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List

Cheapest x402 verification APIs

24 x402 verification APIs catalogued, ranked by price per call (cheapest first). Updated November 3, 2026.

Top pick80gpt55.558686.xyz100% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
#API
1——$0.00005 – $0.00527——
2$15.25*132▲ 100.0%$0.0001 – $1024153 ms80
3——$0.0005 – $49227205 ms—
4$678.83*34,139+▼ 30.4%$0.001 – $0.123329 ms55
5——$0.001 – $0.0537353 ms—
6$9.9895▲ 33.3%$0.001 – $151600 ms79
7——$0.0011122 ms—
8——$0.001 – $0.005573 ms—
9——$0.0011——
10——$0.001 – $0.01591 ms—
11——$0.00110340 ms—
12$0.018▲ 0.0%$0.001 – $0.01528230 ms66
13——$0.005 – $0.153523 ms—
14$13.72*42▼ 100.0%$0.005 – $1.8522169 ms72
15——$0.005 – $0.012——
16——$0.005 – $0.0217198 ms—
17$3.42*204▼ 100.0%$0.0052208 ms83
18$0.06*3▲ 100.0%$0.005 – $0.023182 ms—
19——$0.011——
20——$0.01193 ms—
21——$0.011——
22——$0.011——
23——$0.011——
24——$0.05 – $0.39——

FAQ

What is the cheapest x402 verification API?
Notify — from $0.00005 – $0.005 per call.
Which x402 verification API is the most reliable?
gpt55.558686.xyz, at 100% measured uptime.
What is the best x402 verification API right now?
gpt55.558686.xyz, with the highest 402radar Trust score (80).
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.