PearnMirrored Polymarket markets
Most testnet markets ask a live Polymarket question and resolve the way Polymarket settles it.
Most markets on the testnet deployment mirror a binary Yes/No market on Polymarket: the same question, bet here with stNEAR on Pearn's no-loss terms. Betting closes at Polymarket's end date.
Which markets
scripts/polymarket-catalog.mjs picks the top open Polymarket markets by volume and writes them to packages/catalog/markets.json. It only takes markets that:
- have outcomes of exactly
["Yes", "No"]; - end between 3 days from now and the end of 2027;
- have a Yes price between 4% and 96%.
It takes at most one market per event and two per topic, and skips death and violence markets. Each market's image is downloaded once and served from Pearn's own origin.
scripts/polymarket-seed.mjs creates the new entries with createMarket through NEAR. The keeper's wallet is the resolver, and the script checks every id against the chain before saving it.
Resolution
The keeper (.github/workflows/keeper.yml, every 12 h) first syncs the rate, then runs scripts/polymarket-resolve.mjs. The script only acts on a closed market once the oracle has a rate read after its close.
For each such market, it reads gamma-api.polymarket.com/markets/slug/<slug> and checks that the conditionId is unchanged. It waits until the market is closed and UMA's status is resolved; a proposed or disputed answer waits for the next run. Then it calls resolve:
| Polymarket settles | Pearn outcome |
|---|---|
| Yes at 1 | Yes |
| No at 1 | No |
| Anything else (a 50-50 split) | Invalid: everyone gets their principal back |
The 24 h challenge window still applies: the guardian can turn a wrong report into Invalid. If Polymarket takes longer than 7 days after close, anyone can void the market, and everyone gets their principal back.
The oracle for these markets is Polymarket (UMA) plus Pearn's keeper. The keeper reports what Polymarket published; nobody can recompute that from chain data. On mainnet the resolver should be a DAO or a verifiable bridge of the UMA result, not one key.
In the app
Cards show Polymarket's live Yes price as the chance and Polymarket's volume. The pot and the stakes are Pearn's own. The browser reads those numbers from Gamma's public API; the market page links to the Polymarket market. Markets created on Pearn show the YES share of their stake instead.