{"id":"fdb437f8-8daf-4c6f-adb7-43294f5cc58f","shortId":"8TmVep","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 65) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply include the X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a range of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint (/api/v1/emails/65/attachments) is not listed on the site's landing page among the advertised APIs. Its purpose — retrieving attachments for a specific email — is unclear in context and may be a demo, test, or niche data endpoint. Documentation beyond the landing page is effectively empty (all doc/pricing/API pages only show a \"Connect wallet\" prompt).\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation explaining what this endpoint actually returns or what input it expects, the listing is largely inferred from the x402 challenge and the site's general pricing model. Treat this as a low-documentation endpoint with verified liveness.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-json"],"categories":["data","email"],"synonyms":["email attachment API","x402 email endpoint","pay-per-request email","Base USDC API","lowpaymentfee email","micropayment email attachments"],"warnings":["No API documentation available — all doc pages show only 'Connect wallet' with no content","This specific endpoint (/api/v1/emails/65/attachments) is not listed among the site's advertised APIs","No request or response schema provided; input/output format is unknown","The endpoint references a hardcoded email ID (65), suggesting it may be a demo or test resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/65/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/65/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation. The endpoint path (emails/65/attachments) is not listed among the site's advertised APIs, making its purpose uncertain. Effectively a stub 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'0.02':10,22,65,123 '000':71 '20':70 '6':75 '65':37 'Base USDC API' 'accept':44 'access':30 'actual':199 'advertis':103,142 'ai':112 'among':140 'analyt':111 'api':78,107,143 'attach':3,15,33,147 'base':8,20,55,72 'behind':38 'beyond':167 'broader':100 'caller':85 'categori':108 'challeng':214 'coin':60 'connect':180 'context':155 'cost':63 'data':110,164 'decim':76 'demo':160 'doc/pricing/api':175 'document':166,194,228 'effect':172 'email':2,14,32,35,151 'email attachment API' 'email-attachments' 'empti':173 'endpoint':26,43,129,165,198,229 'exampl':191 'expect':205 'explain':195 'financ':115 'general':219 'header':92 'howev':126 'id':36 'includ':87,109 'infer':210 'infrastructur':118 'input':203 'json':49 'key':79 'land':138,169 'larg':209 'learn':114 'limit':82 'list':133,207 'live':232 'low':227 'low-document':226 'lowpaymentfee email' 'lowpaymentfee.com':28,101 'machin':113 'maxamountrequir':68 'may':157 'micropay':6,18 'micropayment' 'micropayment email attachments' 'model':221 'network':56 'nich':163 'openapi':187 'page':139,170,176 'pay-per-request email' 'payment':50,91,97 'paywal':41 'per':11,23,66,124 'platform':102 'post':45 'post-json' 'price':121,220 'prompt':182 'proof':98 'provid':29 'purpos':145 'rang':105 'rate':81 'request':12,24,46,67,125 'request/response':190 'requir':84 'retriev':1,13,146 'return':48,200 'schema':188 'settl':52 'show':178 'simpli':86 'site':136,217 'specif':34,128,150 'test':161 'treat':222 'unclear':153 'unit':73 'usd':59 'usdc':58 'usdc-base' 'use':57 'util':119 'valid':95 'verifi':231 'via':4,16 'wallet':181 'web3':116 'x':90 'x-payment':89 'x402':5,17,40,96,213 'x402 email endpoint' 'x402-payment'","prices":[{"id":"6a615e37-7fc1-4d7f-b3c1-ef7ac1b4f2b1","listingId":"fdb437f8-8daf-4c6f-adb7-43294f5cc58f","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/65/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":"2026-04-21T18:32:12.496Z"}],"sources":[{"listingId":"fdb437f8-8daf-4c6f-adb7-43294f5cc58f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/65/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.496Z","lastSeenAt":"2026-04-22T07:01:53.850Z"}],"details":{"listingId":"fdb437f8-8daf-4c6f-adb7-43294f5cc58f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/65/attachments \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/65/attachments"},{"claim":"The site 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/65/attachments"}],"useCases":["Retrieving email attachments programmatically with per-request micropayment","Agent-driven workflows that need to fetch specific email data without API key provisioning","Demonstrating x402 payment protocol integration on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call access to email attachment data","Low-volume, on-demand email attachment retrieval"],"notFor":["Bulk email processing or high-volume attachment downloads","Users who need detailed API documentation or guaranteed SLAs","General-purpose email service (send, receive, manage)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.637Z"},"updatedAt":"2026-04-22T07:01:53.850Z"}}