{"id":"2c8a2208-3a19-4d08-bdf3-e7294405c4e2","shortId":"fwJ25y","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 52) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access via the x402 protocol.\n\nHowever, the specific endpoint being listed here — `/api/v1/emails/52/attachments` — is not documented on the site's landing page among the advertised API categories. Its purpose (retrieving attachments for a specific email with ID 52) is unclear and may be a demo or internal resource. No request/response schema documentation was found beyond the x402 challenge metadata. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-endpoint"],"categories":["storage","email"],"synonyms":["email attachment API","x402 email endpoint","paid email access","Base USDC micropayment","lowpaymentfee email"],"warnings":["The endpoint /api/v1/emails/52/attachments is not listed among the advertised APIs on the landing page — its purpose and general availability are unclear.","No request body schema or response schema documentation is available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.","The hardcoded email ID '52' in the path suggests this may be a demo or single-resource endpoint rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/52/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/52/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 (returns 402 with a valid x402 challenge), but there is no documentation for this specific email attachments endpoint, no request/response schema, and the docs pages are empty. The endpoint path references a hardcoded email ID (52), which raises questions about its general utility. Effectively a stub 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'0.02':10,22,52,113 '000':56 '20':55 '52':37,164 '6':60 'Base USDC micropayment' 'accept':64 'access':30,127 'advertis':75,151 'ai/ml':86 'among':149 'analysi':89 'analyt':85 'api':82,120,152,189 'application/json':69 'attach':3,15,33,157 'base':8,20,49,57 'behind':38 'beyond':181 'broader':72 'call':115 'categori':153 'challeng':184 'classif':91 'connect':197 'content':203 'convers':108 'data':84 'decim':61 'demo':171 'doc':187 'document':142,178 'email':2,14,32,35,161 'email attachment API' 'email-attachments' 'embed':92 'emphas':118 'endpoint':26,63,135 'estim':102 'exchang':97 'feed':96 'financ':93 'found':180 'gas':101 'gate':81 'generat':109 'geocod':106 'howev':132 'id':36,163 'infer':87 'infrastructur':104 'instant':126 'intern':173 'key':121 'land':147 'limit':124 'list':137 'lowpaymentfee email' 'lowpaymentfee.com':28,73 'may':168 'metadata':185 'micropay':6,18 'micropayment' 'network':50 'page':148,192 'paid email access' 'payment':42 'paywal':41 'per':11,23,53,114 'platform':74,117 'post':65 'post-endpoint' 'price':95,111,188 'prompt':199 'protocol':131 'provid':29 'purpos':155 'quot':100 'rate':98,123 'readm':191 'request':12,24,54,66 'request/response':176 'resourc':174 'respons':70 'retriev':1,13,156 'return':68,194 'schema':177 'sentiment':88 'settl':44 'site':145 'span':83 'specif':34,134,160 'substant':202 'suit':77 'summar':90 'token':99 'unclear':166 'unit':58 'usdc':46 'usdc-base' 'util':105 'valid':107 'via':4,16,128 'wallet':198 'web3':94 'x402':5,17,40,80,130,183 'x402 email endpoint' 'x402-gated':79 'x402-payment'","prices":[{"id":"854feb47-826c-4e85-a773-9204d55ea362","listingId":"2c8a2208-3a19-4d08-bdf3-e7294405c4e2","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/52/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":"2026-04-21T18:32:12.225Z"}],"sources":[{"listingId":"2c8a2208-3a19-4d08-bdf3-e7294405c4e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/52/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.225Z","lastSeenAt":"2026-04-22T02:31:50.413Z"}],"details":{"listingId":"2c8a2208-3a19-4d08-bdf3-e7294405c4e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/52/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 x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/emails/52/attachments"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include an emails endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven access to gated email content","Demonstrating x402 payment flows for email data"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing programmatic access to specific email attachments","Low-cost per-request email data retrieval without API keys"],"notFor":["Bulk email processing or mailbox management","Users needing documented request/response schemas before integrating","Production email workflows requiring reliability guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.004Z"},"updatedAt":"2026-04-22T02:31:50.413Z"}}