Pinnacle

One API for RCS, iMessage, MMS, and SMS with developer SDKs

Pinnacle is a messaging API that lets developers send RCS, iMessage, MMS, and SMS through a single interface, addressing the need to reach US phones across Android and Apple devices without stitching together multiple vendors. The platform handles carrier registration compliance, webhooks, conversation logs, and analytics, and it offers SDKs for Python, TypeScript, and Ruby, plus an MCP server that exposes messaging tools to AI agents such as Claude and Cursor.

Capabilities include rich RCS cards, carousels, and quick replies, MMS image and video bubbles, and universal SMS delivery, along with phone number lookup for validating recipients before sending. The MCP server covers sends, audiences, blasts, scheduling, compliance, and contacts. Enterprise controls such as SSO and audit logs are included, and iMessage access is onboarded per account.

Pinnacle is aimed at developers and teams sending marketing campaigns, transactional alerts, and conversational messages. Pricing uses a flat monthly base covering the platform, support, and registration paperwork, plus per-message rates that drop with volume; carrier fees are included in the published rates, and registration fees are billed separately. The service is month-to-month with no minimums, and custom volume-based pricing is available for higher-volume customers.

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