Underground Lottery in Thailand

What huay tai din is

Huay tai din, literally "underground lottery," is a numbers game run by private bookies across Thailand. It has no tickets, no draws of its own and no state involvement. Instead, bookies take bets on numbers that other people draw: the winning figures of the official Thailand lottery, the closing digits of the Stock Exchange of Thailand index, and the closing numbers of foreign stock markets such as the Nikkei and the Dow Jones².

The game exists because the official lottery leaves a gap. The government lottery draws only twice a month, offers long odds on its big prizes, and sells tickets at a fixed price of THB 80⁴. The underground game runs far more often, accepts tiny stakes, and lets players bet on single digits, pairs and permutations that the official lottery does not offer⁵. It is one of the most widespread forms of illegal gambling in the country, and police have described fighting it as a long-odds battle, since online bookies simply reopen under new names when one channel is shut down².

The results the bookies use are public and verifiable. When the Government Lottery Office announces its results, or when the SET index closes, the underground numbers are settled from those same figures. The bookmaker's profit comes from the payout rates, which are always set below the true mathematical odds of the bet⁶.

Bet types and what you can bet on

The classic underground bets are on the last two or three digits of the official government lottery's first prize². Around those core bets, bookies have built a wider menu:

• Two-digit bets (last two digits): you win if the last two digits of the first prize match your number².
• Three-digit bets (last three digits): the same idea with three digits, paying much more when it hits².
• Three-digit front: betting on the first three digits of the first prize⁵.
• Single-digit betting (lek diao): betting on one digit appearing in a set position⁵.
• Lek ber (paired numbers): bets on doubled digits such as 33, 55 or 88, which pay a reduced rate¹.
• Stock lottery: bets on the last two digits after the decimal point of the SET index closing figure, and on the closing numbers of markets such as the Nikkei, Hang Seng and Dow Jones².
• Credit betting: many bookies let regular customers bet first and settle up later, a system that keeps players tied to one house⁵.

Online underground services have added more variety. Sites serving Thai players typically offer the Thai government lottery, the Lao lottery, the Hanoi lottery, the stock lottery and Yeekee lottery side by side, so a player can bet on several draws in one account⁷. The same platforms publish their payout tables openly, for example around 900 to 950 baht per baht for a three-digit straight hit, 150 baht for a three-digit permutation, 90 baht for a two-digit top or bottom hit, and 3.2 to 4.2 baht for single-digit running bets⁷.

Draw days and closing times

The main underground draws follow the official calendar. The Government Lottery Office draws on the 1st and 16th of every month, with a few exceptions: the New Year draw is held on December 30, the Teachers' Day draw on January 17, and the Labour Day draw on May 2, and draws are moved when they fall on an important religious day⁸. Results are broadcast from about 14:30 to 16:00⁸.

The underground game rides on those same dates. Results settle at about 15:30, and betting closes about an hour earlier, around 14:30¹. Some bookmakers close betting a full day in advance when a widely expected "hot" number is circulating, to avoid taking heavy losses if it comes up, and some refuse paired or triple numbers entirely for the same reason¹.

The stock lottery runs on its own daily schedule, with four rounds a day: the Nikkei at 13:00, the Hang Seng at 15:00, Thai stocks at 16:30, and the Dow Jones at 04:00. Betting closes 30 minutes before each draw, which means Dow Jones bets close around 03:30. The stock rounds are closed on Saturday and Sunday, except the Dow Jones round, which closes Sunday and Monday¹.

Stakes: how small the bets are

This is where the underground game most clearly differs from the official lottery. A government ticket costs a fixed THB 80⁴, and popular "pretty" numbers sold on the street can go for 110 baht or more⁹. The underground game, by contrast, accepts very small wagers: street bets start at around THB 10 to 20¹.

Online underground services go lower still. One documented service accepted bets from just THB 1, with a starting account cost of THB 300 or more¹. That low entry point is a large part of the game's appeal, and it is also why the payouts are quoted per baht: a "70 baht" payout means 70 times whatever you staked.

Payouts: THB 60-70 for two digits, 400-500 for three

Payout rates vary by region and by bookmaker, but they cluster in a narrow band. For a two-digit win, bookies typically pay THB 60 to 70 per baht staked; in some southern provinces such as Phuket the rate reaches 70, while elsewhere it sits at 60 to 65¹. Press reporting on the game puts the typical range slightly wider, at 65 to 80 baht for two correct numbers².

