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feat(skills): merge blockchain/base into blockchain/evm; salvage PR #2010
Salvages the closed PR #2010 (Mibayy's EVM multi-chain skill) and folds the existing optional-skills/blockchain/base/ skill into it, so we ship one unified EVM skill instead of two overlapping ones. Pulled in from base/: - 8 missing Base-specific tokens (AERO, DEGEN, TOSHI, BRETT, WELL, cbETH, cbBTC, wstETH, rETH) added to KNOWN_TOKENS['base'] — base/ had 11, evm/ only had 3 (USDC/DAI/WETH). - L1 data-fee pitfall note for rollups (Base, Arbitrum, Optimism, zkSync). - Batch-size chunking in rpc_batch (Base RPC caps batches at 10 calls per JSON-RPC request; adding more known tokens tripped that limit and broke 'wallet --chain base' with a 'list index out of range' error). Ported the chunking pattern from base/_rpc_batch_chunk. Latent bugs found and fixed while smoke-testing the merge: - cmd_multichain and cmd_allowance both iterated KNOWN_TOKENS[chain] with 'for contract, (symbol, _name) in known.items()' — but the dict shape is {symbol: contract_str}, not {addr: (sym, name)}. This raised 'too many values to unpack (expected 2)' on every non-zero balance. Now iterates as 'for symbol, contract in known.items()'. - Input validation: added is_valid_address / is_valid_txhash / require_address / require_txhash helpers and wired them into cmd_wallet, cmd_tx, cmd_token, cmd_activity, cmd_allowance, cmd_decode, cmd_contract, cmd_multichain. Fails fast with exit 2 on malformed input instead of burning an RPC round-trip on garbage. Documentation: - SKILL.md now flags that this skill supersedes optional-skills/blockchain/base. - Pitfalls expanded for ENS (single-endpoint dependency on ensideas.com), tx decoding (single-endpoint dependency on 4byte.directory), and rollup L1 fees. - Regenerated website/docs/user-guide/skills/optional/blockchain/ blockchain-evm.md and removed the old blockchain-base.md page; catalog updated. Removed: - optional-skills/blockchain/base/SKILL.md - optional-skills/blockchain/base/scripts/base_client.py - website/docs/user-guide/skills/optional/blockchain/blockchain-base.md Smoke-tested live against Base mainnet: stats, price, token, wallet (vitalik.eth — 3.12 ETH + 13.88 USDC + 4.23 DAI + 0.06 WETH on Base) and allowance (ethereum, 7 unlimited approvals to Uniswap/Permit2). Original PR #2010 author: Mibayy. Original base/ skill author: youssefea.
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---
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title: "Evm"
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sidebar_label: "Evm"
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description: "Query EVM blockchain data across 8 chains — wallet portfolios, ERC-20 tokens, transactions, gas tracker, whale detection, multi-chain scan, ENS resolution, a..."
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---
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{/* This page is auto-generated from the skill's SKILL.md by website/scripts/generate-skill-docs.py. Edit the source SKILL.md, not this page. */}
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# Evm
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Query EVM blockchain data across 8 chains — wallet portfolios, ERC-20 tokens, transactions, gas tracker, whale detection, multi-chain scan, ENS resolution, allowance checker, contract inspection, and tx decoder. Supports Ethereum, BNB Chain, Base, Arbitrum, Polygon, Optimism, Avalanche, zkSync. Uses public RPCs + CoinGecko. No API key required.
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## Skill metadata
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| | |
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|---|---|
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| Source | Optional — install with `hermes skills install official/blockchain/evm` |
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| Path | `optional-skills/blockchain/evm` |
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| Version | `1.0.0` |
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| Author | Mibayy |
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| License | MIT |
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| Tags | `EVM`, `Ethereum`, `BNB`, `BSC`, `Base`, `Arbitrum`, `Polygon`, `Optimism`, `Avalanche`, `zkSync`, `Blockchain`, `Crypto`, `Web3`, `DeFi`, `NFT`, `ENS`, `Whale`, `Security` |
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| Related skills | [`solana`](/docs/user-guide/skills/optional/blockchain/blockchain-solana) |
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## Reference: full SKILL.md
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:::info
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The following is the complete skill definition that Hermes loads when this skill is triggered. This is what the agent sees as instructions when the skill is active.
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:::
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# EVM Blockchain Skill
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Query EVM-compatible blockchain data across 8 chains with USD pricing.
