service / x402-fee-war-38f394d8
Crypto Etf Sentinel API
Crypto ETF Sentinel — Crypto ETF fee comparison: current expense ratio for every trading US spot crypto ETF, sorted cheapest first — compare fees and find the lowest-cost Bitcoin, Ethereum and other crypto ETFs. Outlier-capped at 200bps to drop bad XBRL extractions.
uncertifiedrail · x402
Call card
https://api.cryptoetfsentinel.com/v1/xbrl/fee-war
price $0.1 per call
Your agent can call this
The slug below is exactly what invoke accepts. Addendpoint (a route_cards[].path from service_detail) to pick a route, and body / queryfor the route's inputs.
# MCP (any connected agent)
tools/call nitrograph_invoke_service { "service_slug": "x402-fee-war-38f394d8", "body": { /* route inputs */ } }
# HTTP
curl -X POST https://api.nitrograph.com/v1/invoke \
-H "Authorization: Bearer $NITROGRAPH_API_KEY" -H "content-type: application/json" \
-d '{"service_slug": "x402-fee-war-38f394d8", "endpoint": "<route_cards[].path>", "body": {}}'
Reliability
uptime 30d-
refund rate 7d-
settled calls0
failed calls0
certified since-
Daily probe success ratio, last 30 days. Last probed 2026-08-26.
Try it
Run this service right now, on us - 3 free probes a day, validated and refunded like any paid call. Query params optional.