Open WebUI API: Build AI Features Without Lock-in
Access ChatGPT-like capabilities programmatically. Works with any model. Runs locally. Your data stays yours.
Why Opsily for Open WebUI API Access
You're busy running a company, not a server.
No setup overhead
Skip Docker, Kubernetes, and DevOps busywork. Your Open WebUI instance is live in minutes with API endpoints ready to call. Focus on building features, not infrastructure.
GDPR-compliant by default
All Open WebUI instances run in German data centers. No US data transfers. Audit-ready logs and webhook tracking. Meets regulated industries out of the box.
Model independence
The same API code calls local Ollama, ChatGPT, Claude, Mistral, or Cohere. Switch providers without code changes. No platform lock-in, ever.
Built for teams who need reliability
How to Access the Open WebUI API
Simple, secure, and ready to integrate today.
Choose Your App
Select an app to get started.
Deploy Open WebUI
Create your instance on Opsily. Choose your plan. Add EU-compliant storage and backups automatically.
Generate API Key
Navigate to Settings > API Key in Open WebUI. Copy your JWT token. This authenticates all your API calls.
Test with cURL or SDK
Make your first request: curl -H 'Authorization: Bearer YOUR_KEY' https://your-instance.opsily.app/api/chat. Start building immediately.
Scale to production
Add rate limiting, webhook integrations, and multi-user access via Open WebUI settings. Monitor API usage in your Opsily dashboard.
What the Open WebUI API Gives You
The Open WebUI API is a REST interface to everything in the UI: chat completions, model management, document uploads, and user administration.
Core Endpoints
Chat Completions: POST /api/chat - Send a message and get a response from any configured model. Supports streaming for real-time chat interfaces.
Models: GET /api/models - List available models. Includes local Ollama instances and connected cloud providers (OpenAI, Claude, Mistral, etc.).
RAG: POST /api/documents - Upload files for semantic search and retrieval-augmented generation (RAG). Query with POST /api/search.
Users & Auth: GET /api/users - Manage team members and permissions. Every request requires a valid API key in the Authorization header.
Authentication
All endpoints use bearer token authentication: Authorization: Bearer your-jwt-key
API keys are issued per user in Open WebUI Settings. Revoke them anytime. No credit card required to test locally.
Why Developers Choose Open WebUI API
No SDK overhead. You speak HTTP. Works from Node.js, Python, Go, Rust, even bash. The official API is OpenAI-compatible, so if you've used ChatGPT's API, you already know the syntax. Switch backends (Ollama, OpenAI, Claude) by changing one line of config. Your code stays the same.
Real Python Example
import requests
api_key = 'your-jwt-token'
base_url = 'https://your-instance.opsily.app'
response = requests.post(
f'{base_url}/api/chat',
headers={'Authorization': f'Bearer {api_key}'},
json={
'model': 'mistral',
'messages': [
{'role': 'user', 'content': 'Summarize this: ...'}
]
}
)
print(response.json()['choices'][0]['message']['content'])```
Same API, Multiple Backends
Change 'model': 'mistral' to:
'model': 'gpt-4'- Uses your OpenAI API key'model': 'ollama:llama2'- Uses local Ollama'model': 'claude-3'- Uses Claude via Anthropic API
Zero code changes elsewhere. This is why teams avoid lock-in.
Apps That Work With Open WebUI API
Extend Open WebUI into your workflow.
Self-hosted chat interface for local and private LLMs
Enterprise-Grade API Security
Built for regulated industries. Audit-ready. No shortcuts.
GDPR Compliant
German data centers. Zero US data transfers. Audit logs for every API call. Meet compliance requirements on day one.
API Rate Limiting
Configurable per user or per app. Prevent abuse. Monitor usage in real time. Webhooks trigger on quota breaches.
Encryption in Transit & Rest
TLS 1.3 for all API traffic. Sensitive data encrypted at rest. Open WebUI stores no chat logs by default unless you configure it.
Webhook Integrations
Send API events to your systems. New chat, model changes, user actions. Build audit trails and compliance dashboards easily.
Frequently Asked Questions
Developers ask these. Here are the answers.
The Open WebUI API is a REST interface that lets you send chat messages, manage models, upload documents, and administer users programmatically. You make HTTP requests to endpoints like POST /api/chat, passing your API key in the Authorization header. For example, a Python script can call the API to send a message to Ollama or OpenAI without touching the web interface. Every endpoint returns JSON, making it easy to integrate with any backend language or framework.
Stop Reinventing Self-hosted AI.
Open WebUI is free. Running it isn't. Get your API-ready instance up today and build in minutes instead of weeks.
Simple, Transparent Pricing
All plans include GDPR-compliant EU hosting. No setup fees. Cancel anytime.
Loading pricing...