# biddin

> A memecoin launchpad on Arc, Circle's L1 where gas is paid in USDC. A token is sold along a
> bonding curve priced in USDC; at 8,000 USDC raised it graduates into a permanently locked
> Uniswap V3 position. Launching is one contract call with no prior approval, costs a flat
> 1.00 USDC, and pays the creator 70% of every trade fee forever — on the curve and after
> graduation. Arc mainnet, chain 5042.

Everything is enforced by public contracts. You can launch, trade, read and index without using
our site. Where any document and the contracts disagree, the contracts are right.

## Docs

- [Integration docs (Markdown)](https://biddin.win/docs.md): The complete developer reference — launching from code, trading the curve, reading state, event topics, fees, addresses, and the Arc-specific traps that break integrations.
- [Integration docs (HTML)](https://biddin.win/docs): The same content, rendered.

## Key facts

- Launch entry point: `launchWithNative(Metadata meta, LaunchOptions opts) payable` on the factory at `0xA5b69A713bf53C7f6f2E230428CebA62842fc9e2`. Creates the token, opens its curve, optionally buys your own allocation and optionally enrols buyback-and-burn, in one transaction.
- Value must be exact: `params().launchFee + opts.devBuyQuote`, scaled by `1e12`. The factory refuses an over- or under-payment.
- USDC has two decimal counts on Arc: 18 as the native gas balance (`msg.value`), 6 as the ERC-20 at `0x3600000000000000000000000000000000000000`. Every struct amount is the 6-decimal one.
- Fees: 1.00% per trade on the USDC leg, split 70% creator / 30% protocol, on the curve and after graduation. A creator may add a tax of 0–10% on top, frozen at launch.
- Anti-snipe: buys in the first 4 seconds pay a tax that steps down 99% → 12.37% → 0.77% → 0.09% → 0, once per whole second. Selling is never taxed. A creator may exempt up to 100 wallets, and every exemption is public via the `SnipeTaxExempted(address)` event.
- Every economic parameter is `immutable` on each coin's curve. The owning 2-of-3 Safe can change what future launches inherit; it has no function that can reach a coin that already exists.

## Contracts (Arc mainnet, chain 5042 — final, safe to compile in)

- Launch factory: `0xA5b69A713bf53C7f6f2E230428CebA62842fc9e2`
- Fee escrow: `0xcC7F665d28247155a48d359A281761A397E75DF7`
- V3 liquidity locker: `0x8C6B6A4Cc7E8B6D3715BcB0be0fD677bF8cb3Ead`
- Buyback factory: `0x203343182aD32A66d53355a64Bc71baaC6DC5E40`
- Quote asset (Arc USDC): `0x3600000000000000000000000000000000000000`
- Owner (2-of-3 Safe): `0xA4F1883D025E12e760124A9701704133A6FB6D1e`

## Optional

- [Agent skill: launch a token on biddin](https://biddin.win/skills/launch-token-on-biddin/SKILL.md): Step-by-step instructions for an AI coding agent to launch a token end to end, including the confirmation the agent must get from its user before spending money.