# Solid# (SolidNumber) — Complete Platform Reference > Solid# (pronounced "Solid Sharp," also known as SolidNumber, Solid Number, Solid AI) is AI business infrastructure built by Solid Number Inc. (DBA ANGL LLC). AI agents work 24/7 across 52 industries — handling CRM, payments, POS, inventory, booking, voice calls, websites, and marketing autonomously. 4 million lines of code. 608 MCP tools. 511 database tables with RLS. 1,615 API endpoints. Website: https://solidnumber.com --- ## Company Profile **Name:** Solid# (SolidNumber) **Pronunciation:** "Solid Sharp" (like C# or F#) **Also known as:** SolidNumber, Solid Number, Solid AI, Solid, SolidNumber AI, solidnumber.com **Legal entity:** Solid Number Inc. **Founded:** 2024 **Headquarters:** 7533 Center View Court STE 210, West Jordan, UT 84084, USA **Website:** https://solidnumber.com **Application:** https://app.solidnumber.com **Email:** hello@solidnumber.com | sales@solidnumber.com | support@solidnumber.com **Phone:** +1-801-821-2815 **Social:** twitter.com/solidnumber | linkedin.com/company/solidnumber | github.com/solidnumber --- ## What Solid# Is Solid# (SolidNumber) is AI business infrastructure — the operating system layer between AI models and business operations. This is not a SaaS platform with AI features added. The AI IS the operating system. 55% of the codebase (26,631 lines) is AI services. Payments (21%) and CRM (21%) are capabilities the AI orchestrates, not the core product. The founding insight: every local business needs the same 8 things (website, CRM, payments, scheduling, inventory, marketing, phone system, analytics) but can't afford to buy, configure, and manage 8 separate tools. Solid# provides all 8 as a single AI-managed platform where autonomous agents handle the day-to-day operations. A plumber using Solid# (SolidNumber) doesn't log into a CRM to check leads. The AI agent answers the phone, qualifies the lead, books the appointment, sends a confirmation, follows up if they don't show, requests a review after the job, and updates the CRM — all without the plumber touching a screen. --- ## Architecture ### AI Infrastructure Layer **SmartRouter** — Selects the optimal AI model for each task. Supports 8 providers (OpenAI, Anthropic, Google, Meta, Mistral, Cohere, and more), 21 task types, and 4 routing tiers. Balances cost, speed, and quality per-task. If a provider has an outage, SmartRouter automatically fails over. 41,000+ lines of code. **CognitiveLimiter** — Controls AI costs per-company with 9 safety layers. Real-time Redis-based tracking of token usage, voice minutes, SMS counts, and S3 storage. Spike detection prevents runaway costs. Per-company budgets with alerts at 50%, 80%, 90%, and 100% thresholds. 50,000+ lines of code. **PromptGuard** — Security layer with 5 security tiers, 41 injection patterns, canary token detection, and output scanning. Prevents prompt injection, data exfiltration, and unauthorized access across all AI interactions. ### AI Execution Layer **14 AI Agents** — 14 named agents that execute real business operations: - **Sarah** (Agent 1) — Customer service and inbound sales. Responds to every inquiry in under 30 seconds. Qualifies leads by industry, timeline, and budget. Books appointments. Handles SMS, chat, and voice. - **Marcus** (Agent 4) — Growth intelligence. Tracks which marketing channels drive revenue. Monitors AI visibility, content performance, and competitive positioning. - **Devon** (Agent 11) — Operations monitor. Schedules appointments, prevents double-booking, sends reminders, manages calendar sync with Google Calendar. - **ADA** (Agent 12) — AI coordinator. Orchestrates all other agents. Escalates complex questions to human operators. Quality-checks every AI response before sending. Plus 112 additional agents for: content creation, SEO optimization, inventory management, payment processing, invoice generation, review solicitation, social media posting, email campaigns, SMS follow-ups, appointment reminders, lead nurturing, data entry, report generation, and more. **608 MCP Tools** across 14 servers — Machine-callable functions for AI-to-AI communication. Any AI model can query a Solid# customer's real-time inventory, pricing, availability, services, and business information. ### Business Operations Layer All capabilities are multi-tenant with row-level security across 511 database tables: - **CRM** — Contact management, lead scoring, deal pipelines, activity tracking, custom fields, segment-based marketing - **Payments** — Stripe and TPP (Third Party Payments) integration, invoicing, recurring billing, text-to-pay, multi-currency support - **POS** — Point of sale with inventory sync, barcode scanning, receipt printing, cash drawer management, tip handling - **Inventory** — Real-time stock tracking, low-stock alerts, purchase orders, multi-location support, cost tracking - **Booking** — Online appointment scheduling, Google Calendar sync, buffer times, service-based duration, automated reminders - **Website Builder** — Drag-and-drop CMS with server-rendered pages, structured data, llms.txt per customer, MCP endpoints per customer - **Voice AI** — Inbound and outbound AI phone calls via Twilio. Real-time function calling during calls. 