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402radar
List

Cheapest x402 verification APIs

24 x402 verification 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 — — $0.001 – $0.05 373 34 ms —
5 $1.96 65 ▼ 80.0% $0.001 – $0.005 5 744 ms 77
6 — — $0.001 1 104 ms —
7 $0.19 109 ▲ 100.0% $0.001 – $0.015 28 357 ms 79
8 $655.60* 32,770+ ▲ 0.2% $0.001 – $0.1 23 178 ms 55
9 $13.17 623 ▲ 999.0% $0.001 – $0.95 45 384 ms 89
10 — — $0.001 1 134 ms —
11 — — $0.001 – $0.01 5 90 ms —
12 — — $0.001 10 373 ms —
13 — — $0.005 1 364 ms —
14 — — $0.005 – $0.01 2 105 ms —
15 — — $0.005 – $0.01 2 348 ms —
16 $0.97* 66 ▼ 22.2% $0.005 – $0.02 17 320 ms 77
17 $1.15 39 ▼ 50.0% $0.005 – $0.15 34 22 ms 74
18 — — $0.01 1 90 ms —
19 — — $0.01 1 91 ms —
20 — — $0.01 1 90 ms —
21 — — $0.01 1 91 ms —
22 — — $0.01 1 89 ms —
23 — — $0.05 – $0.3 9 341 ms —
24 — — $0.1 – $1.5 5 82 ms —

FAQ

What is the cheapest x402 verification API?
Notify — from $0.00005 – $0.005 per call.
Which x402 verification API is the most reliable?
Notify, at 100% measured uptime.
What is the best x402 verification API right now?
Notify, with the highest 402radar Trust score (73).
How are these x402 verification APIs ranked?
By 402radar Trust — a composite of measured uptime, success rate, /quote latency and price, computed on real traffic and refreshed hourly.