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List

Cheapest x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by price per call (cheapest first). Updated November 2, 2026.

Top pick68gpt55.558686.xyz33% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
#API
1——$0.00005 – $0.00527——
2$15.24*131▲ 0.0%$0.0001 – $1024152 ms68
3——$0.0005 – $49227204 ms—
4——$0.001 – $0.0537358 ms—
5——$0.001 – $0.015——
6$677.40*34,067+▼ 35.7%$0.001 – $0.123329 ms55
7$0.018▲ 0.0%$0.001 – $0.01528240 ms65
8——$0.0011——
9$0.05*14▼ 33.3%$0.002 – $0.0152078 ms69
10——$0.003 – $101255 ms—
11——$0.0051——
12——$0.0051——
13$13.72*42$0.005 – $1.8522138 ms72
14$0.06*3▲ 100.0%$0.005 – $0.023234 ms—
15——$0.0051——
16——$0.011——

FAQ

What is the cheapest x402 monitoring API?
Notify — from $0.00005 – $0.005 per call.
Which x402 monitoring API is the most reliable?
APIMesh Health Checks, at 100% measured uptime.
What is the best x402 monitoring API right now?
gpt55.558686.xyz, with the highest 402radar Trust score (68).
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.