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14 commands: wallet portfolio, token info, transactions, activity, gas tracker,
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network stats, price lookup, multi-chain scan, whale detection, ENS resolution,
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allowance checker, contract inspector, and transaction decoder.
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Supports 8 chains: Ethereum, BNB Chain (BSC), Base, Arbitrum One, Polygon,
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Optimism, Avalanche (C-Chain), zkSync Era.
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No API key needed. Zero external dependencies — Python standard library only
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(urllib, json, argparse, threading).
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> **Supersedes the standalone `base` skill.** Base-specific tokens (AERO, DEGEN,
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> TOSHI, BRETT, WELL, cbETH, cbBTC, wstETH, rETH) and all Base RPC functionality
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> previously living under `optional-skills/blockchain/base/` have been folded
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> into this skill. Pass `--chain base` to any command for Base coverage.
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---
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## When to Use
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- User asks for a wallet balance or portfolio on any EVM chain
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- User wants to check the same wallet across ALL chains at once
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- User wants to inspect a transaction by hash (or decode what it did)
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- User wants ERC-20 token metadata, price, supply, or market cap
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- User wants recent transaction history for an address
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- User wants current gas prices or to compare fees across chains
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- User wants to find large whale transfers in recent blocks
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- User asks to resolve an ENS name (vitalik.eth) or reverse-lookup an address
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- User wants to check if a contract has dangerous token approvals
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- User wants to inspect a smart contract (proxy? ERC-20? ERC-721? bytecode size?)
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- User wants to compare gas costs across chains before a transaction
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---
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## Prerequisites
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Python 3.8+ standard library only. No pip installs required.
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Pricing: CoinGecko free API (rate-limited, ~10-30 req/min).
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ENS: ensideas.com public API.
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Tx decoding: 4byte.directory public API.
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Override RPC endpoint: `export EVM_RPC_URL=https://your-rpc.com`
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Helper script path: `~/.hermes/skills/blockchain/evm/scripts/evm_client.py`
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---
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## Quick Reference
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```
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SCRIPT=~/.hermes/skills/blockchain/evm/scripts/evm_client.py
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# Network & prices
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python3 $SCRIPT stats # Ethereum stats
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python3 $SCRIPT stats --chain arbitrum # Arbitrum stats
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python3 $SCRIPT compare # Gas + prices ALL 8 chains
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# Wallet
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python3 $SCRIPT wallet 0xd8dA...96045 # Portfolio (ETH + ERC-20)
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python3 $SCRIPT wallet 0xd8dA...96045 --chain bsc
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python3 $SCRIPT multichain 0xd8dA...96045 # Same wallet on ALL chains
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# Tokens & prices
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python3 $SCRIPT price ETH
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python3 $SCRIPT price 0xdAC1...1ec7 # By contract address
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python3 $SCRIPT token 0xdAC1...1ec7 # ERC-20 metadata + market cap
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# Transactions
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python3 $SCRIPT tx 0x5c50...f060 # Transaction details
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python3 $SCRIPT decode 0x5c50...f060 # Decode input data (4byte.directory)
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python3 $SCRIPT activity 0xd8dA...96045 # Recent transactions
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# Gas
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python3 $SCRIPT gas # Gas prices + cost estimates
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python3 $SCRIPT gas --chain optimism
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# Security
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python3 $SCRIPT allowance 0xd8dA...96045 # Dangerous ERC-20 approvals
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python3 $SCRIPT contract 0xdAC1...1ec7 # Contract inspection (proxy? standards?)
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# ENS
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python3 $SCRIPT ens vitalik.eth # Name -> address + profile
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python3 $SCRIPT ens 0xd8dA...96045 # Address -> ENS name
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# Whale detection
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python3 $SCRIPT whale # Large transfers (last 20 blocks, >$10k)
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python3 $SCRIPT whale --blocks 50 --min-usd 100000 --chain arbitrum
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```
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---
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## Procedure
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### 0. Setup Check
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```bash
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python3 --version # 3.8+ required
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python3 ~/.hermes/skills/blockchain/evm/scripts/evm_client.py stats
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```
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### 1. Wallet Portfolio
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Native balance + known ERC-20 tokens, sorted by USD value.
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```bash
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python3 $SCRIPT wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
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python3 $SCRIPT wallet 0xd8dA... --chain bsc --no-prices # faster
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```
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### 2. Multi-Chain Scan
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Scans all 8 chains simultaneously for the same address using threads.
