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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) - USD ($)
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Revenues $ 283,039 $ 46,175
Minimum    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Payment term for accounts receivables 3 months  
Maximum    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Payment term for accounts receivables 6 months  
SEM services    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Revenues $ 150,707 2,953
Non-SEM services    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Revenues 132,332 43,222
Rebates and incentives offered by publishers    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Revenues 96,348 20,200
Net fees from advertisers    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Revenues $ 186,691 $ 25,975