api.onesource.io
x402Grade BLast checked 3 hours ago
POST https://api.onesource.io/api/chain/estimate-gas
Estimate the gas a transaction will consume via eth_estimateGas before signing it
Price$0.004per chain read · paid in USD on Base
Uptime100%
4/4 probes · 198 ms
Score83Grade B
Paid usage, 30 days250payers · 250 calls
Warnings
Few repeat buyers Most payers called it only once, a pattern typical of crawlers or volume farming, so its usage counts half.
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://api.onesource.io/api/chain/estimate-gas"
# 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 07:45 | Valid 402 | 402 | 78 ms | $0.004 |
| 2026-10-11 03:30 | Valid 402 | 402 | 300 ms | $0.004 |
| 2026-10-10 23:00 | Valid 402 | 402 | 96 ms | $0.004 |
| 2026-10-10 17:15 | Valid 402 | 402 | 323 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