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Cheapest x402 research APIs

14 x402 research APIs catalogued, ranked by price per call (cheapest first). Updated November 11, 2026.

Top pick79gpt55.558686.xyz100% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
#API
1——$0.00005 – $0.00527——
2$4.93*105$0.0001 – $1024139 ms79
3——$0.0005 – $49227209 ms—
4——$0.001 – $0.0537342 ms—
5——$0.0013——
6——$0.0011——
7$0.018▲ 100.0%$0.001 – $0.01528233 ms66
8——$0.001 – $0.0024——
9——$0.0022——
10$17.88581▼ 100.0%$0.004 – $0.127201 ms89
11——$0.0051——
12——$0.011——
13——$0.012——
14——$0.012 – $0.2614561 ms—

FAQ

What is the cheapest x402 research API?
Notify — from $0.00005 – $0.005 per call.
Which x402 research API is the most reliable?
gpt55.558686.xyz, at 100% measured uptime.
What is the best x402 research API right now?
gpt55.558686.xyz, with the highest 402radar Trust score (79).
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.