{"id":"d8f999e0-1a6c-476b-816f-ea2314a5a251","shortId":"EB4Qfv","kind":"mpp","title":"Make AI phone calls, buy phone numbers, and check iMessage/FaceTime status — pay per request with USDC.","tagline":"Make AI phone calls, buy phone numbers, and check iMessage/FaceTime status — pay per request with USDC.","description":"StablePhone is a pay-per-request API for initiating AI-driven phone calls to US and Canadian numbers. You POST a phone number and a natural-language task (e.g. \"ask if they can meet tomorrow at 2pm\"), pay $0.54 in USDC via x402 or MPP (Tempo), and receive a call_id. The AI agent places the call using your instructions, and you poll for a transcript, summary, recording URL, and call metadata. Calls support configurable voices (7 presets plus custom Bland.ai voice IDs), max duration up to 30 minutes, voicemail handling, call transfer, and custom caller ID via dedicated phone numbers.\n\nBeyond calls, StablePhone offers dedicated phone number provisioning ($20.00 for 30 days, $15.00 to extend) for use as outbound caller ID, and an iMessage/FaceTime lookup endpoint ($0.05) that asynchronously checks whether a number is registered for Apple messaging services, returning carrier and country info as well. All paid endpoints settle in USDC on Base (or via Tempo L2). Free status-polling and listing endpoints use SIWX (Sign-In With X) wallet authentication — no API keys or accounts required.\n\nThe API is fully documented via an OpenAPI 3.1 spec and an llms.txt guidance file. Phone numbers must be in E.164 format (+1XXXXXXXXXX). Numbers on the Do-Not-Call list return 403 and should not be retried.","tags":["phone","call","voice","ai-call","imessage"],"capabilities":["ai-phone-calls","phone-number-provisioning","imessage-lookup","facetime-lookup","voicemail-handling","call-transfer","call-recording","call-transcript","voice-selection","x402-payment","mpp-tempo-payment","siwx-auth","usdc-on-base","async-polling"],"categories":["telephony","ai-agent","communication"],"synonyms":["AI phone call API","automated phone call","voice agent API","phone number rental","iMessage check","FaceTime lookup","Bland.ai wrapper","pay-per-call telephony","USDC phone call","micropayment phone API"],"warnings":["Probe returned 405 on HEAD/GET — expected for a POST-only endpoint; the endpoint is live based on OpenAPI and landing page evidence","The /docs page returns 404; all documentation is in the OpenAPI spec and llms.txt guidance","Phone numbers are restricted to US/CA (+1 E.164 format only)","Calls that hit Do-Not-Call (DNC) numbers return 403 — do not retry"],"endpointUrl":"https://stablephone.dev/api/call","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stablephone.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 spec with detailed schemas, clear pricing, extensive guidance/llms.txt, multiple endpoints documented with request/response schemas. The endpoint returned 405 on HEAD/GET probes (expected since it's POST-only), not a failure. Deducted slightly because /docs returns 404 and there are no separate human-readable docs beyond the landing 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'0.05':163 '0.54':74 '15.00':149 '20.00':145 '2pm':72 '3.1':225 '30':123,147 '403':250 '7':112 'AI phone call API' 'Bland.ai wrapper' 'FaceTime lookup' 'USDC phone call' 'account':215 'agent':89 'ai':2,18,44,88 'ai-driven':43 'ai-phone-calls' 'api':40,212,218 'appl':173 'ask':65 'async-polling' 'asynchron':165 'authent':210 'automated phone call' 'base':190 'beyond':137 'bland.ai':116 'buy':5,21 'call':4,20,47,85,92,106,108,127,138,247 'call-recording' 'call-transcript' 'call-transfer' 'caller':131,156 'canadian':51 'carrier':177 'check':9,25,166 'configur':110 'countri':179 'custom':115,130 'day':148 'dedic':134,141 'do-not-cal':244 'document':221 'driven':45 'durat':120 'e.164':237 'e.g':64 'endpoint':162,185,201 'extend':151 'facetime-lookup' 'file':231 'format':238 'free':195 'fulli':220 'guidanc':230 'handl':126 'iMessage check' 'id':86,118,132,157 'imessage-lookup' 'imessage/facetime':10,26,160 'info':180 'initi':42 'instruct':95 'key':213 'l2':194 'languag':62 'list':200,248 'llms.txt':229 'lookup':161 'make':1,17 'max':119 'meet':69 'messag':174 'metadata':107 'micropayment phone API' 'minut':124 'mpp':80 'mpp-tempo-payment' 'must':234 'natur':61 'natural-languag':60 'number':7,23,52,57,136,143,169,233,241 'offer':140 'openapi':224 'outbound':155 'paid':184 'pay':12,28,37,73 'pay-per-call telephony' 'pay-per-request':36 'per':13,29,38 'phone':3,6,19,22,46,56,135,142,232 'phone number rental' 'phone-number-provisioning' 'place':90 