feat: add Base blockchain optional skill
* add base support * fix: correct skill author attribution to youssefea --------- Co-authored-by: youssefea <youcefea99@gmail.com>
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Teknium
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optional-skills/blockchain/base/SKILL.md
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optional-skills/blockchain/base/SKILL.md
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---
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name: base
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description: Query Base (Ethereum L2) blockchain data with USD pricing — wallet balances, token info, transaction details, gas analysis, contract inspection, whale detection, and live network stats. Uses Base RPC + CoinGecko. No API key required.
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version: 0.1.0
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author: youssefea
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license: MIT
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metadata:
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hermes:
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tags: [Base, Blockchain, Crypto, Web3, RPC, DeFi, EVM, L2, Ethereum]
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related_skills: []
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---
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# Base Blockchain Skill
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Query Base (Ethereum L2) on-chain data enriched with USD pricing via CoinGecko.
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8 commands: wallet portfolio, token info, transactions, gas analysis,
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contract inspection, whale detection, network stats, and price lookup.
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No API key needed. Uses only Python standard library (urllib, json, argparse).
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---
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## When to Use
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- User asks for a Base wallet balance, token holdings, or portfolio value
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- User wants to inspect a specific transaction by hash
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- User wants ERC-20 token metadata, price, supply, or market cap
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- User wants to understand Base gas costs and L1 data fees
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- User wants to inspect a contract (ERC type detection, proxy resolution)
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- User wants to find large ETH transfers (whale detection)
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- User wants Base network health, gas price, or ETH price
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- User asks "what's the price of USDC/AERO/DEGEN/ETH?"
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---
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## Prerequisites
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The helper script uses only Python standard library (urllib, json, argparse).
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No external packages required.
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Pricing data comes from CoinGecko's free API (no key needed, rate-limited
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to ~10-30 requests/minute). For faster lookups, use `--no-prices` flag.
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---
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## Quick Reference
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RPC endpoint (default): https://mainnet.base.org
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Override: export BASE_RPC_URL=https://your-private-rpc.com
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Helper script path: ~/.hermes/skills/blockchain/base/scripts/base_client.py
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```
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python3 base_client.py wallet <address> [--limit N] [--all] [--no-prices]
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python3 base_client.py tx <hash>
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python3 base_client.py token <contract_address>
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python3 base_client.py gas
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python3 base_client.py contract <address>
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python3 base_client.py whales [--min-eth N]
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python3 base_client.py stats
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python3 base_client.py price <contract_address_or_symbol>
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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
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# Optional: set a private RPC for better rate limits
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export BASE_RPC_URL="https://mainnet.base.org"
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# Confirm connectivity
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py stats
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```
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### 1. Wallet Portfolio
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Get ETH balance and ERC-20 token holdings with USD values.
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Checks ~15 well-known Base tokens (USDC, WETH, AERO, DEGEN, etc.)
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via on-chain `balanceOf` calls. Tokens sorted by value, dust filtered.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py \
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wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
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```
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Flags:
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- `--limit N` — show top N tokens (default: 20)
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- `--all` — show all tokens, no dust filter, no limit
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- `--no-prices` — skip CoinGecko price lookups (faster, RPC-only)
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Output includes: ETH balance + USD value, token list with prices sorted
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by value, dust count, total portfolio value in USD.
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Note: Only checks known tokens. Unknown ERC-20s are not discovered.
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Use the `token` command with a specific contract address for any token.
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### 2. Transaction Details
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Inspect a full transaction by its hash. Shows ETH value transferred,
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gas used, fee in ETH/USD, status, and decoded ERC-20/ERC-721 transfers.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py \
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tx 0xabc123...your_tx_hash_here
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```
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Output: hash, block, from, to, value (ETH + USD), gas price, gas used,
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fee, status, contract creation address (if any), token transfers.
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### 3. Token Info
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Get ERC-20 token metadata: name, symbol, decimals, total supply, price,
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market cap, and contract code size.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py \
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token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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```
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Output: name, symbol, decimals, total supply, price, market cap.
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Reads name/symbol/decimals directly from the contract via eth_call.
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### 4. Gas Analysis
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Detailed gas analysis with cost estimates for common operations.
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Shows current gas price, base fee trends over 10 blocks, block
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utilization, and estimated costs for ETH transfers, ERC-20 transfers,
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and swaps.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py gas
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```
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Output: current gas price, base fee, block utilization, 10-block trend,
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cost estimates in ETH and USD.
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Note: Base is an L2 — actual transaction costs include an L1 data
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posting fee that depends on calldata size and L1 gas prices. The
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estimates shown are for L2 execution only.
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### 5. Contract Inspection
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Inspect an address: determine if it's an EOA or contract, detect
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ERC-20/ERC-721/ERC-1155 interfaces, resolve EIP-1967 proxy
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implementation addresses.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py \
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contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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```
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Output: is_contract, code size, ETH balance, detected interfaces
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(ERC-20, ERC-721, ERC-1155), ERC-20 metadata, proxy implementation
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address.
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### 6. Whale Detector
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Scan the most recent block for large ETH transfers with USD values.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py \
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whales --min-eth 1.0
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```
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Note: scans the latest block only — point-in-time snapshot, not historical.
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Default threshold is 1.0 ETH (lower than Solana's default since ETH
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values are higher).
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### 7. Network Stats
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Live Base network health: latest block, chain ID, gas price, base fee,
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block utilization, transaction count, and ETH price.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py stats
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```
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### 8. Price Lookup
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Quick price check for any token by contract address or known symbol.
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```bash
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py price ETH
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py price USDC
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py price AERO
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py price DEGEN
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py price 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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```
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Known symbols: ETH, WETH, USDC, cbETH, AERO, DEGEN, TOSHI, BRETT,
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WELL, wstETH, rETH, cbBTC.
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---
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## Pitfalls
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- **CoinGecko rate-limits** — free tier allows ~10-30 requests/minute.
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Price lookups use 1 request per token. Use `--no-prices` for speed.
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- **Public RPC rate-limits** — Base's public RPC limits requests.
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For production use, set BASE_RPC_URL to a private endpoint
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(Alchemy, QuickNode, Infura).
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- **Wallet shows known tokens only** — unlike Solana, EVM chains have no
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built-in "get all tokens" RPC. The wallet command checks ~15 popular
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Base tokens via `balanceOf`. Unknown ERC-20s won't appear. Use the
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`token` command for any specific contract.
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- **Token names read from contract** — if a contract doesn't implement
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`name()` or `symbol()`, these fields may be empty. Known tokens have
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hardcoded labels as fallback.
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- **Gas estimates are L2 only** — Base transaction costs include an L1
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data posting fee (depends on calldata size and L1 gas prices). The gas
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command estimates L2 execution cost only.
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- **Whale detector scans latest block only** — not historical. Results
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vary by the moment you query. Default threshold is 1.0 ETH.
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- **Proxy detection** — only EIP-1967 proxies are detected. Other proxy
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patterns (EIP-1167 minimal proxy, custom storage slots) are not checked.
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- **Retry on 429** — both RPC and CoinGecko calls retry up to 2 times
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with exponential backoff on rate-limit errors.
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---
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## Verification
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```bash
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# Should print Base chain ID (8453), latest block, gas price, and ETH price
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python3 ~/.hermes/skills/blockchain/base/scripts/base_client.py stats
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```
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1008
optional-skills/blockchain/base/scripts/base_client.py
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1008
optional-skills/blockchain/base/scripts/base_client.py
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