x402 census · verifier.quantumshieldlabs.dev · 1140a18ef547 · JSON

POST /x402/preflight

unprobed

Return an advisory ALLOW, DENY, or ESCALATE decision by comparing a bounded action request with authority, constraints, and evidence supplied by the caller. The service does not execute or legally authorize the action, access a wallet, validate identity, or independently observe facts.

Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.

Facts from the catalogs

Field Value

URL https://verifier.quantumshieldlabs.dev/x402/preflight

Method POST

Price $0.005 USDC = 5000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0x550205ECa42aAE871CFED6BC943fB2cF59F1d057

Seller verifier.quantumshieldlabs.dev

Catalogs cdp (row updated 2026-09-25)

Listed since (lower bound) 2026-09-25 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-25

CDP quality counters 1 calls and 1 unique payers in 30 days, last call 2026-09-25 (catalog-reported, not verified on chain)

Category (keyword rule) dev-tools/utilities

Templated path no

x402Version in catalog 2

Service name / tags none

Unpaid probe (census of )

Field

Value

Probe

not probed in this build

No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.

On-chain facts for the payTo (public address)

Field Value

Distinct payers 2

Payments 2

USDC volume $0.10

Median payment $0.05

First / last payment 2026-09-17 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x550205ECa42aAE871CFED6BC943fB2cF59F1d057

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "action_type": "purchase",
   "authority_scope": {
    "allowed_action_types": [
     "purchase"
    ],
    "denied_action_types": [
     "withdraw"
    ],
    "human_approval_action_types": [
     "transfer"
    ]
   },
   "constraints": {
    "max_spend_usd": "5.00",
    "prohibited_destinations": [
     "blocked-market.example"
    ],
    "required_evidence": [
     "inventory_check"
    ]
   },
   "evidence_items": [
    {
     "name": "inventory_check",
     "result": true
    }
   ],
   "operation_id": "purchase-42",
   "requested_action": {
    "description": "Buy an approved test asset",
    "destination": "approved-market.example",
    "spend_usd": "4.50"
   }
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
 },
 "output": {
  "type": "json",
  "example_truncated": true,
  "chars": 522
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://verifier.quantumshieldlabs.dev/x402/preflight' -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/1140a18ef547/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"1140a18ef547"} 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 verifier.quantumshieldlabs.dev.