{"uid":"cap_E436lE0FNeqAdS6zGzHR5","slug":"factline-phone-number-validation-cd9ccb16","name":"Factline Phone Number Validation","description":"API and MCP servers that let AI agents and apps check people, companies, Dutch addresses and cars against official records: sanctions and PEP lists, 10 company registers, Dutch property, rent and RDW vehicle data. From $0.001 per call.","url":"https://factline.dev/v1/phone/verify?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["phone"],"properties":{"phone":{"type":"string","description":"Phone number, international (+31612345678) or national with country, e.g. 0612345678"},"country":{"type":"string","description":"Optional ISO country for national numbers, e.g. NL, DE, GB"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"e164":"+31612345678","input":"+31612345678","valid":true,"source":"Google libphonenumber metadata","country":"NL","explain":{"valid":"The number matches an allocated number range for its country (not whether it is currently in service).","line_type":"From the number range. Ported numbers keep their range type; carrier is not reported."},"national":"06 12345678","possible":true,"line_type":"mobile","sms_capable":true,"calling_code":"+31","country_name":"Netherlands","international":"+31 6 12345678"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_oPzJ9qYEX60dc-o9bXUAe","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates and formats a phone number for any country, returning line type, E.164/national/international formats, calling code, and SMS capability","exampleAgentPrompt":"Can you verify whether +31612345678 is a valid, SMS-capable mobile number and give me its properly formatted E.164 and national forms?","exampleUseCases":[{"title":"Signup form phone verification","prompt":"Before creating this user account, check if the phone number they entered — 0612345678 with country NL — is a valid mobile number that can receive SMS for two-factor authentication."},{"title":"CRM contact data cleanup","prompt":"I have a list of customer phone numbers in various formats; start with +447911123456 and tell me if it's valid, what line type it is, and give me the clean E.164 version for our CRM."},{"title":"KYC onboarding phone check","prompt":"As part of KYC for this new user, verify that the phone number +4915212345678 is a real, possible German number, tell me if it's mobile or landline, and whether we can send them an SMS verification code."}],"resultDescription":"A JSON object containing: the input number, E.164/national/international formatted versions, calling code, ISO country code and country name, boolean valid and possible flags, line type (mobile, landline, VoIP, toll-free, premium rate, or shared cost), sms_capable boolean hint, data source attribution, and human-readable explanations for the valid and line_type fields.","failureModes":["Invalid or unparseable phone number returns valid:false and possible:false","National number submitted without a country parameter may fail to parse","Non-existent or unallocated number range returns possible:false","Ported numbers may show original range type rather than actual carrier","Missing required phone query parameter returns an error","Rate limiting or payment failure (x402) blocks the request"],"whenToPreferThis":"Choose this endpoint when you need fast, globally applicable phone number validation with rich metadata (line type, SMS capability, multi-format output) powered by Google libphonenumber — ideal for signup flows, KYC pipelines, CRM cleanup, or SMS/calling agents where knowing mobile vs. landline vs. VoIP matters. Prefer it over regex-only validators or carrier lookup services when you need format normalization and line type classification in a single call without a separate carrier API.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:31:11.746Z","isFirstParty":false,"canonicalSlug":"factline-phone-number-validation-cd9ccb16"}