{"id":"550a9070-2795-4718-a9d2-0afa75359f15","shortId":"EY9dvz","kind":"x402","title":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","description":"This x402-enabled endpoint at `/api/v1/emails/79` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) at a cost of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — payment is handled inline via the x402 protocol's `X-PAYMENT` header.\n\nThe specific endpoint `/api/v1/emails/79` is listed under \"Premium API Access\" but its exact functionality is not documented in the available crawl material. Based on the URL path (`/emails/79`), it likely returns data associated with a specific email resource (ID 79). The response MIME type is `application/json`. The endpoint accepts HTTP POST requests and is discoverable.\n\nThe broader lowpaymentfee.com platform advertises additional endpoints across categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per-request price point. Documentation pages (`/docs`, `/pricing`, `/README`) returned minimal content (only a \"Connect wallet\" prompt), so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key","http-post"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","micropayment API","pay-per-call email"],"warnings":["No request or response schema available for /api/v1/emails/79","Documentation pages (/docs, /pricing, /README) contain no useful content — only a 'Connect wallet' prompt","The exact purpose of the /emails/79 endpoint is unclear; 'Premium API Access' is a generic label used across the platform","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/79","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /emails/79 endpoint specifically — no request schema, no response schema, no examples. The docs, pricing, and README pages all returned only a 'Connect wallet' stub. The endpoint's actual purpose is inferred from its URL path 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'/call':17,34 '/docs':202 '/emails/79':138 '/pricing':203 '/readme':204 '0.02':16,33,82,194 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':77 '79':150 'Base network API' 'USDC API' 'accept':159 'access':120 'across':173 'addit':171 'advertis':170 'ai/ml':61 'analysi':177 'analyt':60 'api':57,89,119 'application/json':156 'associ':143 'avail':130 'base':9,26,72,133 'base-network' 'broader':167 'call':67 'categori':174 'classif':180 'collect':51 'commit':97 'connect':210 'content':207 'contract':76 'cost':80 'crawl':131 'data':6,23,59,142 'detail':214 'discover':165 'document':127,200 'email':5,22,147 'email API' 'email-data' 'embed':181 'enabl':38 'endpoint':7,24,39,113,158,172 'exact':123 'exchang':184 'feed':183 'financ':62 'function':124 'geocod':186 'handl':100 'header':110 'http':160 'http-post' 'id':149 'includ':175 'infrastructur':63 'inlin':101 'json-response' 'key':90 'like':140 'limit':93 'list':116 'lowpaymentfee' 'lowpaymentfee.com':46,168 'materi':132 'micropayment API' 'mime':153 'minim':206 'network':73 'no-api-key' 'offer':49 'page':201 'paid email endpoint' 'part':43 'path':137 'pay':2,19,54 'pay-per-call email' 'pay-per-request':1,18,53 'payment':98,109 'per':3,20,55,83,196 'per-request':195 'platform':47,86,169 'point':199 'post':161 'premium':118 'price':182,198 'prompt':212 'protocol':105 'rate':92,185 'request':4,21,56,84,162,197 'request/response':215 'requir':87 'resourc':148 'respons':152 'return':141,205 'schema':216 'sentiment':176 'settl':12,29,69 'span':58 'specif':112,146 'summar':179 'text':178 'type':154 'unavail':218 'upfront':96 'url':136 'usdc':14,31,75 'usdc-settlement' 'use':74 'valid':187 'via':10,27,102 'wallet':211 'x':108 'x-payment':107 'x402':11,28,37,104 'x402 email' 'x402-enabled':36 'x402-payment'","prices":[{"id":"5050445e-14e5-4411-993a-58a1713f57c6","listingId":"550a9070-2795-4718-a9d2-0afa75359f15","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.811Z"}],"sources":[{"listingId":"550a9070-2795-4718-a9d2-0afa75359f15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.811Z","lastSeenAt":"2026-04-22T04:02:25.557Z"}],"details":{"listingId":"550a9070-2795-4718-a9d2-0afa75359f15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/79 \\\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 requiring X-PAYMENT header, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/79"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/79"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/79"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating pay-as-you-go email data into agent workflows","Accessing premium email content without API key registration"],"bestFor":["Agents needing on-demand email data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer per-call pricing over monthly plans"],"notFor":["High-volume email processing where per-call costs add up quickly","Users who need detailed API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.251Z"},"updatedAt":"2026-04-22T04:02:25.557Z"}}