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402radar
List

Most reliable x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by measured uptime. Updated June 22, 2026.

Top pick82Base Intel API100% uptime · from $0.002 – $0.015/call
BestCheapestMost reliable
# API
1 $0.97* 166 ▼ 37.5% $0.002 – $0.015 20 44 ms 82
2 $0.28* 133 ▼ 50.0% $0.0001 – $0.066667 120 697 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 — — $0.001 – $0.01 5 90 ms —
6 — — $0.005 1 115 ms —
7 — — $0.0005 – $49 227 194 ms —
8 — — $0.1 – $1.5 5 82 ms —
9 — — $0.005 – $0.01 2 348 ms —
10 — — $0.005 1 3518 ms —
11 — — $0.01 1 274 ms —
12 — — $0.001 1 369 ms —
13 $678.12* 33,894+ ▼ 0.4% $0.001 – $0.1 23 178 ms 55
14 — — $0.005 1 1748 ms —
15 — — $0.001 – $0.05 373 33 ms —
16 — — $0.003 – $10 12 1752 ms —

FAQ

What is the cheapest x402 monitoring API?
Notify — from $0.00005 – $0.005 per call.
Which x402 monitoring API is the most reliable?
Base Intel API, at 100% measured uptime.
What is the best x402 monitoring API right now?
Base Intel API, with the highest 402radar Trust score (82).
How are these x402 monitoring APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.