curl -X POST \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"market_id": "0x91836...18391"}' \
  https://polychadsbot.xyz/api/v1/user/watchlist

{
  "market_id": "0x91836...18391",
  "starred": true
}

{
  "market_id": "0x91836...18391",
  "starred": false
}

{
  "detail": "Invalid market_id"
}