Blocknative API shutting down June 19, 2026 — drop-in replacement available

[cmdenney]

Hi @dewindtk,

I noticed this repo uses Blocknative (found in zk_sync_bot.js) — heads up that Blocknative was acquired by Deloitte and their gas estimation API is shutting down on June 19, 2026.

I run LogicNodes and we serve a drop-in replacement endpoint with the identical response schema, live today.

Migration is one line — swap the host, delete the auth header:

// Before (Blocknative — stops responding June 19, 2026)
const res = await fetch('https://api.blocknative.com/gasprices/blockprices?chainid=1', {
  headers: { Authorization: BN_API_KEY }
});

// After (LogicNodes — same fields, no auth header)
const res = await fetch('https://logicnodes.io/gasprices/blockprices?chainid=1');

// Same shape either way:
// blockPrices[0].estimatedPrices -> { confidence, price, maxPriorityFeePerGas, maxFeePerGas }

The honest details:

• Free: 100 calls/day per IP — no key, no signup, no card
• Past that: $0.001/call via x402 USDC on Base (still no signup), or an API key
• Chains served today: Ethereum (1), Polygon (137), Base (8453), Arbitrum (42161), Optimism (10) — that's all five; if you need another chain, reply and I'll prioritize it
• Data is plain eth_feeHistory 100-block percentile analysis, not a proprietary black box — confidence levels 99/95/90/80/70 map to reward percentiles

Migration page with live demo: https://logicnodes.io/blocknative
Code-level migration guide (request/response mapping, what differs): https://dev.to/cmdenney/migrating-off-blocknatives-gas-api-before-june-19-a-code-level-guide-4cbb

Happy to help with migration questions — just reply here. If this issue isn't useful, close it and I won't post again.

— Conner @ LogicNodes (DENNEYTRADINGCO LLC, AZ)