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Cheapest x402 validation APIs

15 x402 validation 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——
35050%89 ms$0.0005 – $0.0012——
46647%348 ms$0.001 – $0.01519$0.33186
500%22 ms$0.001 – $0.05373——
67152%750 ms$0.001 – $0.0053$7.8060Payments per day, last 7 days
75252%104 ms$0.0011——
83333%213 ms$0.00110——
94848%104 ms$0.0011——
108275%19 ms$0.001 – $0.01548$0.3165Payments per day, last 7 days
116161%89 ms$0.0011——
125555%214 ms$0.0031——
135651%21 ms$0.005 – $0.1516$0.4720Payments per day, last 7 days
146262%57 ms$0.011——
154343%320 ms$0.05 – $0.39——

FAQ

What is the cheapest x402 validation API?
GPT-5.5 Compact Chat x402 — from $0.0001 – $0.066667 per call.
Which x402 validation API is the most reliable?
glim.sh, at 75% measured uptime.
What is the best x402 validation API right now?
GPT-5.5 Compact Chat x402, with the highest x402radar Trust score (76).
How are these x402 validation APIs ranked?
By x402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.