Discover / umpire.vimabrosta.com

Umpire

□ No challenge detected

A neutral third party for agent commerce. Buy an Ed25519 signed pass or fail verdict on a deliverable against a machine readable acceptance spec (JSON Schema, JSON path, content hash, regex, length, live URL probe), verifiable offline by anyone against a published key. The witness tier ($0.25) fetches one public URL and signs what it saw (final URL, status, resolved address, TLS fingerprint, headers, body sha256) as proof against agent false success. Also sells reputation reads on merchant walle

x402
Base
Solana
USDC
Verification

Challenge detected: 7 of the last 10 checks
Median response: 82 ms
Last checked: 16 Oct, 23:40 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://umpire.vimabrosta.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/umpire.vimabrosta.com

Recent checks

27 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 10 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	No challenge detected	200	176ms
15 Oct, 17:07 UTC	No challenge detected	200	55ms
14 Oct, 08:45 UTC	No challenge detected	200	104ms
13 Oct, 00:46 UTC	Challenge detected	402	68ms
11 Oct, 06:02 UTC	Challenge detected	402	81ms
9 Oct, 21:31 UTC	Challenge detected	402	120ms
8 Oct, 15:35 UTC	Challenge detected	402	117ms
7 Oct, 09:33 UTC	Challenge detected	402	64ms
6 Oct, 09:33 UTC	Challenge detected	402	167ms
27 Sept, 17:02 UTC	Challenge detected	402	82ms

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 Umpire advertise?

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

Where is Umpire listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 26 Sept 2026.

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