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Most reliable x402 research APIs

14 x402 research APIs catalogued, ranked by measured uptime. Updated June 17, 2026.

Top pick76GPT-5.5 Compact Chat x40260% uptime · from $0.0001 – $0.066667/call
BestCheapestMost reliable
#API
17660%652 ms$0.0001 – $0.06666779$0.18*85Payments per day, last 7 days
26060%278 ms$0.0051——
35252%68 ms$0.0011——
45252%21 ms$0.0022——
55252%916 ms$0.012——
65050%91 ms$0.0012——
75448%444 ms$0.00251——
86647%348 ms$0.001 – $0.01519$0.33186
96246%2689 ms$0.005 – $0.058$39.2191Payments per day, last 7 days
104646%20 ms$0.001 – $0.0024——
114444%422 ms$0.0013——
1277%22 ms$0.0005 – $49227——
1300%1407 ms$0.011——
1400%22 ms$0.001 – $0.05373——

FAQ

What is the cheapest x402 research API?
GPT-5.5 Compact Chat x402 — from $0.0001 – $0.066667 per call.
Which x402 research API is the most reliable?
GPT-5.5 Compact Chat x402, at 60% measured uptime.
What is the best x402 research API right now?
GPT-5.5 Compact Chat x402, with the highest x402radar Trust score (76).
How are these x402 research APIs ranked?
By x402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.