Ethereum Gas Tracker

Quick Gas Check

Current gas price:

cast gas-price --rpc-url https://eth.llamarpc.com | xargs -I {} cast --to-unit {} gwei

With priority fee (EIP-1559):

cast base-fee --rpc-url https://eth.llamarpc.com | xargs -I {} cast --to-unit {} gwei

Detailed Gas Info

python3 << 'EOF'
import requests

resp = requests.post('https://eth.llamarpc.com', json={
    'jsonrpc': '2.0',
    'id': 1,
    'method': 'eth_gasPrice',
    'params': []
}).json()

gas_wei = int(resp['result'], 16)
gas_gwei = gas_wei / 1e9

print(f"Gas Price: {gas_gwei:.2f} Gwei")
print(f"Gas Price: {gas_wei} Wei")

# Estimate costs
gas_limits = {
    'ETH Transfer': 21000,
    'ERC-20 Transfer': 65000,
    'Uniswap Swap': 150000,
    'NFT Mint': 200000,
    'Contract Deploy': 500000
}

eth_price = 3000  # Update with current price

print(f"\n=== Estimated Costs (ETH @ ${eth_price}) ===")
for name, limit in gas_limits.items():
    cost_eth = (gas_wei * limit) / 1e18
    cost_usd = cost_eth * eth_price
    print(f"{name}: {cost_eth:.6f} ETH (${cost_usd:.2f})")
EOF

EIP-1559 Gas Estimation

python3 << 'EOF'
import requests

# Get fee history
resp = requests.post('https://eth.llamarpc.com', json={
    'jsonrpc': '2.0',
    'id': 1,
    'method': 'eth_feeHistory',
    'params': ['0x5', 'latest', [25, 50, 75]]
}).json()

result = resp['result']
base_fees = [int(x, 16) / 1e9 for x in result['baseFeePerGas']]

print("=== Recent Base Fees (Gwei) ===")
for i, fee in enumerate(base_fees):
    print(f"Block -{len(base_fees)-i-1}: {fee:.2f}")

print(f"\nCurrent Base Fee: {base_fees[-1]:.2f} Gwei")
print(f"Average: {sum(base_fees)/len(base_fees):.2f} Gwei")

# Priority fee recommendations
print("\n=== Recommended Priority Fees ===")
print("🐢 Low (slow): 0.5-1 Gwei")
print("🚶 Medium: 1-2 Gwei")
print("🚀 Fast: 2-5 Gwei")
print("⚡ Urgent: 5-10+ Gwei")
EOF

Gas Price APIs

Etherscan Gas Oracle

curl -s "https://api.etherscan.io/api?module=gastracker&action=gasoracle&apikey=YourKey" | \
python3 -c "
import sys, json
data = json.load(sys.stdin)['result']
print('=== Etherscan Gas Oracle ===')
print(f\"🐢 Safe Low: {data['SafeGasPrice']} Gwei\")
print(f\"🚶 Average: {data['ProposeGasPrice']} Gwei\")
print(f\"🚀 Fast: {data['FastGasPrice']} Gwei\")
print(f\"📦 Base Fee: {data.get('suggestBaseFee', 'N/A')} Gwei\")"

Blocknative Gas Estimator

curl -s "https://api.blocknative.com/gasprices/blockprices" \
  -H "Authorization: YOUR_API_KEY" | \
python3 -c "
import sys, json
data = json.load(sys.stdin)
prices = data['blockPrices'][0]['estimatedPrices']
print('=== Blocknative Estimates ===')
for p in prices:
    print(f\"{p['confidence']}% confidence: {p['price']} Gwei | Priority: {p['maxPriorityFeePerGas']} Gwei\")"

Real-Time Monitor

python3 << 'EOF'
import requests
import time
from datetime import datetime

print("=== Gas Price Monitor (Ctrl+C to stop) ===\n")

history = []

while True:
    try:
        resp = requests.post('https://eth.llamarpc.com', json={
            'jsonrpc': '2.0',
            'id': 1,
            'method': 'eth_gasPrice',
            'params': []
        }).json()

        gas_gwei = int(resp['result'], 16) / 1e9
        history.append(gas_gwei)

        if len(history) > 60:
            history.pop(0)

        avg = sum(history) / len(history)
        trend = "📈" if gas_gwei > avg else "📉" if gas_gwei < avg else "➡️"

        now = datetime.now().strftime("%H:%M:%S")
        print(f"[{now}] {gas_gwei:.2f} Gwei {trend} (avg: {avg:.2f})")

        time.sleep(10)
    except KeyboardInterrupt:
        break
    except Exception as e:
        print(f"Error: {e}")
        time.sleep(10)
EOF

