x402 census · api.hyperextend.xyz · 1927a6484ecf · JSON

GET /v1/outcome/100/oi

live

Derived two-sided open interest for a HIP-4 outcome market, per minute (circulating-supply times mark, summed over both sides). Priced per row ($0.000025 premium); served live. Takes the integer outcome id (e.g. 100).

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

Facts from the catalogs

Field Value

URL https://api.hyperextend.xyz/v1/outcome/100/oi

Method GET

Price $0.13 USDC = 125725 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base); also accepts hyperliquid:mainnet

payTo 0x548fC289526ab2F0391D562a723cdA64Bbf1abc4

Seller api.hyperextend.xyz

Catalogs cdp (row updated 2026-10-20)

Listed since (lower bound) 2026-10-20 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-10-20

CDP quality counters 4 calls and 4 unique payers in 30 days, last call 2026-10-20 (catalog-reported, not verified on chain)

Category (keyword rule) crypto-data

Templated path no

x402Version in catalog 2

Service name / tags hyperextend · hyperliquid, market-data, candles, open-interest, hip-3

Unpaid probe (census of 2026-10-22)

Field Value

Probed at 2026-10-22T00:30:49.749Z

HEAD 405

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":"125725","payTo":"0x548fC289526ab2F0391D562a723cdA64Bbf1abc4","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":60,"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 / uvicorn / none

Latency 522 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 14

Payments 38

USDC volume $0.33

Median payment $0.0019

First / last payment 2026-05-31 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x548fC289526ab2F0391D562a723cdA64Bbf1abc4 (contract: CoinbaseSmartWallet)

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "queryParams": {
   "end": 0,
   "limit": 5000,
   "start": 0
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "minute_ts": 1700000000,
   "oi_notional": "12345.6",
   "sides": 2
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://api.hyperextend.xyz/v1/outcome/100/oi' -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/1927a6484ecf/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"1927a6484ecf"} 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 api.hyperextend.xyz.