| name | chain-registry |
| description | Look up EVM chain IDs, RPC URLs, native tokens, and block explorers.
USE THIS SKILL TO:
- Resolve a chain name to its chain ID (e.g., "what's the chain ID for Base?")
- Get the RPC URL for a chain (e.g., "RPC for Arbitrum")
- Look up a chain by its numeric ID (e.g., "what chain is 42161?")
- List all supported EVM chains
- Get block explorer URLs for any supported chain
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| metadata | {"author":"gigabrain","version":"1.0"} |
Chain Registry
Look up EVM chain metadata without reading large files. Supports 15+ mainnet chains with curated public RPCs (sourced from chainlist.org).
Resolve SKILL_DIR as the directory containing this SKILL.md, then run scripts from absolute paths under that directory. Do not rely on the current working directory.
Commands
Look up a chain by name
uv run "$SKILL_DIR/scripts/chain_registry.py" lookup --chain base
Look up a chain by ID
uv run "$SKILL_DIR/scripts/chain_registry.py" lookup --chain-id 42161
Get just the RPC URL
uv run "$SKILL_DIR/scripts/chain_registry.py" rpc --chain ethereum
List all supported chains
uv run "$SKILL_DIR/scripts/chain_registry.py" list
Supported Chains
ethereum, arbitrum, base, optimism, polygon, bsc, avalanche, gnosis, fantom, linea, scroll, zksync, mantle, blast, mode
Aliases
Common aliases are supported: eth/mainnet → ethereum, arb → arbitrum, op → optimism, matic/poly → polygon, avax → avalanche, bnb/binance → bsc
Output Format
All commands output JSON to stdout:
{"success": true, "chain": "base", "chain_id": 8453, "rpc": "https://mainnet.base.org", "native_symbol": "ETH", "native_decimals": 18, "explorer": "https://basescan.org"}
Path Resolution
SKILL_DIR means the directory containing this SKILL.md.
