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Best x402 research APIs

14 x402 research APIs catalogued, ranked by Trust score (uptime, success rate, latency and price, on real traffic). 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——$0.001 – $0.0537338 ms—
5——$0.0011——
6——$0.0005 – $49227209 ms—
7——$0.001 – $0.0024——
8——$0.00005 – $0.00527——
9——$0.012 – $0.2614561 ms—
10——$0.0013——
11——$0.0022——
12——$0.011——
13——$0.0051——
14——$0.012——

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.