API Documentation

OpenAI-compatible and Anthropic-compatible API endpoints. Drop in your API key and start making requests — zero config changes needed.

11+

AI Models

Including Claude, DeepSeek, Qwen

API Formats

OpenAI & Anthropic compatible

SSE

Streaming

Real-time token streaming

Quick Start

Get up and running in under a minute.

Create an account

Get your API key

Find your key in the Dashboard under API Keys.

Go to Dashboard

Make your first request

Use the example below to send your first API call.

curl -X POST https://api.unlimitedclaude.com/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "model": "claude-sonnet-4.6",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Authentication

All API requests require an API key passed via the x-api-key header. You can find your key in the Dashboard.

bash

curl https://api.unlimitedclaude.com/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{"model": "claude-sonnet-4.6", "messages": [...]}'

You must verify your email before making API requests. An OTP is sent during signup — verify it to activate your key.

Base URL

All endpoints are relative to this base URL.

https://api.unlimitedclaude.com/api/v1

For example, chat completions live at /api/v1/chat/completions.

Chat Completions

POST/api/v1/chat/completions—OpenAI-compatible endpoint

Works with any SDK or tool that supports the OpenAI chat format.

Request Body

Parameter	Type	Required	Description
model	string	Required	Model ID to use
messages	array	Required	Array of message objects with role and content
stream	boolean	Optional	Enable SSE streaming (default: false)
max_tokens	integer	Optional	Maximum tokens to generate
temperature	number	Optional	Sampling temperature (0-1)

Example

curl -X POST https://api.unlimitedclaude.com/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "model": "claude-sonnet-4.6",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "What is the capital of France?"}
    ],
    "max_tokens": 256
  }'

Response

json

{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "model": "claude-sonnet-4.6",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "The capital of France is Paris."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 25,
    "completion_tokens": 8,
    "total_tokens": 33
  }
}

Messages API

POST/api/v1/messages—Anthropic-compatible endpoint

Use this if your tooling expects the native Anthropic format.

Headers

Header	Required	Description
x-api-key	Required	Your API key
anthropic-version	Optional	API version (format: YYYY-MM-DD, e.g. 2023-06-01)

Example

curl -X POST https://api.unlimitedclaude.com/api/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4.6",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Explain quantum computing in simple terms."}
    ]
  }'

Response

json

{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-4.6",
  "content": [
    {
      "type": "text",
      "text": "Quantum computing uses quantum bits (qubits) that can exist in multiple states simultaneously..."
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 15,
    "output_tokens": 64
  }
}

Streaming

Set "stream": true in your request body to receive Server-Sent Events (SSE). The response streams token-by-token instead of waiting for the full completion.

bash

curl -X POST https://api.unlimitedclaude.com/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "model": "claude-sonnet-4.6",
    "stream": true,
    "messages": [{"role": "user", "content": "Write a haiku about coding."}]
  }'

Streaming responses use Content-Type: text/event-stream and follow the standard SSE format. Each chunk is prefixed with data:.

Response

json

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"delta":{"content":"Silent"},"index":0}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"delta":{"content":" keys"},"index":0}]}

data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","choices":[{"delta":{},"index":0,"finish_reason":"stop"}]}

data: [DONE]

Models

Available models depend on your plan. All models are accessed through the same endpoints.

free Plan4 models

claude-haiku-4.5claude-sonnet-4.6deepseek-3.2minimax-m2.1

starter Plan9 models

auto-kiroclaude-3.7-sonnetclaude-haiku-4.5claude-sonnet-4claude-sonnet-4.5claude-sonnet-4.6deepseek-3.2minimax-m2.1qwen3-coder-next

pro Plan11 models

auto-kiroclaude-3.7-sonnetclaude-haiku-4.5claude-opus-4.5claude-opus-4.6claude-sonnet-4claude-sonnet-4.5claude-sonnet-4.6deepseek-3.2minimax-m2.1qwen3-coder-next

Need access to more models? Upgrade your plan to unlock the full model catalog including Claude Opus.

Rate Limits

Limits are applied per-user based on your plan. Exceeding limits returns a 429 status.