Gas Cost Calculator

python3 << 'EOF'
import requests

# Get current gas price
resp = requests.post('https://eth.llamarpc.com', json={
    'jsonrpc': '2.0',
    'id': 1,
    'method': 'eth_gasPrice',
    'params': []
}).json()

gas_wei = int(resp['result'], 16)
gas_gwei = gas_wei / 1e9

# Get ETH price (using CoinGecko)
try:
    eth_resp = requests.get('https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd').json()
    eth_price = eth_resp['ethereum']['usd']
except:
    eth_price = 3000

print(f"Current Gas: {gas_gwei:.2f} Gwei")
print(f"ETH Price: ${eth_price:,.2f}\n")

operations = [
    ("ETH Transfer", 21000),
    ("ERC-20 Approve", 46000),
    ("ERC-20 Transfer", 65000),
    ("Uniswap V2 Swap", 150000),
    ("Uniswap V3 Swap", 185000),
    ("OpenSea NFT Buy", 200000),
    ("NFT Mint (single)", 150000),
    ("NFT Mint (batch 5)", 400000),
    ("Bridge Deposit", 100000),
    ("Contract Deploy (small)", 300000),
    ("Contract Deploy (large)", 1000000),
]

print("=== Transaction Cost Estimates ===")
print(f"{'Operation':<25} {'Gas':>10} {'ETH':>12} {'USD':>10}")
print("-" * 60)

for name, gas_limit in operations:
    cost_eth = (gas_wei * gas_limit) / 1e18
    cost_usd = cost_eth * eth_price
    print(f"{name:<25} {gas_limit:>10,} {cost_eth:>12.6f} ${cost_usd:>9.2f}")
EOF

Historical Gas Analysis

python3 << 'EOF'
import requests

# Get last 100 blocks fee history
resp = requests.post('https://eth.llamarpc.com', json={
    'jsonrpc': '2.0',
    'id': 1,
    'method': 'eth_feeHistory',
    'params': ['0x64', 'latest', [10, 50, 90]]
}).json()

result = resp['result']
base_fees = [int(x, 16) / 1e9 for x in result['baseFeePerGas']]

print("=== Last 100 Blocks Gas Analysis ===")
print(f"Minimum: {min(base_fees):.2f} Gwei")
print(f"Maximum: {max(base_fees):.2f} Gwei")
print(f"Average: {sum(base_fees)/len(base_fees):.2f} Gwei")
print(f"Current: {base_fees[-1]:.2f} Gwei")

# Find optimal times (lowest gas)
sorted_fees = sorted(enumerate(base_fees), key=lambda x: x[1])
print("\n=== Lowest Gas Periods ===")
for idx, fee in sorted_fees[:5]:
    blocks_ago = len(base_fees) - idx - 1
    print(f"{blocks_ago} blocks ago: {fee:.2f} Gwei")
EOF

Gas Price Alerts

python3 << 'EOF'
import requests
import time

TARGET_GWEI = 20  # Alert when gas drops below this
CHECK_INTERVAL = 30

print(f"Waiting for gas to drop below {TARGET_GWEI} Gwei...")

while True:
    try:
        resp = requests.post('https://eth.llamarpc.com', json={
            'jsonrpc': '2.0',
            'id': 1,
            'method': 'eth_gasPrice',
            'params': []
        }).json()

        gas_gwei = int(resp['result'], 16) / 1e9

        if gas_gwei < TARGET_GWEI:
            print(f"\n🔔 ALERT! Gas is now {gas_gwei:.2f} Gwei!")
            print("Good time to transact!")
            # Add notification here (telegram, discord, etc.)
            break
        else:
            print(f"Current: {gas_gwei:.2f} Gwei (waiting for < {TARGET_GWEI})")

        time.sleep(CHECK_INTERVAL)
    except KeyboardInterrupt:
        break
EOF

L2 Gas Comparison

python3 << 'EOF'
import requests

chains = {
    'Ethereum': 'https://eth.llamarpc.com',
    'Arbitrum': 'https://arb1.arbitrum.io/rpc',
    'Optimism': 'https://mainnet.optimism.io',
    'Polygon': 'https://polygon-rpc.com',
    'Base': 'https://mainnet.base.org',
}

print("=== Gas Prices Across Chains ===\n")

for name, rpc in chains.items():
    try:
        resp = requests.post(rpc, json={
            'jsonrpc': '2.0',
            'id': 1,
            'method': 'eth_gasPrice',
            'params': []
        }, timeout=5).json()

        gas_gwei = int(resp['result'], 16) / 1e9
        print(f"{name:<12}: {gas_gwei:>10.4f} Gwei")
    except Exception as e:
        print(f"{name:<12}: Error")
EOF

Best Times to Transact

Gas Tokens

Notes

• Gas prices fluctuate with network demand
• Base fee burns, priority fee goes to validators
• EIP-1559: maxFeePerGas = baseFee + priorityFee
• Use Flashbots for MEV protection
• L2s are 10-100x cheaper for most operations
• Weekend transactions typically cheaper