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List

Best x402 verification APIs

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

Top pick83contract-guard100% uptime · from $0.005/call
BestCheapestMost reliable
#API
1$3.42*205▲ 300.0%$0.0052208 ms83
2$15.25*133▲ 100.0%$0.0001 – $1024153 ms80
3$10.06102▼ 11.1%$0.001 – $151537 ms79
4$13.72*42▼ 100.0%$0.005 – $1.8522169 ms72
5$0.018▲ 0.0%$0.001 – $0.01528247 ms66
6$683.03*34,353+▼ 15.7%$0.001 – $0.123329 ms55
7$0.06*3$0.005 – $0.023182 ms—
8——$0.0005 – $49227206 ms—
9——$0.001 – $0.0537353 ms—
10——$0.005 – $0.01293 ms—
11——$0.00005 – $0.00527——
12——$0.05 – $0.39——
13——$0.001 – $0.005573 ms—
14——$0.011——
15——$0.011——
16——$0.0011——
17——$0.001 – $0.01591 ms—
18——$0.00110309 ms—
19——$0.01193 ms—
20——$0.011——
21——$0.0011122 ms—
22——$0.005 – $0.0217198 ms—
23——$0.011——
24——$0.005 – $0.153523 ms—

FAQ

What is the cheapest x402 verification API?
Notify — from $0.00005 – $0.005 per call.
Which x402 verification API is the most reliable?
contract-guard, at 100% measured uptime.
What is the best x402 verification API right now?
contract-guard, with the highest 402radar Trust score (83).
How are these x402 verification APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.