Agent Exchange x402 census and directory

x402 census · stall-row-production.up.railway.app · d5f81dc8913c · JSON

POST /v1/card-smith

method-gated

Generate or grade an agent card (the /.well-known/agent-card.json an agent publishes for A2A and AgentWorld-style registries). Generate builds a structurally valid card from your fields; grade scores a supplied card and itemizes its defects. Use this when you are registering an agent and want the card right the first time.

Verdict: not verified by an unpaid GET. 405/400: the 402 sits behind the declared method. This says nothing about whether the route works when called as declared.

Facts from the catalogs

FieldValue
URLhttps://stall-row-production.up.railway.app/v1/card-smith
MethodPOST
Price$0.10 USDC = 100000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Networkeip155:8453 (base)
payTo0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F
Sellerstall-row-production.up.railway.app
Catalogscdp (row updated 2026-10-25)
Listed since (lower bound)2026-10-25 (earliest catalog timestamp; catalogs report last-update times only)
Last catalog update2026-10-25
CDP quality counters3 calls and 2 unique payers in 30 days, last call 2026-10-25 (catalog-reported, not verified on chain)
Category (keyword rule)dev-tools/utilities
Templated pathno
x402Version in catalog2
Service name / tagsstall-row · agents, a2a, agent-card, identity, sellers

Unpaid probe (census of 2026-10-25)

FieldValue
Probed at2026-10-25T21:14:04.500Z
HEAD405
GET405
Verdictmethod-gated 405/400: the 402 sits behind the declared method
402 carried inn/a
x402Version in the 402n/a
accepts[0]none
Live amount equals catalog pricenot comparable
Live payTo equals catalog payTonot comparable
extensions.bazaar in the 402no
PAYMENT-REQUIRED headerno
WWW-Authenticate offernone
Content type / server / CORSapplication/json / railway-hikari / none
Latency120 ms
Errornone

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)

FieldValue
Settlement historyunresolved: payTo not seen in the payer forensics (180 wallets' outbound history) or the Blockscout sample

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "description": "Research agent",
   "mode": "generate",
   "name": "Ren",
   "skills": [
    "research"
   ]
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "card": {
    "description": "Research agent",
    "name": "Ren",
    "skills": [],
    "url": "",
    "version": "1.0.0"
   },
   "mode": "generate",
   "validation": {
    "defects": [
     {
      "detail": "Top-level 'url' is absent or empty.",
      "name": "missing url",
      "severity": "major"
     }
    ],
    "score": 55,
    "valid_structure": false
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://stall-row-production.up.railway.app/v1/card-smith' -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/d5f81dc8913c/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"d5f81dc8913c"} 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 stall-row-production.up.railway.app.