{"id":"3e0e4aff-c452-470d-a196-666cbec0c5b0","shortId":"G4ySBh","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 71) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or subscriptions required.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/emails/71/attachments` endpoint. The endpoint's purpose and response schema are not documented beyond the generic \"Premium API Access\" label, so the exact structure of the returned attachment data is unknown.\n\nThe endpoint is live: it returns a well-formed x402 version 1 challenge with an \"exact\" payment scheme targeting USDC (contract 0x8335…2913) on Base. The payment recipient is 0x1A2B…85F3 with a 300-second timeout. No OpenAPI spec, detailed docs, or example responses were found in the crawl — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional technical content.","tags":[],"capabilities":["x402-payment","email-attachments","usdc-base","micropayment","post-endpoint"],"categories":["email","storage"],"synonyms":["email attachment API","x402 email","paid email access","Base USDC API","micropayment email endpoint","lowpaymentfee email"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","Endpoint is scoped to a single email ID (71); unclear if other email IDs are supported.","Docs, pricing, and API pages render only a wallet-connect prompt with no technical content.","The exact nature of the 'email attachments' data is undocumented — could be demo/test data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/71/attachments","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/emails/71/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond a wallet-connect prompt. The endpoint path suggests a single hardcoded email ID (71), and the purpose of the attachment data is unclear. Effectively a stub 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'0.02':10,22,60,72,113 '000':66 '0x1a2b':183 '0x8335':175 '1':165 '20':65 '2913':176 '300':187 '6':70 '71':37 '85f3':184 'Base USDC API' 'accept':44 'access':30,140 'addit':219 'ai/ml':97 'analysi':100 'analyt':96 'api':75,93,139,207 'attach':3,15,33,149 'base':8,20,57,67,178 'behind':38 'beyond':135 'broader':87 'call':62 'challeng':166 'classif':102 'connect':215 'content':221 'contract':174 'cover':120 'crawl':202 'data':95,105,150 'decim':71 'detail':193 'doc':194,204 'document':134 'email':2,14,32,35 'email attachment API' 'email-attachments' 'embed':103 'endpoint':26,43,124,126,154 'exact':144,169 'exampl':196 'feed':106 'finance/crypto':104 'form':162 'found':199 'gate':92 'generic':137 'host':85 'howev':116 'id':36 'infer':98 'infrastructur':108 'json':49 'key':76 'label':141 'limit':78 'list':119 'live':156 'lowpaymentfee email' 'lowpaymentfee.com':28,84 'maxamountrequir':63 'micropay':6,18 'micropayment' 'micropayment email endpoint' 'network':58 'openapi':191 'page':208 'paid email access' 'payment':50,170,180 'paywal':41 'per':11,23,61,114 'post':45 'post-endpoint' 'premium':138 'price':111,205 'prompt':216 'provid':29,83 'purpos':128 'rate':77 'recipi':181 'render':210 'request':12,24,46,115 'requir':81 'respons':130,197 'retriev':1,13 'return':48,148,158 'schema':131 'scheme':171 'second':188 'sentiment':99 'settl':52 'span':94 'spec':192 'specif':34,118 'structur':145 'subscript':80 'suit':88 'summar':101 'target':172 'technic':220 'timeout':189 'unit':68 'unknown':152 'usdc':54,173 'usdc-base' 'util':109 'version':164 'via':4,16 'wallet':214 'wallet-connect':213 'well':161 'well-form':160 'x402':5,17,40,91,163 'x402 email' 'x402-gated':90 'x402-payment'","prices":[{"id":"2db63098-9885-479a-85a8-efaaa72da75c","listingId":"3e0e4aff-c452-470d-a196-666cbec0c5b0","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/emails/71/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.647Z"}],"sources":[{"listingId":"3e0e4aff-c452-470d-a196-666cbec0c5b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/71/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.647Z","lastSeenAt":"2026-04-22T01:02:05.407Z"}],"details":{"listingId":"3e0e4aff-c452-470d-a196-666cbec0c5b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/71/attachments \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/71/attachments"},{"claim":"All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/71/attachments"}],"useCases":["Programmatically retrieving email attachments via a pay-per-request model","Agent-driven workflows that need to fetch specific email attachment data without API key provisioning","Demonstrating x402 micropayment integration on the Base network"],"bestFor":["Agents or scripts that need one-off email attachment retrieval without signup","Developers experimenting with x402 payment protocol on Base","Workflows requiring keyless, pay-as-you-go API access"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed documentation or guaranteed SLAs","Accessing arbitrary email IDs (this endpoint is hardcoded to email 71)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.381Z"},"updatedAt":"2026-04-22T01:02:05.407Z"}}