Smartlead API Reference

Authentication

All requests use query parameter auth: ?api_key={SMARTLEAD_API_KEY}

Environment variable: $SMARTLEAD_API_KEY

Base URL: https://server.smartlead.ai/api/v1

Rate Limiting

• Standard plan: 2,000 req/min (33 req/sec)
• Higher plans: 3,000 req/min (50 req/sec)
• Retry on 429 and 5xx with exponential backoff
• For bulk operations, use p-limit or PQueue with 8-15 concurrency

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