Endpoint · computeGET402utils.com /v1/email-check ?email=user%40example.com
Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain…
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Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.003 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://402utils.com/v1/email-check?email=user%40example.com
Seen
first 35 days ago · last 3 days ago
64 free handshakes
Payment
Pays through
x402
Offered on?
Base USDC
Listed on?
Base
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.534 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held down by liveness · gap to 1.000 is 0.466: 0.092 uncertain ? + 0.374 short ? · 0.116 to C
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| livenesscosts the most it answered at all |
0.60 | 0.71 | 0.557 | 0.334 | −0.174 | −0.092 | |
| latency p95 it answered as fast as its class |
0.20 | 0.00 | 0.000 | 0.000 | −0.200 | 0 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.534 | gap to 1.000 = 0.466 · 0.374 short · 0.092 uncertain | 0.534 | −0.374 | −0.092 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.600 × 0.557 liveness
+ 0.200 × 0.000 latency p95
+ 0.200 × 1.000 price stability
= 0.534 → UNRATED: 56 of 30 paid calls weights 2026.09.6 · 56 samples · seed cap_01M1A5A6WDEC834ETT7WM6F6TQ|2026-09-03T23:18:17.622Z|2026.09.6
Verify it yourself
npx teppi-check https://402utils.com/v1/email-check?email=user%40example.comcurl -s https://api.teppi.xyz/v1/trust/cap_01M1A5A6WDEC834ETT7WM6F6TQ