Discover / x402-demo-production-19f3.up.railway.app

x402-demo-production-19f3.up.railway.app

■ Challenge detected

x402 Agent payment proof of concept

x402
Base
USDC

Listed price: $0.01
Challenge detected: 8 of the last 8 checks
Median response: 281 ms
Last checked: 16 Oct, 18:49 UTC
In our index since: 6 Oct 2026

Endpoint

curl -i https://x402-demo-production-19f3.up.railway.app/demo
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

1 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

GEThttps://x402-demo-production-19f3.up.railway.app/demo$0.01x402 Agent payment proof of concept

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 1 of 1 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/x402-demo-production-19f3.up.railway.app

Recent checks

6 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026

All 8 checks

When (UTC)	Result	HTTP	Response
16 Oct, 18:49 UTC	Challenge detected	402	308ms
15 Oct, 11:37 UTC	Challenge detected	402	268ms
14 Oct, 00:19 UTC	Challenge detected	402	294ms
11 Oct, 22:04 UTC	Challenge detected	402	264ms
10 Oct, 06:39 UTC	Challenge detected	402	331ms
9 Oct, 00:47 UTC	Challenge detected	402	255ms
7 Oct, 21:31 UTC	Challenge detected	402	352ms
6 Oct, 16:01 UTC	Challenge detected	402	262ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 18:49 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for x402-demo-production-19f3.up.railway.app?

Its listed price is $0.01.

What payment terms does x402-demo-production-19f3.up.railway.app advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is x402-demo-production-19f3.up.railway.app listed?

In x402 Bazaar. Superstables first indexed it on 6 Oct 2026.

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