{"id":"2cb6931e-a59b-452a-88bb-060714b8aa5d","shortId":"VhDTzh","kind":"mpp","title":"Extend a StablePhone number by 30 days for $15.00 via USDC micropayment.","tagline":"Extend a StablePhone number by 30 days for $15.00 via USDC micropayment.","description":"POST /api/number/topup extends an existing StablePhone phone number by 30 days from its current expiry date (or from today if already expired). The cost is $15.00 per top-up, settled via USDC on Base using x402 or MPP (Tempo) micropayment protocols. No API keys or accounts are required.\n\nTop-ups stack: calling the endpoint multiple times prepays months ahead. Anyone can top up any number — you don't need to be the original purchaser. The request body requires a single field, `phone_number`, in E.164 format (e.g. +14155551234). The response returns the phone number and its new `expires_at` timestamp.\n\nThis endpoint is part of the StablePhone suite, which also offers AI phone calls ($0.54/call), phone number purchases ($20.00 for 30 days), and iMessage/FaceTime lookups ($0.05). Phone numbers acquired through StablePhone can be used as outbound caller IDs for AI-driven calls powered by Bland.ai. The endpoint accepts POST only; HEAD and GET return 405.","tags":["phone","call","voice","ai-call","imessage"],"capabilities":["phone-number-topup","phone-number-renewal","micropayment-x402","micropayment-mpp-tempo","usdc-on-base","e164-phone-format","stackable-topups","no-api-key"],"categories":["telephony","payments"],"synonyms":["phone number renewal","extend phone number","top up phone","StablePhone topup","phone number subscription","renew phone line","prepay phone number"],"warnings":["Probe returned 405 on HEAD and GET — endpoint is POST-only, which is consistent with the OpenAPI spec; not an availability issue.","No dedicated /docs page found (returns 404); all documentation comes from the OpenAPI spec and landing page.","Only US and CA phone numbers (+1) are supported."],"endpointUrl":"https://stablephone.dev/api/number/topup","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stablephone.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.820","qualityRationale":"Full OpenAPI schema with request/response definitions, clear pricing ($15.00), detailed guidance docs, and well-documented payment protocols. The endpoint returned 405 on HEAD/GET probes, which is expected since it only accepts POST. No dedicated docs page exists (404), but the OpenAPI x-guidance and landing page provide thorough 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'/api/number/topup':26 '/call':142 '0.05':153 '0.54':141 '15.00':9,21,50 '20.00':146 '30':6,18,34,148 '405':183 'StablePhone topup' 'accept':176 'account':71 'acquir':156 'ahead':85 'ai':138,168 'ai-driven':167 'alreadi':45 'also':136 'anyon':86 'api':68 'base':59 'bland.ai':173 'bodi':103 'call':78,140,170 'caller':164 'cost':48 'current':38 'date':40 'day':7,19,35,149 'driven':169 'e.164':111 'e.g':113 'e164-phone-format' 'endpoint':80,128,175 'exist':29 'expir':46,124 'expiri':39 'extend':1,13,27 'extend phone number' 'field':107 'format':112 'get':181 'head':179 'id':165 'imessage/facetime':151 'key':69 'lookup':152 'micropay':12,24,65 'micropayment-mpp-tempo' 'micropayment-x402' 'month':84 'mpp':63 'multipl':81 'need':95 'new':123 'no-api-key' 'number':4,16,32,91,109,120,144,155 'offer':137 'origin':99 'outbound':163 'part':130 'per':51 'phone':31,108,119,139,143,154 'phone number renewal' 'phone number subscription' 'phone-number-renewal' 'phone-number-topup' 'post':25,177 'power':171 'prepay':83 'prepay phone number' 'protocol':66 'purchas':100,145 'renew phone line' 'request':102 'requir':73,104 'respons':116 'return':117,182 'settl':55 'singl':106 'stablephon':3,15,30,133,158 'stack':77 'stackable-topups' 'suit':134 'tempo':64 'time':82 'timestamp':126 'today':43 'top':53,75,88 'top up phone' 'top-up':52,74 'up':76 'usdc':11,23,57 'usdc-on-base' 'use':60,161 'via':10,22,56 'x402':61","prices":[{"id":"c901d5f4-93b6-48a6-be1a-32d11687e537","listingId":"2cb6931e-a59b-452a-88bb-060714b8aa5d","amountUsd":"15","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"15000000","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":"15000000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Extend a phone number 30 days"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:54.731Z"}],"sources":[{"listingId":"2cb6931e-a59b-452a-88bb-060714b8aa5d","source":"mpp_dev","sourceId":"stablephone:POST:/api/number/topup","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:54.731Z","lastSeenAt":"2026-04-22T01:15:10.005Z"}],"details":{"listingId":"2cb6931e-a59b-452a-88bb-060714b8aa5d","quickStartSnippet":"curl -X POST https://stablephone.dev/api/number/topup \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"phone_number\": \"+14155551234\"}'\n# Returns 402 — pay with an x402/MPP client, then resend to receive the new expiry.","exampleRequest":{"phone_number":"+14155551234"},"exampleResponse":{"success":true,"expires_at":"2025-08-14T00:00:00.000Z","phone_number":"+14155551234"},"schema":{"path":"/api/number/topup","method":"POST","payment":{"amount":"15000000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Extend a phone number 30 days"},"description":"Extend a phone number 30 days"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Top-up costs $15.00 and extends the number by 30 days from current expiry","source_url":"https://stablephone.dev"},{"claim":"Top-ups stack — call it multiple times to prepay months ahead. Anyone can top up any number.","source_url":"https://stablephone.dev"},{"claim":"Payment via x402 (USDC on Base) or MPP with Tempo method","source_url":"https://stablephone.dev"},{"claim":"Phone number field requires E.164 format matching ^\\+1\\d{10}$","source_url":"https://stablephone.dev/.well-known/x402"},{"claim":"Extends from current expiry or from today if already expired","source_url":"https://stablephone.dev"}],"useCases":["Extending a dedicated AI-calling phone number before it expires","Prepaying multiple months of phone number rental in a single batch","Allowing a third party or agent to keep any StablePhone number active","Automating phone number lifecycle management in an agent workflow"],"bestFor":["AI agents that maintain persistent outbound caller IDs","Automated workflows needing unattended phone number renewal","Developers using x402/MPP micropayment rails without API keys"],"notFor":["Purchasing a new phone number (use POST /api/number instead)","Making phone calls (use POST /api/call instead)","Non-US/CA phone numbers — only +1 numbers are supported"],"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":"2026-04-22T01:15:10.005Z"}}