Nero Labs Phone Number Validator

x402

Nero Labs Phone Number Validator is a paid API for AI agents from x402-agent-tools.nerolabs.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).

Validates up to 100 phone numbers from any country, returning E.164 format, national format, country, line type (mobile, landline, VoIP, toll-free), and validity status using Google's libphonenumber.

Price / call$0.002

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StatusUnknown

How this service works

Pay-per-call tools for AI agents, 31 in all: read web pages and RSS feeds, OCR, PDF text, transcription; email, phone and domain checks; UK, Irish and Polish company lookups and UK risk reports; website contacts, tech stack and SEO audits; PageSpeed; AI review, job post and row enrichment; data cleaning, joins, dedupe and diffs; US and EU compliance rules. No account or API key: pay each call in USDC on Base over x402.

Output

Returns an array of row objects — one per input number — each enriched with: phoneValid (boolean), phoneStatus (valid/invalid/risky/duplicate), phoneE164 (e.g. +441174960012), phoneNational, phoneInternational, phoneCountry (ISO code), phoneCountryCallingCode, phoneType (mobile/fixed_line/voip/toll_free/etc.), isMobile, phoneReason, and phoneAllReasons. Also returns a summary object with counts by status, type, country, and reason, plus input metadata.

Example use cases

SMS campaign list cleanup

“I have a list of customer phone numbers for an SMS campaign — can you check them all, flag any that aren't confirmed mobile numbers or are VoIP, and give me back only the ones safe to text? Assume US region for numbers without a country code.”

CRM import phone validation

“Before I import this batch of contacts into our CRM, can you validate all their phone numbers, normalize them to E.164 format, and mark any duplicates or invalid ones so I can fix them first? The numbers are from the UK so use GB as the default region.”

International sign-up form check

“A user just entered '0117 496 0012' as their phone number on our sign-up form — can you validate it, tell me if it's a real UK number, what line type it is, and give me the international E.164 format to store?”

Technical details

Endpoint

POSThttps://x402-agent-tools.nerolabs.workers.dev/phone-check?utm_source=zero.xyz

When to prefer

Use this endpoint when you need bulk phone number validation, normalization to E.164, or line-type classification (mobile vs landline vs VoIP) without actually calling the number. Ideal for CRM data cleanup, SMS campaign pre-screening, sign-up form validation, or any workflow needing structured phone metadata at low cost ($0.002/number). Prefer this over live-lookup services when format validation and numbering-plan checks are sufficient and you don't need to verify the line is currently active.

Side effects

Numbers without a country code and no defaultRegion set may be parsed incorrectly or flagged invalid
Batch exceeds 100 numbers — only up to 100 are supported per call
Ambiguous number formats with no region context returned as unknown type
VoIP numbers flagged as risky by default (can disable with flagVoip: false)
Numbers that exist in the numbering plan but are unallocated may still return phoneValid: true since no live line check is performed
Missing or wrong phoneField when using rows mode causes field detection fallback which may misidentify the phone column

Input

Schema · Request body

Field	Type	Description
keep	string	Which rows to return. all (default), valid, valid_and_risky, problems, or mobile (confirmed mobiles only, for SMS). The summary still counts every number.
rows	array	JSON objects that each hold a phone number in one field. Every original field comes back untouched with the verdict fields added. Use this OR phones.
phones	array	A plain list of phone numbers in any format, for example ["+44 20 7946 0123", "07825 123456", "(212) 555-0123"]. Bare numbers such as 2079460123 are also accepted. Use this OR rows.
flagVoip	boolean	Default true: VoIP numbers come back risky.
phoneField	string	Rows only. The field holding the number, for example "phone" or "contact_number". Leave out to detect it automatically.
defaultRegion	string	Two-letter ISO country code assumed for numbers written without a country code, for example GB, US, AU, DE. Numbers starting with + are unaffected.
markDuplicates	boolean	Default true: later repeats of the same E.164 number in this call come back duplicate.
flagNonPersonal	boolean	Default true: toll free, shared cost, UAN, pager and voicemail numbers come back risky.
flagPremiumRate	boolean	Default true: premium-rate numbers come back risky rather than valid.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "rows": [
      {
        "phone": "0117 496 0012",
        "isMobile": false,
        "phoneE164": "+441174960012",
        "phoneType": "fixed_line",
        "phoneValid": true,
        "lineChecked": false,
        "phoneReason": "ok",
        "phoneStatus": "valid",
        "phoneCountry": "GB",
        "phoneNational": "0117 496 0012",
        "phoneExtension": null,
        "phoneAllReasons": [
          "ok"
        ],
        "phoneInternational": "+44 117 496 0012",
        "phoneCountryCallingCode": "+44"
      },
      {
        "phone": "+1 (415) 555-0132",
        "isMobile": null,
        "phoneE164": "+14155550132",
        "phoneType": "fixed_line_or_mobile",
        "phoneValid": true,
        "lineChecked": false,
        "phoneReason": "ok",
        "phoneStatus": "valid",
        "phoneCountry": "US",
        "phoneNational": "(415) 555-0132",
        "phoneExtension": null,
        "phoneAllReasons": [
          "ok"
        ],
        "phoneInternational": "+1 415 555 0132",
        "phoneCountryCallingCode": "+1"
      },
      {
        "phone": "12345",
        "isMobile": null,
        "phoneE164": "+4412345",
        "phoneType": "unknown",
        "phoneValid": false,
        "lineChecked": false,
        "phoneReason": "too_short",
        "phoneStatus": "invalid",
        "phoneCountry": "GB",
        "phoneNational": "12345",
        "phoneExtension": null,
        "phoneAllReasons": [
          "too_short"
        ],
        "phoneInternational": "+44 12345",
        "phoneCountryCallingCode": "+44"
      }
    ],
    "summary": {
      "keep": "all",
      "counts": {
        "risky": 0,
        "valid": 2,
        "invalid": 1,
        "duplicate": 0
      },
      "warnings": [],
      "inputMode": "phones",
      "phoneField": "phone",
      "typeCounts": {
        "fixed_line": 1,
        "fixed_line_or_mobile": 1
      },
      "mobileCount": 0,
      "checkedCount": 3,
      "reasonCounts": {
        "ok": 2,
        "too_short": 1
      },
      "countryCounts": {
        "GB": 1,
        "US": 1
      },
      "defaultRegion": "GB",
      "notInThisServer": "Region, allocated carrier and timezone lookups, Apify dataset / CSV / Excel / Google Sheet input, CSV and Excel export and webhooks are in t...",
      "inputRecordCount": 3,
      "liveLineCheckNote": "These checks confirm that a number is correctly formed and exists in its country numbering plan, and report its country and line type. They ...",
      "outputRecordCount": 3,
      "phoneFieldDetected": false,
      "liveLineCheckPerformed": false,
      "undeterminedMobileCount": 1
    },
    "_example_note": "Real output, trimmed: long lists cut to their first items and long text shortened."
  }
}

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