How to migrate from SendPulse to Sinch

SendPulse is a multi-channel marketing and messaging platform that bundles email, SMS, and chat apps behind a unified dashboard and REST API. Sinch is a cloud communications platform exposing messaging, voice, and email APIs. On the messaging.dev Score, SendPulse rates 63/100 and Sinch 92/100; this guide covers the concrete API and capability changes involved in moving between them.

What you gain and what you lose

Channels. Both providers cover SMS, WhatsApp, Viber, Facebook Messenger, Telegram, and email, so no channel is lost in the move. Sinch adds four that SendPulse does not offer: MMS, RCS, Apple Messages for Business, and Voice.

Compliance. Both are GDPR-aligned. Sinch additionally lists ISO 27001, SOC 2, and HIPAA; SendPulse lists none of the three.

Data residency. Both run US and EU servers. Sinch adds explicit data-residency choice plus regions in APAC, Australia, and Brazil, where SendPulse offers no region selection.

Infrastructure. Sinch reports direct operator connections and a 99.95% uptime SLA; SendPulse lists no published SLA and no direct operator connections. Sinch also supports SMPP alongside REST and SMTP.

Pricing and free credit. Both are pay-as-you-go and both include free developer credit — SendPulse a free plan (15,000 emails/mo) plus 10 test SMS, Sinch a trial credit whose amount is unspecified. SendPulse adds a free-forever plan and monthly subscription tiers; Sinch adds volume and committed-use pricing. Sinch’s quoted rate (~$0.0075 per US SMS segment) is stated plus carrier fees.

SDKs, sandbox, docs. Documentation quality is rated high for both. SDK coverage overlaps on PHP, Python, Java, Node.js, and C#; SendPulse also ships a Ruby SDK that Sinch does not. Sinch provides a sandbox test environment; SendPulse does not.

For the full side-by-side, see the SendPulse vs Sinch comparison.

How the request format differs

SendPulse quickstart:

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"
  }'

Sinch quickstart:

curl -X POST 'https://us.sms.api.sinch.com/xms/v1/YOUR_SERVICE_PLAN_ID/batches' \
  -H 'Authorization: Bearer YOUR_API_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{"from":"+15005550006","to":["+15551234567"],"body":"Hello from Sinch"}'

Endpoint. SendPulse posts to a single fixed path, https://api.sendpulse.com/sms/send. Sinch posts to a region-scoped host with your service plan in the path: https://us.sms.api.sinch.com/xms/v1/{service_plan_id}/batches. You must choose the correct regional host (the example uses us.) and substitute your service_plan_id.

Authentication. SendPulse uses OAuth2 client_credentials: you POST client_id/client_secret to https://api.sendpulse.com/oauth/access_token to receive a one-hour Bearer token (or use a static API key), then send Authorization: Bearer <token>. Sinch uses a static API token directly in the Authorization: Bearer header, so the token-exchange and refresh step goes away.

Payload. The fields map cleanly: rename sender to from, rename the phones array to to, and keep body unchanged. Note that SendPulse’s example uses an alphanumeric sender ID ("SenderName") while Sinch’s uses an E.164 number.

Migration checklist

1. Create a Sinch account, generate an API token, and note your service_plan_id.
2. Map the request fields: sender → from, phones → to, keep body.
3. Replace the OAuth2 token-exchange with the static Bearer token and remove any refresh logic.
4. Re-point your sending code to the Sinch base URL and update the endpoint host/path.
5. Re-test in Sinch’s sandbox before sending live traffic — see how to start with Sinch.
6. Update delivery/status webhooks and callbacks to Sinch’s format.
7. Run both providers in parallel and compare delivery results.
8. Cut over once the results match.

Watch out for

• Fewer countries. Sinch lists 150 countries covered versus SendPulse’s 200.
• No Ruby SDK. SendPulse ships one; on Sinch, Ruby users fall back to raw REST.
• Region-pinned endpoint. You must pick the right regional host and include service_plan_id, unlike SendPulse’s single fixed URL.
• Unspecified trial credit. Sinch’s free credit amount is not stated in the dataset, where SendPulse specifies 15,000 emails/mo plus 10 test SMS.