API Documentation

Build with OrProject.

Anthropic-compatible Messages API & OpenAI-compatible Chat Completions.

OrProject API Documentation

Complete guide to using the OrProject API service — a fully compatible Anthropic Claude API.

Quick Start

The OrProject API is fully compatible with Anthropic's Messages API. Simply replace the base URL and use your OrProject API key.

Base URL: https://orproject.online/v1

Authentication

Include your API key in the x-api-key header or as Authorization: Bearer sk-ant-...

curl https://orproject.online/v1/messages \
  -H "x-api-key: sk-ant-YOUR_KEY_HERE" \
  -H "content-type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Hello, Claude!"}]
  }'

Supported Models

Model ID Provider Tier Input $/1M tokens Output $/1M tokens
claude-opus-4-8AnthropicComplex reasoning$15.00$75.00
claude-opus-4-7AnthropicComplex reasoning$15.00$75.00
claude-opus-4-6AnthropicComplex reasoning$15.00$75.00
claude-opus-4-5AnthropicComplex reasoning$15.00$75.00
claude-sonnet-4-6AnthropicBalanced performance$3.00$15.00
claude-sonnet-4-5AnthropicBalanced performance$3.00$15.00
claude-haiku-4-5AnthropicSpeed-optimized$0.80$4.00
fableAnthropicTemporarily unavailable——

API Endpoints

Messages API (Anthropic-compatible)

POST /v1/messages

Create a message using the Anthropic Messages API format. Supports streaming, tool use, and all standard parameters.

{
  "model": "claude-sonnet-4-5",
  "max_tokens": 4096,
  "messages": [
    {"role": "user", "content": "Explain quantum computing"}
  ],
  "stream": false
}

Streaming

Set "stream": true to receive Server-Sent Events (SSE). The response follows Anthropic's streaming format:

event: message_start
data: {"type":"message_start","message":{...}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn"},"usage":{"output_tokens":15}}

event: message_stop
data: {"type":"message_stop"}

Tool Use

Full tool use support. Define tools in your request:

{
  "model": "claude-sonnet-4-5",
  "max_tokens": 1024,
  "tools": [
    {
      "name": "get_weather",
      "description": "Get current weather",
      "input_schema": {
        "type": "object",
        "properties": {
          "location": {"type": "string", "description": "City name"}
        },
        "required": ["location"]
      }
    }
  ],
  "messages": [{"role": "user", "content": "What's the weather in Paris?"}]
}

Chat Completions (OpenAI-compatible)

POST /v1/chat/completions

OpenAI-compatible endpoint for tools like OpenCode, Codex, OpenClaw, and IDE integrations.

curl https://orproject.online/v1/chat/completions \
  -H "Authorization: Bearer sk-ant-YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5",
    "messages": [{"role": "user", "content": "Hello!"}],
    "max_tokens": 1024
  }'

List Models

GET /v1/models

Returns all available models.

Backend & Memory

OrProject is a thin Anthropic-compatible front for a Provider instance that itself rotates a pool of Claude Web accounts.

Setting Environment Variables

Most clients (Claude Code, OpenCode, Codex CLI, Aider, custom scripts) read the API key and base URL from environment variables. Pick the snippet for your operating system and shell.

macOS & Linux (bash / zsh)

For a one-off session, just paste this into your terminal:

export ANTHROPIC_BASE_URL=https://orproject.online
export ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE
# Some clients also expect the OpenAI variables:
export OPENAI_BASE_URL=https://orproject.online/v1
export OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

To make it permanent, append the same lines to your shell profile (~/.zshrc on modern macOS, ~/.bashrc or ~/.bash_profile on Linux), then run source ~/.zshrc (or open a new terminal).

