{"uid":"cap_3N2FhCoKqL5yTX2j8YHYI","slug":"zeroclick-x402-service-registry-make-a-call-vonage-tts-e3bfc8ff","name":"Make a Call (Vonage TTS)","description":"Make a phone call and deliver a text-to-speech message via Vonage (formerly Nexmo). Input: `to` (E.164 phone number like +12125551234), `message` (text to speak, max 5000 chars), optional `voice` (\"alice\" for high quality, \"man\", or \"woman\"), optional `language` (BCP-47 code like en-US). Returns: `callSid` (Vonage call UUID for tracking), `status` (queued/ringing/in-progress/completed/failed), `to` and `from` numbers, `dateCreated` (ISO timestamp), `estimatedDurationSec` (rough speech duration). The call rings the recipient, plays the spoken message, then hangs up. TRIAL ACCOUNT: may only call pre-verified numbers. Status returned is the initial status - the call proceeds asynchronously.","url":"https://call.withzero.ai/run?utm_source=zero.xyz","method":"POST","headers":{"X-ZAM-Access-Key":"zeroclick"},"bodySchema":{"type":"object","required":["to","message"],"properties":{"to":{"type":"string","pattern":"^\\+[1-9]\\d{6,14}$","description":"Phone number in E.164 format (e.g. +12125551234)"},"voice":{"enum":["alice","man","woman"],"type":"string","default":"alice","description":"Text-to-speech voice. \"alice\" is high quality, \"man\" and \"woman\" are classic TTS voices."},"message":{"type":"string","maxLength":5000,"minLength":1,"description":"Text message to speak to the call recipient (max 5000 characters)"},"language":{"type":"string","default":"en-US","description":"BCP-47 language code for TTS (e.g. en-US, en-GB, es-ES, fr-FR, de-DE, ja-JP, zh-CN). Vonage supports many languages via its TTS engine."}},"additionalProperties":false},"responseSchema":{"type":"object","required":["callSid","status","to","from","dateCreated","estimatedDurationSec"],"properties":{"to":{"type":"string","description":"Recipient phone number"},"from":{"type":"string","description":"Caller phone number"},"status":{"type":"string","description":"Call status: queued, ringing, in-progress, completed, failed, busy, no-answer, canceled"},"callSid":{"type":"string","description":"Twilio call SID for tracking (e.g. CA...)"},"dateCreated":{"type":"string","description":"ISO 8601 timestamp when call was initiated"},"estimatedDurationSec":{"type":"number","description":"Estimated speech duration in seconds (based on ~150 words/min)"}},"additionalProperties":false},"example":null,"exampleRequest":null,"tags":["communication","call","phone","voice","vonage","nexmo","tts","text-to-speech","notification"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":4,"rating":{"score":"0.08","successRate":"0.17","reviews":4,"stars":"1.3","state":"rated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PNa5UefGAtG2apk56fC2-","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x20c000000000000000000000b9537d11c60e8b50","unit":"request","depositMicros":null,"planRef":null}],"brandName":"ZeroClick x402 Service Registry","brandSlug":"zeroclick-x402-service-registry","brandBaseUrl":"https://withzero.ai","brandDocsUrl":null,"whatItDoes":"Places an outbound phone call to a specified number and reads a text-to-speech message aloud via Vonage","exampleAgentPrompt":"Call +12125551234 and read them this message in a high-quality female voice in English: 'Your package has arrived and is waiting at the front desk. Please pick it up before 6pm today.'","exampleUseCases":null,"resultDescription":"Returns a callSid (Vonage call UUID for tracking), initial call status (e.g. queued or ringing), the to and from phone numbers, an ISO timestamp of when the call was created, and an estimated speech duration in seconds. The call proceeds asynchronously after the initial response.","failureModes":["Invalid phone number format (not E.164) — validation error returned","Trial account restriction: can only call pre-verified numbers — call fails with authorization error","Message exceeds 5000 character limit — validation error","Unsupported language code — TTS engine may fall back or error","Recipient busy or unreachable — status returns busy or no-answer","Payment failure (insufficient USDC) — call not placed"],"whenToPreferThis":"Use this endpoint when you need to deliver a spoken voice message to a phone number programmatically, especially for notifications, alerts, or automated announcements. Prefer this over SMS when voice delivery is required. Best for single outbound calls with a specific message to speak.","instructions":null,"reviewSummary":"This Make a Call (Vonage) capability is largely non-functional in practice: the majority of attempts result in HTTP 502 or 401 errors caused by missing or invalid Vonage credentials, meaning no call is placed despite charges being applied. In one case a call did connect, but TTS clarity was poor and digits were difficult to understand. Overall reviewer sentiment is strongly negative, with most flagging the service as broken at the provider configuration level.","reviewSummaryHighlights":["Occasionally connects and plays TTS messages when credentials are working"],"reviewSummaryConcerns":["Frequent HTTP 502/401 failures due to misconfigured or missing Vonage credentials","Charges applied even when no call is placed","Poor TTS digit pronunciation when calls do connect"],"reviewSummaryGeneratedAt":"2026-07-01T12:27:30.429Z","activationCount":6,"lastUsedAt":"2026-07-01T11:15:21.331Z","lastSuccessfullyRanAt":"2026-04-30T00:28:51.495Z","lastHealthCheckAt":"2026-10-21T11:34:30.610Z","isFirstParty":true,"canonicalSlug":"zeroclick-x402-service-registry-make-a-call-vonage-tts-e3bfc8ff"}