Carrier-grade SMS pools & developer testing sandbox
Test OTP verification codes in public inboxes or simulate synthetic cellular webhooks via REST API and Model Context Protocol (MCP).
Active Telephone Numbers
Select an inbox to view incoming SMS in real time. Aggregated inboxes refresh on-demand when loaded.
Public Aggregated Pools (38 Numbers)
Built for Developer CI/CD & Coding Agents
Integrate synthetic SMS testing directly into your continuous integration suites and AI agent workflows via REST API and Model Context Protocol.
Trigger an authentic cellular SMS event directly against your webhook URL without paying carrier fees.
-H "Authorization: Bearer srv_live_demo123" \
-H "Content-Type: application/json" \
-d '{"to": "+12025550101", "from": "TestCorp", "body": "Your OTP is 492019"}'
Equip Cursor, Claude Code, and Antigravity agents with autonomous SMS verification testing tools.
"mcpServers": {
"smsriver": {
"command": "uvx",
"args": ["smsriver-mcp", "--api-key", "srv_live_..."]
}
}
}
Direct telecom webhook links ingest cellular OTP arrivals within 1.2s median p95 latency.
Twilio and Plivo webhook payloads verified cryptographically with timing-safe SHA256 comparisons.
Simulate thousands of test verification loops without incurring carrier long-code fees.
Inventory Architecture & Privacy Warning
Native Carrier Lines (Verified)
We operate 2 direct US telephone numbers via approved telecom carrier links. Inbound webhooks are ingested directly with sub-2s latency, cryptographic HMAC verification, and automatic deduplication.
Aggregated Pools (99% Community Mirrored)
The majority of international numbers are aggregated from public directories (SMSDock, SMS24, ReceiveSMS.co, etc.). Messages are retrieved strictly on-demand behind a rotating proxy when a visitor loads an inbox, preventing idle compute waste.