Deploy and Host n8n + Evolution API — WhatsApp Automation Stack on Railway

The complete self-hosted stack for WhatsApp workflow automation: Evolution API as the WhatsApp gateway, n8n as the visual workflow engine, and PostgreSQL as the persistent data layer — all pre-wired on Railway's private network with one-click deployment.

Connect a WhatsApp account via QR code, design automation flows in n8n, and handle real-time WhatsApp events via webhook — no Meta Business API approval, no per-message billing, fully self-hosted on Railway for ~$10–15/month flat.

What This Template Deploys

Service	Purpose
n8n	Visual workflow automation engine — drag-and-drop workflow builder, 500+ integrations, AI nodes, and webhook trigger handling on port `5678`
Evolution API	WhatsApp REST gateway — QR-code account connection, message sending/receiving, instance management, and webhook delivery to n8n on port `8080`
PostgreSQL 16	Shared persistent database — stores n8n workflows, credentials, execution history, and Evolution API session state

All three services connect over Railway's private internal network. Credentials are injected automatically via reference variables — no manual connection string setup required.

About Hosting n8n + Evolution API

Running a production WhatsApp automation stack requires three coordinated services: Evolution API for the WhatsApp connection, n8n for workflow logic, and a PostgreSQL database shared between them — all behind HTTPS with proper webhook routing between services.

Without a managed host, you're configuring Docker Compose, inter-service networking, SSL, and environment variable coordination across three containers manually. Railway provisions all of it automatically — private networking, shared credentials, and HTTPS endpoints for both n8n and Evolution API.

Typical cost: ~$10–15/month on Railway's Hobby plan for the three-service stack. Compare to WATI (managed WhatsApp + automation) at $49/month, or Twilio WhatsApp at $0.005–$0.085 per message combined with n8n Cloud at $20/month with execution caps. This stack gives you unlimited WhatsApp messaging and unlimited n8n executions at flat compute pricing.

Deploy in Under 5 Minutes

Click Deploy on Railway — all three services build automatically (~4–5 minutes)
Set AUTHENTICATION_API_KEY, SERVER_URL (Evolution API domain), and WEBHOOK_URL (n8n domain) in the Variables tab
Mount a Railway volume at /evolution/instances on the Evolution API service
Open your n8n URL — create your admin account and install the n8n-nodes-evolution-api community node from Settings → Community Nodes
Open [evolution-domain]/manager, create a WhatsApp instance, and scan the QR code
Build your first WhatsApp automation workflow in n8n

No SSH. No Docker Compose. No manual networking.

Common Use Cases

Self-hosted WhatsApp automation without Meta Business API — connect any WhatsApp account via QR code and trigger n8n workflows from incoming messages without Meta Business Manager verification, API application, or per-message billing
WhatsApp customer support automation — triage messages, respond to FAQs, create CRM records, and escalate to agents via Slack or Chatwoot — all triggered by Evolution API webhooks
Self-hosted alternative to WATI and Twilio WhatsApp — replace $49–$99/month managed platforms with a flat ~$10–15/month stack; unlimited messages, no per-message fees
AI-powered WhatsApp chatbot — chain Evolution API webhook triggers into n8n AI nodes (Claude, GPT-4o, Gemini) to build intelligent WhatsApp bots that understand context and respond conversationally
WhatsApp lead capture and CRM automation — capture inbound leads, enrich via n8n, and push to HubSpot, Airtable, Notion, or any CRM using n8n's 500+ integrations
Multi-account WhatsApp notifications — manage multiple Evolution API instances; trigger personalised order updates, payment confirmations, and reminders at scale with no per-message billing

Configuration

Variable	Required	Description
`AUTHENTICATION_API_KEY`	✅ Required	Evolution API master key — authenticates all REST calls to the WhatsApp gateway
`SERVER_URL`	✅ Required	Your Railway Evolution API public URL — required for QR code generation and webhook delivery
`DATABASE_URL`	✅ Auto-injected	PostgreSQL connection string — shared between n8n and Evolution API via Railway reference variable
`WEBHOOK_URL`	✅ Required	Your Railway n8n public URL — Evolution API sends message events here to trigger workflows
`N8N_ENCRYPTION_KEY`	✅ Required	32-char random string — encrypts all n8n credentials in PostgreSQL
`N8N_BASIC_AUTH_ACTIVE`	Recommended	Set to `true` — protects the n8n editor from public access
`N8N_BASIC_AUTH_USER`	Recommended	Username for n8n basic auth
`N8N_BASIC_AUTH_PASSWORD`	Recommended	Password for n8n basic auth — use a strong value
`DATABASE_PROVIDER`	Pre-set	`postgresql` — connects Evolution API to the shared Railway PostgreSQL
`CACHE_REDIS_URI`	Optional	Add a Railway Redis service and set this for Evolution API session caching at scale

