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api.nexismvp.com market gas-preflight
https://api.nexismvp.com/market/gas-preflight
payable
Simulate a Base mainnet transaction before submitting it — real eth_estimateGas + eth_call against the given {to, data, value}, returns whether it would succeed, estimated gas, and estimated cost. POST body required. Experimental/informational only — not financial advice.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.001
- Network
- base
- Pay to
- 0x3B59f268EbC38c5F43B8B9bE37238bf43378Ad87
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 313 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:10:02.367Z (1d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.nexismvp.com%2Fmarket%2Fgas-preflight"