The infrastructure layer for prediction markets.
Linesetter gives new and growing exchanges the building blocks to run a market end to end: creation, settlement, audit, liquidity, and the data underneath. Adopt the whole stack or just the piece you're missing.
- initEngine online. Seeding two-sided liquidity at fair value.
- initPriors loaded from base rates + futures-implied path.
- initRisk limits armed: max inventory 2,000 · stop at -$3,000.
We pressure-tested Linesetter against a month of live prediction markets, so source recommendations and readiness scores reflect how markets actually settle, not guesses.
Volume is estimated dollars traded (contracts x trade price), not $1 notional. Excludes 3 parlay-permutation series (13,384,384 auto-generated combination markets, $10B notional but only $323M actually traded) tracked separately.
Modular infrastructure for every market
These are the modules teams reach for first, but the platform spans the whole market lifecycle. Take the full stack or a single component; if a market needs infrastructure we haven't listed, we build it.
Market creation
→Turn a question into a well-formed market: structure, resolution rules, and the right settlement sources, informed by how comparable live markets actually resolve.
Settlement
→Resolve markets against authoritative sources with automated observation, cross-source agreement checks, and sub-second settlement where the data is structured.
Audit log
→Every settlement ships with a human-readable trail: what was checked, where, when, the exact evidence, and a signed, replayable ledger entry.
Market making
→Seed and sustain liquidity with a proprietary agentic market-making engine that prices fair value from live signals, manages inventory, and adapts spreads in real time.
Whatever your market needs next
Source intelligence, pricing & oracle feeds, risk and position limits, compliance and reporting, distribution and embeddable markets. If a market needs it, we'll build it.
From question to signed settlement
Specify the question, structure, and close time. We draft resolution rules from category-tested templates.
We propose settlement sources ranked by real precedent, each flagged for access, reliability, and automatability.
At expiration we observe the source, cross-check across redundant feeds, and compute the outcome.
A signed, human-readable audit log explains exactly how the market resolved, for traders and regulators.
Know how every category settles
We mapped which sources real markets resolve against, and whether each is free to read, metered, or paywalled. It's the data behind every recommendation.
Mentions markets: settling the unstructured
How “will they say it?” markets resolve off live broadcast feeds and official channels, and what that means for automated settlement.
Launch your next market on Linesetter
We're onboarding a first cohort of exchanges and operators. Tell us what you're building and we'll set you up with sandbox credentials.
- ✓API-first market creation & settlement
- ✓Source recommendations from real precedent
- ✓Signed, human-readable audit logs
- ✓Optional automated market making