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Atlas supports two ways to connect

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OAuth (Claude.ai and ChatGPT)

When you add Atlas as a custom connector in Claude or ChatGPT, you’ll be sent to Atlas to choose a merchant and approve access. Atlas remembers your choice — to switch merchants, re-approve from your assistant’s connector settings To get listed, contact your Atlas account manager so we can register your client first

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API token (Claude Code, Codex, and other tools)

For developer tools that don’t support the approval screen, authenticate with two headers. Generate an API token from your Atlas merchant portal and pass it as the X-Api-Key value:
HeaderValue
X-Api-KeyYour Atlas API token
X-Merchant-IdTells Atlas which merchant the request is for
curl -X POST https://mcp.atlas.kitchen \
  -H "X-Api-Key: your-api-token" \
  -H "X-Merchant-Id: your-merchant-id" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
The portal shows the token plaintext only once at creation — copy it somewhere safe before closing the dialog. Don’t share API tokens in public code or screenshots