Signal House

Overview

Signal House is a US messaging aggregator and CPaaS that sells 10DLC, toll-free and short code SMS and MMS, group messaging and voice in North America. It describes itself as a Tier 2 aggregator with at most one hop to the carriers and handles A2P brand and campaign registration. Its API also includes an AI agent service that answers over SMS, webchat and voice.

Key features

• SMS, MMS and group messages through one REST API, with 10DLC brand and campaign registration
• AI agents with tools, knowledge bases, per-channel settings and a review mode where a person approves each reply
• Remote MCP server with OAuth that can send messages, buy numbers and register campaigns
• SDKs for JavaScript, Python, Go, PHP, Ruby, Rust and .NET
• HMAC-SHA256 signed webhooks with secret rotation, and idempotency keys on writes
• Programmable voice, WebRTC softphones and SIP trunks
• Number porting, number lookup and number health scores
• GoHighLevel, HubSpot and Shopify apps, plus Make.com

Pricing

Pay as you go with no platform fee: 10DLC SMS costs $0.0065 per segment, falling to $0.0030 above 10 million a month; toll-free SMS starts at $0.0079 and MMS at $0.02. Local and toll-free numbers cost $1.00 a month. Carrier and 10DLC registration fees are passed through at cost. New accounts get $25 in credit.

How it compares to Linq

Signal House does not offer iMessage, and it lists RCS, WhatsApp and Apple Business Messaging as coming soon. Linq sends iMessage, RCS and SMS from one API at a flat monthly price from $260 with no per-message fees; Signal House bills per segment. Signal House places calls through its voice API, while Linq's docs say its API does not place or answer calls. Both run an MCP server and sign webhooks with HMAC-SHA256.

Best for

US teams that want low-cost 10DLC SMS and MMS with registration help, including AI agents that text from a local number.

Sources

• signalhouse.io/llms.txt
• signalhouse.io
• signalhouse.io/pricing.md
• signalhouse.io/products/coming-soon
• signalhouse.io/products/api
• signalhouse.io/products/sms
• signalhouse.io/signal-house-faq
• app2.signalhouse.io/docs
• app2.signalhouse.io/docs/mcp
• app2.signalhouse.io/docs/agents
• app2.signalhouse.io/docs/messages
• app2.signalhouse.io/docs/webhooks
• app2.signalhouse.io/docs/webhook-signing
• app2.signalhouse.io/docs/numbers
• app2.signalhouse.io/docs/voice
• signalhouse.io/go-high-level-messaging
• signalhouse.io/hubspot-messaging
• npmjs.com/package/@signalhousellc/sdk
• github.com/bonzo-signalhouse/SignalHouseSDK-PY