Signal House
Tier 2 CPaaS for 10DLC SMS, MMS, and group messaging
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
- Live human support is included on every plan rather than sold as a premium tier, with a dedicated Slack channel above 500k segments/month
- Published A2P approval targets (72 hours, or 48 at volume) give a concrete commitment on the step that usually delays SMS launches
Cons
- Messaging only — voice, RCS, short code, alphanumeric sender IDs and Apple Business Messaging are all listed as coming soon rather than available, despite voice appearing in the top-line marketing
- The headline savings claims (up to 80% vs Twilio, 90% vs Plivo, 91% vs Soprano) are the vendor's own comparisons with no stated methodology or basket of usage
- Quoted rates exclude carrier pass-through fees, which on AT&T and T-Mobile can add $0.0035-$0.0045 per SMS segment — roughly doubling the effective floor price at low volume
- Small and young: founded 2022 with a headcount in the low double digits, so it carries more continuity risk than an incumbent aggregator
- US-focused — the published rate cards cover US local and toll-free numbers only, with no international pricing shown
- The best rates require 10m+ segments a month and the site states all rates are negotiable, so the published card is a starting point rather than a firm price at scale
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
Local and toll-free numbers with volume-tiered monthly pricing, plus single and bulk porting of existing 10DLC and toll-free numbers.
Number lookup
Carrier and line-type lookup billed at $0.005 per query across all sender types.
Analytics and real-time usage
Delivery and engagement analytics with real-time usage tracking intended to make spend visible before the invoice arrives.
Live human support on every plan
Support is included at no cost on pay-as-you-go, with a dedicated Slack channel for accounts above 500k segments per month.
Pricing
- 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)
- Number lookup $0.005 per query
- Free live support
- A2P approval in 72 hours or less
- Local 10DLC SMS $0.0050 per segment at 500k-1m
- MMS drops to $0.0170 per segment
- Local numbers $0.50 each at 500-1,000 numbers
- Free support plus a dedicated Slack channel
- A2P approval in 48 hours or less
- Best published rate: $0.0030 per SMS segment
- Tiered steps at 1m ($0.0045), 2m ($0.0040) and 5m ($0.0035)
- Local numbers $0.25 each at 1,000+ numbers
- All rates negotiable based on volume and agreement terms
- Toll-free SMS from $0.0079 per outbound segment
- Drops to $0.0050 at 10m+ segments per month
- Flat $1.00 per number/month with no volume tiers
- Longer carrier verification timeline than 10DLC
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.
Group messaging for sales and support
Sales and success teams run multi-party SMS threads so several people stay in one conversation with a customer in real time.
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