{"id":"1473f67f-e541-4b32-adfe-43a817f36ff5","shortId":"Gw3WeA","kind":"mpp","title":"Extend a StableEmail forwarding inbox by 30 days for $1 USDC via micropayment.","tagline":"Extend a StableEmail forwarding inbox by 30 days for $1 USDC via micropayment.","description":"This endpoint extends an existing StableEmail forwarding inbox (username@stableemail.dev) by 30 days for $1 USDC. It is part of the StableEmail platform, which provides pay-per-send email delivery, forwarding inboxes, and custom subdomains — all without API keys or accounts. Payments are handled via the x402/MPP micropayment protocol, settling in USDC on Base (eip155:8453), Solana, or Tempo. Anyone can top up any inbox; no wallet ownership proof (SIWX) is required.\n\nThe request body takes a single required field: the username of the inbox to extend. On success, the response includes the new expiration date, total days remaining, and confirmation that 30 days were added. Bulk discount alternatives exist at /api/inbox/topup/quarter (90 days for $2.50, ~17% savings) and /api/inbox/topup/year (365 days for $8, ~34% savings).\n\nStableEmail inboxes can forward to a real email address, retain messages for programmatic API access, or both. Inbox owners can also send from their inbox address ($0.005/email), check status, update forwarding settings, and cancel with a pro-rata USDC refund. The recommended agent integration path is via agentcash-skills (MCP server or CLI), which handles payment negotiation automatically.","tags":["email","send","inbox","forwarding","subdomain"],"capabilities":["email-inbox-topup","forwarding-inbox","micropayment-email","x402-payment","mpp-payment","usdc-settlement","base-chain","solana-chain","tempo-chain","duration-extension","no-auth-required"],"categories":["email","payments"],"synonyms":["email inbox renewal","inbox extension","forwarding inbox topup","stableemail topup","email subscription renewal","inbox 30 day extend","pay per use email inbox","micropayment email inbox"],"warnings":["Probe returned 405 on HEAD/GET because this is a POST-only endpoint; not an indication of downtime","No dedicated /docs page exists (returns 404); documentation is embedded in OpenAPI x-guidance and the landing page"],"endpointUrl":"https://stableemail.dev/api/inbox/topup","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stableemail.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 schema with detailed x-guidance documentation, clear pricing ($1 USDC), and complete request/response structure. The endpoint returned 405 on HEAD/GET probes, which is expected since it's a POST-only endpoint — the OpenAPI spec confirms it is live. No dedicated docs page exists (404), but the llms.txt guidance is 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'/api/inbox/topup/year':146 '/email':180 '0.005':179 '1':10,23,40 '17':143 '2.50':142 '30':7,20,37,129 '34':151 '365':147 '8':150 '8453':82 '90':139 'access':167 'account':67 'ad':132 'address':161,178 'agent':197 'agentcash':203 'agentcash-skil':202 'also':173 'altern':135 'anyon':86 'api':64,166 'automat':213 'base':80 'base-chain' 'bodi':101 'bulk':133 'cancel':187 'check':181 'cli':208 'confirm':127 'custom':60 'date':122 'day':8,21,38,124,130,140,148 'deliveri':56 'discount':134 'duration-extension' 'eip155':81 'email':55,160 'email inbox renewal' 'email subscription renewal' 'email-inbox-topup' 'endpoint':28 'exist':31,136 'expir':121 'extend':1,14,29,113 'field':106 'forward':4,17,33,57,156,184 'forwarding inbox topup' 'forwarding-inbox' 'handl':70,210 'inbox':5,18,34,58,91,111,154,170,177 'inbox 30 day extend' 'inbox extension' 'includ':118 'integr':198 'key':65 'mcp':205 'messag':163 'micropay':13,26,74 'micropayment email inbox' 'micropayment-email' 'mpp-payment' 'negoti':212 'new':120 'no-auth-required' 'owner':171 'ownership':94 'part':44 'path':199 'pay':52 'pay per use email inbox' 'pay-per-send':51 'payment':68,211 'per':53 'platform':48 'pro':191 'pro-rata':190 