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Cline API Key Setup — VS Code & Cursor Configuration Guide

How to set a custom API key for Cline in VS Code or Cursor. Choose OpenAI Compatible provider, set base URL to APIMaster.ai, and enter your model ID to use Claude, GPT-5.4, or DeepSeek at discounted pricing.

Cline (saoudrizwan.claude-dev) is an autonomous coding agent for VS Code / Cursor. Use OpenAI Compatible with APIMaster’s base URL and model id.

Get API Key first. Copy model id from the marketplace.

Prerequisites

  • VS Code or Cursor
  • APIMaster API Key
  • Target model id from the marketplace

Step 1 — Install Cline

Search Cline by saoudrizwan in Extensions and install.

Install Cline

code --install-extension saoudrizwan.claude-dev

Step 2 — API settings

  1. Open the Cline sidebar.
  2. Click Settings (gear icon).
  3. Open API Configuration.

API Configuration

Field Value
API Provider OpenAI Compatible
Base URL https://apimaster.ai/v1
API Key Your APIMaster key
Model ID Marketplace id, e.g. claude-sonnet-4-6, gpt-5.5

Click Done.

Step 3 — Chat

Send a test message. The footer should show openai-compat:<model-id>.

Chat session

Model ids (examples)

claude-haiku-4-5, claude-sonnet-4-6, claude-opus-4-8, gpt-5.4, gpt-5.5, deepseek-v4-pro, minimax-m3 — see marketplace.

Troubleshooting

Issue Fix
401 Check API Key
404 Re-copy Model ID from marketplace
Wrong provider Set OpenAI Compatible, click Done

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