For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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Changelog

February 19, 2026
February 19, 2026
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February 6, 2026

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RCS Fallback Messages

Never lose a message again — RCS messages now automatically fall back to SMS or MMS when a recipient’s device doesn’t support RCS.

What’s new?

RCS fallback messages

Include a fallback object in your RCS send request with a from phone number and text or mediaUrls. If RCS delivery fails, the message is resent as SMS or MMS automatically.

  • SMS fallback when only text is provided (≤3072 characters)
  • MMS fallback when mediaUrls are included or text exceeds 3072 characters
  • Original RCS message status updates to FALLBACK_SENT
  • Webhook delivers fallbackMessage details so you can track both legs

Learn more →

Have questions? Reach out to us - founders@pinnacle.sh