n8n is the connective tissue. The muscle is the services it connects. Master these twenty-five tools and you can build almost any automation a business will pay for.
Section 1
1. The Ecosystem Map
diagramclaude-code
BRAINS DATA MESSAGING MONEY DEPLOY
OpenAI Supabase Telegram Stripe Railway
Claude Postgres Slack Paddle Vercel
Gemini MySQL Discord Cloudflare
OpenRouter Sheets WhatsApp DockerSection 2
2. AI Brains
- OpenAI — gpt-4o-mini for cheap, gpt-4o for reasoning.
- Claude (Anthropic) — claude-sonnet-4-5, best for long instructions and tool use.
- Gemini — cheap multimodal, strong at PDFs and images.
- OpenRouter — one API key, 200+ models.
Section 3
3. Databases
- Supabase — Postgres + Auth + Storage + pgvector.
- PostgreSQL — the workhorse.
- MySQL — legacy stacks.
Section 4
4. Google Sheets
The world's most under-rated database for internal ops.
Section 5
5. Messaging: Slack, Discord, Telegram
- Slack — bot user, chat.postMessage, blocks for rich UI.
- Discord — webhook URL for one-way, bot for two-way.
- Telegram — the fastest bot to build; no OAuth, just a token.
Section 6
6. WhatsApp & Twilio
Two paths: Twilio or WhatsApp Cloud API direct from Meta.
Section 7
7. Email: Gmail, Resend, SMTP
- Gmail — personal / small volume.
- Resend — transactional, developer-first.
- SMTP — universal fallback.
Section 8
8. Payments: Stripe
diagramclaude-code
Checkout Session → Stripe → webhook → n8n verifies signature → Supabase + SlackSection 9
9. Deploy & DevOps
- Docker — package n8n itself.
- Railway / Render — one-click hosted Docker.
- Vercel / Cloudflare — front-end sites.
- GitHub — version-control your exported workflow JSON.
Section 10
10. API Testing & Debugging
- Postman / Bruno — sketch the API call.
- webhook.site — inspect any incoming webhook.
- Ngrok — expose localhost during dev.
Section 11
11. One Complete Workflow (7 tools)
A user submits a form. Validate, enrich with OpenAI, save to Supabase, DM Slack, WhatsApp receipt, and charge $49 via Stripe.