{"id":"f7c55911-2c13-4f44-a3bb-2f81827d40ee","shortId":"WpVGwP","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 `/api/v1/emails/48` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data & analytics, AI/ML, finance, and infrastructure categories. The specific resource at `/emails/48` is labeled \"Premium API Access\" and returns JSON data via HTTP POST. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme.\n\nThe platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge captured from this endpoint shows a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's stated pricing. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/48` endpoint actually returns. The endpoint path suggests email-related data (possibly a specific email record by ID), but this is purely inferential. The broader platform lists many endpoint categories but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","email-data"],"categories":["data"],"synonyms":["email API","paid email endpoint","x402 email","lowpaymentfee","USDC API","Base network API","pay-per-call email"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema describing request parameters or response format","The purpose of /api/v1/emails/48 is unclear — 'Premium API Access' is a generic label","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with consistent pricing, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint path and title ('Premium API Access' at /emails/48) give minimal clues about 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'/emails/48':62 '0.02':10,24,99,138 '000':129 '0x8335':85 '20':128 '2913':86 '300':150 '6':134 'Base network API' 'USDC API' 'access':67 'across':102 'actual':190 'advertis':96 'ai/ml':53 'analyt':52 'api':49,66,107,158 'base':8,22,80,130 'broader':213 'call':48 'captur':120 'categori':57,218 'challeng':119 'collect':40 'commit':115 'connect':167 'consist':139 'content':173 'contract':84 'data':5,19,51,71,199 'decim':135 'descript':184 'detail':222 'doc':157 'document':152,223 'email':4,18,197,203 'email API' 'email-data' 'email-rel':196 'endpoint':6,20,30,104,123,189,193,217 'equal':137 'exact':91 'exact-pay':90 'exampl':181 'extrem':154 'financ':54 'flat':98 'gate':3,17 'http':73 'http-post' 'id':206 'inferenti':211 'infrastructur':56 'json':70 'json-response' 'key':108 'label':64 'limit':111 'list':215 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':216 'maxamountrequir':126 'minimum':114 'network':81 'openapi':177 'page':162 'paid email endpoint' 'part':34 'path':194 'pay':9,23,46 'pay-per-cal':45 'pay-per-call email' 'pay-per-request' 'payment':75,92,147 'per':11,25,47,100 'platform':38,95,214 'possibl':200 'post':74 'premium':65 'price':145,159 'prompt':169 'protocol':44 'provid':220 'pure':210 'rate':110 'readm':161 'record':204 'relat':198 'render':164 'request':12,26,101 'request/response':180 'requir':116 'resourc':60 'return':69,191 'schema':178 'scheme':93 'second':151 'settl':77 'show':124 'site':142 'span':50 'spars':155 'specif':59,202 'state':144 'suggest':195 'timeout':148 'unit':131 'usdc':14,28,83,133 'usdc-base' 'use':82 'via':72 'wallet':168 'x402':2,16,43,89,118 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"fc9e2bad-0d16-4297-af24-f868972169ac","listingId":"f7c55911-2c13-4f44-a3bb-2f81827d40ee","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.230Z"}],"sources":[{"listingId":"f7c55911-2c13-4f44-a3bb-2f81827d40ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.230Z","lastSeenAt":"2026-04-25T15:33:11.299Z"}],"details":{"listingId":"f7c55911-2c13-4f44-a3bb-2f81827d40ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/48 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/emails/48"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/48"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven data access without API key provisioning","Programmatic access to premium email records via crypto micropayment"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access","Low-volume or sporadic data retrieval where subscriptions are overkill"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume batch processing where per-request pricing adds up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.075Z"},"updatedAt":"2026-04-25T15:33:11.299Z"}}