WhatsApp and SMS

WhatsApp Cloud API

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Per delivered message to US numbers: $0.0034 for utility, authentication and service, $0.025 for marketing.

Meta's own API for sending and receiving WhatsApp messages from your app, hosted by Meta and billed per delivered message.

Best for: A SaaS that sends login codes and billing reminders on WhatsApp and wants the lowest official rate with no middleman fee.

Twilio

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WhatsApp: Meta's rate + $0.005 per message sent or received. SMS to the US: $0.0083 per segment plus carrier fees.

Developer API for SMS, WhatsApp, voice and email, with SDKs in every major language.

Best for: A SaaS selling in several countries that wants SMS and official WhatsApp behind one API and one bill.

Z-API

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R$99.99/month per instance (number); R$89.99 each from 10 instances.

Brazilian REST API that connects a regular WhatsApp number to your app for a flat monthly fee, outside Meta's official API.

Best for: An early MVP that needs to send free-form WhatsApp messages today, with no template approval and no per-message cost.

Zenvia

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Packages from R$100/month: SMS R$0.10, WhatsApp template R$0.55; software plans from R$600/month.

Brazilian customer messaging platform for SMS, official WhatsApp, RCS and email, with prepaid message packages in reais.

Best for: A B2B SaaS in Brazil that wants SMS and official WhatsApp billed in reais, with local support and a CNPJ-based contract.