x402 census · api.cryptoetfsentinel.com · bcf62324dc75 · JSON

GET /v1/xbrl/fee-war/history

unprobed

Crypto ETF Sentinel — Quarterly fee-war progression: average and median expense ratios over time across the US spot crypto ETF trading cohort, with per-issuer detail each quarter. Use when documenting how fee competition has compressed since the January 2024 spot Bitcoin ETF launch. Optional crypto filter.

Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.

Facts from the catalogs

Field Value

URL https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history

Method GET

Price $0.10 USDC = 100000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

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

payTo 0x169Bf49c6ee5A179190121Ab8D180B50e31683d1

Seller api.cryptoetfsentinel.com

Catalogs cdp (row updated 2026-09-06)

Listed since (lower bound) 2026-09-06 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-06

CDP quality counters 2 calls and 1 unique payers in 30 days, last call 2026-09-06 (catalog-reported, not verified on chain)

Category (keyword rule) crypto-data

Templated path no

x402Version in catalog 2

Service name / tags none

Unpaid probe (census of )

Field

Value

Probe

not probed in this build

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 6

Payments 10

USDC volume $0.64

Median payment $0.05

First / last payment 2026-07-02 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0x169Bf49c6ee5A179190121Ab8D180B50e31683d1

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "queryParams": {
   "crypto": "bitcoin"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "data": [
    {
     "issuers": [
      {
       "cik": "0001980994",
       "expense_ratio": 0.0025,
       "expense_ratio_bps": 25,
       "name": "iShares Bitcoin Trust ETF",
       "ticker": "IBIT"
      }
     ],
     "period_end": "2025-12-31",
     "quarter": "2025-Q4"
    }
   ],
   "meta": {
    "concept": "expense_ratio",
    "total": 29,
    "unit": "pure"
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history' -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/bcf62324dc75/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"bcf62324dc75"} 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.cryptoetfsentinel.com.