machinemint-native-x402-production.up.railway.app
x402Grade BLast checked 2 hours ago
GET https://machinemint-native-x402-production.up.railway.app/v1/base-preflight
Check an unsigned Base mainnet transaction before signing or broadcasting. Simulates with eth_call, estimates gas, checks sender balance and target bytecode, decodes supported token transfers and approvals, flags unlimited approvals and suspicious transaction shapes, and returns PASS, REVIEW, or FAIL. Never signs or broadcasts.
Price$0.01per chain read · paid in USD on Base
Uptime100%
5/5 probes · 612 ms
Score77Grade B
Paid usage, 30 days4payers · 4 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 GET "https://machinemint-native-x402-production.up.railway.app/v1/base-preflight"
# 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 12:31 | Valid 402 | 402 | 521 ms | $0.01 |
| 2026-10-11 08:00 | Valid 402 | 402 | 1849 ms | $0.01 |
| 2026-10-11 03:45 | Valid 402 | 402 | 411 ms | $0.01 |
| 2026-10-10 23:15 | Valid 402 | 402 | 612 ms | $0.01 |
| 2026-10-10 17:45 | Valid 402 | 402 | 792 ms | $0.01 |
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