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Make Your First Request

The Krown Marketplace API is completely free and open. No authentication required for read operations. 
curl https://api.krownlabs.app/api/collections

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Common Use Cases

Fetch all whitelisted NFT collections on Sonic:
curl "https://api.krownlabs.app/api/collections?page=1&limit=20"
Get detailed information about a specific collection:
curl "https://api.krownlabs.app/api/collections/0x1234...5678"
Fetch all NFTs owned by a wallet address:
curl "https://api.krownlabs.app/api/users/{identifier}/nfts"
Get the latest marketplace activities (sales, transfers, etc.):
curl "https://api.krownlabs.app/api/activities?limit=50"

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Response Structure

All API responses follow a consistent structure: 
{
  "collections": [...],      // or "tokens", "activities", etc.
  "pagination": {
    "page": 1,
    "limit": 50,
    "total": 1000,
    "totalPages": 20,
    "hasNextPage": true,
    "hasPrevPage": false
  }
}

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Query Parameters

Most list endpoints support these common parameters:
ParameterTypeDescriptionDefault
pagenumberPage number for pagination1
limitnumberNumber of results per page50
sortBystringField to sort byvaries
sortOrderstringasc or descdesc

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Next Steps

Explore Collections API

Learn about collection endpoints

Query NFTs

Discover token endpoints

Track Activities

Monitor marketplace events

Rate Limits

Understand API usage limits