{"id":"aa7feb5e-24bc-4fe6-ad7f-2079f329d327","shortId":"ZuuHBT","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/76` 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`) with no API keys, no rate limits, and no subscriptions required. The x402 challenge advertises a max amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe specific endpoint `/api/v1/emails/76` is listed under \"Premium API Access\" but its exact functionality is not well-documented. Based on the URL pattern it likely returns email-related data for a specific resource (ID 76). The endpoint accepts HTTP POST requests and returns `application/json`. The payment timeout is 300 seconds, and the x402 version is 1 using the \"exact\" payment scheme.\n\nThe broader lowpaymentfee.com platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02/request price point. Documentation beyond the landing page is sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-data","pay-per-request","no-api-key","json-response","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 documentation available for the /api/v1/emails/76 endpoint — exact functionality is unknown","All doc pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No request or response schema provided; input/output format must be guessed","The endpoint path suggests a single fixed resource (ID 76) rather than a parameterized query"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/76","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/76","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 documentation for the specific /api/v1/emails/76 endpoint — no request schema, no response schema, no examples. The docs/pricing/README pages are all empty beyond a wallet connect prompt. The endpoint's actual functionality is 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'/call':17,34 '/request':201 '0.02':16,33,108,200 '000':98 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':77 '1':168 '20':97 '300':161 '6':103 '76':147 'Base network API' 'USDC API' 'accept':150 'access':120 'addit':179 'advertis':92,178 'ai/ml':61 'amount':95 'analysi':183 'analyt':60 'api':57,80,119,213 'application/json':156 'base':9,26,72,99,130 'base-network' 'beyond':205 'broader':175 'call':67 'challeng':91 'classif':186 'collect':51 'connect':222 'content':228 'contract':76 'data':6,23,59,141 'decim':104 'doc':212 'document':129,204 'email':5,22,139 'email API' 'email-data' 'email-rel':138 'embed':187 'enabl':38 'endpoint':7,24,39,113,149,180 'equal':107 'exact':123,171 'exchang':190 'feed':189 'financ':62 'function':124 'geocod':192 'http':151 'http-post' 'id':146 'infrastructur':63 'json-response' 'key':81 'land':207 'like':136 'limit':84 'list':116 'lowpaymentfee' 'lowpaymentfee.com':46,176 'max':94 'micropayment API' 'network':73 'no-api-key' 'offer':49 'page':208,217 'paid email endpoint' 'part':43 'pattern':134 'pay':2,19,54 'pay-per-call email' 'pay-per-request':1,18,53 'payment':158,172 'per':3,20,55,109 'platform':47,177 'point':203 'post':152 'premium':118 'price':188,202,214 'prompt':224 'rate':83,191 'readm':216 'relat':140 'render':219 'request':4,21,56,110,153 'requir':88 'resourc':145 'return':137,155 'scheme':173 'second':162 'sentiment':182 'settl':12,29,69 'span':58 'spars':210 'specif':112,144 'subscript':87 'substant':227 'summar':185 'text':184 'timeout':159 'unit':100 'url':133 'usdc':14,31,75,106 'usdc-settlement' 'use':74,169 'valid':193 'version':166 'via':10,27 'wallet':223 'well':128 'well-docu':127 'x402':11,28,37,90,165 'x402 email' 'x402-enabled':36 'x402-payment'","prices":[{"id":"632d0b04-a6a2-46ec-bbfa-5432485431a6","listingId":"aa7feb5e-24bc-4fe6-ad7f-2079f329d327","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.868Z"}],"sources":[{"listingId":"aa7feb5e-24bc-4fe6-ad7f-2079f329d327","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.868Z","lastSeenAt":"2026-04-22T04:02:25.611Z"}],"details":{"listingId":"aa7feb5e-24bc-4fe6-ad7f-2079f329d327","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/76"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/76"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating pay-as-you-go email data into agent workflows","Accessing premium email information without API key registration"],"bestFor":["Agents needing on-demand email data with no subscription commitment","Developers experimenting with x402 payment protocol integrations","Low-volume or sporadic email data lookups at $0.02 per call"],"notFor":["High-volume email data needs where per-request pricing becomes expensive","Users who need detailed API documentation and schema definitions before integrating","Use cases requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.131Z"},"updatedAt":"2026-04-22T04:02:25.611Z"}}