x402 census · coinflip402.vercel.app · 64e28dde9a24 · JSON

GET /api/coinflip

live

Flip a coin for a small USDC payment on Base mainnet. Returns heads or tails.

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

Facts from the catalogs

Field Value

URL https://coinflip402.vercel.app/api/coinflip

Method GET

Price $0.001 USDC = 1000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0xb8c578e039Aa2c44dd3dEc48E6875ba5763CD67f

Seller coinflip402.vercel.app

Catalogs cdp (row updated 2026-09-30)

Listed since (lower bound) 2026-09-30 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-30

CDP quality counters 96 calls and 63 unique payers in 30 days, last call 2026-09-30 (catalog-reported, not verified on chain)

Category (keyword rule) crypto-data

Templated path no

x402Version in catalog 2

Service name / tags Coin Flip · game, random, fun

Unpaid probe (census of 2026-09-30)

Field Value

Probed at 2026-09-30T23:12:04.568Z

HEAD 402

GET 402

Verdict live live: valid 402 to an unpaid GET

402 carried in header

x402Version in the 402 2

accepts[0] {"scheme":"exact","network":"eip155:8453","amount":"1000","payTo":"0xb8c578e039Aa2c44dd3dEc48E6875ba5763CD67f","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 / none

Latency 5,770 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 19

Payments 118

USDC volume $0.12

Median payment $0.001

First / last payment 2026-07-15 / 2026-09-19

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0xb8c578e039Aa2c44dd3dEc48E6875ba5763CD67f (contract)

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "pathParams": {},
  "queryParams": {},
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "message": "You flipped a coin and got heads!",
   "result": "heads",
   "timestamp": "2026-09-30T01:09:17.605Z"
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://coinflip402.vercel.app/api/coinflip' -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/64e28dde9a24/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"64e28dde9a24"} 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 coinflip402.vercel.app.