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402radar
List

Best x402 research APIs

14 x402 research APIs catalogued, ranked by Trust score (uptime, success rate, latency and price, on real traffic). Updated June 22, 2026.

Top pick80GPT-5.5 Compact Chat x402100% uptime · from $0.0001 – $0.066667/call
BestCheapestMost reliable
# API
1 $0.28* 133 ▼ 50.0% $0.0001 – $0.066667 120 694 ms 80
2 $0.92 125 ▲ 17.6% $0.005 – $0.05 10 2702 ms 80
3 $0.19 109 ▲ 100.0% $0.001 – $0.015 28 358 ms 79
4 $0.16 32 ▼ 33.3% $0.00005 – $0.005 26 90 ms 73
5 — — — 1 442 ms —
6 — — $0.001 – $0.05 373 34 ms —
7 — — $0.01 2 991 ms —
8 — — $0.001 1 65 ms —
9 — — $0.005 1 280 ms —
10 — — $0.001 – $0.002 4 21 ms —
11 — — $0.01 1 1738 ms —
12 — — $0.0005 – $49 227 192 ms —
13 — — $0.002 2 21 ms —
14 — — $0.001 3 423 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?
GPT-5.5 Compact Chat x402, at 100% measured uptime.
What is the best x402 research API right now?
GPT-5.5 Compact Chat x402, with the highest 402radar Trust score (80).
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.