Signal House
Tier 2 CPaaS for 10DLC SMS, MMS, and group messaging
Founded
2022
Starting Price
$0.0065
Category
Communication
Last updated August 18, 2026
About Signal House
Signal House is a communications platform (CPaaS) that provides SMS, MMS, and group messaging through APIs and an in-platform gateway, positioned as a lower-cost alternative to Twilio and other aggregators. It operates as a Tier 2 aggregator, meaning traffic passes through at most one intermediary before reaching carriers, which the company credits for its delivery speed and support turnaround. Pricing is usage-based with published per-segment rates, volume discounts, and carrier fees passed through at cost.
Pros & Cons
Pros
- Publishes full per-segment rate cards, number pricing, and carrier pass-through fees on a public page, which is unusual in a category where most vendors gate pricing behind sales
- Carrier fees and A2P registration fees are passed through at cost with the amounts itemised, so the vendor margin sits only in the messaging rate
- No monthly platform fee or minimum spend — cost scales purely with usage, which suits low-volume senders that per-seat CPaaS pricing punishes
- Tier 2 aggregation means one intermediary at most between the platform and the carriers, which is a genuine architectural difference from resellers sitting three or four layers deep
Key Features
10DLC SMS messaging
Send and receive A2P SMS over 10-digit long codes, with toll-free and hosted SMS also supported and short code listed as coming soon.
MMS messaging
Deliver images, video, GIFs and other multimedia as part of A2P campaigns, priced separately from SMS.
Group SMS
Group messaging threads so multiple participants stay in one real-time conversation rather than parallel one-to-one threads.
Messaging APIs and SDKs
REST APIs and SDKs for embedding messaging into an existing application or stack, with documentation aimed at developers who want minimal abstraction.
Tier 2 aggregation
Direct upstream connections mean at most one layer sits between the platform and the carriers, versus the three or four layers the company attributes to other CPaaS providers.
10DLC campaign registration
Handles A2P brand and campaign registration with published approval targets of 72 hours on pay-as-you-go and 48 hours above 500k segments per month.
Number provisioning and porting
Pricing
Pay as you go
$0.0065/SMS segment
- No monthly platform fee or minimum
- Local 10DLC SMS $0.0065 per outbound segment
- MMS $0.0200 per outbound segment
- Local numbers $1.00 per number/month
- Toll-free numbers $1.00 per number/month (flat)
Best For
Replacing Twilio for high-volume A2P SMS
Teams already sending 10DLC traffic port their numbers and campaigns to cut per-segment cost, which is the vendor's primary pitch.
Embedding SMS in a SaaS product
Product teams integrate the messaging API so their own application handles conversation logic while Signal House handles carrier delivery.
Two-factor authentication and transactional alerts
Security-critical one-time passcodes and system notifications where delivery speed and reliability matter more than campaign features.
Platforms reselling messaging to their own customers
CRMs and vertical SaaS platforms use the aggregator underneath their own branded messaging feature, with 10DLC registration handled per end customer.
