About SMSRiver
SMSRiver builds real-time telephony intelligence, public verification inboxes, and programmatic developer APIs for modern engineering teams and autonomous AI agents.
The Developer Telephony Problem
Testing two-factor authentication (2FA), OTP tokens, and transactional SMS flows has historically forced developers to buy expensive private numbers, deal with complex telecom aggregator contracts, or risk burning their personal mobile numbers during CI/CD test runs.
SMSRiver replaces brittle phone verification setups with instant, carrier-grade test lines and transparent telephony intelligence. Developers and AI coding agents can verify OTP codes in seconds without friction.
Technical Phone-Number Intelligence
A phone number can conform to E.164 without being assigned, active, or reachable. SMSRiver provides deep technical intelligence to inspect numbering-plan validity, carrier attribution, and line-type classification (mobile, landline, VoIP).
We focus strictly on structural technical intelligence: helping developers understand telephone numbering plans, troubleshoot deliverability, and optimize SMS routing, never private surveillance or personally identifiable data discovery.
First-Class AI Agent & MCP Integration
Autonomous coding agents like Claude Code, Cursor, and Windsurf require machine-readable discovery protocols to interact with external communications infrastructure.
SMSRiver is engineered with Model Context Protocol (MCP) server endpoints, OpenAPI 3.1.0 specifications, and text/markdown content negotiation, giving AI agents native tools to fetch numbers, read verification tokens, and validate webhooks.
Global Telephony Infrastructure Across 50+ Markets
Our virtual carrier pooling infrastructure maintains active direct routes and SMPP peering with Tier-1 telecommunications carriers across North America, Europe, Asia-Pacific, Latin America, and the Middle East. Every number pool undergoes automated continuous health checks to verify carrier reachability, median delivery latency, and OTP delivery rates.