Autonomous ETH/USDC spot bot on Base using Uniswap v3. Designed for dedicated-wallet micro-accounts (≤ $12) with mean-reversion bands, QuoterV2 slippage protection, and strict per-session trade + loss caps.

Why you might read this repo

• Honest scope: tiny account, tiny risk, hard capital cap — no hype.
• Safe wallet pattern: never uses your main MetaMask; bot trades from a dedicated, low-balance address whose key lives in .env only.
• Uniswap v3 done right: QuoterV2 + amountOutMinimum with slippage buffer, cooldowns between trades, single-position constraint.
• Contracts documented: WETH / USDC / pool / QuoterV2 / SwapRouter02 / Factory addresses included for auditability.

Part of the ARC ecosystem

Charm is the on-chain sibling of BrokeBot (CEX funding-rate). Both can be wired to the ARC-Core event spine for receipts + replay:

• ARC-Core
• omnibinary-runtime + Arc-RAR — any-OS portability.
• Portfolio — full project index.

Keywords

uniswap v3 bot · base chain bot · defi trading bot · ethers.js bot · mean reversion · slippage protection · dedicated bot wallet · on-chain trading · micro-account · metamask · nodejs

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📖 Official docs

Open the rendered official docs → https://garebear99.github.io/Charm/official/charm_extension_spec_v3.html

Also available under docs/official/ in-tree, and through the Pages landing at https://garebear99.github.io/Charm/.

Charm Extension (Base / Uniswap v3) — $≤12 Spot Bot

This package runs an autonomous ETH<->USDC spot bot on Base using Uniswap v3. It is designed for small accounts and enforces a hard capital cap (default: $12).

Important: MetaMask + Autonomy

MetaMask is best used to fund a dedicated bot wallet (new address) with ≤ $12. The bot then trades from that wallet using an RPC provider. This is the normal way to run autonomous bots without fragile browser-extension automation.

What it does

• Samples the Uniswap v3 WETH/USDC 0.05% pool price on Base.
• Computes rolling mean + stdev bands.
• Buys WETH with USDC when price is low (below lower band) and cooldown allows.
• Sells WETH back to USDC when price is high (above upper band) and cooldown allows.
• Uses Uniswap QuoterV2 to compute amountOutMinimum with a slippage buffer.
• Enforces strict safety limits:
  • single position at a time
  • max trades per session
  • stop after consecutive losses
  • halts if total value exceeds cap

Requirements

• Node.js 18+
• A Base RPC URL (default Base public RPC works)
• A dedicated bot wallet private key funded on Base

Setup

cd charm-extension-bot
npm install
cp .env.example .env
# edit .env with your BOT_PRIVATE_KEY and optional params
npm run start

Dry run (no transactions)

npm run dryrun

Funding (MetaMask)

1. In MetaMask, add Base network.
2. Bridge USDC to Base.
3. Send ≤ $12 USDC to your bot wallet address.

Notes

• This is probabilistic. There is no guarantee to double $10 in 48h.
• Do not run this with your main wallet.
• Start with DRY_RUN to confirm pricing + signals.

Addresses (Base)

• WETH: 0x4200000000000000000000000000000000000006
• USDC: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
• Uniswap v3 WETH/USDC 0.05% pool: 0xd0b53D9277642d899DF5C87A3966A349A798F224
• Uniswap QuoterV2: 0x3d4e44Eb1374240CE5F1B871ab261CD16335B76a
• Uniswap SwapRouter02: 0x2626664c2603336E57B271c5C0b26F421741e481
• Uniswap V3 Factory: 0x33128a8fC17869897dcE68Ed026d694621f6FDfD

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🧭 ARC Trading Fleet

Six sibling repositories. Same ARC event-and-receipt doctrine. Each has its own live GitHub Pages docs site, source, and README.

Repo	One-liner	Source	Docs site
BrokeBot	TRON Funding-Rate Arbitrage (CEX, Python)	source	https://garebear99.github.io/BrokeBot/
Charm (you are here)	Uniswap v3 Spot Bot on Base (Node.js)	source	https://garebear99.github.io/Charm/
Harvest	Multi-Timeframe Crypto Research Platform (Python)	source	https://garebear99.github.io/Harvest/
One-Shot-Multi-Shot	Binary-Options 3-Hearts Engine (JS)	source	https://garebear99.github.io/One-Shot-Multi-Shot/
DecaGrid	Capital-Ladder Grid Trading Docs Pack	source	https://garebear99.github.io/DecaGrid/
EdgeStack Currency	Event-Sourced Multi-Currency Execution Spec	source	https://garebear99.github.io/EdgeStack_Currency/

Upstream + meta

• ARC-Core — governed event + receipt spine the fleet plugs into.
• omnibinary-runtime + Arc-RAR — any-OS portability for deployment.
• Portfolio — full project index (audio plugins, games, simulators, AI runtimes, robotics, trading).

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💖 Support the fleet

If this repo helps you, the maintainer runs the entire ARC ecosystem solo. Any of the following keep the lights on:

• GitHub Sponsors: https://github.com/sponsors/GareBear99
• Buy Me a Coffee: https://www.buymeacoffee.com/garebear99
• Ko-fi: https://ko-fi.com/garebear99

Every dollar funds hardening across ARC-Core + the 15 consumer repos + the four roadmap repos. One author, one funding pool.