Developer Overview

Everything on veto.fun is on-chain and permissionlessly integrable. You can build trading bots, indexers, dashboards, or entire alternative frontends. No API key required.

Two ways to integrate

TypeScript SDK

@hoodstudio/hoodstar-sdk: typed reads, writes, exact client-side quote math, and event streaming on top of viem. The fastest way to build.

Raw contracts

Call the launchpad directly from Solidity, Foundry scripts, or any web3 library. Full function and error reference.

Robinhood Chain

	Mainnet	Testnet
Chain ID	`4663`	`46630`
RPC	`https://rpc.mainnet.chain.robinhood.com`	`https://rpc.testnet.chain.robinhood.com`
Explorer	robinhoodchain.blockscout.com	robinhoodchain-testnet.blockscout.com
Gas token	ETH (18 decimals)	Testnet ETH (faucet)

Robinhood Chain is an Arbitrum Orbit L2. Two practical consequences:

Blocks are fast and reorgs are effectively nonexistent, so confirmation counts of 0–1 are fine.
The public RPC is HTTP only (no eth_subscribe websocket). The SDK’s event layer is built around chunked eth_getLogs polling for exactly this reason; for websockets you need a paid RPC provider.

Architecture

Three contracts run the whole protocol:

Contract	Role
VetoDotFun	Singleton: token factory, all bonding curves, fee ledger, and Uniswap migrator in one contract.
HoodToken	Per-launch ERC-20 (+ EIP-2612). Fixed 1B supply, no admin functions, immutable `metadataURI`.
FeeLocker	Immutable, ownerless vault holding every graduated LP position forever; splits collected swap fees creator/treasury at the token’s launch-time snapshot (30/70 under the current config).

Only the launchpad address is needed to integrate. The FeeLocker, treasury, WETH, and Uniswap position manager are all discoverable from it on-chain.

Contract addresses

Live on mainnet since block 9,824,773 (2026-07-14), source-verified on Blockscout:

Contract	Mainnet (4663)
VetoDotFun	`0x152172137fa870a51DFde25a0dFc0bE9ad4dEE5A`
FeeLocker	`0x98f721ca716214c425DCF9D7c098A054869aa85E`

There is no testnet deployment: Uniswap v3 is not deployed on Robinhood Chain testnet, which the protocol depends on for graduation. Develop against a local Anvil fork of mainnet instead.

Canonical Robinhood Chain infrastructure the protocol builds on:

Contract	Address
Uniswap v3 Factory	`0x1f7d7550B1b028f7571E69A784071F0205FD2EfA`
Uniswap v3 NonfungiblePositionManager	`0x73991a25C818Bf1f1128dEAaB1492D45638DE0D3`
Uniswap SwapRouter02	`0xCaf681a66D020601342297493863E78C959E5cb2`
WETH	`0x0Bd7D308f8E1639FAb988df18A8011f41EAcAD73`

Key protocol constants

TOTAL_SUPPLY     = 1_000_000_000 × 1e18   // per token
SALE_SUPPLY      =   793_100_000 × 1e18   // sold on the curve
POOL_SUPPLY      =   206_900_000 × 1e18   // reserved for Uniswap LP
VIRTUAL_TOKEN_0  = 1_073_000_000 × 1e18   // initial virtual token reserve
virtualEth0      = 1.6 ETH                // initial virtual ETH reserve (deploy parameter)
Trade fee        = 100 bps (70 protocol / 30 creator)  // current global config
LP fee split     = 3000 bps creator share              // current global config
Creation fee     = 0.001 ETH flat                      // current global config
Uniswap pool     = 1% fee tier (10000), full-range position

The three fee values form the global, owner-tunable config (hard-capped at 5% trade fee / 0.1 ETH creation fee). Each token snapshots the config at createToken: read a token’s own fees from its CurveState, not from the global config, which only tells you what future launches will pay.

​Two ways to integrate

TypeScript SDK

Raw contracts

​Robinhood Chain

​Architecture

​Contract addresses

​Key protocol constants

Two ways to integrate

Robinhood Chain

Architecture

Contract addresses

Key protocol constants