'programmat':165 'proof':95 'protocol':75 'provid':50 'rata':192 'real':159 'recommend':196 'refund':194 'remain':125 'request':100 'requir':98,105 'respons':117 'retain':162 'save':144,152 'send':54,174 'server':206 'set':185 'settl':76 'singl':104 'siwx':96 'skill':204 'solana':83 'solana-chain' 'stableemail':3,16,32,47,153 'stableemail topup' 'status':182 'subdomain':61 'success':115 'take':102 'tempo':85 'tempo-chain' 'top':88 'total':123 'updat':183 'usdc':11,24,41,78,193 'usdc-settlement' 'usernam':108 'username@stableemail.dev':35 'via':12,25,71,201 'wallet':93 'without':63 'x402-payment' 'x402/mpp':73","prices":[{"id":"e310baa5-19dc-4d55-9e8b-e21e90700e3e","listingId":"1473f67f-e541-4b32-adfe-43a817f36ff5","amountUsd":"1","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"1000000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"stableemail.dev","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"1000000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Extend inbox 30 days"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:28.802Z"}],"sources":[{"listingId":"1473f67f-e541-4b32-adfe-43a817f36ff5","source":"mpp_dev","sourceId":"stableemail:POST:/api/inbox/topup","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:28.802Z","lastSeenAt":"2026-04-22T02:45:06.209Z"}],"details":{"listingId":"1473f67f-e541-4b32-adfe-43a817f36ff5","quickStartSnippet":"# Top up an inbox for 30 days ($1 USDC)\ncurl -X POST https://stableemail.dev/api/inbox/topup \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"username\": \"alice\"}'\n# Returns 402 → pay with any x402/MPP client → resend with payment header","exampleRequest":{"username":"alice"},"exampleResponse":{"inbox":"alice","success":true,"daysAdded":30,"expiresAt":"2025-08-15T00:00:00.000Z","daysRemaining":45},"schema":{"path":"/api/inbox/topup","method":"POST","payment":{"amount":"1000000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Extend inbox 30 days"},"description":"Extend inbox 30 days"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Top up inbox 30 days costs $1 USDC","source_url":"https://stableemail.dev"},{"claim":"Anyone can top up any inbox — no SIWX required","source_url":"https://stableemail.dev"},{"claim":"Payment settles in USDC on Base, Solana, or Tempo via x402/MPP","source_url":"https://stableemail.dev"},{"claim":"Bulk discounts: 90 days for $2.50 (save 17%), 365 days for $8 (save 34%)","source_url":"https://stableemail.dev"},{"claim":"Cancel anytime for a pro-rata refund","source_url":"https://stableemail.dev"},{"claim":"Response includes success, inbox, expiresAt, daysRemaining, daysAdded fields","source_url":"https://stableemail.dev/.well-known/x402"}],"useCases":["Automatically renew a forwarding inbox for an AI agent that needs a persistent email address","Top up a teammate's or friend's inbox without needing their wallet credentials","Programmatically maintain inbox availability in a scheduled cron job","Keep a disposable email address alive for ongoing project communications"],"bestFor":["AI agents needing persistent email addresses without account management","Developers who want programmatic inbox lifecycle management via micropayments","Users who want anonymous or wallet-based email forwarding with no signup"],"notFor":["High-volume transactional email (use dedicated ESP like SendGrid or SES directly)","Users who need traditional email hosting with IMAP/SMTP client access"],"kindDetails":{"docs":{"llmsTxt":"https://stableemail.dev/llms.txt","homepage":"https://stableemail.dev"},"tags":["email","send","inbox","forwarding","subdomain"],"realm":"stableemail.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stableemail.dev","name":"Merit Systems"},"categories":["social"],"service_id":"stableemail","integration":"first-party","service_name":"StableEmail","service_description":"Pay-per-send email delivery, forwarding inboxes, and custom subdomains — no API keys or accounts."},"updatedAt":"2026-04-22T02:45:06.209Z"}}