chain.openverbs.com
x402Grade BLast checked 51 min ago
POST https://chain.openverbs.com/v1/gas-estimate
Simulate a transaction before signing: runs `eth_estimateGas` for `{ to, from?, data?, value? }` and returns the estimated gas units and estimated fee (current gas price x gas, in wei + ETH). If the node rejects the call it returns `ok:false` with the decoded `revertReason` (why it would fail) instead of erroring. Reads live on-chain state with automatic endpoint fallback.
Price$0.004per chain read · paid in USD on Base
Uptime100%
4/4 probes · 244 ms
Score75Grade B
Paid usage, 30 days2payers · 5 calls
How to buy
This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.
curl -i -X POST "https://chain.openverbs.com/v1/gas-estimate"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the responseRecent checks
| Checked (UTC) | Result | Status | Time | Live price |
|---|---|---|---|---|
| 2026-10-11 11:01 | Valid 402 | 402 | 499 ms | $0.004 |
| 2026-10-11 06:31 | Valid 402 | 402 | 220 ms | $0.004 |
| 2026-10-11 02:00 | Valid 402 | 402 | 268 ms | $0.004 |
| 2026-10-10 21:30 | Valid 402 | 402 | 174 ms | $0.004 |
Receipts
No test purchases yet. Graded test purchases are next on our list; until then every number here comes from unpaid checks.
What a check proves