Volume required: Mount a Railway volume at /evolution/instances on the Evolution API service. Without it, WhatsApp authentication is lost on every redeploy and users must re-scan the QR code each time.

n8n + Evolution API vs. Managed WhatsApp Automation Platforms

	This Stack (Railway)	WATI	Twilio + n8n Cloud	MessageBird
Monthly cost	~$10–15 flat	$49/month	$20+ (n8n) + per msg	$25+ per msg
Per-message fees	✅ None	❌ Yes	❌ Twilio charges per msg	❌ Yes
n8n execution caps	✅ Unlimited	N/A	❌ 10,000/month	N/A
Meta Business approval	✅ Not required	✅ Required	✅ Required	✅ Required
Data ownership	✅ Your infrastructure	❌ WATI servers	❌ Split across vendors	❌ MessageBird servers
Multi-account WhatsApp	✅ Multiple instances	❌ One number/plan	❌ One number	❌ One number
Self-hostable	✅ Yes	❌ No	❌ No	❌ No
AI/LLM workflow nodes	✅ Native n8n AI nodes	❌ No	⚠️ n8n Cloud only	❌ No

Dependencies for n8n + Evolution API Hosting

Railway account — Hobby plan (~$10–15/month) covers all three services
A WhatsApp account (personal or business) for QR code connection

Deployment Dependencies

Implementation Details

Both n8n and Evolution API share a PostgreSQL 16 instance over Railway's private network. n8n stores workflows, credentials, and execution history; Evolution API stores WhatsApp instance metadata. Evolution API delivers webhook events (messages, QR, status) to n8n's WEBHOOK_URL in real time — use a Webhook trigger node in n8n to receive them. Install n8n-nodes-evolution-api from n8n Settings → Community Nodes for native send/receive actions. Mount a volume at /evolution/instances on Evolution API — sessions are lost without it.

Frequently Asked Questions

Do I need Meta Business API approval to use this stack? No. Evolution API connects via Baileys using a standard personal or business WhatsApp account — QR scan only. No Meta Business Manager, business verification, or WhatsApp API application required. Note: using unofficial WhatsApp integrations carries account ban risk — avoid bulk unsolicited messages and implement rate limiting.

How do I connect n8n to Evolution API for WhatsApp triggers? Set WEBHOOK_URL to your n8n Railway domain. Create a Webhook trigger node in n8n. In the Evolution API Manager, set each instance webhook to your n8n webhook path. Install n8n-nodes-evolution-api from n8n Settings → Community Nodes for pre-built action nodes.

How much does this stack cost vs WATI or Twilio? This stack runs at ~$10–15/month on Railway's Hobby plan — flat, with unlimited WhatsApp messages and unlimited n8n workflow executions. WATI starts at $49/month with per-message charges above plan limits. Twilio WhatsApp charges $0.005–$0.085 per message on top of n8n Cloud's $20/month with 10,000 execution caps.

Do I lose my WhatsApp sessions and n8n workflows on redeploy? n8n workflows and credentials are stored in PostgreSQL — they survive all redeploys. WhatsApp sessions persist only if the /evolution/instances volume is mounted on the Evolution API service. With the volume in place, instances reconnect automatically after restarts.

Can I run multiple WhatsApp accounts? Yes. Evolution API supports multiple instances per deployment, each with its own QR-connected WhatsApp account. Create and manage instances via the Manager dashboard. n8n routes workflows by instance ID.

Can I add AI to my WhatsApp workflows? Yes. n8n has native AI nodes for Claude, GPT-4o, Gemini, and LangChain. Connect an Evolution API webhook trigger to an AI node to build a WhatsApp chatbot with natural language responses.

Why Deploy n8n + Evolution API on Railway?

Railway is a singular platform to deploy your infrastructure stack. Railway will host your infrastructure so you don't have to deal with configuration, while allowing you to vertically and horizontally scale it.

By deploying this stack on Railway, you get a complete WhatsApp automation platform — Evolution API for messaging, n8n for workflow logic, PostgreSQL for persistence — at ~$10–15/month flat with no per-message fees, no execution caps, and full data ownership.