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Phone Number Validation & Normalization
x402
Phone Number Validation & Normalization is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Validates and normalizes a single phone number to E.164 format, detecting its line type, region, and returning a verdict — processed entirely on-CPU with no upstream dependencies.
Price / call$0.002
Success—
StatusUnknown
Output
Returns the phone number in E.164 canonical format, the detected line type (e.g. mobile, landline, VoIP), the geographic region or country code, and a pass/fail verdict on the number's validity — all computed locally with no external API calls.
Example use cases
Clean up user registration contacts
“A user just signed up with the phone number '(415) 555-0198' — can you validate it, normalize it to E.164, and tell me if it's a real mobile or landline number before we save it to the database?”
Classify leads before SMS campaign
“I have a lead who gave us the number +447911123456 — can you check if it's valid, figure out whether it's a mobile or VoIP line, and tell me what country it belongs to so I know if we should include them in our SMS campaign?”
Flag invalid support ticket numbers
“A support ticket came in with the phone number '00 33 1 42 68 53 00' listed as the callback number — can you validate it, convert it to proper E.164 format, and let me know if it's a legitimate landline we can actually call back?”
Technical details
Endpoint
POSThttps://x402.professorsausages.com/phone-check/check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, cheap, self-contained phone number validation with no external dependency risk — ideal for form validation pipelines, user registration flows, or any scenario where you want E.164 normalization plus line-type classification in a single call at $0.002 per lookup. Prefer it over carrier-lookup APIs when you don't need live carrier data and just want structural validity and type classification.
Side effects
- Invalid or unparseable phone number string returns an error or invalid verdict
- Missing required input parameter returns a 400-level error
- Ambiguous number without country hint may produce incorrect region detection
- Malformed request schema returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chainrequired | string | Which chain the address belongs to. base and ethereum run full on-chain mode; the rest are list-only mode. |
| addressrequired | string | The address in that chain's native format (0x… for EVM, base58/bech32 otherwise). Checked against that chain's shape BEFORE the payment gate — a malformed address is a free 400, never a 402. |
Tags
x402
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