The social prediction platform
Social. Markets. Settled.
Post your predictions.
01 / Feed × markets
Every post can carry a market.
A social feed with posts, stories, reels, and DMs. The twist is that you can attach a YES/NO market to anything you post. Friends take the other side right from the post card. Shares are priced in cents, pay out $1 if you win, and trade on a real order book.
- ▸Creating a market from a post is free. A $1 opening bet gets it started.
- ▸Always know where a market stands: OPENMATCHEDSETTLINGSETTLEDYES
- ▸YES at 62¢ means the crowd puts the odds at 62%. Price is probability.
Will the Warriors win game 7 tonight?
MATCHEDWill it rain in San Francisco on Saturday?
SETTLEDNOOne signature, start to finish
You sign once
One signature approves your order and its payment together. There is nothing else to confirm.
Thassa submits it
Your order is bundled with others and placed onchain for you. Thassa pays the gas, not you.
The book matches
You fill at the best available price, never worse than your limit. Whatever doesn't fill waits on the book.
02 / Gasless trading
One signature. Zero gas.
There is no deposit step and nothing to bridge. When you trade, money moves straight from your wallet into the market. Thassa never holds your keys or your funds. One signature approves the order and its payment together, so there is exactly one thing to confirm. Want the details? Read the docs.
1
signature per trade
0
gas paid by users
100%
self-custodied
03 / Settlement
Settled in the open, against named sources.
Every market declares how it will settle before a single share trades: the question, the resolution rule, and the exact sources that decide it. Anyone can inspect them. When it’s time to settle, Thassa checks those sources, and nothing pays out until the result is verified onchain.
- ▸Facts and figures settle on one named source. Sports on ESPN, weather on NWS/NOAA, crypto prices on Coinbase. The source is always disclosed.
- ▸News settles by majority. NYT, WSJ, Reuters, AP, and BBC each give an independent verdict. A majority has to agree before the market settles.
Majority rule
SETTLING“Did the bill pass the Senate before July 1?”
4 of 5 agree: settles YES
If there is no majority, the market stays SETTLING and Thassa checks again later.
04 / Creator economics
Your markets pay you.
Takers pay a small fee on each trade, at most 1.75¢ per share. Makers pay nothing. Of every fee collected, 10% goes to the market’s creator and 10% to the post that routed the trade. If your post sends people to a busy market, you get paid for it.
Creating a market is free. You just need a $1 minimum opening bet. Settlement costs 5¢ and withdrawals cost a flat 10¢. That is the entire fee schedule.
Where every taker fee goes
Free
market creation
$0.05
settlement trigger
$0.10
flat withdrawal
05 / Builders
One account. App and API.
Everything the app can do, your code can do: same accounts, same order book, same one-signature orders. Create a key in the app, stream live prices over WebSocket, and place orders from code.
$ curl -G "$THASSA_API/trade-api/v1/markets" \
-d status=OPEN -d limit=1
{
"markets": [
{
"id": "42",
"question": "Will it rain in SF Saturday?",
"status": "OPEN",
"yes_price_cents": 12,
"volume": "2730000000"
}
],
"next_cursor": "eyJvZmZzZXQiOjF9"
}