No. 59of 77 ·Transactional SMS Software

Prelude Transactional SMS API

Name: Prelude Transactional SMS API
Price: 0.05 EUR

Web · API

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Freedom report

One barScore 4.9

Free tierNo free tier
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Prelude Transactional SMS API is ranked #59 of 77 in transactional SMS software on Freedom251. It runs on API, Web. There is no free plan. A free trial is offered.

Prelude Transactional SMS API plans and pricing

All plans

Pay as you go €0.05 once Per verification; SMS message costs are additional and vary by country. Country- and volume-based pricing · No hidden fees or subscriptions prelude.so · 4 Oct 2026

Compared on transactional SMS software

Pay-as-you-go: Yes
SMS API: Yes
Delivery status: Yes
Webhooks: Yes
Two-way messaging: Yes

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The record

What it does: Prelude’s Transactional SMS API sends automated service messages such as OTPs, order confirmations, payment notifications, and reminders.
API: The API uses REST and supports single or bulk message sending through POST requests.
Routing: Prelude says it routes messages by region and carrier and supports delivery to over 230 countries.
Message handling: The API automatically manages language and encoding and supports dynamic fields such as name, language, and time zone.
Monitoring: The service provides delivery receipts, real-time message status, analytics, cost monitoring, and detailed API logs.
Integration resources: Prelude offers technical documentation, code samples, sandbox testing, dashboard test numbers, and free credits for real message testing.
Performance: Prelude advertises average delivery under three seconds, a delivery rate above 98%, and a 99.95% uptime SLA.
Security: Prelude states that communications use HTTPS/TLS encryption and token-based API authentication, with hosting in U.S. and EU data centers.
Privacy and compliance: Prelude says its infrastructure complies with GDPR and U.S. privacy standards and that only essential data is stored for delivery tracking.
Certifications: Prelude’s Trust Center lists ISO 27001:2022 and SOC 2 Type 1 and Type 2 reports.
Support: Prelude offers human support via chat, email, and a dedicated Slack channel for integration, deliverability, webhook, and troubleshooting help.
Pricing model: Pricing depends on destination country and sending volume, with no setup fees or minimum commitment stated on the product page.
Founded: 2022

Where it ranks on Freedom251

Best Transactional SMS Software in 2026#59 of 77

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Sources

prelude.so/transactional-api· checked 4 Oct 2026
trust.prelude.so· checked 4 Oct 2026