Gas Price Monitor

Track real-time gas prices across 8 EVM chains. Get alerts when prices spike or drop, helping you optimize transaction timing and costs.

What is a Gas Price Monitor?

A Gas Price Monitor tracks the current gas price on EVM-compatible blockchains. It alerts you when gas exceeds a high threshold (expensive) or drops below a low threshold (cheap).

Why Monitor Gas Prices?

Cost Optimization: Save 50-90% by transacting during low gas periods
User Experience: Alert users when gas is cheap for better UX
Automated Trading: Pause bots during high gas to avoid losses
Budget Control: Prevent unexpected cost overruns

Supported Chains (8 EVM)

Chain	Avg Gas	High Alert	Low Alert
Ethereum	15-30 Gwei	>50 Gwei	<10 Gwei
Polygon	30-100 Gwei	>200 Gwei	<20 Gwei
BSC	3-5 Gwei	>10 Gwei	<2 Gwei
Arbitrum	0.1-0.5 Gwei	>1 Gwei	<0.05 Gwei
Optimism	0.001-0.01 Gwei	>0.05 Gwei	<0.001 Gwei
Base	0.001-0.01 Gwei	>0.05 Gwei	<0.001 Gwei
Avalanche	25-50 nAVAX	>100 nAVAX	<20 nAVAX
Fantom	20-50 Gwei	>100 Gwei	<10 Gwei

Configuration Options

Basic Configuration

Field	Description	Example
Name	Human-readable identifier	Ethereum Gas Price
Chain	Blockchain to monitor	Ethereum, Polygon, BSC, etc.
RPC URL	RPC endpoint (optional)	https://eth.llamarpc.com
High Threshold	Alert if gas > X Gwei	100 Gwei (Ethereum)
Low Threshold	Alert if gas < X Gwei	10 Gwei (Ethereum)
Interval	Check frequency	30s, 1m, 5m

Configuration Examples

Ethereum Mainnet - Basic

{
  "type": "gas_price",
  "name": "Ethereum Gas Tracker",
  "chain": "ethereum",
  "gasAlertOnHigh": true,
  "gasThresholdHighGwei": 100,
  "gasAlertOnLow": true,
  "gasThresholdLowGwei": 10,
  "interval": 60000
}

Polygon - High Gas Only

{
  "type": "gas_price",
  "name": "Polygon Gas Spikes",
  "chain": "polygon",
  "gasAlertOnHigh": true,
  "gasThresholdHighGwei": 200,
  "gasAlertOnLow": false,
  "interval": 60000
}

Arbitrum - Low Gas Alerts

{
  "type": "gas_price",
  "name": "Arbitrum Cheap Gas",
  "chain": "arbitrum",
  "gasAlertOnHigh": false,
  "gasAlertOnLow": true,
  "gasThresholdLowGwei": 0.05,
  "interval": 300000
}

Multi-Chain Monitoring

// Create separate monitors for each chain
[
  { "chain": "ethereum", "gasThresholdHighGwei": 100 },
  { "chain": "polygon", "gasThresholdHighGwei": 200 },
  { "chain": "bsc", "gasThresholdHighGwei": 10 },
  { "chain": "arbitrum", "gasThresholdHighGwei": 1 }
]

Alert Conditions

High Gas Alert

Triggers when current gas price exceeds high threshold:

🚨 High Gas Alert

Chain: Ethereum
Current Gas: 125 Gwei
Threshold: 100 Gwei
Status: Above threshold (+25%)

Recommendation: Delay non-urgent transactions

Low Gas Alert

Triggers when current gas price drops below low threshold:

✅ Low Gas Alert

Chain: Ethereum
Current Gas: 8 Gwei
Threshold: 10 Gwei
Status: Below threshold (-20%)

Recommendation: Good time for transactions

Use Cases

1. NFT Minting Optimization

Alert collectors when gas is cheap:

Monitor: Ethereum Gas Price
Low Threshold: 15 Gwei
Alert Channel: Discord (#gas-alerts)

Notification: "⛽ Gas dropped to 12 Gwei! Good time to mint."

2. Automated Trading Bot

Pause bot during high gas to avoid unprofitable trades:

Monitor: Ethereum Gas Price
High Threshold: 50 Gwei
Webhook: https://api.bot.com/pause

Action: POST to webhook when gas > 50 Gwei → pause bot

3. DeFi Protocol Cost Control

Alert when harvest/compound costs exceed profitability:

Monitor: Polygon Gas Price
High Threshold: 300 Gwei
Alert: "High gas detected. Harvest costs may exceed rewards."

4. User Notification Service

Notify users via email when gas is cheap:

Monitor: Ethereum Gas Price
Low Threshold: 10 Gwei
Email Channel: user-notifications@example.com

Subject: "⛽ Ethereum gas at 8 Gwei - Time to transact!"

Best Practices

1. Set Chain-Specific Thresholds

Don't use the same thresholds across chains:

Ethereum: 50-100 Gwei (L1 is expensive)
Polygon: 100-200 Gwei (spikes are common)
Arbitrum/Optimism: 0.1-1 Gwei (L2 is cheap)

2. Check Every 30-60 Seconds

Gas prices can change rapidly:

30s interval: For high-frequency trading
1m interval: For most use cases
5m interval: For low-priority monitoring

3. Use Historical Data

Study gas patterns before setting thresholds:

Check Etherscan Gas Tracker
Use 90th percentile for high alerts
Use 10th percentile for low alerts

4. Combine with Time-Based Logic

Gas prices follow daily patterns:

Weekdays 2-6 PM EST: Highest gas (US market hours)
Weekends: Lower gas (less activity)
Late night UTC: Often cheapest

5. Monitor Multiple Chains

Compare costs across chains for multi-chain apps:

Ethereum: 80 Gwei ($12 per tx)
Polygon: 150 Gwei ($0.02 per tx)
Arbitrum: 0.3 Gwei ($0.10 per tx)

→ Route transactions to Arbitrum

Gas Price vs Transaction Cost

Calculating Transaction Cost

Cost = Gas Price × Gas Limit × ETH Price

Example:
Gas Price: 50 Gwei
Gas Limit: 21,000 (simple transfer)
ETH Price: $2,000

Cost = 50 × 21,000 × 2,000 / 1,000,000,000
     = $2.10

Typical Gas Limits

Action	Gas Limit	Cost @ 50 Gwei
ETH Transfer	21,000	$2.10
ERC-20 Transfer	65,000	$6.50
Uniswap Swap	150,000	$15.00
NFT Mint	100,000	$10.00
Complex DeFi	500,000	$50.00

Troubleshooting

Gas Price Showing 0.0 Gwei

Possible Causes:

RPC node is down
Chain is not supported
Network connectivity issue

Solution:

Verify chain is in supported list
Test RPC manually: curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":1}' RPC_URL
Try different RPC provider

Alerts Not Triggering

Possible Causes:

Thresholds set incorrectly
Alert channels not configured
Monitor is silenced

Solution:

Verify thresholds match chain's gas range
Test alert channel manually
Check monitor is not in maintenance mode

Next Steps

Whale Wallet Monitor: Track large transactions
Web3 Monitors Overview: Explore other Web3 monitor types
Configure Alert Rules for gas price conditions
Set up Integrations for notifications