What Halley is – an open prediction market network

Prediction markets turn questions about real‑world events into tradeable contracts. Participants buy and sell outcome shares whose prices reflect the crowd’s live estimate of probability, and winning shares redeem at full value when the event resolves.

Halley is an open, non‑custodial prediction DEX on BNB Smart Chain built around that idea. It is settlement infrastructure for event markets: anyone can open a market in about sixty seconds for roughly a dollar, define clear resolution criteria, and let participants take positions directly from their own wallets. Trading is free at protocol level, positions are ERC‑1155 outcome shares held in self‑custody, and 80% of each market’s resolution fee flows back to the market creator.

Instead of a central platform deciding what’s “allowed” and keeping most of the economics, Halley pushes those decisions and that upside out to the edges of the network. The protocol runs on immutable smart contracts on BNB Chain, audited and deployed so that the core rules cannot move after launch.

How Halley event markets work for participants

Every Halley market starts with a question about what happens next:

• Will a specific chain lead DEX volume in a given quarter?
• Will a particular token flip another in market cap by a deadline?
• Which event lands first across sport, crypto, and culture?

The market creator defines the question, sets between 2 and 10 mutually exclusive outcomes, and writes resolution criteria that point to public, verifiable data sources.

Participants then connect a BNB Chain wallet and take positions on the outcomes. Each position is an outcome share: a token that will be worth 1 at settlement if its outcome is correct and 0 if not, just as on other decentralized prediction markets where binary contracts pay out $1 on the correct event and $0 otherwise.

Prices between 0 and 1 read directly as implied probabilities. A share trading at 0.35 suggests the crowd currently assigns roughly a 35% chance to that outcome. As information changes, so do the prices. Participants can adjust or close positions at any time while the market is open, and when settlement arrives, correct outcome shares redeem at their full settlement value through the protocol’s smart contracts.

The key structural points for participants:

• Non-custodial trading: funds remain under your control, while smart contracts hold only the assets required to support open positions and settlement. 
• On‑chain central limit order book: prices are set by real buyers and sellers in each outcome’s order book, with no house or bookmaker taking the other side.
• Transparent settlement: all trades, positions, and settlement operations are on‑chain and publicly verifiable.

No part of this process relies on gambling vocabulary or a sportsbook model. It is an on‑chain market infrastructure for forecasting and settling event outcomes.

The economics of the resolution fee

Halley’s only protocol fee is the resolution fee, charged once at settlement on the settlement gain of the correct outcome, not on the face value of all positions.

Every correct outcome share is always worth 1 at settlement. The market price for that outcome at close might be p. The settlement gain is 1 - p. For illustration purposes, the fee in this example is fixed at 5% and is applied only to that settlement gain.

Example structure, simplified from Halley’s own documentation:

• Five‑outcome market: “Which chain leads DEX volume in Q4 2027?”
• Creator sets a 5% resolution fee.
• At market close, Base is priced at 0.15 and resolves as correct.

Settlement gain: 1.00 - 0.15 = 0.85.
Fee base: 0.85.
Effective fee: 0.85 \times 5\% = 0.0425, or 4.25% of face value.

Each correct share redeems at 1.00 - 0.0425 = 0.9575. On a $100,000 market, total resolution fees are $4,250; the creator receives 80% ($3,400), the protocol treasury 20% ($850).

If the favourite resolved instead at 0.35, the gain would be 0.65; the effective fee falls to 3.25%, and the creator’s share of fees decreases accordingly. This means that lower-priced outcomes generate a larger settlement gain when they resolve as correct, while higher-priced outcomes generate a smaller one. 

Throughout, trading itself remains free: there is no protocol fee on opening or closing positions, only a resolution fee applied at settlement to the gain on correct outcome shares.

Why Halley is different from curated prediction venues

Traditional prediction platforms operate as centralized venues. A company decides which markets are listed, holds user funds, sets fee structures, and can change rules or close markets as it sees fit.

