Discover / x402-discovery.nishvault.com

Nishvault x402 Pre-Send Guard

□ No challenge detected

0.01 USDC on Base for pre-send EVM transaction simulation for AI agents. Returns an x402 v2 challenge and, after payment, a preflight result and proof receipt; never broadcasts the transaction.

x402
Base
USDC
Verification

Challenge detected: 0 of the last 3 checks
Last checked: 16 Oct, 23:40 UTC
In our index since: 14 Oct 2026

Endpoint

curl -i https://x402-discovery.nishvault.com
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/x402-discovery.nishvault.com

Recent checks

14 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 3 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	No challenge detected	530	167ms
15 Oct, 17:07 UTC	No challenge detected	530	426ms
14 Oct, 08:45 UTC	No challenge detected	530	49ms

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 payment terms does Nishvault x402 Pre-Send Guard advertise?

The listing advertises x402, Base and USDC. Check the seller's current payment challenge and authentication requirements before paying.

Where is Nishvault x402 Pre-Send Guard listed?

In x402-list.com. Superstables first indexed it on 14 Oct 2026.

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