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Phone Number E.164 Format Validator
x402
Phone Number E.164 Format Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-29).
Validates whether a phone number string conforms to the E.164 international format standard (no carrier lookup)
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs whether a phone number matches E.164. No carrier lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-phone-e164 first.
Output
A boolean or structured response indicating whether the provided phone number string conforms to E.164 format (starts with +, followed by up to 15 digits, correct length and structure). No carrier or line-type information is returned.
Example use cases
Form submission phone validation
“Before I save this user's profile, can you verify that their phone number +442071838750 is valid E.164 format?”
CRM data cleanup check
“I have a phone number from our database — +33123456789 — can you tell me if it's properly E.164 formatted so I know if it needs fixing?”
Pre-SMS pipeline validation
“We're about to queue a message to +819012345678 — quickly check if that number is E.164 compliant before we send it out.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-phone-e164?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you only need to verify that a phone number string is structurally valid per the E.164 standard and do not need carrier information, line type, or number portability data. It is the cheapest option at $0.001 USDC per call. Always try the free sandbox endpoint POST /v1/sandbox/check-phone-e164 first during development or testing before using this paid endpoint.
Side effects
- Empty or missing value field returns an error
- Value exceeding 20000 characters rejected
- Malformed request body returns 400
- Payment not attached or insufficient USDC returns 402
- Network timeout or service unavailability returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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