{"id":"7139cabe-0a40-432b-924a-e3fcbcb36643","shortId":"575vhY","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 88) 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/88/attachments`) is not documented on the site's landing page among the advertised API categories. Its purpose — retrieving attachments for a specific email — is unclear in context. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine what data it actually returns or what input it expects.","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 API","micropayment email","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/emails/88/attachments path is not listed among the site's advertised APIs — its purpose is unclear","All doc/pricing/API pages render only 'Connect wallet' with no usable content","No request body schema or response examples available — integration requires guesswork","Endpoint appears to target a hardcoded email ID (88), which may indicate a demo or test resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/88/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/88/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 and returns a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific email attachments endpoint is not listed among the site's advertised APIs, making its purpose and expected behavior unclear. This is effectively a stub 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'0.02':10,22,52,113 '000':56 '20':55 '402':199 '6':60 '88':37 'Base USDC API' 'accept':64 'access':30,127 'actual':214 'addit':190 'advertis':75,151 'ai/ml':86 'among':149 'analysi':89 'analyt':85 'api':82,120,152,179 'application/json':69 'attach':3,15,33,157 'base':8,20,49,57 'behind':38 'broader':72 'call':115 'categori':153 'challeng':200 'classif':91 'connect':185 'context':165 'convers':108 'data':84,212 'decim':61 'determin':210 'difficult':208 'doc':176 'document':142,191,205 'email':2,14,32,35,161 'email attachment API' 'email-attachments' 'embed':92 'emphas':118 'endpoint':26,63,135,193 'estim':102 'exampl':173 'exchang':97 'expect':220 'feed':96 'financ':93 'gas':101 'gate':81 'generat':109 'geocod':106 'howev':132 'id':36 'infer':87 'infrastructur':104 'input':218 'instant':126 'key':121 'lack':203 'land':147 'limit':124 'list':137 'live':195 'lowpaymentfee' 'lowpaymentfee.com':28,73 'make':206 'micropay':6,18 'micropayment' 'micropayment email' 'network':50 'openapi':169 'page':148,180 'paid email access' 'payment':42 'paywal':41 'per':11,23,53,114 'platform':74,117 'post':65 'post-endpoint' 'price':95,111,177 'prompt':187 'protocol':131 'provid':29 'purpos':155 'quot':100 'rate':98,123 'render':182 'request':12,24,54,66 'request/response':172 'respons':70 'retriev':1,13,156 'return':68,196,215 'schema':170 'sentiment':88 'settl':44 'site':145 'span':83 'specif':34,134,160 'suit':77 'summar':90 'token':99 'unclear':163 'unit':58 'usdc':46 'usdc-base' 'util':105 'valid':107,198 'via':4,16,128 'wallet':186 'web3':94 'x402':5,17,40,80,130 'x402 email endpoint' 'x402-gated':79 'x402-payment'","prices":[{"id":"35eb60fe-1782-44ef-84a5-591a1fd12ca5","listingId":"7139cabe-0a40-432b-924a-e3fcbcb36643","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/88/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":"2026-04-21T18:32:13.127Z"}],"sources":[{"listingId":"7139cabe-0a40-432b-924a-e3fcbcb36643","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/88/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:13.127Z","lastSeenAt":"2026-04-22T01:02:05.999Z"}],"details":{"listingId":"7139cabe-0a40-432b-924a-e3fcbcb36643","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/88/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 requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/88/attachments"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/88/attachments"},{"claim":"The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven access to email data without API keys","Pay-per-request email attachment download"],"bestFor":["Agents needing one-off email attachment retrieval without signup","Developers experimenting with x402 micropayment protocols","Automated workflows that need to fetch specific email attachments"],"notFor":["Bulk email processing or mailbox management","Users who need documented request/response schemas before integrating","Production systems requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.662Z"},"updatedAt":"2026-04-22T01:02:05.999Z"}}