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List

Best x402 verification APIs

24 x402 verification APIs catalogued, ranked by Trust score (uptime, success rate, latency and price, on real traffic). Updated August 5, 2026.

Top pick94GPT-5.5 Compact Chat x40289% uptime · from $0.0001 – $10/call
BestCheapestMost reliable
# API
1 $109.49* 9,426 ▼ 63.3% $0.0001 – $10 226 — 94
2 $14.14 807 ▼ 50.7% $0.001 – $0.49 46 — 90
3 $0.39 287 ▲ 100.0% $0.001 – $0.015 28 — 84
4 $0.96* 65 $0.005 – $0.05 17 — 77
5 $1.31 47 ▼ 66.7% $0.005 – $0.15 34 — 75
6 $0.09 11 ▼ 100.0% $0.001 – $0.01 5 — 67
7 $386.20* 19,302 $0.001 – $0.1 23 — 48
8 $0.09 17 $0.00005 – $0.005 27 — 24
9 — — $0.001 – $0.05 373 — —
10 — — $0.001 1 — —
11 — — $0.1 – $1.5 5 — —
12 — — $0.001 10 — —
13 — — $0.01 1 — —
14 — — $0.01 1 — —
15 — — $0.005 – $0.01 2 — —
16 — — $0.005 – $0.01 2 — —
17 — — $0.001 1 — —
18 — — $0.05 – $0.3 9 — —
19 — — $0.01 1 — —
20 — — $0.0005 – $49 227 — —
21 — — $0.01 1 — —
22 — — $0.001 – $0.01 5 — —
23 — — $0.01 1 — —
24 — — $0.005 1 — —

FAQ

What is the cheapest x402 verification API?
Notify — from $0.00005 – $0.005 per call.
Which x402 verification API is the most reliable?
Token Price Snapshot, at 100% measured uptime.
What is the best x402 verification API right now?
GPT-5.5 Compact Chat x402, with the highest 402radar Trust score (94).
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.