{"id":"47cebef7-d06c-4c7b-b50e-04eafcc46b9f","shortId":"pybDQr","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 82) 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/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request with no API keys, no rate limits, and no minimum commitments — payment is handled entirely through the x402 protocol using USDC on Base.\n\nThe specific endpoint cataloged here (`/api/v1/emails/82/attachments`) appears to serve attachment data for a particular email resource. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the attachments contain or what parameters the POST body accepts. Prospective callers should be aware of this documentation gap.","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 API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The endpoint references a specific email ID (82); it is unclear whether this is a demo resource or a fixed dataset","Purpose and contents of the email attachments are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/82/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/82/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 a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty stubs showing only 'Connect wallet'. The specific purpose of the email/82/attachments resource is unexplained, making this effectively a stub 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'0.02':10,22,52,117 '000':56 '20':55 '6':60 '82':37 'Base USDC API' 'accept':64,208 'access':30 'advertis':75 'ai/ml':87 'analysi':90 'analyt':86 'api':83,122,169 'appear':149 'application/json':69 'attach':3,15,33,152,200 'awar':213 'base':8,20,49,57,142 'behind':38 'beyond':160 'bodi':207 'broader':72 'call':82 'caller':210 'catalog':146 'classif':92 'commit':130 'connect':178 'contain':201 'convers':109 'data':85,95,153 'decim':61 'descript':196 'detail':185 'doc':168 'document':159,216 'email':2,14,32,35,157 'email attachment API' 'email-attachments' 'embed':93 'endpoint':26,63,112,145 'entir':134 'estim':103 'exampl':193 'exchang':98 'extrem':165 'feed':97 'finance/web3':94 'gap':217 'gas':102 'generat':110 'geocod':107 'handl':133 'id':36 'infer':88 'infrastructur':105 'key':123 'land':162 'limit':126 'lowpaymentfee' 'lowpaymentfee.com':28,73 'micropay':6,18 'micropayment email API' 'minimum':129 'network':50 'no-api-key' 'openapi':189 'page':163,173 'paramet':204 'particular':156 'pay':80 'pay-per-cal':79 'pay-per-call email' 'pay-per-request' 'payment':42,131 'paywal':41 'per':11,23,53,81,118 'platform':74 'post':65,206 'price':96,114,170 'prompt':180 'prospect':209 'protocol':138 'provid':29 'quot':101 'rate':99,125 'readm':172 'render':175 'request':12,24,54,66,119 'request/response':192 'resourc':158 'respons':70 'retriev':1,13 'return':68 'schema':190 'sentiment':89 'serv':151 'settl':44 'span':84 'spars':166 'specif':34,144 'suit':77 'summar':91 'technic':184 'token':100 'uniform':115 'unit':58 'usdc':46,140 'usdc-base' 'use':139 'util':106 'valid':108 'via':4,16 'wallet':179 'x402':5,17,40,137 'x402 email endpoint' 'x402-payment'","prices":[{"id":"f392e846-480c-4e7e-bcfe-73eeba997362","listingId":"47cebef7-d06c-4c7b-b50e-04eafcc46b9f","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/82/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":"2026-04-21T18:32:12.605Z"}],"sources":[{"listingId":"47cebef7-d06c-4c7b-b50e-04eafcc46b9f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/82/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.605Z","lastSeenAt":"2026-04-22T07:01:53.973Z"}],"details":{"listingId":"47cebef7-d06c-4c7b-b50e-04eafcc46b9f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/82/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/emails/82/attachments"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/82/attachments"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven email data extraction without API key management","Paying per-request for on-demand email attachment access"],"bestFor":["Agents that need to fetch email attachments without pre-registration","Developers experimenting with x402 micropayment protocols","Scenarios requiring keyless, pay-as-you-go API access"],"notFor":["Bulk email processing requiring high throughput and predictable pricing","Users who need detailed API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.511Z"},"updatedAt":"2026-04-22T07:01:53.973Z"}}