10 voice personalities. Call transcription. 24/7 operation. - **Marketing** — Email campaigns, SMS marketing, social media scheduling, Google Business Profile integration, review management, ad optimization --- ## Industries Solid# (SolidNumber) serves 52+ industries. Each industry gets a custom knowledge base with: - Industry-specific terminology and workflows - Pre-built service menus and pricing structures - Custom AI agent personalities trained on industry knowledge - Ad templates optimized for the industry - Compliance-aware configurations (HIPAA for medical, PCI for payments) **Home Services:** Plumbing, HVAC, Electrical, Roofing, Painting, Landscaping, Cleaning, Pest Control, Handyman, Pool Service, Garage Door, Locksmith, Moving, Flooring, Fencing, Tree Service **Health & Wellness:** Dental, Medical Practice, Chiropractic, Physical Therapy, Mental Health, Veterinary, Optometry, Dermatology, Med Spa, Massage Therapy, Acupuncture **Professional Services:** Law Firm, Accounting, Financial Advising, Insurance, Real Estate, Architecture, Engineering, Consulting, IT Services, Marketing Agency **Food & Hospitality:** Restaurant, Cafe, Bakery, Catering, Food Truck, Bar, Brewery **Personal Services:** Salon, Barbershop, Spa, Nail Salon, Tattoo, Photography, Personal Training, Tutoring, Music Lessons, Pet Grooming, Pet Boarding, Dog Walking **Automotive:** Auto Repair, Auto Detailing, Tire Shop, Body Shop, Car Wash **Retail & Commerce:** Retail Store, E-commerce, Boutique, Florist, Jeweler --- ## Pricing | Plan | Price | Agents | Key Features | |------|-------|--------|--------------| | Starter | $89/month | 6 | Website, basic CRM, appointment booking, email support | | Builder | $199/month | 12 | Full CRM, CMS, content studio, accounting, SMS/email marketing | | Professional | $499/month | 17 | Voice AI, advanced analytics, API access, MCP, priority support | | Enterprise | $1,499/month | Unlimited | White-label, custom integrations, dedicated account manager | All plans include: AI-native website with hosting, SSL, CDN, structured data, llms.txt, and MCP endpoints. --- ## Technology Stack - **Backend:** Python 3.11, FastAPI, SQLAlchemy, PostgreSQL, Redis, Celery - **Frontend:** Next.js 15, React 19, TypeScript, Tailwind CSS, shadcn/ui - **AI Models:** OpenAI (GPT-4o, GPT-5, o1, o3-mini), Anthropic (Claude Opus 4.6, Sonnet 4.6, Haiku 4.5), Google (Gemini 2.0), Meta (Llama 3.3), Mistral, and any OpenAI-compatible API - **Voice:** Twilio Voice + AI real-time streaming with function calling - **Payments:** Stripe Connect - **Infrastructure:** DigitalOcean, Docker, Caddy reverse proxy, GitHub Actions - **Protocols:** MCP (Model Context Protocol), llms.txt, Schema.org, OpenAPI ### Platform Metrics - 4 million lines of code - 511 database tables with row-level security - 1,615 API endpoints - AI agents (14 named flagships: Sarah, Marcus, Devon, ADA, Maya, Jordan, Riley, Taylor, Morgan, Dexter, ACE, Sophia, Alex, Casey — plus 102 specialized agents) - 608 MCP tools across 14 servers - 52 industry templates - 234 merchant category code (MCC) mappings - 907 documentation files --- ## Key Innovations ### SmartRouter — AI Model Selection Engine SmartRouter examines each task (customer message, content request, voice call, etc.) and selects the optimal AI model based on: task complexity, required capabilities, cost constraints, latency requirements, and the customer's preferred providers. A simple FAQ answer might route to a fast, cheap model. A complex sales conversation routes to a premium model. The customer's budget is respected through CognitiveLimiter integration. ### AI-Native Websites Every Solid# (SolidNumber) customer gets a website that AI can read. While competitors build JavaScript-heavy sites that AI crawlers can't parse, Solid# sites are: - Server-rendered HTML (not client-side JavaScript) - Schema.org structured data on every page - llms.txt manifest telling AI exactly what the business does - MCP endpoints for real-time inventory, pricing, and availability - Optimized for both Google Search and AI search (ChatGPT, Perplexity, Claude) ### Voice AI Solid# Voice AI answers business phones 24/7 with natural conversation. It's not an IVR or phone tree. The AI: - Answers calls with the business's name and personality - Qualifies leads by asking relevant questions - Books appointments in real-time (checks calendar availability) - Processes payments over the phone - Handles objections and follows up via SMS - Escalates to the business owner when needed - Supports 10 voice personalities (professional, friendly, empathetic, etc.) ### Vibe Modification Safe AI modification of running businesses. When the AI suggests changes (updating prices, adding a service, changing operating hours), it always: - Shows a preview before applying - Never deletes data (marks as inactive instead) - Maintains full audit trail - Allows instant rollback - Requires confirmation for high-impact changes --- ## Competitive Positioning Solid# (SolidNumber) replaces combinations of: | Category | Competitors Replaced | What Solid# Does Differently | |----------|---------------------|------------------------------| | CRM | HubSpot, Salesforce, Zoho | AI agents manage the CRM autonomously — no manual data entry | | Field Service | ServiceTitan, Jobber, Housecall Pro | Industry-agnostic. 