A basketball-focused Chinese-market sportsbook reportedly licensed by the Isle of Man, with a real risk of confusion from unofficial mirror domains using its name
Not available lawfully hereIs Biying (必赢) legal in China?
No. Real-money gambling is banned in China. Under China's gambling prohibition, in force since in force, Biying (必赢) cannot lawfully offer you a welcome bonus here, and you cannot lawfully claim one.
All gambling is illegal in mainland China apart from the state-run welfare and sports lotteries. Offshore operators are blocked and cross-border gambling is a law-enforcement priority. source
Any Biying (必赢) bonus you see advertised for China is offered from an offshore site operating against local law. Your payments can be blocked, your account can vanish with a mirror domain, and no China regulator can help you recover funds. We therefore show no offer and no sign-up link on this page. See every licensed betting site in China →
Pros
- A named, established brand under Mayfly Entertainment with a recognizable ambassador
- Reportedly holds an Isle of Man licence, a reputable regulator if accurate
Cons
- The Isle of Man licensing claim could not be independently verified against the regulator's own register in this pass
- Multiple domains using the Biying/bwin-biying name appear unrelated or potentially fraudulent - a real impersonation risk
- Operates in China's banned private-gambling gray zone
- No regulated welcome bonus available in China
Our verdict
Biying is a named, established basketball-focused betting brand under Mayfly Entertainment, reportedly holding an Isle of Man licence - a reputable regulator if that claim holds up, though we could not independently confirm it against the regulator's own register in this pass. China's outright ban on private online gambling means Biying operates there in a legal gray zone regardless. We want to flag a specific, practical concern directly: our research turned up multiple domains using the Biying or 'bwin-biying' name that appear unrelated to legitimate sports betting or show signs of being unofficial mirror sites - a genuine impersonation risk. Bettors should take real care to confirm they're using Biying's actual official domain rather than a similarly-named imitation before depositing any funds. No regulated welcome bonus is available given China's gambling ban. Given the unverified licensing claim and the documented domain-impersonation risk, we'd recommend proceeding with real caution and verifying the official Biying domain independently before use.
How we rated it
Sportsbook & casino (36%)6.5
A basketball-first sportsbook covering NBA, CBA, CSL, and Esports, under Mayfly Entertainment with a named brand ambassador (Tracy McGrady).
Trust & licensing (27%)4
Reportedly holds an Isle of Man licence, a reputable regulator if accurate, though we could not independently verify this directly against the regulator's own register. China bans private online gambling outright, so Biying operates there in a legal gray zone regardless.
Support & reliability (18%)3.5
We found multiple domains using the Biying/bwin-biying name that appear unrelated or potentially fraudulent, a real impersonation risk explicitly worth verifying against before using any specific domain.
Bonuses & value (18%)2
No regulated welcome bonus - online gambling is restricted/banned in China; Biying operates there as an offshore operator.
Quick facts
| Owner | Mayfly Entertainment |
| Licence | Reportedly Isle of Man Gambling Supervision Commission - not independently verified against the regulator's own register in this pass |
| China legal status | Private online gambling is banned in China; Biying operates there offshore/in a legal gray zone |
| Domain-impersonation risk | Multiple domains using the Biying/bwin-biying name appear unrelated or potentially fraudulent - verify the official domain before use |
| China bonuses | No regulated welcome bonus - online gambling is restricted/banned in China |
How we verified this
The Isle of Man licensing claim and Mayfly Entertainment brand ownership are per independent Chinese-language betting-industry sources describing the operator's own materials; we could not independently verify the licence directly against the Isle of Man Gambling Supervision Commission's own register in this pass. The domain-impersonation concern (unrelated/suspicious content on bwin-biying.net and similar domains) is a direct observation from the search results themselves.
Where Biying (必赢) is licensed
Biying (必赢) appears on the official register in 1 countries. Highlighted countries have a full local review — pick yours for its welcome bonus and licence details.
Asia (1)
About Biying (必赢)
Biying (必赢) is a basketball-first sports betting brand under Mayfly Entertainment, targeting Chinese-speaking bettors with coverage of the NBA, CBA, CSL, and Esports, and featuring former NBA player Tracy McGrady as brand ambassador. Independent Chinese-language sources describe Biying as one of only three Chinese-facing betting platforms reportedly holding an Isle of Man Gambling Supervision Commission licence - a genuinely reputable regulator if this claim holds up, though we could not independently verify it directly against the Isle of Man's own register in this pass. China bans private online gambling outright under its Welfare Lottery/Sports Lottery state monopoly, so Biying operates there in a legal gray zone regardless of its offshore licensing claim. We want to flag a specific, real concern directly: our research surfaced multiple domains using the Biying or 'bwin-biying' name (such as bwin-biying.net) that display content unrelated to sports betting and show signs of being unofficial or potentially fraudulent mirror or redirect sites - a genuine name-impersonation risk that means bettors should carefully verify they are using Biying's actual official domain rather than a similarly-named imitation. No regulated welcome bonus is available in China given the outright ban on private online gambling there.