Windows — PowerShell (recommended)

Per-session (variables disappear when the shell closes):

$env:ANTHROPIC_BASE_URL = "https://orproject.online"
$env:ANTHROPIC_API_KEY  = "sk-ant-YOUR_KEY_HERE"
$env:OPENAI_BASE_URL    = "https://orproject.online/v1"
$env:OPENAI_API_KEY     = "sk-ant-YOUR_KEY_HERE"

Permanent (saved into your Windows user profile, applies to every new shell):

[Environment]::SetEnvironmentVariable("ANTHROPIC_BASE_URL", "https://orproject.online", "User")
[Environment]::SetEnvironmentVariable("ANTHROPIC_API_KEY",  "sk-ant-YOUR_KEY_HERE",     "User")
[Environment]::SetEnvironmentVariable("OPENAI_BASE_URL",    "https://orproject.online/v1", "User")
[Environment]::SetEnvironmentVariable("OPENAI_API_KEY",     "sk-ant-YOUR_KEY_HERE",     "User")

Close the PowerShell window and open a new one — the new variables are now visible to every CLI/IDE.

Windows — CMD (cmd.exe)

Per-session:

set ANTHROPIC_BASE_URL=https://orproject.online
set ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE
set OPENAI_BASE_URL=https://orproject.online/v1
set OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

Permanent (saves to the user environment):

setx ANTHROPIC_BASE_URL "https://orproject.online"
setx ANTHROPIC_API_KEY  "sk-ant-YOUR_KEY_HERE"
setx OPENAI_BASE_URL    "https://orproject.online/v1"
setx OPENAI_API_KEY     "sk-ant-YOUR_KEY_HERE"

Open a fresh CMD window after running setx — the variables are not visible in the current one.

Windows — GUI (Settings → Environment Variables)

  1. Press Win + R, type sysdm.cpl, press Enter.
  2. Go to the Advanced tab → Environment Variables…
  3. Under User variables, click New… and add:
    • ANTHROPIC_BASE_URL = https://orproject.online
    • ANTHROPIC_API_KEY = your sk-ant-… key
    • OPENAI_BASE_URL = https://orproject.online/v1
    • OPENAI_API_KEY = your sk-ant-… key
  4. Click OK twice and restart your terminal / IDE.

Docker / docker-compose

services:
  claude-code:
    image: your-image
    environment:
      ANTHROPIC_BASE_URL: https://orproject.online
      ANTHROPIC_API_KEY: sk-ant-YOUR_KEY_HERE
      OPENAI_BASE_URL: https://orproject.online/v1
      OPENAI_API_KEY: sk-ant-YOUR_KEY_HERE

systemd unit (Linux server)

[Service]
Environment=ANTHROPIC_BASE_URL=https://orproject.online
Environment=ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE
Environment=OPENAI_BASE_URL=https://orproject.online/v1
Environment=OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

.env file (Node / Python projects)

# project root, loaded via dotenv
ANTHROPIC_BASE_URL=https://orproject.online
ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE
OPENAI_BASE_URL=https://orproject.online/v1
OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

Integration Guides

/app → Settings → API keys). The base URL is the OrProject host (the same one you used to load this page)." data-ru="Во всех IDE-плагинах ниже API key — это sk-ant-... токен из настроек вашего аккаунта (войдите на /app → Настройки → API-ключи). Base URL — хост OrProject (тот же, с которого вы открыли эту страницу).">Your API key is the sk-ant-... token from your account settings at /app. The base URL is the OrProject host.

Claude Code

Configure Claude Code to use the OrProject API:

# Set the API base URL and key
export ANTHROPIC_BASE_URL=https://orproject.online/v1
export ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE

# Launch Claude Code
claude

Or in your Claude Code config file (~/.claude/settings.json):

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://orproject.online/v1",
    "ANTHROPIC_API_KEY": "sk-ant-YOUR_KEY_HERE"
  }
}

OpenCode

# Environment variables
export ANTHROPIC_BASE_URL=https://orproject.online/v1
export ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE

# Or for OpenAI-compatible mode
export OPENAI_BASE_URL=https://orproject.online/v1
export OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

Codex CLI

# Configure Codex to use OrProject
export OPENAI_BASE_URL=https://orproject.online/v1
export OPENAI_API_KEY=sk-ant-YOUR_KEY_HERE

OpenClaw

# Set in your .env or shell
ANTHROPIC_BASE_URL=https://orproject.online/v1
ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE

Cline (VS Code)

In Cline's settings, choose Anthropic as the provider, then:

Continue.dev (VS Code & JetBrains)

