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List

Cheapest x402 validation APIs

14 x402 validation 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 $0.39 287 ▲ 100.0% $0.001 – $0.015 28 — 84
5 — — $0.001 – $0.05 373 — —
6 $0.09 11 ▼ 100.0% $0.001 – $0.01 5 — 67
7 — — $0.001 1 — —
8 — — $0.001 10 — —
9 — — $0.001 1 — —
10 $1.88 373 ▼ 77.8% $0.001 – $0.015 73 — 86
11 — — $0.003 1 — —
12 $1.31 47 ▼ 66.7% $0.005 – $0.15 34 — 75
13 — — $0.01 1 — —
14 — — $0.05 – $0.3 9 — —

FAQ

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