Optimizing Gas FeesSAFE

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The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
name: optimizing-gas-fees
description: 'Optimize blockchain gas costs by analyzing prices, patterns, and timing.

  Use when checking gas prices, estimating costs, or finding optimal windows.

  Trigger with phrases like "gas prices", "optimize gas", "transaction cost", "when
  to transact".

  '
allowed-tools: Read, Bash(python3:*)
version: 1.27.0
author: Jeremy Longshore <[email protected]>
license: MIT
tags:
- crypto
- cost-optimization
- optimizing-gas
compatibility: Designed for Claude Code
---
# Optimizing Gas Fees

## Overview

Gas fee optimization skill that:

- Fetches real-time gas prices from multiple sources
- Estimates transaction costs in ETH and USD
- Analyzes historical patterns to find optimal timing
- Predicts future gas prices
- Compares gas across multiple chains

## Prerequisites

- Python 3.8+ with requests library
- Network access to RPC endpoints
- Optional: `ETHERSCAN_API_KEY` for higher rate limits
- Optional: Custom RPC URLs via environment variables

## Instructions

1. Check current gas prices (optionally for a specific chain):

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py current
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py current --chain polygon
   ```

2. Estimate transaction cost for known operations or custom gas limits (available operations: `eth_transfer`, `erc20_transfer`, `erc20_approve`, `uniswap_v2_swap`, `uniswap_v3_swap`, `sushiswap_swap`, `curve_swap`, `nft_mint`, `nft_transfer`, `opensea_listing`, `aave_deposit`, `aave_withdraw`, `compound_supply`, `compound_borrow`, `bridge_deposit`):

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py estimate --operation uniswap_v2_swap --all-tiers
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py estimate --gas-limit 150000 --tier fast  # 150000 = configured value
   ```

3. Find the optimal transaction window with lowest expected gas:

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py optimal
   ```

4. View gas patterns (hourly or daily):

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py patterns
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py patterns --daily
   ```

5. Predict future gas prices for a given hour:

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py predict --time 14
   ```

6. Compare gas prices across multiple chains:

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py compare
   ```

7. View base fee history for recent blocks:

   ```bash
   cd ${CLAUDE_SKILL_DIR}/scripts && python3 gas_optimizer.py history --blocks 50
   ```

## Output

- **Current**: Base fee, priority fee, and tier prices (slow/standard/fast/instant)
- **Estimate**: Gas cost in native token and USD for each tier
- **Patterns**: Historical hourly/daily patterns with low-gas markers
- **Optimal**: Recommended transaction window with expected savings
- **Predict**: Gas forecast for specific time with confidence
- **Compare**: Side-by-side gas prices across chains

## Supported Chains

| Chain | Native Token | Block Time |
|-------|--------------|------------|
| Ethereum | ETH | ~12 sec |
| Polygon | MATIC | ~2 sec |
| Arbitrum | ETH | ~0.25 sec |
| Optimism | ETH | ~2 sec |
| Base | ETH | ~2 sec |

## Price Tiers

| Tier | Percentile | Confirmation Time |
|------|------------|-------------------|
| Slow | 10th | 10+ blocks (~2+ min) |
| Standard | 50th | 3-5 blocks (~1 min) |
| Fast | 75th | 1-2 blocks (~30 sec) |
| Instant | 90th | Next block (~12 sec) |

## Error Handling

See `${CLAUDE_SKILL_DIR}/references/errors.md` for:

- RPC connection issues
- API rate limiting
- Price feed errors
- Pattern analysis errors

## Examples

See `${CLAUDE_SKILL_DIR}/references/examples.md` for:

- Quick start commands
- Cost estimation scenarios
- Multi-chain comparison
- Practical workflows

## Resources

- [EIP-1559](https://eips.ethereum.org/EIPS/eip-1559) - Fee market specification
- [Etherscan Gas Tracker](https://etherscan.io/gastracker) - Reference oracle
- [L2Fees](https://l2fees.info/) - L2 cost comparison

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

What the source does

Filesystem

none-observed

Network

declared (3 observation(s))

Shell

none-observed

Dependencies

pinned

Secrets in source

none-found

Findings (1)

1. Use Read tool to load API credentials from ${CLAUDE_SKILL_DIR}/config/crypto-apis.env

Gates applied: no_behavioural_pass.