Discover / agent-sign-guard-main-production.up.railway.app

agent-sign-guard-main-production.up.railway.app

□ No challenge detected

Deterministic pre-sign risk screening for unsigned Base EVM transactions. Detects ERC20 transfers, token approvals, unlimited approvals, setApprovalForAll, malformed calldata and OFAC SDN and configured address matches. Returns machine-readable ALLOW, REVIEW or BLOCK.

x402
Base Sepolia
USDC

Listed price: $0.01
Challenge detected: 0 of the last 9 checks
Last checked: 16 Oct, 23:40 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://agent-sign-guard-main-production.up.railway.app/risk-check
# 402 Payment Required: pay with an x402 client (USDC on Base Sepolia),
# 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.

POSThttps://agent-sign-guard-main-production.up.railway.app/risk-checkNo price listedDeterministic pre-sign risk screening for unsigned Base EVM transactions. Detects ERC20 transfers, token approvals, unlimited approvals, setApprovalForAll, malformed calldata and OFAC SDN and configured address matches. Returns machine-readable ALLOW, REVIEW or BLOCK.

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/agent-sign-guard-main-production.up.railway.app

Recent checks

30 Sept 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 9 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	No challenge detected	404	227ms
15 Oct, 14:11 UTC	No challenge detected	404	134ms
14 Oct, 00:19 UTC	No challenge detected	404	157ms
12 Oct, 00:34 UTC	No challenge detected	404	155ms
10 Oct, 10:04 UTC	No challenge detected	404	162ms
9 Oct, 03:33 UTC	No challenge detected	404	142ms
7 Oct, 21:31 UTC	No challenge detected	404	161ms
6 Oct, 16:01 UTC	No challenge detected	404	130ms
30 Sept, 05:03 UTC	No challenge detected	404	105ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 16 Oct, 23:40 UTC, we detected no payment challenge.

What price is recorded for agent-sign-guard-main-production.up.railway.app?

Its listed price is $0.01.

What payment terms does agent-sign-guard-main-production.up.railway.app advertise?

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

Where is agent-sign-guard-main-production.up.railway.app listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

Something wrong on this page? Tell us.