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List

Cheapest x402 monitoring APIs

16 x402 monitoring APIs catalogued, ranked by price per call (cheapest first). Updated August 5, 2026.

Top pick24Notify0% uptime · from $0.00005 – $0.005/call
BestCheapestMost reliable
# API
1 $0.09 17 $0.00005 – $0.005 27 — 24
2 $109.49* 9,426 ▼ 63.3% $0.0001 – $10 226 — 94
3 — — $0.0005 – $49 227 — —
4 — — $0.001 – $0.05 373 — —
5 — — $0.001 – $0.01 5 — —
6 $386.20* 19,302 $0.001 – $0.1 23 — 48
7 $0.39 287 ▲ 100.0% $0.001 – $0.015 28 — 84
8 — — $0.001 1 — —
9 $0.27* 50 $0.002 – $0.015 20 — 75
10 — — $0.003 – $10 12 — —
11 — — $0.005 1 — —
12 — — $0.005 1 — —
13 — — $0.005 – $0.01 2 — —
14 — — $0.005 1 — —
15 — — $0.01 1 — —
16 — — $0.1 – $1.5 5 — —

FAQ

What is the cheapest x402 monitoring API?
Notify — from $0.00005 – $0.005 per call.
Which x402 monitoring API is the most reliable?
X402-scoutgate, at 100% measured uptime.
What is the best x402 monitoring API right now?
Notify, with the highest 402radar Trust score (24).
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.