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List

Most reliable x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by measured uptime. Updated November 5, 2026.

Top pick80gpt55.558686.xyz100% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
#API
1$15.25*133▲ 0.0%$0.0001 – $1024153 ms80
2$13.72*42▼ 100.0%$0.005 – $1.8522163 ms73
3$0.04*14▲ 0.0%$0.002 – $0.0152047 ms69
4$0.018$0.001 – $0.01528247 ms66
5——$0.001 – $0.01591 ms—
6——$0.011——
7——$0.0051——
8——$0.0005 – $49227206 ms—
9$0.06*3▼ 100.0%$0.005 – $0.023182 ms—
10——$0.001 – $0.0537348 ms—
11——$0.0051——
12$670.58*33,742+▼ 26.1%$0.001 – $0.123329 ms55
13——$0.0011——
14——$0.0051——
15——$0.003 – $101262 ms—
16——$0.00005 – $0.00527——

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.