Blocknative

@Blocknative what are the current gas price estimates for Ethereum mainnet with 90% inclusion probability in the next block?

Based on current mempool conditions, for 90% inclusion probability in the next block on Ethereum mainnet: Base fee is estimated at 28.3 Gwei (99% confidence: 32.1 Gwei), with a priority fee of 0.8 Gwei recommended. Total estimated cost would be approximately 29.1 Gwei per gas unit. These estimates reflect mempool activity sampled within the last 15 seconds and account for typical block builder behavior.

This example demonstrates read-only gas estimation — a core use case for transaction timing decisions. Requires a valid API key with access to Ethereum mainnet. Estimates refresh every few seconds; stale data can lead to underpayment and delayed inclusion during volatile periods.

@Blocknative set up a websocket subscription to monitor transaction 0xabc123... and notify me when it confirms or drops from the mempool.

Websocket subscription configured for transaction hash 0xabc123... on Ethereum mainnet. You'll receive real-time events for: pending (mempool entry), confirmed (block inclusion), speedup (replacement detected), cancel (user-initiated drop), and dropped (evicted from mempool). Connection established at wss://api.blocknative.com/v0 with your API key. Events will stream until the transaction reaches a terminal state or the connection closes.

This example shows Blocknative's event-driven monitoring capability, useful for tracking user transactions or detecting MEV activity. Requires maintaining an active websocket connection; dropped connections lose in-flight events. Subscription scope is per-transaction — monitoring multiple hashes requires separate subscriptions or the multichain tool.

@Blocknative compare the next 5 blocks' base fee predictions across Ethereum, Polygon, and Base, then recommend the cheapest window for deploying a contract.

Analyzing base fee trajectories for the next 5 blocks: Ethereum shows a declining trend from 30 Gwei (block +1) to 26 Gwei (block +5), with 99% confidence bounds tightening after block +3. Polygon remains stable at 80-85 Gwei throughout. Base exhibits the lowest and most predictable fees at 0.02-0.03 Gwei across all blocks. Recommendation: Deploy on Base immediately for ~$0.15 total cost, or wait 3 blocks on Ethereum if mainnet deployment is required (estimated $8-9 at block +4 vs. $11 now).

This synthesis example pairs Blocknative's multi-chain gas data with reasoning about cost optimization. Demonstrates cross-chain comparison and temporal analysis. Accuracy depends on mempool volatility — sudden demand spikes (NFT mints, airdrops) can invalidate predictions within seconds. Requires API access to all three chains.

When Blocknative wins for transaction timing at protocol scale

A 6-person DeFi team building an automated market maker needs to submit transactions at optimal gas prices without overpaying or getting stuck. Blocknative's mempool filters and gas price distribution tools let them monitor pending transactions in real-time and calculate the 99% confidence base fee for the next block. The Get Gas Prices tool returns inclusion probabilities for specific time windows—critical when arbitrage opportunities close in seconds. This MCP is the right call if your protocol submits 50+ transactions daily and gas costs materially affect unit economics. If you're building a consumer app that batches transactions weekly, the complexity isn't worth it—use a simpler gas oracle. For teams optimizing MEV strategies or managing liquidation bots, Blocknative's mempool visibility justifies the API key setup and websocket handling.

Blocknative handles cross-chain monitoring for wallet teams

A 4-person wallet startup needs to show users transaction status across Ethereum, Polygon, and Arbitrum without building separate monitoring infrastructure for each chain. Blocknative's Subscribe Multichain tool generates websocket subscriptions that track a single transaction hash or address across networks with one connection. The Get Supported Chains tool dynamically discovers available networks, so adding Base or Optimism support doesn't require code changes. This MCP is ideal if your product tracks 1,000+ transactions daily across three or more chains. The threshold: if you're only monitoring Ethereum mainnet, a simple Etherscan API call is cheaper and simpler. For teams building portfolio trackers or aggregators where users expect real-time updates across L2s, Blocknative's multichain SDK eliminates the polling overhead and chain-specific quirks that slow down small teams.

When base fee estimates matter for deployment budgets

A 3-person infrastructure team at a blockchain studio deploys 15-20 smart contracts monthly for client projects and needs accurate cost forecasts before mainnet deployment. Blocknative's Get Base Fee Estimates tool returns 99% and 50% confidence predictions for the next 5 blocks, letting them schedule deployments during low-fee windows and quote clients realistic gas budgets. The Get Gas Oracles tool shows which on-chain estimators are available per network, useful when clients deploy to unfamiliar L2s. This MCP is the right call if deployment costs exceed $500 per contract and timing flexibility exists. If you're deploying once per quarter or gas is under $100, checking Etherscan manually is faster. For studios managing continuous deployment pipelines or advising clients on launch timing, Blocknative's confidence intervals turn gas estimation from guesswork into budgetable line items.