How Meridian works

A simple yes-or-no question about a stock, decided by the end of the day. For example: “Will Apple close at or above $210 today?” You buy Yes if you think it will, or No if you think it won't. Each contract pays out $1.00 if your side is right, and nothing if it's wrong.

Because the price is the odds. A Yes contract trading at 65¢ means the market thinks there's roughly a 65% chance it happens. If you're right, every contract becomes worth $1.00 — so paying 65¢ to maybe win $1.00 is the market pricing in those odds. Cheaper contracts are longer shots; more expensive ones are closer to a sure thing.

They last one trading day. Every contract is created in the morning and settles at the 4:00 PM ET closing bell the same day. There's nothing to hold overnight and no expiration weeks away to track — you find out if you won the moment the market closes.

Because together they fund exactly one $1.00 payout. Exactly one side wins, so a Yes at 60¢ and a No at 40¢ add up to the dollar that gets paid to whoever is right. It also means buying No is the same bet as selling Yes — just from the other direction.

Yes — you connect a Solana wallet (a free browser app like Phantom) to trade. Meridian is non-custodial, which means we never hold your money. Your wallet signs each action, and the on-chain program is the only thing that can move funds — by rules anyone can inspect. There's no account to open and no balance sitting with an operator who could lose it or freeze it.

USDC is a digital dollar — a “stablecoin” that's designed to always be worth $1. It's the money you put up to buy contracts and the money you're paid in when you win. Pricing everything in dollars is what lets a contract simply pay $1.00 to the winning side.

No. This app is running on Solana devnet, a test network. The USDC here is free test money with no real-world value — perfect for learning how the markets work without risking a cent. Everything behaves exactly like the real thing; only the dollars are play money.

After the 4:00 PM settlement, your winning contracts are each worth $1.00, which you redeem back into USDC in your wallet. The funds were in your own wallet the whole time — cashing out is just converting settled contracts back to dollars, with no withdrawal request to an operator.

There's no Meridian commission on your trades. The only cost is Solana's network fee for each transaction — typically a tiny fraction of a cent — which goes to the network, not to us. Keep a small amount of SOL (Solana's native token) in your wallet to cover those fees.

Tap a side in the Yes / No bar above the chart — or click any price in the order book — and a ticket opens where you set the amount and choose market or limit. Every ticket offers the same four actions: Buy Yes, Sell Yes, Buy No, and Sell No. Pick the side you believe in and how much, and you're trading. Behind the scenes those four actions all feed one shared market, so you always get the best available price for what you asked for — you don't need to understand the plumbing to use it.

Through an order book — the same idea a stock exchange uses. Buyers and sellers post the prices they'll accept, and when a buy and a sell line up, they trade. Better-priced orders go first, and ties are broken by who was there first. It all happens on-chain, in the open, with no middleman deciding who fills.

Then your order simply waits in the order book until someone does — or until you cancel it. If you want to trade right now, match an order that's already posted at its price. If you're patient, post your own price and wait for a taker. Quieter markets can take longer to fill, or may not fill at all.

Yes. You're never locked in until 4:00 PM. As long as someone will trade with you, you can sell your position any time the market is open — to lock in a profit, cut a loss, or just step aside. Whatever you don't sell rides to settlement and pays out based on the closing price.

The “Magnificent Seven” — the megacap tech names that drive much of the market: Apple, Microsoft, Nvidia, Amazon, Alphabet (Google), Meta, and Tesla. They're heavily traded and closely watched, which keeps the daily questions interesting.

Each morning Meridian sets a few price lines around where each stock is trading — some a little above, some a little below. That gives you a range of questions to take a side on, from “almost certainly yes” to “long shot,” instead of a single coin-flip. The line in a question (like “$210”) is that strike.

Nobody calls it — it's automatic. At the close, the program reads the official closing price from an on-chain price oracle (a trusted, tamper-resistant price feed) and pays out accordingly. There's no human judge, no dispute window, and no waiting: if the stock closed at or above the line, Yes wins; otherwise No wins.