x402radar
List

Cheapest x402 research APIs

14 x402 research APIs catalogued, ranked by price per call (cheapest first). 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
277%22 ms$0.0005 – $49227——
34646%20 ms$0.001 – $0.0024——
400%22 ms$0.001 – $0.05373——
56647%348 ms$0.001 – $0.01519$0.33186
65050%91 ms$0.0012——
74444%422 ms$0.0013——
85252%68 ms$0.0011——
95252%21 ms$0.0022——
106246%2689 ms$0.005 – $0.058$39.2191Payments per day, last 7 days
116060%278 ms$0.0051——
1200%1407 ms$0.011——
135252%916 ms$0.012——
145448%444 ms$0.00251——

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.