Overview
LexiSaaS is an AI API proxy that uses STONE (Semantic Token Optimization and Natural Encoding) to restructure your requests and reduce token costs by 50-95%.
It is a drop-in replacement for OpenAI, Anthropic, Google, and other APIs. Change the base URL, keep the rest of your code.
Quickstart
Get started in under 5 minutes.
Create Account & Get API Key
Sign up and generate an API key from your dashboard.
Change Base URL
Point your SDK at api.lexisaas.com instead of the provider URL.
# OpenAI-compatible format curl https://api.lexisaas.com/v1/chat/completions \ -H "Authorization: Bearer lx_your_key_here" \ -H "Content-Type: application/json" \ -d '{ "model": "gpt-4o", "messages": [{"role": "user", "content": "Hello!"}] }'
Send Requests
Use your existing code. STONE optimizes automatically.
Authentication
All requests require an API key in the Authorization header.
Authorization: Bearer lx_your_key_here
Use Bearer token format: Authorization: Bearer lxs_your_key
Authorization: Bearer lx_your_key:sk-your-openai-key
Keys start with lxs_ and are hashed with SHA-256. Never share your key.
Endpoints
Chat Completions
POST https://api.lexisaas.com/v1/chat/completions
OpenAI-compatible chat completions endpoint. Supports streaming.
Messages
POST https://api.lexisaas.com/v1/messages
Anthropic-compatible messages endpoint. Supports streaming.
List Models
GET https://api.lexisaas.com/v1/models
Returns all available models with pricing and provider information.
Models & Pricing
OpenAI
| Model | Input (per 1M) | Output (per 1M) |
|---|---|---|
| gpt-4o | $2.50 | $10.00 |
| gpt-4o-mini | $0.15 | $0.60 |
| gpt-4-turbo | $10.00 | $30.00 |
| o1 | $15.00 | $60.00 |
| o3 | $10.00 | $40.00 |
| o4-mini | $1.10 | $4.40 |
Anthropic
| Model | Input (per 1M) | Output (per 1M) |
|---|---|---|
| claude-3.5-sonnet | $3.00 | $15.00 |
| claude-3.5-haiku | $0.80 | $4.00 |
| claude-3-opus | $15.00 | $75.00 |
| Model | Input (per 1M) | Output (per 1M) |
|---|---|---|
| gemini-2.0-flash | $0.10 | $0.40 |
| gemini-1.5-pro | $1.25 | $5.00 |
xAI / DeepSeek / Meta
| Model | Input (per 1M) | Output (per 1M) |
|---|---|---|
| grok-3 | $3.00 | $15.00 |
| grok-3-mini | $0.30 | $0.50 |
| deepseek-chat | $0.14 | $0.28 |
| deepseek-reasoner | $0.55 | $2.19 |
| llama-4 | $0.20 | $0.60 |
Response Headers
Every response includes detailed headers with cost and savings information.
| Header | Description |
|---|---|
X-Lexi-Request-Id | Unique request ID |
X-Lexi-Model | AI model used |
X-Lexi-Provider | Provider (openai, anthropic, google) |
X-Lexi-Tokens-Input | Input tokens after STONE optimization |
X-Lexi-Tokens-Output | Output tokens |
X-Lexi-Tokens-Saved | Tokens saved by STONE |
X-Lexi-Cost | Provider cost (USD) |
X-Lexi-Savings | Money saved (USD) |
X-Lexi-Balance | Remaining balance (USD) |
X-Lexi-TSP-Confidence | Response time (ms) |
Billing
LexiSaaS uses a prepaid credit system. Purchase credits via the dashboard.
The Lexi fee is 40% of the savings STONE generates. No savings = no fee.
Credits never expire. You can check your balance and usage in the dashboard at any time.