TELECOM INFRASTRUCTURE & DEVELOPER SANDBOX

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).

Explore Free Numbers Developer Sandbox & MCP

live-inbound-stream • +1 (202) 555-0101 ONLINE

[200 OK] Inbound Webhook 2s ago • 1.2s latency

Sender: GitHub-Auth

Your verification code is 849-201

[200 OK] Inbound Webhook 14s ago • 0.9s latency

Sender: Stripe-Verify

Security token: 391-824

Carrier: Plivo Telecom Direct Open Inbox

Telecom & Developer Integration Ecosystem

Active Telephone Numbers

Select an inbox to view incoming SMS in real time. Aggregated inboxes refresh on-demand when loaded.

All (76) CA DE FR GB NL PL SE US

Direct Carrier Lines • Fast Delivery Pilot

Carrier Verified

US Carrier Pool Online (Realtime)

+12025550143

Country: US Carrier: PLIVO Latency: <1.8s

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US Carrier Pool Online (Realtime)

+12025550198

Country: US Carrier: TWILIO Latency: <1.8s

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Public Aggregated Pools (74 Numbers)

On-Demand Mirror

US Pool smsdock

+13058371468

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+13103966132

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+16024140940

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+17734859800

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+13104383954

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+12012893926

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+17022138460

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+190322768

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+190322656

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+190322450

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US Pool smss_net

+14692466072

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+13000426590

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+16846765998

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+16597232054

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+11374014040

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+12695828619

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+12083797168

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+12029462199

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+16319203692

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+12028516510

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+12057010563

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+18303760797

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+12029772796

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+12057010564

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+14484188136

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+12017339410

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+19895895384

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+13344633127

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+12017205158

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+12083797171

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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.

Synthetic Inbound Event API

Trigger an authentic cellular SMS event directly against your webhook URL without paying carrier fees.

curl -X POST https://smsriver.com/api/v1/synthetic/sms/ \
  -H "Authorization: Bearer srv_live_demo123" \
  -H "Content-Type: application/json" \
  -d '{"to": "+12025550101", "from": "TestCorp", "body": "Your OTP is 492019"}'

Model Context Protocol (MCP)

Equip Cursor, Claude Code, and Antigravity agents with autonomous SMS verification testing tools.

{
  "mcpServers": {
    "smsriver": {
      "command": "uvx",
      "args": ["smsriver-mcp", "--api-key", "srv_live_..."]
    }
  }
}

Sub-2s Webhook Pipeline

Direct telecom webhook links ingest cellular OTP arrivals within 1.2s median p95 latency.

HMAC Signature Security

Twilio and Plivo webhook payloads verified cryptographically with timing-safe SHA256 comparisons.

Zero Per-SMS Cost

Simulate thousands of test verification loops without incurring carrier long-code fees.

Inventory Architecture & Privacy Warning

Public Inboxes are Open to the World: All incoming text messages, confirmation links, and verification codes sent to these numbers are publicly readable by anyone. Never use these numbers for banking, personal accounts, government services, or sensitive communication.

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.