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arbitrum-mpp-transaction-preflight-production.up.railway.app v1 preflight
https://arbitrum-mpp-transaction-preflight-production.up.railway.app/x402/v1/preflight
payable
Simulate and risk-score an Arbitrum transaction before signing.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- 100000 atomic
- Network
- arbitrum
- Pay to
- 0x20CEFA1804905878458390e6B6719c4b1d45a0B7
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 354 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:13:10.958Z (1d ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Farbitrum-mpp-transaction-preflight-production.up.railway.app%2Fx402%2Fv1%2Fpreflight"