Contracts

Every contract Split's options use on Robinhood Chain (chain id 4663). Values below were read on chain at block 88,582,788 (14 October 2026). Explorer: robinhoodchain.blockscout.com.

Pools can be replaced. The app reads the current set from its market registry (GET https://split.markets/api/markets). Check an address there before sending funds.

Live markets

Market	Pool (CashSettledPool)	Price feed (Chainlink proxy)	maxStaleness	settleDelay
BTC daily	0x8b71c6a373cba2244473aa780eecd92188abeb4a	0xa2c5184bF03d373Dc9dE4876eb4Bce595B460251 BTC / USD	28,800 s (8 h)	60 s
ETH daily	0xad9fc0d73e907dfe1fa14537e62079d8586485e1	0x78F3556b67E17Df817D51Ef5a990cDaF09E8d3A9 ETH / USD	14,400 s (4 h)	60 s

State at the read:

	BTC	ETH
Phase	Trading	Trading
Epoch	27	29
Maturity	2026-10-15 00:00 UTC	2026-10-15 00:00 UTC
Free USDG	3,299.74	1,983.38
Committed USDG	58.04	0
Allocation headroom	2,628.18	1,586.71
Bands this epoch	8 call spreads	8 call spreads

Parameters common to every pool

Getter	Value	Meaning
usdg()	USDG	Collateral and payout token
pricer()	0x7cE46DCDC49D0903ce6100dFd0198f5745490714	Address whose EIP-712 signature the pool accepts for quotes and NAV. Owner can rotate it with setPricer.
feeBps	0	Protocol fee on premium and sell proceeds. Contract maximum is 500.
maxAllocBps	8000	At most 80% of pool value (free + committed USDG) can back open series.
MAX_STRIKES	8	Bands per side per epoch
twapRounds	1	Settlement uses the latest round only
maxDeviationBps	1000	Only applies when twapRounds > 1, so inactive here
sequencerUptimeFeed	0x0	No sequencer check
requireUniqueNonce	false	Quote nonces are not burned
owner()	0x5c97458BC2F8E6EF2336C8B34a713993F78D7d63	Opens rounds (startEpoch). Can rotate the pricer, fee recipient and owner, change the allocation cap, and toggle nonce burning. Cannot withdraw collateral.

oracle, maxStaleness, settleDelay, twapRounds, maxDeviationBps and the sequencer settings are immutable. Changing them means deploying a new pool.

Shared contracts

Contract	Address	Notes
USDG (Global Dollar)	0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168	6 decimals. EIP-1967 proxy.
CashSettledVaultFactory	0x8b2af014df363b03b2a42C86230Cc25a92784248	Deploys one vault clone per band
Vault implementation	0x2F69E177FA86B084d6946aB6f48d5940554Af728	CashSettledVault, cloned with EIP-1167
Leg token implementation	0xbA04dC1084E52a816882Ff607c1e2c23d3199d6a	ERC-20 leg, cloned twice per band

Position tokens

Each band is its own CashSettledVault clone with two ERC-20 legs (18 decimals):

• N (csN, "CashSettled N"): the Up leg. Pays min(max(S − K, 0), W).
• P: the writer leg. Pays W − N. The app sells it as Down through buyDown / sellDown.

A position is identified by the pool, the epoch and the series index (callVaultAt(epoch, id)). New vault and leg addresses are created every epoch. Read them from the pool, not from this page.

Vault getters: strike(), cap(), capPayout() (= W), maturity(), N(), P(), settled(), settlePrice(), intrinsicPerUnit(). Prices and widths are USDG (6 decimals) per 1e18 of the leg, i.e. per one unit of the underlying.

Anyone can call mint(amount) on a vault before maturity: it locks ceil(amount × W / 1e18) USDG and mints amount of both N and P. redeemPair(amount) burns both and returns the USDG.

Current BTC epoch 27 bands (strike to cap, USD):

#	Vault	Band	Width
0	0xe104…95d1	79,360.31 to 81,012.35	1,652.04
1	0x824b…367D	81,012.35 to 82,192.37	1,180.03
2	0x293b…95BF	82,192.37 to 83,035.25	842.88
3	0x4B83…1C8F	83,035.25 to 83,637.30	602.05
4	0xCB3F…267E	83,637.30 to 84,239.35	602.05
5	0x0206…6E6b	84,239.35 to 85,082.23	842.88
6	0xE9D5…6dd4	85,082.23 to 86,262.25	1,180.03
7	0x7030…D54F	86,262.25 to 87,914.29	1,652.04

Each band starts at the previous band's cap. Bands are narrowest at the centre.

Price feeds

Both live feeds are Chainlink DualAggregator 1.0.0 behind a proxy, 8 decimals.

Feed	Proxy	Aggregator	Deviation	Heartbeat
BTC / USD	0xa2c5…0251	0xc584…eEC	0.5%	24 h
ETH / USD	0x78F3…3A9	0x6091…2721	0.5%	24 h

Deviation threshold and heartbeat are feed configuration and are not readable on chain. The values above match the feeds' round history (getRoundData).

Settlement

1. After epochMaturity + settleDelay, anyone can call closeEpoch() on the pool. It settles every band, claims the pool's own legs back into free USDG, emits EpochClosed, and returns the pool to Idle.
2. settle() on each vault reads latestRoundData() once. It requires a positive answer, a complete round (answeredInRound ≥ roundId) and block.timestamp − updatedAt ≤ maxStaleness. If any check fails it reverts with no state change, and can be called again.
3. Holders claim with claimNAndWithdraw(amount, to) (Up) or claimPAndWithdraw(amount, to) (Down). Both call settleIfNeeded() first. There is no claim deadline.

Events to index:

Contract	Events
Pool	EpochStarted, BoughtCall, BoughtDown, SoldCall, SoldDown, EpochClosed, Deposit, Redeem, PricerSet, CapSet
Vault	Mint, RedeemPair, Settled(settlePrice, intrinsicPerUnit, capPayout), ClaimN, ClaimP, ClaimUsdc

V2 engine

Contract	Address	Status
OptionEngineV2	0x6340ca58b02113c3c8de99d106c9465d8ffd47fe	Series keyed by a hash of their terms. Permissionless issue(terms, amount) locks full collateral and mints both legs.
SplitPositions1155	0x1f0a2fb44342c3dc43e7461e820c6d025b1f17ef	ERC-1155 positions for the V2 engine
ExchangeV2	0x8e83d989ddb5a1fe3a487c97bea5f02a36ab5766	Signed-quote exchange for V2 positions

The V2 engine settles on the last oracle round at or before expiry. It is deployed on Robinhood Chain; the app's markets trade on the V1 pools above.

Other deployed pools

Same CashSettledPool code, no open round: AAPL 0x5853…ee43, ORCL 0xbce8…1480, SPCX 0x6a3f…c020, NVDA 0x60b7…5aec, QQQ 0xd054…cf9c, SPY 0x703a…7c7c, SPY FOMC 0x540c…97c3, DELL 0xcbc2…b73f.