evm

Files (2)

• SKILL.md
• evm_client.py · scripts/

SKILL.md (first lines)

# EVM Blockchain Skill

Query EVM-compatible blockchain data across 8 chains with USD pricing.
14 commands: wallet portfolio, token info, transactions, activity, gas tracker,
network stats, price lookup, multi-chain scan, whale detection, ENS resolution,
allowance checker, contract inspector, and transaction decoder.

Supports 8 chains: Ethereum, BNB Chain (BSC), Base, Arbitrum One, Polygon,
Optimism, Avalanche (C-Chain), zkSync Era.

No API key needed. Zero external dependencies — Python standard library only
(urllib, json, argparse, threading).

> **Supersedes the standalone `base` skill.** Base-specific tokens (AERO, DEGEN,
> TOSHI, BRETT, WELL, cbETH, cbBTC, wstETH, rETH) and all Base RPC functionality
> previously living under `optional-skills/blockchain/base/` have been folded
> into this skill. Pass `--chain base` to any command for Base coverage.

---

## When to Use
- User asks for a wallet balance or portfolio on any EVM chain
- User wants to check the same wallet across ALL chains at once
- User wants to inspect a transaction by hash (or decode what it did)
- User wants ERC-20 token metadata, price, supply, or market cap
- User wants recent transaction history for an address
- User wants current gas prices or to compare fees across chains
- User wants to find large whale transfers in recent blocks
- User asks to resolve an ENS name (vitalik.eth) or reverse-lookup an address
- User wants to check if a contract has dangerous token approvals
- User wants to inspect a smart contract (proxy? ERC-20? ERC-721? bytecode size?)
- User wants to compare gas costs across chains before a transaction

---

## Prerequisites
Python 3.8+ standard library only. No pip installs required.
Pricing: CoinGecko free API (rate-limited, ~10-30 req/min).
ENS: ensideas.com public API.
Tx decoding: 4byte.directory public API.

Override RPC endpoint: `export EVM_RPC_URL=https://your-rpc.com`

Helper script path: `~/.hermes/skills/blockchain/evm/scripts/evm_client.py`

---

## Quick Reference

```
SCRIPT=~/.hermes/skills/blockchain/evm/scripts/evm_client.py

# Network & prices
python3 $SCRIPT stats                            # Ethereum stats
python3 $SCRIPT stats --chain arbitrum           # Arbitrum stats
python3 $SCRIPT compare                          # Gas + prices ALL 8 chains

# Wallet
python3 $SCRIPT wallet 0xd8dA...96045            # Portfolio (ETH + ERC-20)
python3 $SCRIPT wallet 0xd8dA...96045 --chain bsc
python3 $SCRIPT multichain 0xd8dA...96045        # Same wallet on ALL chains

# Tokens & prices
python3 $SCRIPT price ETH
python3 $SCRIPT price 0xdAC1...1ec7              # By contract address
python3 $SCRIPT token 0xdAC1...1ec7              # ERC-20 metadata + market cap

# Transactions
python3 $SCRIPT tx 0x5c50...f060                 # Transaction details
python3 $SCRIPT decode 0x5c50...f060             # Decode input data (4byte.directory)
python3 $SCRIPT activity 0xd8dA...96045          # Recent transactions

# Gas
python3 $SCRIPT gas                              # Gas prices + cost estimates
python3 $SCRIPT gas --chain optimism

# Security
python3 $SCRIPT allowance 0xd8dA...96045         # Dangerous ERC-20 approvals
python3 $SCRIPT contract 0xdAC1...1ec7           # Contract inspection (proxy? standards?)

# ENS
python3 $SCRIPT ens vitalik.eth                  # Name -> address + profile
python3 $SCRIPT ens 0xd8dA...96045               # Address -> ENS name

# Whale detection
python3 $SCRIPT whale                            # Large transfers (last 20 blocks, >$10k)
python3 $SCRIPT whale --blocks 50 --min-usd 100000 --chain arbitrum
```

---

## Procedure

### 0. Setup Check
```bash
python3 --version   # 3.8+ required
python3 ~/.hermes/skills/blockchain/evm/scripts/evm_client.py stats
```

### 1. Wallet Portfolio
Native balance + known ERC-20 tokens, sorted by USD value.
```bash
python3 $SCRIPT wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
python3 $SCRIPT wallet 0xd8dA... --chain bsc --no-prices   # faster
```

### 2. Multi-Chain Scan
Scans all 8 chains simultaneously for the same address using threads.
```bash
python3 $SCRIPT multichain 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
```
Output: per-chain native balance + token holdings + grand total USD.

### 3. Compare (Gas + Prices)
All 8 chains queried in parallel. Shows cheapest/most expensive chain.
```bash
python3 $SCRIPT compare
```

From lukemcqueen/hermes-cortex, MIT.

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