Twilio Messaging provides pay-per-use APIs for SMS, MMS, WhatsApp, and voice messaging with no monthly minimums. Uses per-message and per-minute billing with global coverage.

Twilio offers flexible, usage-based pricing across SMS, MMS, voice, email, WhatsApp, and video APIs. SMS costs $0.0079-0.0083 per message segment in the US with carrier surcharges. Each service is billed separately. New accounts receive $15 free credit.
Flexible SMS, MMS, Voice, WhatsApp and Video APIs
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AI-powered email marketing and SMS unified platform
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Klaviyo is an autonomous B2C CRM that unifies email, SMS, RCS, WhatsApp, and mobile push marketing with AI agents for personalized omnichannel campaigns. Serves 196,000+ customers managing 8 billion customer profiles.
AI-powered B2B SMS outreach and lead generation
B2BSMSMail is a B2B-focused SMS platform using AI to find, verify, and connect with qualified business leads through hyper-personalized SMS campaigns with built-in compliance.
SMS and two-way texting platform for sales teams and customer engagement
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Salesmsg is a sales-focused SMS platform starting at $25/month for 500 messages with 2-way SMS/MMS texting. Includes centralized inbox, automation, CRM integrations, and team collaboration features.