{"id":"dccea86b-5c72-48d4-9911-5443d9437fdb","shortId":"ypzhsE","kind":"x402","title":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically /api/v1/emails/61) gated behind the x402 payment protocol. The endpoint accepts POST requests and returns application/json responses. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific /api/v1/emails/61 endpoint is not listed on the site's landing page catalog, and no documentation describes what it returns or what input it expects. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without schema details or documentation for this particular endpoint, its exact functionality remains unclear — the description \"Premium API Access\" is generic and uninformative. Treat this listing as a stub until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","email-data","json-response","pay-per-request","no-api-key"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API access","Base network API","lowpaymentfee","premium email data"],"warnings":["The /api/v1/emails/61 path is not listed in the site's public API catalog — its purpose is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request or response schema is available; integration requires guessing or trial-and-error.","The generic description 'Premium API Access' provides no insight into what data is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/61","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is zero documentation for this specific emails/61 resource — no input schema, no response schema, no description of what it does. The docs pages are empty. This is effectively a 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'/request':134 '0.02':10,24,75,133 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':70 '20':78 '6':83 'Base network API' 'USDC API access' 'accept':53 'access':36,148,211 'advertis':89 'ai':101 'analysi':105 'analyt':100 'api':35,97,141,180,210 'application/json':58 'base':8,22,65,80 'behind':46 'broader':86 'catalog':92,163 'classif':107 'connect':186 'content':192 'contract':69 'convers':124 'cost':73 'data':5,19,99 'decim':84 'describ':167 'descript':208 'detail':195 'doc':177 'document':166,197,224 'email':4,18,40 'email API' 'email-data' 'email-rel':39 'embed':108 'emphas':139 'endpoint':6,20,30,52,127,153,201 'estim':118 'exact':203 'exchang':113 'expect':175 'feed':112 'financ':109 'function':204 'gas':117 'gate':3,17,45,96 'generat':125 'generic':213 'geocod':122 'howev':149 'infrastructur':120 'input':173 'instant':147 'json-response' 'key':142 'land':161 'learn':103 'limit':145 'list':129,156,218 'lowpaymentfee' 'lowpaymentfee.com':32,87 'machin':102 'network':66 'no-api-key' 'page':162,181 'paid email endpoint' 'particular':200 'pay':9,23 'pay-per-request' 'payment':49,60 'per':11,25,76 'platform':88,138 'point':136 'post':54 'premium':34,209 'premium email data' 'price':111,135,178 'prompt':188 'protocol':50 'provid':33 'quot':116 'rate':114,144 'relat':41 'remain':205 'render':183 'request':12,26,55,77 'resourc':42 'respons':59 'return':57,170 'schema':194 'sentiment':104 'settl':62 'site':159 'span':98 'specif':43,151 'stub':221 'summar':106 'surfac':225 'token':115 'treat':216 'unclear':206 'uninform':215 'unit':81 'usdc':14,28,68 'usdc-base' 'use':67 'util':121 'valid':123 'wallet':187 'web3':110 'wide':91 'without':193 'x402':2,16,48,95 'x402 email' 'x402-gated':1,15,94 'x402-payment'","prices":[{"id":"d392ff16-e8be-413c-b48a-62c5ee0e9d91","listingId":"dccea86b-5c72-48d4-9911-5443d9437fdb","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.606Z"}],"sources":[{"listingId":"dccea86b-5c72-48d4-9911-5443d9437fdb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.606Z","lastSeenAt":"2026-04-22T05:31:59.770Z"}],"details":{"listingId":"dccea86b-5c72-48d4-9911-5443d9437fdb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/61 \\\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 at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/emails/61"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/61"},{"claim":"Platform lists all APIs at $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/emails/61 endpoint is not present in the site's public API catalog","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data behind a micropayment wall","Agent-driven data access without API key provisioning","Pay-per-call email resource lookup"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases needing keyless, on-demand API access","Micropayment-gated data retrieval"],"notFor":["Users who need documented request/response schemas before integrating","High-volume batch email processing where per-call pricing adds up","Anyone needing email sending or SMTP relay services"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.51Z"},"updatedAt":"2026-04-22T05:31:59.770Z"}}