RainChain Phase 0 — in development

Rain Chain / Token

RAIN secures the chain and burns with use.

RAIN is native on Rain Chain and moves to Arbitrum One by burn-and-mint, with one global supply. It pays for gas, secures consensus through staking, and bonds resolution.

Utility

What RAIN does on Rain Chain

Gas

RainEVM gas is paid in RAIN. The EIP-1559 base fee is burned; the priority fee goes to the proposer. Trading on RainCore is gasless.

Staking & security

Validators self-bond RAIN and delegators stake to them. Consensus voting power is stake-weighted.

Resolution bonds

Proposals, disputes and appeals are bonded in RAIN; losing bonds are half burned, half paid to the winning challenger.

Settlement & governance

Settlement token for RAIN-denominated markets and the asset that votes on parameter changes. Not used as leverage margin in v1.

Supply

One global supply across two chains

1.142TRAIN total supply (S0)Read on Arbitrum One, 6 Oct 2026
114.24BStaking reserve — 10% of S0Released over 8 years
0.5%Protocol inflation, years 1–4Of current supply
1.0%Protocol inflation from year 5Permanent

S0 = 1,142,408,474,514 RAIN (18 decimals). Arbitrum supply + Rain Chain supply always equals the global supply: S(t) = S0 + protocol inflation − burns. Validators check this invariant at every checkpoint; any breach pauses RAIN bridging automatically.

  • Staking Rewards Reserve: 114.24B RAIN of existing supply moves into a genesis module account and is released to stakers per block. Releases don't raise total supply.
  • Protocol inflation: 0.50% per year in years 1–4, 1.00% per year from year 5, minted per block. The step-up replaces the declining reserve so the security budget never falls off a cliff.
  • Later (Phase 3): governance may enable a ±0.25 pp yearly adjustment targeting a 50% staking ratio. Until then inflation is fixed.

Issuance schedule

Rewards to stakers, by year

Reserve release (existing tokens) plus newly minted inflation, in billions of RAIN — before any burn.

Reserve release (existing supply)Protocol inflation (newly minted)
Source: specification v0.2, Table T1. From year 9 rewards come from inflation and fees only.
YearReserve release (% S0)Inflation (% supply)New supply mintedSupply end of year
12.00%0.50%5.71B1,148.12B
21.75%0.50%5.74B1,153.86B
31.50%0.50%5.77B1,159.63B
41.25%0.50%5.80B1,165.43B
51.00%1.00%11.65B1,177.08B
61.00%1.00%11.77B1,188.85B
70.75%1.00%11.89B1,200.74B
80.75%1.00%12.01B1,212.75B
90.00%1.00%12.13B1,224.88B
100.00%1.00%12.25B1,237.13B

Supply figures exclude burns.

Fees & burn

Usage removes RAIN from supply

Burn sources:

  • Buy-and-burn: 35% of protocol trading fees buy RAIN on the native RAIN/USDT book via TWAP and burn it.
  • EVM base fees: all RainEVM base fees are burned.
  • Lost bonds and slashing: half of every losing resolution bond and all slashed stake are burned.
  • Listing auctions (Phase 3): 100% of spot-listing auction proceeds are burned.

The specification models year-1 net inflation at 0.18%–0.50% depending on trading volume (scenarios from $50M to $5B per month). These are model scenarios, not forecasts.

Bridge

Burn-and-mint for RAIN, lockbox for stablecoins

Depositing RAIN burns it on Arbitrum and mints the same amount on Rain Chain. Withdrawing burns it on Rain Chain and, after the withdrawal delay, mints it on Arbitrum through a bridge-only function. No RAIN sits in a lockbox, so there is no RAIN honeypot.

Bridge between Arbitrum One and Rain Chain RAIN deposits burn on Arbitrum and mint on Rain Chain; withdrawals burn on Rain Chain and mint on Arbitrum through a capped bridge-only mint. USDT and USDC are held in a lockbox on Arbitrum. Withdrawals need signatures from two thirds of validator stake, wait a size-based delay, and stay under hourly caps. Guardians can lock but never move funds. ARBITRUM ONE RAIN token (proxy) deposit: burnFrom withdraw: bridgeMint cap 0.1% S0/h · 0.5%/24h Lockbox holds USDT · USDC out ≤ 5%/h · 20%/24h beta deposit cap $25M 7-day timelocked upgrades RAIN CHAIN Native RAIN mint on deposit burn on withdrawal supply invariant checked Validator set ≥ 2/3 stake signs withdrawals in vote extensions; invalid signature = slashed deposit withdraw + delay Delay by size < $10k3 min$10k–250k30 min$250k–2M4 h> $2M24 h
Bridge flows between Arbitrum One and Rain Chain.
  • Token upgrade: the Arbitrum RAIN implementation gains a bridgeMint callable only by the bridge, with balances and ERC-20 behaviour unchanged. It must be audited, run behind a ≥ 7-day timelock, and announced to integrators in advance.
  • Mint caps in the token itself: 0.1% of S0 per hour and 0.5% per 24 h at launch, so even a compromised bridge cannot mint unbounded RAIN.
  • Withdrawals: ≥ 2/3 of validator stake must sign, then a size-based delay from 3 minutes to 24 hours applies.
  • Stablecoins: USDT and USDC sit in a lockbox with outflow caps of 5% per hour and 20% per 24 h, and a $25M deposit cap during beta.

Bridge details for developers →

Staking yield

Yield depends on how much is staked

Year-1 gross issuance to stakers is about 2.5% of supply. The APR each staker sees depends on the staking ratio — and validators keep commission on delegated rewards. Token-denominated, before commission, excluding the stablecoin fee share:

Staking ratioBonded RAINAPR year 1APR year 5APR year 9
10%114.24B24.88%19.61%9.90%
30%342.72B8.29%6.54%3.30%
50%571.20B4.98%3.92%1.98%
70%799.69B3.55%2.80%1.41%
Model, not a promiseThese figures come from the specification's issuance model. Actual yield depends on the staking ratio, validator commission and uptime. Nothing on this site is an offer or a price forecast.

Stake or run a validator