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```bash
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python3 $SCRIPT multichain 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
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```
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Output: per-chain native balance + token holdings + grand total USD.
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### 3. Compare (Gas + Prices)
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All 8 chains queried in parallel. Shows cheapest/most expensive chain.
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```bash
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python3 $SCRIPT compare
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```
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### 4. Transaction Details & Decode
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```bash
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python3 $SCRIPT tx 0x5c504ed432cb51138bcf09aa5e8a410dd4a1e204ef84bfed1be16dfba1b22060
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python3 $SCRIPT decode 0x5c504ed... # Shows human-readable function signature
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```
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Decode uses 4byte.directory to translate 0xa9059cbb -> transfer(address,uint256).
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### 5. ENS Resolution
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```bash
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python3 $SCRIPT ens vitalik.eth # -> 0xd8dA... + avatar + social links
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python3 $SCRIPT ens 0xd8dA...96045 # -> vitalik.eth
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```
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### 6. Allowance Checker (Security)
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Checks ERC-20 approvals granted to known DEX/bridge contracts.
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```bash
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python3 $SCRIPT allowance 0xYourWallet
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```
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Flags UNLIMITED approvals as HIGH risk.
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### 7. Contract Inspector
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```bash
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python3 $SCRIPT contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 # USDC (proxy)
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python3 $SCRIPT contract 0xdAC17F958D2ee523a2206206994597C13D831ec7 # USDT (ERC-20)
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```
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Detects: proxy (EIP-1967/EIP-1167), ERC-20, ERC-721, ERC-165. Shows bytecode size and implementation address for proxies.
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### 8. Whale Detection
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```bash
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python3 $SCRIPT whale # ETH, last 20 blocks, >$10k
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python3 $SCRIPT whale --blocks 50 --min-usd 50000 --chain bsc
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```
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### 9. Gas Tracker
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```bash
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python3 $SCRIPT gas
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python3 $SCRIPT gas --chain polygon
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```
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Shows gwei price + USD cost for: transfer, ERC-20 transfer, approve, swap, NFT mint, NFT transfer.
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---
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## Supported Chains
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| Key | Name | Native | Chain ID |
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|-----------|----------------|--------|----------|
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| ethereum | Ethereum | ETH | 1 |
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| bsc | BNB Chain | BNB | 56 |
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| base | Base | ETH | 8453 |
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| arbitrum | Arbitrum One | ETH | 42161 |
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| polygon | Polygon | POL | 137 |
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| optimism | Optimism | ETH | 10 |
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| avalanche | Avalanche C | AVAX | 43114 |
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| zksync | zkSync Era | ETH | 324 |
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---
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## Pitfalls
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- CoinGecko free tier: ~10-30 req/min. Use `--no-prices` for faster wallet scans.
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- Public RPCs may throttle. Set EVM_RPC_URL to a private endpoint for production.
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- `wallet` and `allowance` only check known token list (~30 tokens per chain). Use a block explorer for complete token discovery.
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- `activity` scans recent blocks only (max 200). For full history, use Etherscan API.
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- `multichain` runs 8 parallel threads — can trigger rate limits on public RPCs.
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- ENS resolution depends on a single public endpoint (ensideas.com / ens.vitalik.ca) with no fallback. If that endpoint is down, `ens` will fail — re-run later or use a block explorer.
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- Tx decoding depends on a single public endpoint (4byte.directory) with no fallback. Selectors not in their database show up as `unknown`.
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- **L2 gas estimates are L2-execution only.** On rollups like Base, Arbitrum, Optimism, and zkSync, the actual transaction cost also includes an L1 data-posting fee that depends on calldata size and current L1 gas prices. The `gas` command does not estimate that L1 component. For Base specifically, see the network's L1 fee oracle (contract `0x420000000000000000000000000000000000000F`).
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- Address / tx-hash inputs are validated for 0x-prefix + correct length + hex, but EIP-55 checksum casing is **not** enforced (RPC endpoints accept any-case hex).
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---
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## Verification
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```bash
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# Should print current block, gas price, ETH price
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python3 ~/.hermes/skills/blockchain/evm/scripts/evm_client.py stats
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# Should resolve vitalik.eth to 0xd8dA...
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python3 ~/.hermes/skills/blockchain/evm/scripts/evm_client.py ens vitalik.eth
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```
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