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Cheapest x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by price per call (cheapest first). Updated June 17, 2026.

Top pick76GPT-5.5 Compact Chat x40260% uptime · from $0.0001 – $0.066667/call
BestCheapestMost reliable
#API
17660%652 ms$0.0001 – $0.06666779$0.18*85Payments per day, last 7 days
277%22 ms$0.0005 – $49227——
36352%90 ms$0.001 – $0.00212$0.2038Payments per day, last 7 days
400%22 ms$0.001 – $0.05373——
55050%88 ms$0.001 – $0.015——
66647%348 ms$0.001 – $0.01519$0.33186
75252%336 ms$0.0011——
899%100 ms$0.003 – $1012——
900%1743 ms$0.0051——
106262%116 ms$0.0051——
114545%1742 ms$0.0051——
125555%344 ms$0.005 – $0.012——
135252%350 ms$0.011——
146060%274 ms$0.011——
155959%20 ms$0.051——
163040%83 ms$0.1 – $1.55——

FAQ

What is the cheapest x402 monitoring API?
GPT-5.5 Compact Chat x402 — from $0.0001 – $0.066667 per call.
Which x402 monitoring API is the most reliable?
AegisAGI Security, at 62% measured uptime.
What is the best x402 monitoring API right now?
GPT-5.5 Compact Chat x402, with the highest x402radar Trust score (76).
How are these x402 monitoring APIs ranked?
By x402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.