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 (60) CA DE FR GB NL PL SE US

Public Aggregated Pools (60 Numbers)

On-Demand Mirror

CA Pool smsdock

+16727241282

Country: CA On-demand mirror

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CA Pool smsdock

+14382022633

Country: CA On-demand mirror

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CA Pool smsdock

+14166853947

Country: CA On-demand mirror

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CA Pool smsdock

+14509361284

Country: CA On-demand mirror

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CA Pool smsdock

+14379930595

Country: CA On-demand mirror

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CA Pool smsdock

+18259701202

Country: CA On-demand mirror

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CA Pool smsdock

+14384016168

Country: CA On-demand mirror

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CA Pool smsdock

+18255716949

Country: CA On-demand mirror

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CA Pool smsdock

+19028844179

Country: CA On-demand mirror

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CA Pool smsdock

+16476106386

Country: CA On-demand mirror

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CA Pool smsdock

+15144442621

Country: CA On-demand mirror

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CA Pool smsdock

+16131829319

Country: CA On-demand mirror

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CA Pool smsdock

+14378405056

Country: CA On-demand mirror

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CA Pool smsdock

+16476594632

Country: CA On-demand mirror

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CA Pool smsdock

+14166309345

Country: CA On-demand mirror

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CA Pool smsdock

+18255352585

Country: CA On-demand mirror

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CA Pool smsdock

+17809346471

Country: CA On-demand mirror

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CA Pool smsdock

+16723537397

Country: CA On-demand mirror

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CA Pool smsdock

+17808931924

Country: CA On-demand mirror

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CA Pool smsdock

+16049574989

Country: CA On-demand mirror

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CA Pool smsdock

+16134765301

Country: CA On-demand mirror

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CA Pool smsdock

+18253777569

Country: CA On-demand mirror

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CA Pool smsdock

+16047058655

Country: CA On-demand mirror

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CA Pool smsdock

+16727565937

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322449

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323031

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323082

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322457

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323078

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322667

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322643

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322610

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322602

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322594

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323073

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322755

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323107

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322522

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322759

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322530

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322464

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322433

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322731

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322703

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322763

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322707

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322735

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322695

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322526

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322566

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323045

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323111

Country: CA On-demand mirror

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CA Pool receivesms_co

+190323069

Country: CA On-demand mirror

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CA Pool receivesms_co

+190322502

Country: CA On-demand mirror

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CA Pool instantnum

+17822020179

Country: CA On-demand mirror

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CA Pool instantnum

+17822020308

Country: CA On-demand mirror

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CA Pool instantnum

+12262701927

Country: CA On-demand mirror

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CA Pool instantnum

+17822020272

Country: CA On-demand mirror

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CA Pool instantnum

+15067126083

Country: CA On-demand mirror

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CA Pool instantnum

+17822015065

Country: CA On-demand mirror

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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.