← All endpoints
amnt.io os-tools tx-preflight
https://www.amnt.io/api/os-tools/tx-preflight
answers 402
Tx Preflight - Simulate a transaction before you sign it and get a safe / warn / danger verdict.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0x98fa9c8afb5c56ad27d24843cabebdd55170dbc0
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 147 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:14:02.394Z (23d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fwww.amnt.io%2Fapi%2Fos-tools%2Ftx-preflight"