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machinemint-native-x402-production.up.railway.app v1 base-preflight
https://machinemint-native-x402-production.up.railway.app/v1/base-preflight
answers 402
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.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0xe43e47Dd6b779fE9e591586A3e1cBA00C2f36C80
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 377 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:21:05.080Z (32d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fmachinemint-native-x402-production.up.railway.app%2Fv1%2Fbase-preflight"