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Cheapest x402 validation APIs

14 x402 validation 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$0.018▲ 0.0%$0.001 – $0.01528230 ms66
5——$0.001 – $0.0537353 ms—
6——$0.001 – $0.005573 ms—
7——$0.0011——
8——$0.00110340 ms—
9——$0.0011122 ms—
10$26.877,747▲ 116.4%$0.001 – $0.068118 ms94
11——$0.0031——
12——$0.005 – $0.153523 ms—
13——$0.011——
14——$0.05 – $0.39——

FAQ

What is the cheapest x402 validation API?
Notify — from $0.00005 – $0.005 per call.
Which x402 validation API is the most reliable?
gpt55.558686.xyz, at 100% measured uptime.
What is the best x402 validation API right now?
gpt55.558686.xyz, with the highest 402radar Trust score (80).
How are these x402 validation APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.