oxfrancesco/evm-balance-checker
evm-balance-checker/SKILL.md
--- name: evm-balance-checker description: Check EVM wallet balances across multiple chains using reliable RPC endpoints. Supports native ETH and ERC20 token balance checks. Use when you need to: (1) Check wallet balance on Ethereum, Base, Polygon, or Arbitrum, (2) Query balances on testnets (Sepolia), (3) Verify funds before transactions, (4) Check balances across multiple chains at once. Includes built-in reliable RPC endpoints to avoid common issues with flaky public nodes. --- # EVM Balance
development
Updated Apr 11, 2026
$ install --global
skillsauthnpx skillsauth add oxfrancesco/clawd-web3-skills evm-balance-checkerInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
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CrowdStrikeAdvanced threat intelligence
50%
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OSV-ScannerOpen Source Vulnerability database check
50%
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OWASP Dep-Check
50%
Last scanned: Apr 11, 2026, 2:37 AM4.5s3 files scanned
SKILL.md
- name:
- evm-balance-checker
- description:
- Check EVM wallet balances across multiple chains using reliable RPC endpoints. Supports native ETH and ERC20 token balance checks. Use when you need to: (1) Check wallet balance on Ethereum, Base, Polygon, or Arbitrum, (2) Query balances on testnets (Sepolia), (3) Verify funds before transactions, (4) Check balances across multiple chains at once. Includes built-in reliable RPC endpoints to avoid common issues with flaky public nodes.
EVM Balance Checker
Check wallet balances across Ethereum Virtual Machine (EVM) chains using reliable RPC endpoints.
Quick Start
Check a wallet balance on Ethereum Sepolia testnet:
bun scripts/check-balance.ts --address 0x1234...
Check on a specific chain:
bun scripts/check-balance.ts --address 0x1234... --chain base-sepolia
Check balance with tokens:
bun scripts/check-balance.ts --address 0x1234... --tokens
Check all supported chains:
bun scripts/check-balance.ts --address 0x1234... --all
Supported Chains
| Chain | ID | Native Token |
|-------|-----|--------------|
| ethereum-sepolia | Ethereum Sepolia | ETH |
| base-sepolia | Base Sepolia | ETH |
| ethereum | Ethereum Mainnet | ETH |
| base | Base Mainnet | ETH |
| polygon | Polygon Mainnet | MATIC |
| arbitrum | Arbitrum One | ETH |
Common Options
--address <addr>- Wallet address to check (required)--chain <chain>- Chain to check (default: ethereum-sepolia)--tokens- Check ERC20 token balances (USDC, etc.)--all- Check all supported chains--json- Output as JSON for programmatic use
Examples
Check balance on Ethereum Sepolia:
bun scripts/check-balance.ts --address 0xc54f836CBb4299B828b696Ef56f42edd898b3486
Check on Base Sepolia with tokens:
bun scripts/check-balance.ts --address 0x1234... --chain base-sepolia --tokens
Check across all chains:
bun scripts/check-balance.ts --address 0x1234... --all
JSON output for scripts:
bun scripts/check-balance.ts --address 0x1234... --json
Why This Skill?
Public RPC endpoints can be unreliable - some return wrong data, time out, or have rate limits. This skill uses tested, reliable RPC endpoints to ensure accurate balance checks.
The script automatically:
- Handles wei-to-ETH conversion
- Checks ERC20 token balances (USDC on testnets)
- Tries multiple endpoints if one fails
- Provides clear error messages
Advanced Usage
See references/rpc-endpoints.md for:
- Full list of RPC endpoints
- ERC20 token addresses
- Manual RPC method examples
- Alternative RPC providers
Common Issues
Incorrect balance: Ensure you're checking the right chain. Testnet addresses work on testnets, not mainnet.
Timeout: Some public RPCs can be slow. The script uses fast, reliable endpoints by default.
Zero balance: New wallets or unused addresses show 0. Ensure you have the correct address.
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