x402 census · 402.com.tr · 39851a8528bf · JSON

GET /api/x402/b20-permit

live

🆕 Every B20 has ERC-2612 permit built in — approve a spender by signature instead of a transaction. Reads exactly what an agent needs to build a valid permit: the token's DOMAIN_SEPARATOR, the owner's current nonce (so the signed payload can't be rejected/replayed), and the EIP-712 domain/type struct. Read-only — signs nothing.

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

Facts from the catalogs

Field Value

URL https://402.com.tr/api/x402/b20-permit

Method GET

Price $0.03 USDC = 30000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0x973a31858f4d2125f48c880542da11a2796f12d6

Seller 402.com.tr

Catalogs cdp (row updated 2026-09-19)

Listed since (lower bound) 2026-09-19 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-19

CDP quality counters 2 calls and 2 unique payers in 30 days, last call 2026-09-19 (catalog-reported, not verified on chain)

Category (keyword rule) chain-rpc

Templated path no

x402Version in catalog 2

Service name / tags B20 Permit Inspector · b20, base-token-standard, freeze, seize, token-safety

Unpaid probe (census of 2026-09-30)

Field Value

Probed at 2026-09-30T23:52:31.147Z

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":"30000","payTo":"0x973a31858f4d2125f48c880542da11a2796f12d6","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 / Vercel / *

Latency 2,176 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 25

Payments 34

USDC volume $0.66

Median payment $0.02

First / last payment 2026-06-28 / 2026-09-30

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x973a31858f4d2125f48c880542da11a2796f12d6 (contract)

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "pathParams": {},
  "queryParams": {
   "address": "0xb20000000000000000000186a08e781c38059eec",
   "owner": "0x973a31858f4d2125f48c880542da11a2796f12d6"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "address": "0xb20000000000000000000186a08e781c38059eec",
   "checkedAt": "2026-09-10T03:01:08.790Z",
   "domainSeparator": "0xd4f8bd427e9fce6ac90676c1dbd0a5db5284c1397afa4e5e4a76925c5baac692",
   "isB20": true,
   "nonce": "0",
   "owner": "0x973A31858f4D2125f48C880542DA11a2796f12D6",
   "supportsPermit": true
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://402.com.tr/api/x402/b20-permit' -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/39851a8528bf/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"39851a8528bf"} 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 402.com.tr.