{"id":"270abcdd-b25e-44c1-b100-36544c192c2f","shortId":"SdhZPX","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 48) 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 pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required. However, this specific listing is for the email attachments endpoint (`/api/v1/emails/48/attachments`), which is not prominently featured on the site's landing page among the advertised API categories.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the email attachments endpoint actually returns or what parameters it accepts. The endpoint is confirmed live via a valid x402 402 challenge, but the actual functionality and data behind it remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","pay-per-request","no-api-key"],"categories":["data","email"],"synonyms":["email attachment API","x402 email endpoint","micropayment email API","Base USDC API","pay-per-call email","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","This specific endpoint (/api/v1/emails/48/attachments) is not listed among the site's advertised APIs, raising questions about its intended use.","No request or response schema is available; input parameters and output format are unknown.","The endpoint references a hardcoded email ID (48), suggesting it may be a demo or test resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/48/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/48/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 (valid x402 402 challenge captured), but documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, no explanation of what the endpoint returns. The email attachments path is not listed among the site's advertised APIs, making its purpose unclear. This is effectively a stub 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'0.02':10,22,52,105 '000':56 '20':55 '402':201 '48':37 '6':60 'Base USDC API' 'accept':64,191 'access':30 'actual':185,205 'advertis':75,143 'ai/ml':87 'among':141 'analysi':90 'analyt':86 'api':83,110,144,152 'application/json':69 'attach':3,15,33,127,183 'base':8,20,49,57 'behind':38,209 'broader':72 'call':82 'categori':145 'challeng':202 'classif':92 'commit':117 'confirm':195 'connect':161 'content':167 'crypto':96 'data':85,97,208 'decim':61 'descript':178 'doc':151 'document':146 'email':2,14,32,35,126,182 'email attachment API' 'email-attachments' 'embed':93 'endpoint':26,63,128,184,193 'exampl':175 'extrem':148 'featur':134 'feed':98 'financ':94 'function':206 'howev':119 'id':36 'infer':88 'infrastructur':100 'key':111 'land':139 'limit':114 'list':122 'live':196 'lowpaymentfee' 'lowpaymentfee.com':28,73 'micropay':6,18 'micropayment email API' 'network':50 'no-api-key' 'openapi':171 'page':140,156 'paramet':189 'pay':80 'pay-per-cal':79 'pay-per-call email' 'pay-per-request' 'payment':42 'paywal':41 'per':11,23,53,81,106 'platform':74 'post':65 'price':103,153 'promin':133 'prompt':163 'provid':29 'rate':113 'readm':155 'remain':211 'render':158 'request':12,24,54,66,107 'request/response':174 'requir':118 'respons':70 'retriev':1,13 'return':68,186 'schema':172 'sentiment':89 'settl':44 'site':137 'span':84 'spars':149 'specif':34,121 'substant':166 'suit':77 'summar':91 'unclear':212 'unit':58 'usdc':46 'usdc-base' 'util':101 'valid':199 'via':4,16,197 'wallet':162 'x402':5,17,40,200 'x402 email endpoint' 'x402-payment'","prices":[{"id":"192fdf1d-e9c8-411c-9a02-101dca610940","listingId":"270abcdd-b25e-44c1-b100-36544c192c2f","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/48/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":"2026-04-21T18:32:12.270Z"}],"sources":[{"listingId":"270abcdd-b25e-44c1-b100-36544c192c2f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/48/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.270Z","lastSeenAt":"2026-04-22T07:01:53.596Z"}],"details":{"listingId":"270abcdd-b25e-44c1-b100-36544c192c2f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/48/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 maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/48/attachments"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email attachments programmatically via micropayment","Integrating email data access into agent workflows without API key management","Paying per-request for on-demand email attachment retrieval"],"bestFor":["Agents needing one-off email attachment retrieval without subscription overhead","Developers experimenting with x402 payment protocol integrations","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 API documentation or guaranteed SLAs","Use cases requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.002Z"},"updatedAt":"2026-04-22T07:01:53.596Z"}}