'plus':114 'poll':98,198 'post':54 'preset':113 'provis':144 'receiv':83 'record':103 'regist':171 'request':14,30,39 'requir':216 'retri':255 'return':176,249 'servic':175 'settl':186 'sign':205 'sign-in':204 'siwx':203 'siwx-auth' 'spec':226 'stablephon':33,139 'status':11,27,197 'status-pol':196 'summari':102 'support':109 'task':63 'tempo':81,193 'tomorrow':70 'transcript':101 'transfer':128 'url':104 'us':49 'usdc':16,32,76,188 'usdc-on-base' 'use':93,153,202 'via':77,133,192,222 'voic':111,117 'voice agent API' 'voice-selection' 'voicemail':125 'voicemail-handling' 'wallet':209 'well':182 'whether':167 'x':208 'x402':78 'x402-payment' 'xxxxxxxxxx':240","prices":[{"id":"faa0c111-27e4-471e-a1aa-a072bf4672a9","listingId":"d8f999e0-1a6c-476b-816f-ea2314a5a251","amountUsd":"0.54","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"540000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"stablephone.dev","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"540000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Make an AI phone call"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:54.121Z"}],"sources":[{"listingId":"d8f999e0-1a6c-476b-816f-ea2314a5a251","source":"mpp_dev","sourceId":"stablephone:POST:/api/call","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:54.121Z","lastSeenAt":"2026-04-23T02:15:27.168Z"}],"details":{"listingId":"d8f999e0-1a6c-476b-816f-ea2314a5a251","quickStartSnippet":"curl -X POST https://stablephone.dev/api/call \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"phone_number\": \"+14155551234\",\n    \"task\": \"Call and ask if they can meet tomorrow at 2pm. Be friendly and professional.\"\n  }'\n# Returns 402 — pay with an x402/MPP client, then receive {\"success\":true,\"call_id\":\"abc-123-def\"}","exampleRequest":{"task":"Call this person and ask if they're available for a meeting tomorrow at 2pm.","model":"base","voice":"nat","record":true,"max_duration":5,"phone_number":"+14155551234","voicemail_action":"hangup"},"exampleResponse":{"call_id":"abc-123-def","message":"Call initiated successfully","success":true},"schema":{"path":"/api/call","method":"POST","payment":{"amount":"540000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Make an AI phone call"},"description":"Make an AI phone call"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"POST /api/call costs $0.54 per call","source_url":"https://stablephone.dev"},{"claim":"POST /api/number costs $20.00 for a 30-day phone number","source_url":"https://stablephone.dev"},{"claim":"POST /api/number/topup costs $15.00 to extend by 30 days","source_url":"https://stablephone.dev"},{"claim":"POST /api/lookup costs $0.05 for iMessage/FaceTime check","source_url":"https://stablephone.dev"},{"claim":"Payment settles in USDC on Base or via Tempo L2","source_url":"https://stablephone.dev"},{"claim":"Powered by Bland.ai for voice calls","source_url":"https://stablephone.dev"},{"claim":"Numbers on the Do-Not-Call list return 403","source_url":"https://stablephone.dev"},{"claim":"Seven voice presets available: nat, josh, maya, june, paige, derek, florian","source_url":"https://stablephone.dev"}],"useCases":["Scheduling meetings or appointments via automated AI phone calls","Verifying whether a phone number supports iMessage or FaceTime before messaging","Provisioning temporary US/CA phone numbers for outbound caller ID","Leaving voicemails programmatically with natural-sounding AI voices","Building AI agents that can make phone calls on behalf of users"],"bestFor":["AI agents that need to place real phone calls as part of a workflow","Developers wanting pay-per-use telephony without API keys or accounts","Checking iMessage/FaceTime availability for phone numbers at scale","Prototyping voice-based outreach with configurable AI personas"],"notFor":["High-volume call center operations (max 30-min calls, single-call pricing)","International numbers outside US and Canada (phone_number pattern is +1 only)","Real-time two-way voice conversations (calls are agent-initiated, not interactive for the caller)"],"kindDetails":{"docs":{"llmsTxt":"https://stablephone.dev/llms.txt","homepage":"https://stablephone.dev"},"tags":["phone","call","voice","ai-call","imessage"],"realm":"stablephone.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stablephone.dev","name":"Merit Systems"},"categories":["ai","social"],"service_id":"stablephone","integration":"first-party","service_name":"StablePhone","service_description":"AI phone calls, dedicated phone numbers, and iMessage/FaceTime lookup — pay per request."},"updatedAt":"2026-04-23T02:15:27.168Z"}}