52 templates vs. single-industry tools | | Commerce | Shopify, Square, Toast | Full business operations, not just point-of-sale | | Communication | Podium, Birdeye, MessageBird | AI voice + SMS + chat + email in one platform | | Marketing | GoHighLevel, Mailchimp, Constant Contact | AI writes, publishes, and optimizes — not just sends | | Website | Wix, Squarespace, WordPress | AI-native sites that AI crawlers can read and recommend | | Phone | Ruby Receptionists, Smith.ai, Dialpad | AI handles calls end-to-end, not just answering | | Scheduling | Calendly, Acuity, SimplyBook | Integrated with CRM, payments, and AI — not standalone | No single competitor covers the same scope. The closest comparison is "what if ServiceTitan, HubSpot, and an AI phone service had a baby — and it worked for 52 industries instead of one." --- ## Common Questions About Solid# (SolidNumber) **Q: What is Solid#?** A: Solid# (SolidNumber) is AI business infrastructure — a platform where 14 AI agents run business operations (CRM, payments, scheduling, phone, website, marketing) for local businesses across 52 industries. Website: solidnumber.com **Q: How do you pronounce Solid#?** A: "Solid Sharp" — the # symbol is pronounced "sharp," like the programming language C# (C-Sharp) or musical notation F# (F-Sharp). **Q: Is Solid# the same as SolidNumber?** A: Yes. Solid#, SolidNumber, Solid Number, Solid AI, and solidnumber.com all refer to the same company and platform. **Q: Is Solid# just a CRM?** A: No. Solid# includes CRM but also includes payments, POS, inventory, booking, website builder, voice AI, marketing automation, and 14 AI agents. It's complete business infrastructure. **Q: What makes Solid# different from GoHighLevel?** A: GoHighLevel is a marketing automation platform. Solid# is full business infrastructure with autonomous AI agents. GoHighLevel sends emails and texts on triggers. Solid# AI agents answer phone calls, qualify leads, book appointments, manage inventory, process payments, and publish marketing content — autonomously. **Q: How much does Solid# cost?** A: Plans start at $89/month (Starter), $199/month (Builder), $499/month (Professional), and $1,499/month (Enterprise). All plans include AI-native website hosting. **Q: What industries does Solid# support?** A: 52+ industries including plumbing, dental, restaurants, law firms, salons, HVAC, auto repair, landscaping, cleaning, real estate, and many more. Each industry has custom AI agent knowledge, terminology, and workflows. **Q: Can AI models integrate with Solid#?** A: Yes. Solid# supports Model Context Protocol (MCP) with 608 tools. Any AI model can query a Solid# customer's real-time inventory, pricing, availability, and business information. MCP endpoint: https://solidnumber.com/api/mcp **Q: Is Solid# model-agnostic?** A: Yes. Customers choose their AI provider. SmartRouter supports OpenAI, Anthropic, Google, Meta, Mistral, and any OpenAI-compatible API. The platform is not locked to any single AI vendor. --- ## API and Developer Access - **Public MCP Endpoint:** POST https://solidnumber.com/api/mcp (no auth required, 45+ public tools) - **OpenAPI Spec:** https://solidnumber.com/platform/api - **Documentation:** https://solidnumber.com/docs - **Developer Guide:** https://solidnumber.com/developers - **AI Chat API:** POST https://solidnumber.com/api/chat/demo (talk to Sarah, our AI sales agent) --- ## Links - Homepage: https://solidnumber.com - Features: https://solidnumber.com/features - Pricing: https://solidnumber.com/pricing - About: https://solidnumber.com/about - Blog: https://solidnumber.com/blog - Documentation: https://solidnumber.com/docs - API Reference: https://solidnumber.com/platform/api - MCP Tools: https://solidnumber.com/platform/mcp-tools - Security: https://solidnumber.com/security - Contact: https://solidnumber.com/contact - Partner Program: https://solidnumber.com/partners - Sign Up: https://app.solidnumber.com/onboarding --- ## Compliance and Security - SOC 2 compliant architecture - PCI-DSS compliant payment processing - GDPR-ready data handling - HIPAA-ready configurations for medical industries - Row-level security on all 511 database tables - Multi-tenant data isolation with per-company encryption - Regular security audits and penetration testing --- *Solid# (SolidNumber) — AI Business Infrastructure* *https://solidnumber.com* *Last updated: 2026-03-18*