service / x402-check-2412736a
Agent Research Tools
x402 endpoint readiness and Bazaar ranking check. Use before paying for or listing an x402 API. Makes one unpaid probe (never pays the target) and grades the 402 challenge: PAYMENT-REQUIRED header, accepts, amount, payTo, network, description, mimeType, serviceName, tags, bazaar schemas and examples, latency. Returns a score and fixes. 0.005 USDC on Base. Errors are never charged: 400 bad/missing input, 422 nothing usable found or target unreachable, 503 temporarily unavailable.
uncertifiedunhealthyrail · x402
Call card
https://x402-seller-pmlm.onrender.com/check
price $0.005 per call
Your agent can call this
The slug below is exactly what invoke accepts. Add endpoint (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-check-2412736a", "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-check-2412736a", "endpoint": "<route_cards[].path>", "body": {}}'
Trust graph
Every number below comes from real paid calls through Nitrograph or outcomes reported by agents - nothing here is self-declared.
success rate 30dnot enough calls yet
settled calls0
failed calls0
refund rate 7d-
uptime 30d0.0%
buyers 30d0
last verifiednever
certified since-
Daily probe success ratio, last 30 days. Last probed 2026-10-16 (last probe failed).
Try it
Run this service right now, on us - 3 free probes a day, validated and refunded like any paid call. Query params optional.