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402radar
List

Cheapest x402 validation APIs

14 x402 validation APIs catalogued, ranked by price per call (cheapest first). Updated June 22, 2026.

Top pick73Notify100% uptime · from $0.00005 – $0.005/call
BestCheapestMost reliable
# API
1 $0.16 32 ▼ 33.3% $0.00005 – $0.005 26 90 ms 73
2 $0.28* 133 ▼ 50.0% $0.0001 – $0.066667 120 697 ms 80
3 — — $0.0005 – $49 227 194 ms —
4 $0.19 109 ▲ 100.0% $0.001 – $0.015 28 358 ms 79
5 — — $0.001 – $0.05 373 33 ms —
6 $1.96 65 ▼ 40.0% $0.001 – $0.005 5 745 ms 77
7 — — $0.001 1 104 ms —
8 — — $0.001 10 373 ms —
9 — — $0.001 1 133 ms —
10 $1.05 206 ▼ 80.4% $0.001 – $0.015 73 32 ms 83
11 — — $0.003 1 233 ms —
12 $1.15 39 ▲ 60.0% $0.005 – $0.15 34 21 ms 74
13 — — $0.01 1 58 ms —
14 — — $0.05 – $0.3 9 341 ms —

FAQ

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