{"id":"3bb86797-4dbb-4636-b45c-e7b1b2f6c904","shortId":"8H78Xz","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 35) 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 wide catalog of x402-gated APIs spanning data & analytics, AI/ML (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/35/attachments` — is not documented on the site's landing page or in any crawled documentation. Its purpose (retrieving attachments for a specific email) is inferred solely from the URL path and the generic \"Premium API Access\" description in the 402 challenge. No request/response schema, parameter documentation, or usage examples were found. 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":["email","storage"],"synonyms":["email attachment API","x402 email endpoint","paid email access","Base USDC API","micropayment email","lowpaymentfee email"],"warnings":["This specific endpoint (/api/v1/emails/35/attachments) is not listed on the provider's landing page among their advertised APIs","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content","No request body schema or response schema is documented — functionality is inferred from URL path only","The endpoint targets a hardcoded email ID (35), suggesting it may be a demo or test resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/35/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/35/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 challenge) and pricing is clear ($0.02 USDC on Base), but this specific email-attachments endpoint is not documented anywhere on the site. No request/response schema, no examples, and all documentation pages are empty stubs. The endpoint's actual functionality is unclear beyond the URL 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'0.02':10,22,52,113 '000':56 '20':55 '35':37 '402':178 '6':60 'Base USDC API' 'accept':64 'access':30,127,174 'advertis':75 'ai/ml':87 'analysi':89 'analyt':86 'api':83,120,173,193 'application/json':69 'attach':3,15,33,157 'base':8,20,49,57 'behind':38 'broader':72 'call':115 'catalog':78 'challeng':179 'classif':91 'connect':201 'content':207 'convers':108 'crawl':152 'data':85 'decim':61 'descript':175 'doc':191 'document':142,153,184 'email':2,14,32,35,161 'email attachment API' 'email-attachments' 'embed':92 'emphas':118 'endpoint':26,63,135 'estim':102 'exampl':187 'exchang':97 'feed':96 'financ':93 'found':189 'gas':101 'gate':82 'generat':109 'generic':171 'geocod':106 'howev':132 'id':36 'infer':163 'infrastructur':104 'instant':126 'key':121 'land':147 'limit':124 'list':137 'lowpaymentfee email' 'lowpaymentfee.com':28,73 'micropay':6,18 'micropayment' 'micropayment email' 'network':50 'page':148,196 'paid email access' 'paramet':183 'path':168 'payment':42 'paywal':41 'per':11,23,53,114 'platform':74,117 'post':65 'post-endpoint' 'premium':172 'price':95,111,192 'prompt':203 'protocol':131 'provid':29 'purpos':155 'quot':100 'rate':98,123 'readm':195 'request':12,24,54,66 'request/response':181 'respons':70 'retriev':1,13,156 'return':68,198 'schema':182 'sentiment':88 'settl':44 'site':145 'sole':164 'span':84 'specif':34,134,160 'substant':206 'summar':90 'token':99 'unit':58 'url':167 'usag':186 'usdc':46 'usdc-base' 'util':105 'valid':107 'via':4,16,128 'wallet':202 'web3':94 'wide':77 'x402':5,17,40,81,130 'x402 email endpoint' 'x402-gated':80 'x402-payment'","prices":[{"id":"14b160f2-cc7a-4556-a531-960712a22bb2","listingId":"3bb86797-4dbb-4636-b45c-e7b1b2f6c904","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/35/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":"2026-04-21T18:32:11.080Z"}],"sources":[{"listingId":"3bb86797-4dbb-4636-b45c-e7b1b2f6c904","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/35/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.080Z","lastSeenAt":"2026-04-22T02:31:49.222Z"}],"details":{"listingId":"3bb86797-4dbb-4636-b45c-e7b1b2f6c904","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/35/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 challenge with x402Version 1, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/35/attachments"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/35/attachments"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven access to stored email data without API keys","Pay-per-request document retrieval from email storage"],"bestFor":["Agents needing one-off access to email attachments without subscription","Developers experimenting with x402 micropayment protocols","Automated workflows that retrieve specific email documents"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","General-purpose email sending or inbox management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.367Z"},"updatedAt":"2026-04-22T02:31:49.222Z"}}