP; Telnyx adds Go and .NET, SendPulse lists C#. Neither ships a hosted sandbox, so you test against live credentials on both sides. For a fuller walkthrough of the target, see how to start with Telnyx or the side-by-side comparison.

How the request format differs

Source (SendPulse):

curl -X POST https://api.sendpulse.com/sms/send \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "sender": "SenderName",
    "phones": ["380931258293"],
    "body": "Hello from SendPulse"
  }'

Target (Telnyx):

curl -X POST https://api.telnyx.com/v2/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "from": "+15551234567",
    "to": "+15559876543",
    "text": "Hello, world!"
  }'

Endpoint. The base URL changes from https://api.sendpulse.com/sms/send to https://api.telnyx.com/v2/messages.

Authentication. SendPulse uses OAuth2 client_credentials: you POST client_id/client_secret to https://api.sendpulse.com/oauth/access_token, receive a one-hour Bearer token (or use a static API key), then send it as Authorization: Bearer. Telnyx uses a static Bearer API key directly in the Authorization header — no token-exchange call and no hourly expiry, so you can delete your token-refresh logic.

Payload mapping. SendPulse’s sender (an alphanumeric sender ID) maps to Telnyx’s from, but Telnyx expects a provisioned E.164 number like +15551234567, not a name. The recipient array phones: ["..."] collapses to a single to string, and the message field body becomes text.

Migration checklist

1. Create a Telnyx account (self-onboarding is supported) and generate an API key.
2. Provision a messaging profile and an E.164 sending number, since from must be a real number, not a sender ID.
3. Map the request fields: sender → from, phones[] → to, body → text, and swap the base URL.
4. Replace the OAuth2 token exchange with a single stored Bearer API key.
5. Re-point your sending code to https://api.telnyx.com/v2/messages.
6. Re-test with a live key and a real test number — Telnyx has no sandbox, so keep the test volume small.
7. Re-point your delivery-status webhooks/callbacks to Telnyx’s message events.
8. Run both providers in parallel on a traffic subset, then cut over and decommission SendPulse once delivery and cost check out.

Watch out for

• Lost channels: Viber, Facebook Messenger, and Telegram are not available on Telnyx.
• No free credit or sandbox: you test against live, billable traffic from day one.
• Sender IDs: from must be a provisioned E.164 number, not an alphanumeric name.
• Per-part billing: multi-part (long or Unicode) messages cost more than a flat per-message estimate, and US pricing adds carrier fees.
• Coverage: Telnyx lists 130 countries versus SendPulse’s 200 — confirm your destinations are supported before cutting over.