Edit ~/.continue/config.json:

{
  "models": [
    {
      "title": "OrProject — Claude v4 Pro",
      "provider": "anthropic",
      "model": "claude-sonnet-4-5",
      "apiKey": "sk-ant-YOUR_KEY_HERE",
      "apiBase": "https://orproject.online"
    }
  ]
}

Roo Code / Cursor / generic Anthropic clients

ANTHROPIC_BASE_URL=https://orproject.online
ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE

Generic IDE Integration

For any plugin that supports a custom Anthropic-style endpoint:

  1. Open extension settings
  2. Set API Base URL to https://orproject.online/v1
  3. Set API Key to your sk-ant-... key
  4. Select any Claude model

cURL Test

# Non-streaming test
curl -X POST https://orproject.online/v1/messages \
  -H "x-api-key: sk-ant-YOUR_KEY" \
  -H "content-type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 256,
    "messages": [{"role":"user","content":"Say hello and tell me who you are."}]
  }'

# Streaming test
curl -X POST https://orproject.online/v1/messages \
  -H "x-api-key: sk-ant-YOUR_KEY" \
  -H "content-type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 256,
    "stream": true,
    "messages": [{"role":"user","content":"Tell me a short joke."}]
  }'

VS Code: step-by-step setup

The following walkthroughs were captured against this same OrProject deployment. The plugin GUIs change occasionally — fields stay the same, just the layout drifts.

Cline (recommended for code-editing tasks)

  1. Install Cline from the VS Code marketplace (publisher: saoudrizwan).
  2. Open the Cline sidebar and click the gear icon to enter settings.
  3. Set API Provider = Anthropic.
  4. Set API Key = your sk-ant-... from your account settings at /app.
  5. Set Custom Base URL = https://orproject.online (Cline appends /v1 internally).
  6. Pick any Claude-family model in the model dropdown.
  7. Click Done, then ask Cline to read or write a file in your workspace.

Cline's API Provider settings — Anthropic + custom base URL pointing to OrProject:

Cline setup

Real Cline run through OrProject — read a Python file, then write a new utils.py:

Cline diff view

Cline wrote utils.py

Claude Code CLI (terminal)

Anthropic's official Claude Code CLI works through OrProject as long as you point its ANTHROPIC_BASE_URL at us. The CLI manages conversation history itself, so multi-turn dialogues "just work".

# macOS / Linux
export ANTHROPIC_BASE_URL=https://orproject.online
export ANTHROPIC_API_KEY=sk-ant-YOUR_KEY_HERE
claude   # opens an interactive Claude Code session

Or persist it for VS Code's integrated terminal by writing to ~/.claude/settings.json:

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://orproject.online",
    "ANTHROPIC_API_KEY": "sk-ant-YOUR_KEY_HERE"
  }
}

Continue.dev (VS Code & JetBrains)

  1. Install Continue from the marketplace.
  2. Open ~/.continue/config.json and add a model entry pointing at OrProject:
{
  "models": [
    {
      "title": "OrProject — Claude (Claude backend)",
      "provider": "anthropic",
      "model": "claude-sonnet-4-5",
      "apiKey": "sk-ant-YOUR_KEY_HERE",
      "apiBase": "https://orproject.online"
    }
  ]
}

After saving, Continue picks up the model immediately — open the chat panel, select the model, and chat normally. Continue manages its own conversation thread per chat tab.

Conversation memory & tool loops

OrProject is a stateless proxy — it does not keep its own copy of your dialogue. Each request must contain the full message history; whatever the IDE plugin sends is what the model sees.

Usage Tracking

View your API usage and remaining budget at /usage. Enter your API key to see:

Rate Limits & Budgets

Each API key has a budget (set by admin). When the budget is exhausted, requests will return a 429 error. Contact your administrator to increase the budget.

Error Handling

Errors follow the Anthropic error format:

{
  "type": "error",
  "error": {
    "type": "authentication_error",
    "message": "Invalid API key."
  }
}
StatusTypeDescription
401authentication_errorInvalid or missing API key
403permission_errorAPI key disabled
429rate_limit_errorBudget exceeded
500api_errorInternal server error