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List

Cheapest x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by price per call (cheapest first). Updated June 23, 2026.

Top pick73Notify100% uptime · from $0.00005 – $0.005/call
BestCheapestMost reliable
# API
1 $0.16 32 ▲ 200.0% $0.00005 – $0.005 26 91 ms 73
2 $0.28* 133 ▼ 97.0% $0.0001 – $0.066667 120 686 ms 80
3 — — $0.0005 – $49 227 191 ms —
4 $0.19 109 ▲ 100.0% $0.001 – $0.015 28 357 ms 79
5 — — $0.001 – $0.01 5 90 ms —
6 $655.60* 32,770+ ▲ 0.2% $0.001 – $0.1 23 178 ms 55
7 — — $0.001 – $0.05 373 34 ms —
8 — — $0.001 1 370 ms —
9 $0.97* 166 ▼ 37.5% $0.002 – $0.015 20 45 ms 82
10 — — $0.003 – $10 12 1752 ms —
11 — — $0.005 – $0.01 2 348 ms —
12 — — $0.005 1 117 ms —
13 — — $0.005 1 3525 ms —
14 — — $0.005 1 1748 ms —
15 — — $0.01 1 274 ms —
16 — — $0.1 – $1.5 5 82 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?
Notify, at 100% measured uptime.
What is the best x402 monitoring API right now?
Notify, with the highest 402radar Trust score (73).
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.