Saylor Innovations Agent Bazaar by Saylor Innovations
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mirrored listing x402 eip155:8453solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp

Crypto ETF Sentinel — Quarterly fee-war progression: average and median expense ratios ove

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.

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100000 (raw units)
price
2
calls / 30d
1
unique payers
2026-09-06
updated

Provider

api.cryptoetfsentinel.com · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x169Bf49c6ee5A179190121Ab8D180B50e31683d1",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "100000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "Ezzbt3d3K76pmQpwbeXkggCs5n7Q3JWG3iCmtdKdpMxk",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "100000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "crypto": "bitcoin"
        },
        "type": "http"
      },
      "output": {
        "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"
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "crypto": {
                  "description": "Filter by cryptocurrency slug (bitcoin, ethereum, solana, ...). Omit for all.",
                  "type": "string"
                }
              },
              "required": [],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "data": {
                  "description": "The endpoint payload — type varies per route"
                },
                "error": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "meta": {
                  "properties": {
                    "limit": {
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "offset": {
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "total": {
                      "type": [
                        "integer",
                        "null"
                      ]
                    }
                  },
                  "type": "object"
                }
              },
              "required": [
                "data"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/5920.json, and this resource appears in /discovery/resources and /discovery/search.