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OtterBlocx is a developer-first SMS, 2FA, and messaging API platform built for the businesses standard carriers tend to reject. If you operate in a regulated industry — firearms, lending, healthcare-adjacent, financial services, anything where 10DLC brand registration gets bounced — you already know the pain. Long onboarding cycles. Opaque rejections. Compliance burden dropped in your lap with a "good luck." We built OtterBlocx to fix that. WHAT WE DO • Programmable APIs for SMS, MMS, RCS, email, voice (coming soon), and Telegram • 2FA verification — flat rate per verification, SMS included, not metered separately • Phone number lookup, email lookup, and number management • 10DLC registration assistance for regulated verticals • Compliance disclosure copy generator (TCPA, 10DLC, CAN-SPAM, GDPR, CCPA / CPRA) that updates as carrier rules change WHO IT'S FOR • Developers who want clean APIs and real documentation • Companies in regulated industries who need a carrier partner that says yes • Teams replacing legacy SMS providers and tired of separate verification bills • Founders who want messaging infrastructure handled in week one, not month six WHAT MAKES US DIFFERENT • Flat-rate 2FA. Most providers charge for the verification and the SMS — we don't. • Compliance copy generated in the dashboard, ready to paste. • MCP server support — use OtterBlocx directly inside Claude, Cursor, and other MCP-compatible tools. • Real humans on support when carriers say no. Otter Technologies Inc. is based in Cheyenne, Wyoming. Governing law: Wyoming. Arbitration: AAA. Talk to us: hello@otterblocx.com Read the docs: api.otterblocx.com Get started: otterblocx.com