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List

Best x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by Trust score (uptime, success rate, latency and price, on real traffic). Updated November 4, 2026.

Top pick80gpt55.558686.xyz100% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
#API
1$15.25*133▲ 100.0%$0.0001 – $1024153 ms80
2$13.72*42▼ 100.0%$0.005 – $1.8522169 ms72
3$0.04*14▲ 100.0%$0.002 – $0.0152055 ms69
4$0.018▲ 0.0%$0.001 – $0.01528247 ms66
5$683.03*34,353+▼ 15.7%$0.001 – $0.123329 ms55
6$0.06*3$0.005 – $0.023182 ms—
7——$0.0005 – $49227206 ms—
8——$0.001 – $0.0537353 ms—
9——$0.00005 – $0.00527——
10——$0.001 – $0.01591 ms—
11——$0.0051——
12——$0.011——
13——$0.003 – $101252 ms—
14——$0.0051——
15——$0.0051——
16——$0.0011——

FAQ

What is the cheapest x402 monitoring API?
Notify — from $0.00005 – $0.005 per call.
Which x402 monitoring API is the most reliable?
gpt55.558686.xyz, at 100% measured uptime.
What is the best x402 monitoring API right now?
gpt55.558686.xyz, with the highest 402radar Trust score (80).
How are these x402 monitoring APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.