How probl.fun works.
probl.fun is an institutional-grade, multi-chain liquidity terminal and bonding curve launchpad built native to Arc Network (Circle’s USDC-native Layer-1) and cross-connected to Robinhood Chain (RH 4663), Solana, Base, and BNB Chain.
The rules described in this specification are not web policies or off-chain database promises. They are immutable smart contract constraints baked into the factory router and bonding curve mathematics. Liquidity locks, anti-sniper decay formulas, and fee distributions are enforced deterministically on-chain from the very first block.
Atomic Launch & Milestone Graduation.
Launching a token requires a single Web3 signature. The creator specifies a Name, Symbol, Description, and Image URI (IPFS). In that single transaction, the factory contract:
- Deploys the fixed 1,000,000,000 ERC-20 token contract.
- Seeds the entire supply into the on-chain bonding curve router.
- Opens trading publicly at ~5,000 USDC baseline FDV. Zero private sales, zero pre-allocations.
When 79.31% of the circulating supply has been purchased along the bonding curve, the token reaches Graduation. This is a milestone of liquidity sufficiency, not a risky bridge migration. The accumulated USDC reserve is automatically paired with the remaining supply, deposited into a Uniswap V4 / Arc AMM pool, and the LP ownership token is burned permanently to 0x000000000000000000000000000000000000dEaD.
The 3-Second Exponential Decay Anti-Snipe Tax.
Automated MEV bots that front-run human traders in the opening block of a launch extract predatory profits. To completely eliminate the economic incentive of bot front-running, probl.fun enforces a mathematical Exponential Decay Snipe Tax on all buy transactions for the first 3 seconds:
| TIME AFTER LAUNCH ($t$) | BUY TAX RATE | BOT IMPACT & MECHANISM |
|---|---|---|
| 0.0s (Block 0) | 99.00% | Same-second bot snipes lose 99% of principal to liquidity. Zero profit edge. |
| 1.0s | 24.81% | Decay steepens rapidly as second block arrives. |
| 2.0s | 5.19% | Tax decays to nominal fraction. |
| 3.0s and beyond | 0.00% | Anti-snipe window expires permanently. Only normal 1.0% swap fee applies. |
*Important note: Selling is NEVER taxed. The creator's optional launch buy is exempt because it executes in the genesis block before any market exists.
Sustainable 20% Fee Rebates & Real Yield.
Every swap on probl.fun incurs a uniform 1.0% protocol transaction fee. Instead of concentrating fees into dev team pockets or printing inflationary governance tokens, the protocol recycles 100% of collected fees back into the ecosystem:
Automatically converted into liquidity and burned permanently, accelerating token progression towards graduation.
Directly accrued to the trader's connected wallet balance. Claimable on-chain in real-time as native USDC.
Paid to whoever referred the trader (25% share of fee). Unclaimed balances accrue indefinitely.
Funds RPC blockstream infrastructure, WebSocket telemetry servers, and keeper network gas subsidies.
Network Endpoints & Official Parameters.
| NETWORK | CHAIN ID | GAS CURRENCY | OFFICIAL RPC ENDPOINT | EXPLORER |
|---|---|---|---|---|
| Arc Network | 5042 / 5042002 | USDC (18 Decimals) | https://rpc.testnet.arc.io | arcscan.app |
| Robinhood Chain | 4663 | ETH | https://rpc.mainnet.chain.robinhood.com | robinscan.io |
| Solana | Mainnet-Beta | SOL | https://api.mainnet-beta.solana.com | solscan.io |
| Base L2 | 8453 | ETH | https://mainnet.base.org | basescan.org |
| BNB Chain | 56 | BNB | https://bsc-dataseed.binance.org | bscscan.com |
Cryptographic Risk & Non-Custodial Status.
probl.fun is an autonomous software interface connecting users to public blockchain smart contracts. The interface is strictly non-custodial and never holds user private keys or deposits. Trading early-stage bonding curve tokens carries severe volatility, capital risk, and smart contract dependency. Never trade more capital than you can afford to lose completely.