{"id":"009ea12c-08b2-43ab-bc41-5fb4206b155e","shortId":"CDpxPK","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 for email ID 80) 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 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 request with no API keys, no rate limits, and no commitments required. However, the specific endpoint being listed here is scoped to email attachments.\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 explanation of what the email attachments endpoint actually returns or what parameters it accepts. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to understand the expected input format or output structure.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-endpoint"],"categories":["data","email"],"synonyms":["email attachment API","x402 email endpoint","paid email data","lowpaymentfee email","Base USDC API","micropayment email attachments"],"warnings":["No API documentation available — docs, pricing, and README pages are empty beyond a wallet connect prompt","Endpoint path references a hardcoded email ID (80); unclear if this is parameterizable or a demo","No request body schema or response schema documented anywhere","No OpenAPI spec or ai-plugin manifest found","The platform lists many API categories but no evidence any return real data beyond the x402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/80/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/80/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The endpoint path (/emails/80/attachments) is oddly specific with no explanation. Effectively a stub 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'000':57 '20':56 '6':61 '80':38 'Base USDC API' 'accept':65,181 'access':30 'actual':175 'advertis':76 'ai/ml':84 'analysi':86 'analyt':83 'api':80,115,142 'application/json':70 'attach':3,15,33,135,173 'base':8,20,50,58 'behind':39 'broader':73 'challeng':184 'classif':88 'commit':122 'confirm':191 'connect':151 'content':157 'convers':105 'data':82 'decim':62 'difficult':203 'doc':141 'document':136,200 'email':2,14,32,36,134,172 'email attachment API' 'email-attachments' 'embed':89 'endpoint':26,64,127,174,193 'estim':99 'exampl':165 'exchang':94 'expect':207 'explan':168 'extrem':138 'feed':93 'financ':90 'form':190 'format':209 'gas':98 'generat':106 'geocod':103 'howev':124 'id':37 'infrastructur':101 'input':208 'key':116 'lack':198 'limit':119 'list':129 'live':186 'lowpaymentfee email' 'lowpaymentfee.com':28,74 'make':201 'micropay':6,18 'micropayment' 'micropayment email attachments' 'network':51 'openapi':161 'oper':195 'output':211 'page':146 'paid email data' 'paramet':179 'payment':43 'paywal':42 'per':11,23,54,111 'platform':75 'post':66 'post-endpoint' 'price':92,108,143 'prompt':153 'provid':29 'quot':97 'rate':95,118 'readm':145 'render':148 'request':12,24,55,67,112 'request/response':164 'requir':123 'respons':71 'retriev':1,13 'return':69,176 'schema':162 'scope':132 'sentiment':85 'settl':45 'span':81 'spars':139 'specif':34,126 'structur':212 'substant':156 'suit':78 'summar':87 'token':96 'understand':205 'unit':59 'usdc':47 'usdc-base' 'util':102 'valid':104 'via':4,16 'wallet':152 'web3':91 'well':189 'well-form':188 'x402':5,17,41,183 'x402 email endpoint' 'x402-payment'","prices":[{"id":"bd0130ac-6c65-432a-aa1a-734dedfd35f9","listingId":"009ea12c-08b2-43ab-bc41-5fb4206b155e","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/80/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":"2026-04-21T18:32:12.782Z"}],"sources":[{"listingId":"009ea12c-08b2-43ab-bc41-5fb4206b155e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/80/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.782Z","lastSeenAt":"2026-04-22T04:02:25.533Z"}],"details":{"listingId":"009ea12c-08b2-43ab-bc41-5fb4206b155e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/80/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 network","source_url":"https://lowpaymentfee.com/api/v1/emails/80/attachments"},{"claim":"Platform pricing is $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/80/attachments"}],"useCases":["Retrieving attachments from a specific email record via programmatic API call","Demonstrating x402 micropayment integration for data access","Agent-driven email data retrieval with per-request crypto payment"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing to fetch email attachment data with no API key setup","Low-volume, pay-per-use email data access"],"notFor":["Bulk email processing or mailbox management","Users who need detailed API documentation before integrating","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.251Z"},"updatedAt":"2026-04-22T04:02:25.533Z"}}