For a three-digit win, the typical payout is THB 400 to 500 per baht. Some areas pay 450, some 500, and rates have been cut over time: one research account records a reduction from 450 to 500 baht down to 400 baht for the three-digit top, and from 65 down to 60 baht for the two-digit top and bottom¹. Press reporting puts the three-digit payout at around 500 baht per baht, with some bookies paying up to 750².

A few special cases pay differently:

The "above-ground" variant, huay bon din, is a semi-open form of the same game sold in ticket form at THB 20, 50 or 100 per ticket, with payouts of 55 baht per baht for two digits and 400 for three¹. The stock lottery pays the best two-digit rate at 80 baht per baht, because its draws are daily and its bookies adjust the odds accordingly¹.

Odds versus the official government lottery

The underground game's real selling point is frequency of winning. A two-digit bet has a 1 in 100 chance of hitting³. In other words, a two-digit underground player wins, on average, once every hundred draws, while an official first-prize player faces far longer odds on the government's biggest prize.

The trade-off is size. The official lottery offers 14,168 prizes per set, totaling THB 48,000,000 if a set sells out, including a first prize worth millions¹¹. Its smaller prizes include a three-digit front prize of THB 4,000 per winning ticket¹². Winners have two years from the draw date to claim, after which the money goes to state revenue¹¹.

Compare that with the underground game: a THB 10 two-digit bet at 70 baht per baht returns THB 700. A THB 10 three-digit bet at 500 returns THB 5,000. The wins are real but modest, and the house edge is built into every rate: the payout is always set below the true mathematical odds of the bet⁶.

The Lao lottery (Huay Phathana) and other alternatives

The Lao lottery, Huay Phathana, is Laos' own state lottery, drawn three times a week, every Monday, Wednesday and Friday at 8:30pm¹⁰. It is legal in its home country, but it remains strictly prohibited under Thai law, and in Thailand it operates only through online channels¹⁰.

Its appeal for Thai punters is straightforward. The entry point is low, with tickets starting at 1,000 kip, about THB 1.48. The two-digit prize can pay up to 30 percent more than the Thai underground equivalent. And the four-digit prize is generous by comparison: a modest investment of 120 baht can yield up to 120,000 baht¹⁰. With three draws a week instead of two a month, it also offers far more action than either the official Thai lottery or the traditional underground calendar¹⁰.

Beyond the Lao game, Thai players betting through underground and offshore channels can reach several other lotteries: the Hanoi lottery, the Malaysian lottery, the stock lottery and Yeekee lottery, a community numbers game that predates them all⁷. Historically, Thais have also placed bets on foreign lotteries by telephone through contacts in Laos, Cambodia, Malaysia and Singapore¹⁴. All of this sits outside what Thai law permits, which is limited to the state lottery and betting on state-controlled horse races¹⁵.

Legal status: illegal for players and operators

The underground lottery is illegal in Thailand for the people who run it and the people who bet on it. It operates without any official permission, and its results are simply lifted from the government lottery or the Government Savings Bank lottery numbers, with payouts set by each bookmaker⁶. The wider gambling law, the Gambling Act of 1935, tightly restricts all gambling, and the only forms available are the state lottery and state-run horse racing¹⁶.

This applies to everyone in the country, Thai or foreign. Using offshore betting sites is illegal for Thai residents regardless of where the operator itself is based¹⁶. The Government Lottery Office has also warned that tickets sold through unofficial online platforms and vending machines are not official, and that buyers through such channels may be charged more than the official THB 80 price¹⁷.

Penalties for players

Players caught betting on the underground lottery face imprisonment of between three months and three years, with a fine of between THB 500 and THB 5,000². Other reporting on the same law puts the maximum at three years in prison and a fine of up to THB 5,000¹⁸. In practice, people found gambling are usually fined rather than jailed, depending on the severity of the case¹⁶.

For foreigners, the laws apply in the same way, and the authorities have been known to hold foreigners in jail while awaiting deportation, with fines and deportation the common outcome¹⁶. There is a further practical risk that applies to anyone betting online: punters' personal bank accounts may be frozen for investigation, and police have arrested holders of thousands of online gambling accounts in single operations¹⁸.