Agent Exchange x402 census and directory

x402 census · umpire.vimabrosta.com · 2fd883c4dc9c · JSON

POST /v1/verdicts/witness

live

Proof that the world changed the way your agent says it did. One live probe of a public URL against your expectation (HTTP status, keyword, CSS selector, JSON path), answered synchronously as an Ed25519 signed verdict that embeds a signed observation: final URL, resolved address, TLS certificate fingerprint, response headers, raw body sha256, timestamp. A stake free witness against false success,…

Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).

Facts from the catalogs

FieldValue
URLhttps://umpire.vimabrosta.com/v1/verdicts/witness
MethodPOST
Price$0.25 USDC = 250000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Networkeip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
payTo0xd63e74bCB00757C8fDb1817F1558ed8b97C608b6
Sellerumpire.vimabrosta.com
Catalogscdp (row updated 2026-09-03)
Listed since (lower bound)2026-09-03 (earliest catalog timestamp; catalogs report last-update times only)
Last catalog update2026-09-03
CDP quality counters1 calls and 1 unique payers in 30 days, last call 2026-09-03 (catalog-reported, not verified on chain)
Category (keyword rule)trading-signals
Templated pathno
x402Version in catalog2
Service name / tagsnone

Unpaid probe (census of )

FieldValue
Probenot probed in this build

Latest re-probe

FieldValue
Re-probed at2026-10-01T00:13:18.000Z (cron)
Verdict nowlive changed from unprobed
HEAD / GET405 / 402
accepts[0]{"scheme":"exact","network":"eip155:8453","amount":"250000","payTo":"0xd63e74bCB00757C8fDb1817F1558ed8b97C608b6","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":120,"extra":{"name":"USD Coin","version":"2"}}
Live amount equals catalog priceyes
Latency845 ms
Errornone

On-chain facts for the payTo (public address)

FieldValue
Distinct payers3
Payments8
USDC volume$0.54
Median paymentn/a
First / last payment2026-09-09 / 2026-09-24
Sampler-shaped share of paymentsn/a
Payers that are not samplersn/a
Sourceblockscout-sample — newest page of inbound ERC-20 transfers only (<=50); counts are a floor, not a total
Address0xd63e74bCB00757C8fDb1817F1558ed8b97C608b6

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "job_ref": "job-42",
   "spec": {
    "checks": [
     {
      "expect": {
       "json_path": {
        "op": "eq",
        "path": "ok",
        "value": true
       },
       "status": 200
      },
      "type": "url_probe",
      "url": "https://shop.example/health.json"
     }
    ]
   }
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "receipt": {
    "price": "$0.25"
   },
   "verdict": {
    "passed": true,
    "tier": "witness"
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://umpire.vimabrosta.com/v1/verdicts/witness' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'

The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/2fd883c4dc9c/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"2fd883c4dc9c"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on umpire.vimabrosta.com.