https://arbitrum-mpp-transaction-preflight-production.up.railway.app/x402/v1/preflightGET /x402/v1/preflight · x402 API by arbitrum-mpp-transaction-preflight-production

https://arbitrum-mpp-transaction-preflight-production.up.railway.app/x402/v1/preflight

What does this x402 API do?

https://arbitrum-mpp-transaction-preflight-production.up.railway.app/x402/v1/preflight. This is an x402-gated GET API resource from arbitrum-mpp-transaction-preflight-production. The latest safe exact-route check returned HTTP 404 on 2026-08-05. No normalized USD price is recorded; the listing names eip155:42161. No settled paid call has been verified.

Published price: No normalized USD price is recorded
Networks: eip155:42161
Latest evidence: The latest safe exact-route check returned HTTP 404 on 2026-08-05
Resource ID: 7dce4014cc6659175beef804

USE THIS RESOURCE

Start with a quote-only recipe. Payment signing stays in your project.

CODE

AI CODING TOOLS

quote-check.ts

const response = await fetch("https://arbitrum-mpp-transaction-preflight-production.up.railway.app/x402/v1/preflight", {
  method: "GET",
});

console.log(response.status);
console.log(Object.fromEntries(response.headers));
console.log((await response.text()).slice(0, 1000));

// A valid 402 is a quote, not a completed paid call.

This sends no payment. Inspect the 402 response before adding a wallet-enabled client.

JSON ↗developer docs →

STATUS HISTORY

JSON RSS

Observed in 402-index2026-08-05 04:23 UTC
Discovered through bazaar.
Exact route checked2026-08-05 02:58 UTC
non 402
Origin reachable2026-08-05 02:57 UTC
HEAD https://arbitrum-mpp-transaction-preflight-production.up.railway.app/ returned 200.
Registry record checked2026-08-05 02:14 UTC
Registry health: degraded.

What evidence supports this listing?

402-indexobserved 2026-08-05 · open source record ↗

origin checkHEAD https://arbitrum-mpp-transaction-preflight-production.up.railway.app/ → 200 on 2026-08-05

route quoteGET returned 404; no x402 quote was confirmed · 2026-08-05

Each record has an exact-route quote outcome. Unresolved templates and potentially mutating methods are labeled instead of being invoked without provider-specific test input. A quote is still separate from a settled paid call. Read the discovery and verification methodology →

Which networks and payment options does it accept?

The normalized listing price is No normalized USD price is recorded. Raw protocol requirements remain visible below for implementation and audit use.

The registry did not expose full payment options for this record.