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Phone Number Format (E.164, International, National, RFC3966)
x402
Phone Number Format (E.164, International, National, RFC3966) is a paid API for AI agents from phone-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Formats a phone number into E.164, international, national, and RFC3966 tel: URI representations using region-specific numbering-plan rules.
Price / call$0.02
Success—
StatusUnknown
How this service works
Format a phone number as E.164, international, national and RFC3966 tel: URI using the region's numbering-plan rules.
Output
Returns an object containing the phone number formatted as E.164 (e.g. +12025551234), international (e.g. +1 202-555-1234), national (e.g. (202) 555-1234), and RFC3966 tel: URI (e.g. tel:+12025551234), along with validity flag, region, country code, national number, and metadata about the numbering plan source.
Example use cases
Normalize CRM phone numbers to E.164
“I have a customer phone number '(415) 555-0198' from the US — can you normalize it to E.164 format so I can store it consistently in our CRM?”
Generate tel: URI for click-to-call link
“I need to create a clickable phone link for the number +44 20 7946 0958 — can you give me the RFC3966 tel: URI format for it?”
Display local national format for European number
“I have a German phone number stored as +4930123456 and I want to display it in the local national format for Germany — can you format it that way?”
Technical details
Endpoint
GEThttps://phone-tools.x402tookit.com/phone-format?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to convert a raw phone number string into one or more standardized formats (E.164, international, national, RFC3966) according to the ITU/libphonenumber numbering-plan rules. Prefer this over manual regex formatting when regional rules matter, when you need RFC3966 URI output, or when you want all four formats in a single call.
Side effects
- Invalid or unrecognizable phone number string returns valid:false with reasons array explaining the failure
- Missing default_region when number lacks a + prefix causes ambiguous parsing or error
- Unsupported region code causes fallback or invalid result
- Network timeout or service unavailability returns HTTP error
- Passing a number that is syntactically valid but unassigned in the region's plan may return valid:false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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