{"id":"c9d49aa0-547f-4805-b6b4-61f8628972f1","shortId":"QtYsjZ","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 68) 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 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose of the email attachments endpoint (what data it returns, what input it expects) is unclear from the available material. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-endpoint","json-response"],"categories":["storage","email"],"synonyms":["email attachment API","x402 email endpoint","paid email API","Base USDC micropayment","lowpaymentfee email","402 email attachments"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific function of /api/v1/emails/68/attachments is unclear — it may be a demo or placeholder endpoint","No examples of expected input or output are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/68/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/68/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 spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of this email attachments endpoint is unclear. The listing is effectively a 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'/docs':135 '/pricing':136 '/readme':139 '/request':117 '0.02':10,22,52,116 '000':56 '20':55 '402 email attachments' '6':60 '68':37 'Base USDC micropayment' 'accept':64 'access':30 'advertis':75 'ai/ml':86 'analysi':89 'analyt':85 'api':82,121 'application/json':69 'attach':3,15,33,173 'avail':166,187 'base':8,20,49,57 'behind':38 'broader':72 'challeng':191 'classif':91 'commit':129 'confirm':198 'connect':145 'convers':109 'data':84,95,176 'decim':61 'detail':152 'document':130,161 'email':2,14,32,35,172 'email attachment API' 'email-attachments' 'embed':92 'endpoint':26,63,112,174,200 'estim':103 'exampl':164 'exchang':98 'expect':182 'extrem':132 'feed':97 'financ':93 'form':197 'gas':102 'gate':81 'generat':110 'geocod':107 'id':36 'infer':87 'infrastructur':105 'input':180 'json-response' 'key':122 'limit':125 'live':193 'lowpaymentfee email' 'lowpaymentfee.com':28,73 'materi':188 'micropay':6,18 'micropayment' 'minimum':128 'network':50 'openapi':156 'oper':202 'page':140 'paid email API' 'payload':165 'payment':42 'paywal':41 'per':11,23,53 'platform':74 'post':65 'post-endpoint' 'price':96,118 'prompt':147 'provid':29 'purpos':169 'quot':101 'rate':99,124 'render':142 'request':12,24,54,66 'request/response':159 'respons':70 'retriev':1,13 'return':68,178 'schema':160 'sentiment':88 'settl':44 'share':113 'span':83 'spars':133 'spec':157 'specif':34,168 'suit':77 'summar':90 'technic':151 'token':100 'unclear':184 'unit':58 'usdc':46 'usdc-base' 'util':106 'valid':108 'via':4,16 'wallet':146 'web3':94 'well':196 'well-form':195 'x402':5,17,40,80,190 'x402 email endpoint' 'x402-gated':79 'x402-payment'","prices":[{"id":"765a78db-ec78-4402-8a53-560ef9f443c1","listingId":"c9d49aa0-547f-4805-b6b4-61f8628972f1","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/68/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":"2026-04-21T18:32:12.646Z"}],"sources":[{"listingId":"c9d49aa0-547f-4805-b6b4-61f8628972f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/68/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.646Z","lastSeenAt":"2026-04-22T01:02:05.404Z"}],"details":{"listingId":"c9d49aa0-547f-4805-b6b4-61f8628972f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/68/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/68/attachments"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/68/attachments"}],"useCases":["Programmatically retrieving email attachments via micropayment","Agent-driven access to stored email data without API key management","Pay-per-request email attachment downloads on Base network"],"bestFor":["Agents needing on-demand email attachment retrieval without subscription","Developers experimenting with x402 payment flows","Use cases requiring keyless, pay-per-call API access"],"notFor":["Bulk email processing (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.382Z"},"updatedAt":"2026-04-22T01:02:05.404Z"}}