Halley is designed as the opposite shape:

• Permissionless listing: any wallet can open a market without applications, approvals, or gatekeepers. The creator chooses the question, the outcomes, and the resolution criteria.
• No administrative overrides: core contracts are immutable on BNB Smart Chain; the rule set governing settlement, fee splits, and outcome shares cannot be silently rewritten after deployment.
• Creator‑aligned economics: 80% of the resolution fee flows to the market creator; 20% to the protocol treasury. There is no central operator sitting between the creator and their audience to capture most of the upside.

Curated venues inevitably narrow what they host as regulatory and editorial pressures grow: some topics are judged too sensitive, others too hard to resolve, others commercially inconvenient. On Halley, the question of what exists as a market is a creator decision constrained only by clear, public resolution sources and on‑chain rules – not a closed‑door editorial process.

Mash‑up markets and multi‑domain event markets

Most prediction markets have historically been built around single‑domain, single‑event structures: a sports market in the sports section, a crypto market in the crypto section, and politics behind its own wall.

Halley’s architecture allows something different: the mash‑up market.

A mash‑up market is one event market that combines outcomes from unrelated domains in a single question, with a single order book and a single on‑chain settlement. For example:

What happens first this Saturday – Real Madrid scores, Bitcoin crosses $100,000, or Taylor Swift posts on Instagram?

All three outcomes live in one market. Participants take positions on whichever outcome they believe will arrive first; the order book aggregates probabilities across sport, crypto, and culture, and prices across all outcomes still sum to approximately 1.

Because Halley treats outcomes as arbitrary labelled options within a single market and settles on public records regardless of domain, the protocol does not need separate pipelines for each category. This is structurally difficult for curated venues that route sports, crypto, and cultural events through their own siloed compliance and resolution processes.

For creators, mash‑up markets do three things:

• Pull multiple audiences into one deep book (football fans, traders, pop‑culture followers).
• Turn the choice of outcomes itself into a creative act – the juxtaposition is the take.
• Generate a single resolution fee stream where 80% of that fee goes to the creator who designed the market.

All of this remains framed in prediction‑and‑market terms, not in casino language.

For creators – turning audience debates into markets

If you already run a newsletter, podcast, channel, or community, your audience is likely arguing about what happens next every week: which chain wins a metric, how a protocol upgrade will land, which event plays out first in a narrative.

On Halley, those debates become markets:

• You define the question your crowd is already discussing.
• You set 2–10 outcomes and write resolution criteria pointing to public data sources.
• You choose a resolution fee between 1% and 10%.
• You open the market in about sixty seconds for few dollars.

Your community then takes positions on the outcomes. The people convinced of one path take one side; the people convinced of another take the other. The argument that was running in comments or Discord effectively becomes the order book. You are not required to put up liquidity or take a position yourself – you simply open the market and point your crowd at it.

When the event closes and the correct outcome is settled, 80% of the resolution fee on the settlement gain goes to you as the market creator. The protocol receives the remaining 20% to keep the infrastructure running.

Because the resolution fee is tied to how much the crowd mis‑priced the outcome at close, the markets where your call was most contrarian – the ones that captured real informational surprise – are precisely the ones that pay you most.

Throughout, the language remains creator‑ and protocol‑focused: markets, positions, settlement, resolution fees, return potential. There is no need to frame any of this as gambling or as a betting venue.

How event resolution and governance work

Every prediction market must ultimately answer the same question: who confirms the correct outcome, and how?

Halley’s resolution process is deliberately kept in the open:

• When the event closes, independent Market Managers verify and announce the correct outcome based on the resolution criteria the creator set at market creation.
• If Market Managers cannot reach a result, community resolution opens. Community members can announce an outcome by posting the Halley Market token as collateral, tying participation in resolution to economic skin in the game.
• Resolution decisions and fee calculations are executed by immutable smart contracts on BNB Smart Chain; they are not subject to discretionary overrides.

This keeps the resolution mechanism aligned with how decentralized prediction markets generally handle outcome verification—using public data sources and on‑chain logic instead of human arbiters behind a desk—while adding a two‑stage structure (Managers, then community) designed around transparency and verifiable sources.

How to open your first Halley market

For someone new to Halley, the process looks like this:

From that point on, the order book, settlement, and fee logic run entirely in code. Your role is to define good questions, bring your audience, and let Halley’s open prediction infrastructure do the rest.

Predict the return!

© qolumnist