x402 census · ai-data-marketplace-1042299154756.us-central1.run.app · db6490a37e08 · JSON

GET /api/v1/tx_simulator

live

Run a read-only transaction simulation with eth_call and eth_estimateGas against a supported public EVM RPC without signing or broadcasting.

Verdict: live. The unpaid GET reached a valid 402. The live amount equals the catalog price.

Facts from the catalogs

Field Value

URL https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/tx_simulator

Method GET

Price $0.005 USDC = 5000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0x8647F7D7a1368a467Ad1FF757fBc2e7167973558

Seller ai-data-marketplace-1042299154756.us-central1.run.app

Catalogs cdp (row updated 2026-10-15)

Listed since (lower bound) 2026-10-15 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-10-15

CDP quality counters 8 calls and 4 unique payers in 30 days, last call 2026-10-15 (catalog-reported, not verified on chain)

Category (keyword rule) crypto-data

Templated path no

x402Version in catalog 2

Service name / tags DopamineDesk AI Marketplace · simulation, security, crypto, evm, developer

Unpaid probe (census of 2026-10-22)

Field Value

Probed at 2026-10-22T00:24:53.325Z

HEAD 402

GET 402

Verdict live live: valid 402 to an unpaid GET

402 carried in header+body

x402Version in the 402 2

accepts[0] {"scheme":"exact","network":"eip155:8453","amount":"5000","payTo":"0x8647F7D7a1368a467Ad1FF757fBc2e7167973558","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}}

Live amount equals catalog price yes

Live payTo equals catalog payTo yes

extensions.bazaar in the 402 yes

PAYMENT-REQUIRED header yes

WWW-Authenticate offer none

Content type / server / CORS application/json / Google Frontend / *

Latency 136 ms

Error Payment Required

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 9

Payments 26

USDC volume $0.29

Median payment $0.01

First / last payment 2026-08-24 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x8647F7D7a1368a467Ad1FF757fBc2e7167973558

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "queryParams": {
   "data": "0x313ce567",
   "from": "0x8647F7D7a1368a467Ad1FF757fBc2e7167973558",
   "network": "base",
   "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "value": "0"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "broadcast": false,
   "estimated_gas": "30958",
   "marketplace_metadata": {
    "availability": "operational",
    "billable": true,
    "data_mode": "live_source",
    "source": "public EVM JSON-RPC"
   },
   "network": "base",
   "return_data": "0x0000000000000000000000000000000000000000000000000000000000000006",
   "simulation_status": "SUCCESS",
   "source": "base public JSON-RPC",
   "success": true
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/tx_simulator' -H 'accept: application/json'

The catalog declares GET. 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/db6490a37e08/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"db6490a37e08"} 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 ai-data-marketplace-1042299154756.us-central1.run.app.