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Every request to the StellarTools API must include your API key in the x-api-key header. 
curl https://api.stellartools.dev/customers \
  -H "x-api-key: YOUR_API_KEY"
The API key determines the environment your requests run in. Keys prefixed for testnet only interact with testnet data; mainnet keys interact with live data. There is no separate base URL — the key controls it.

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Getting an API key

Go to dashboard.stellartools.dev/api-keys to create and manage your keys. Copy the key immediately after creating it — it will not be shown again. 
STELLAR_TOOLS_API_KEY=sk_test_...
Store it in an environment variable and never expose it in client-side code.

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Errors

If the key is missing, the API returns 401: 
{ "error": "Session Token or API Key or App Token required" }
If the key is present but invalid or revoked, the API returns 401 as well. Double-check that you are sending the right key for the right environment (testnet vs. mainnet).