Services: —Endpoints: —Facilitators: —Total Volume: —7d Vol: —24h Vol: —
402radar402radar
List

Most reliable x402 verification APIs

24 x402 verification APIs catalogued, ranked by measured uptime. Updated November 5, 2026.

Top pick83contract-guard100% uptime · from $0.005/call
BestCheapestMost reliable
#API
1$3.32*190▲ 100.0%$0.0052208 ms83
2$15.25*133▲ 0.0%$0.0001 – $1024153 ms80
3$10.13109▲ 60.0%$0.001 – $151537 ms79
4$13.72*42▼ 100.0%$0.005 – $1.8522163 ms74
5$0.018$0.001 – $0.01528247 ms66
6——$0.011——
7——$0.005 – $0.0217198 ms—
8——$0.011——
9——$0.05 – $0.39——
10——$0.005 – $0.153523 ms—
11——$0.001 – $0.0537346 ms—
12——$0.0005 – $49227206 ms—
13——$0.011——
14$0.06*3▼ 100.0%$0.005 – $0.023179 ms—
15——$0.0011——
16——$0.001 – $0.01591 ms—
17——$0.00110278 ms—
18——$0.01193 ms—
19——$0.011——
20——$0.005 – $0.01293 ms—
21$676.32*34,030+▼ 16.8%$0.001 – $0.123329 ms55
22——$0.001 – $0.005573 ms—
23——$0.00005 – $0.00527——
24——$0.0011122 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.