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Most reliable x402 research APIs

14 x402 research APIs catalogued, ranked by measured uptime. Updated November 11, 2026.

Top pick89Asterpay100% uptime · from $0.004 – $0.1/call
BestCheapestMost reliable
#API
1$17.88581▼ 100.0%$0.004 – $0.127201 ms89
2$4.93*105$0.0001 – $1024139 ms79
3$0.018▲ 100.0%$0.001 – $0.01528233 ms66
4——$0.0013——
5——$0.0022——
6——$0.0011——
7——$0.001 – $0.0537342 ms—
8——$0.0051——
9——$0.012——
10——$0.001 – $0.0024——
11——$0.012 – $0.2614561 ms—
12——$0.0005 – $49227209 ms—
13——$0.011——
14——$0.00005 – $0.00527——

FAQ

What is the cheapest x402 research API?
Notify — from $0.00005 – $0.005 per call.
Which x402 research API is the most reliable?
Asterpay, at 100% measured uptime.
What is the best x402 research API right now?
Asterpay, with the highest 402radar Trust score (89).
How are these x402 research APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.