Claude Messages

For the Anthropic SDK or tools that call the Messages API, use:

• Base URL: https://apimaster.ai (site root, no /v1; OpenAI uses https://apimaster.ai/v1)
• API key: your APIMaster token

Example:

curl -s "https://apimaster.ai/messages" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 256,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Some clients send Authorization: Bearer instead of x-api-key. If one returns 401, try the other.

Claude Code / Desktop

1. Open API Provider / Custom API in settings.
2. API URL: https://apimaster.ai (no /v1)
3. API Key: APIMaster console token.
4. Model: e.g. claude-sonnet-4-6 (list).

See Claude Code for CLI env vars.