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All API requests require an API key.

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Get your API key

Go to Settings → API after creating an account.

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Usage

Pass your key via header (recommended): 
curl https://virtualsms.io/api/v1/balance \
  -H "x-api-key: YOUR_API_KEY"
Or via query parameter: 
curl "https://virtualsms.io/api/v1/balance?api_key=YOUR_API_KEY"
Never expose your API key in client-side code or public repositories.

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Errors

StatusMeaning
401 UnauthorizedMissing or invalid API key
403 ForbiddenKey valid but insufficient permissions
429 Too Many RequestsRate limit exceeded