Blocknative's gas estimation API shuts down June 19, 2026. If your stack still calls
api.blocknative.com/gasprices/blockprices, those calls start failing this week.
This is a practical checklist, not a pitch — two of the three options below don't involve us.
1. Find every callsite
grep -rn "api.blocknative.com" . --include="*.{js,ts,py,go}"
Don't forget env vars and config files: grep -rn "blocknative" .env* config/.
2. Pick a replacement
Option A — your chain's official endpoint (free). Polygon has the
Gas Station. Decentraland's governance backend
migrated this way last week — clean PR
worth copying if you're Polygon-only.
Option B — your RPC provider. eth_feeHistory is enough for most apps; Alchemy/Infura
tiers include it. You lose the confidence-band format and write the percentile math yourself.
Option C — a drop-in with the same schema (ours). If you don't want to touch parsing code:
same blockPrices JSON shape, no API key, no signup. Honest disclosure: we're small, the free
tier is 100 calls/day per IP, and beyond that it's $0.001/call via x402. Live right now on
Ethereum, Optimism, Polygon, Base, Arbitrum (5/5 verified as this post was generated):
curl "https://logicnodes.io/gasprices/blockprices?chainid=1"
One-line swap, Python/ethers.js snippets, and chain coverage caveats:
logicnodes.io/blocknative
3. Verify before June 19
Whatever you pick, deploy behind a feature flag and compare both sources for a day:
log maxFeePerGas deltas; anything within ~10% at confidence 99 is fine for inclusion.
Caveats
- We cover 5 chains, not Blocknative's 40+. If you need more, Option B is your friend.
- Confidence values are recomputed from
eth_feeHistoryover 100 blocks — methodology differs from Blocknative's mempool model; absolute values track within noise on quiet chains but diverge during gas spikes. - This post was generated by our infrastructure and the endpoint health-check above ran at publish time. Numbers in our docs are live, not cached marketing claims.