{"id":"f93e00a1-86ea-4f25-ac17-3b3cfe62ec06","shortId":"Lu77qY","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).","tagline":"Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 59) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broader 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 request with no API keys, no rate limits, and no commitments. However, this specific endpoint is narrowly scoped to retrieving attachments for a single email resource.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the attachments contain or what parameters the POST body expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.","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 micropayment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; request body format is unknown.","Endpoint targets a specific email ID (59) with no explanation of what data it contains or how to access other emails.","The broader site advertises many API categories but none appear documented beyond landing-page listings."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/59/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/59/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 all documentation pages returned only 'Connect wallet' with no content. The endpoint path targets a single hardcoded email ID (59), which is unusual and 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'/docs':154 '/pricing':156 '/readme':158 '/request':11,22 '0.02':10,21,71,120 '000':66 '0x8335':58 '20':65 '2913':59 '402':199 '59':35 '6':76 'Base USDC micropayment API' 'accept':42 'access':28 'ai/ml':93 'analysi':96 'analyt':92 'api':89,125 'attach':3,14,31,142,185 'base':8,19,53,67 'behind':36 'bodi':192 'broader':83 'captur':201 'challeng':200 'classif':98 'commit':132 'confirm':197 'connect':164 'contain':186 'content':170 'contract':57 'convers':115 'cost':63 'crawl':153 'data':91 'decim':77 'descript':181 'difficult':209 'document':148,206 'email':2,13,30,33,146 'email attachment API' 'email-attachments' 'embed':99 'endpoint':24,41,136,195 'equal':70 'estim':109 'exampl':178 'exchang':104 'expect':193 'experiment':213 'extrem':150 'feed':103 'financ':100 'gas':108 'gate':88 'generat':116 'geocod':113 'host':81 'howev':133 'id':34 'infer':94 'infrastructur':111 'json':47 'key':126 'lack':204 'limit':129 'live':198 'lowpaymentfee email' 'lowpaymentfee.com':26,80 'make':207 'maximum':62 'micropay':6,17 'micropayment' 'narrowli':138 'network':54 'openapi':174 'page':159 'paid email data' 'paramet':189 'payment':48 'paywal':39 'per':72,121 'post':43,191 'post-endpoint' 'price':102,118 'prompt':166 'provid':27,79 'quot':107 'rate':105,128 'request':44,73,122 'request/response':177 'resourc':147 'retriev':1,12,141 'return':46,161 'schema':175 'scope':139 'sentiment':95 'settl':50 'singl':145 'span':90 'spars':151 'specif':32,135 'substant':169 'suit':84 'summar':97 'token':106 'unit':68 'usdc':9,20,56,74 'usdc-base' 'use':55,75,211 'util':112 'valid':114 'via':4,15 'wallet':165 'web3':101 'without':212 'x402':5,16,38,87 'x402 email endpoint' 'x402-gated':86 'x402-payment'","prices":[{"id":"71fbfb49-0588-407b-89f7-c50115793df6","listingId":"f93e00a1-86ea-4f25-ac17-3b3cfe62ec06","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/59/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":"2026-04-21T18:32:11.233Z"}],"sources":[{"listingId":"f93e00a1-86ea-4f25-ac17-3b3cfe62ec06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/59/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.233Z","lastSeenAt":"2026-04-22T09:02:00.943Z"}],"details":{"listingId":"f93e00a1-86ea-4f25-ac17-3b3cfe62ec06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/59/attachments \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/emails/59/attachments"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/59/attachments"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"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 keyless, pay-per-call access to email attachments","Developers experimenting with x402 protocol payments on Base","Workflows requiring on-demand email attachment retrieval"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","General-purpose email sending or inbox management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.186Z"},"updatedAt":"2026-04-22T09:02:00.943Z"}}