x402 census · saylorinnovations.com · 323e97c124da · JSON

GET /api/evm/ethereum/nft-owner/:address/1

needs-input

NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.

Verdict: not verified by an unpaid GET. 400/422: wants input before the 402. This says nothing about whether the route works when called as declared.

Facts from the catalogs

Field Value

URL https://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1

Method GET

Price $0.002 USDC = 2000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, eip155:137, eip155:42161

payTo 0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa

Seller saylorinnovations.com

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

Category (keyword rule) crypto-data

Templated path yes: contains :param or {param}; probed as listed

x402Version in catalog 2

Service name / tags · evm, ethereum, nft-owner, onchain

Unpaid probe (census of 2026-09-30)

Field

Value

Probed at

2026-09-30T23:41:18.572Z

HEAD

400

GET

400

Verdict

needs-input 400/422: wants input before the 402

402 carried in

n/a

x402Version in the 402

n/a

accepts[0]

none

Live amount equals catalog price

not comparable

Live payTo equals catalog payTo

not comparable

extensions.bazaar in the 402

PAYMENT-REQUIRED header

WWW-Authenticate offer

none

Content type / server / CORS

application/json / cloudflare / *

Latency

1,870 ms

Error

none

Latest re-probe

Field

Value

Re-probed at

2026-10-01T06:13:18.000Z (cron)

Verdict now

needs-input unchanged

HEAD / GET

400 / 400

accepts[0]

none

Live amount equals catalog price

not comparable

Latency

1,007 ms

Error

none

On-chain facts for the payTo (public address)

Field Value

Distinct payers 2

Payments 6

USDC volume $0.02

Median payment $0.0025

First / last payment 2026-09-27 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "pathParams": {
   "address": "EVM wallet address (0x-prefixed, 40 hex characters)"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "chain": "ethereum",
   "contract": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
   "owner": "0x4444444444444444444444444444444444444444",
   "token_id": "1"
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1' -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/323e97c124da/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"323e97c124da"} 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 saylorinnovations.com.