Simulate a transaction before signing: runs `eth_estimateGas` for `{ to, from?, ...
https://chain.openverbs.com/v1/gas-estimateOverview
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.
Protocol
x402 (POST)
Price
$0.0040
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
crypto/transactions
Provider
chain
Source
bazaar
Indexed
2026-09-13 14:13:48
Health
Status
healthy
Latency (p50)
758ms
Uptime (30d)
100.0%
Reliability Score
90/100
Last Checked
2026-10-31 07:12:24
Last Healthy
2026-10-31 07:12:24
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Input Schema
{
"body": {
"chain": "ethereum",
"to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"value": "1000000000000000"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}