Plan	Daily Requests	Concurrent Requests
free	5,000	1
starter	20,000	3
pro	50,000	10

Rate limit headers are included in every response: X-RateLimit-Remaining and X-RateLimit-Reset.

Error Codes

Standard HTTP status codes indicate success or failure.

Status	Meaning	Resolution
200	Success	Request completed successfully
400	Bad Request	Check your request body and parameters
401	Unauthorized	Verify your API key is correct
403	Forbidden	Model not on your plan, or email not verified
429	Rate Limited	Wait or upgrade your plan for higher limits
502	Upstream Error	Model provider issue — retry after a moment

Error Response Format

json

{
  "error": "Daily request limit reached. Upgrade your plan for more requests."
}

Claude Code Setup

Use UnlimitedClaude as the backend for Claude Code across CLI, VS Code, and other editors.

1. Terminal (CLI)

Set these environment variables to route Claude Code CLI requests through UnlimitedClaude.

export ANTHROPIC_BASE_URL=https://api.unlimitedclaude.com/api/v1
export ANTHROPIC_API_KEY=YOUR_API_KEY

# To persist, add to your shell profile:
echo 'export ANTHROPIC_BASE_URL=https://api.unlimitedclaude.com/api/v1' >> ~/.bashrc
echo 'export ANTHROPIC_API_KEY=YOUR_API_KEY' >> ~/.bashrc
source ~/.bashrc

2. VS Code Extension

If you use the Claude Code VS Code extension, configure it through VS Code settings.

Open VS Code Settings

Press Ctrl + , (Windows/Linux) or Cmd + , (macOS) to open Settings.

Search for Claude Code

Type claude code in the search bar, then find the Environment Variables setting.

Add environment variables

Click Edit in settings.json and add the configuration below.

json

// settings.json
{
  "claude-code.environmentVariables": {
    "ANTHROPIC_BASE_URL": "https://api.unlimitedclaude.com/api/v1",
    "ANTHROPIC_API_KEY": "YOUR_API_KEY"
  }
}

3. Cursor / Other Editors

For Cursor or any editor that supports Claude, set the same environment variables in your system or shell profile. Most editors pick them up automatically.

json

// Cursor: Settings > Models > Claude
// Set the API Base URL to:
https://api.unlimitedclaude.com/api/v1

// Set the API Key to:
YOUR_API_KEY

After updating settings, restart your editor or terminal for the changes to take effect. You can verify the connection by running a quick prompt in Claude Code.

SDK Integration

Use your preferred SDK — just point it at the UnlimitedClaude base URL.

Python (OpenAI SDK)

python

from openai import OpenAI

client = OpenAI(
    base_url="https://api.unlimitedclaude.com/api/v1",
    api_key="YOUR_API_KEY",
    default_headers={"x-api-key": "YOUR_API_KEY"},
)

response = client.chat.completions.create(
    model="claude-sonnet-4.6",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

Python (Anthropic SDK)

python

import anthropic

client = anthropic.Anthropic(
    base_url="https://api.unlimitedclaude.com/api/v1",
    api_key="YOUR_API_KEY",
)

message = client.messages.create(
    model="claude-sonnet-4.6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}],
)
print(message.content[0].text)

JavaScript / TypeScript

typescript

const response = await fetch("https://api.unlimitedclaude.com/api/v1/chat/completions", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-api-key": "YOUR_API_KEY",
  },
  body: JSON.stringify({
    model: "claude-sonnet-4.6",
    messages: [{ role: "user", content: "Hello!" }],
  }),
});

const data = await response.json();
console.log(data);

Ready to get started?

Create a free account and get your API key in seconds. No credit card required.

API Documentation

Quick Start

Authentication

Base URL

Chat Completions

Request Body

Example

Messages API

Headers

Example

Streaming

Models

free Plan4 models

starter Plan9 models

pro Plan11 models

Rate Limits

Error Codes

Error Response Format

Claude Code Setup

1. Terminal (CLI)

2. VS Code Extension

3. Cursor / Other Editors

SDK Integration

Python (OpenAI SDK)

Python (Anthropic SDK)

JavaScript / TypeScript

Ready to get started?

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