What price will Bitcoin hit on May 21?

Platform comparison

Active sub-markets

Market context

Bitcoin’s intraday level on 21 May is being priced on Polymarket via USDC collateral on Polygon, with conditional tokens settling against the market’s reference rule at expiry. With the crowd-implied probability at 0% YES, the market is effectively saying the current spot range sits below every listed strike bucket the contract offers for this window, so any move into a higher band before the settlement cut-off would have to come from a sharp late repricing rather than a slow drift.

That zero reading should be read against the recent range in comparable Bitcoin forecasts and trading levels. CoinCodex had BTC around the high-$70,000s to mid-$80,000s over the next few sessions, while Binance’s forecast sat near $77,700 for 21 May and Robinhood’s related market had BTC above $77,800 in the early hours of the day. Those are not settlement outcomes for this contract, but they show that consensus models and venue prices have clustered around the high-$70,000s, leaving limited room for a step-change unless spot breaks materially higher.

A trader watching this market should focus on the final US benchmark prints, any exchange-driven volatility, and macro headlines that can move BTC within hours. The key dependency is the CF Benchmarks real-time index used for resolution, so liquidity matters most in the last part of the window. Recent third-party forecasts have also cited mixed technicals, with bearish indicator skews even as some short-term paths pointed higher, which is a reminder that the contract can reprice quickly if Bitcoin pushes through nearby resistance before the 04:00 UTC settlement cutoff.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track What price will Bitcoin hit on May 21? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.