{"id":"7794f673-d122-4675-abba-efb999364722","shortId":"Lzahtw","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 x402-protocol-gated API access to an email-related resource (specifically `/api/v1/emails/41`). It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific resource at `/api/v1/emails/41` is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what data it returns. The endpoint is live and responds with a valid x402 version-1 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The method is POST and the response MIME type is application/json.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /README) all render only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown. The endpoint's purpose (emails) is not listed on the homepage's catalog of available APIs, making it unclear whether this is a production resource or a test/demo endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","post-method"],"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 — /docs, /pricing, and /README pages render only a wallet-connect prompt with no content.","The /api/v1/emails/41 path is not listed among the site's advertised API catalog, raising questions about whether it is a production endpoint.","No request body schema or response schema is documented; callers cannot know what to send or what to expect.","Purpose of 'emails/41' is entirely unclear — could be a demo, test, or unlisted resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/41","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/41","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, but there is no documentation, no request/response schema, and the emails endpoint is not listed on the site's own catalog. The docs, pricing, and README pages are all empty. It is impossible to determine what this endpoint actually returns without 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'/api/v1/emails/41':47,91 '/docs':182 '/pricing':183 '/readme':184 '0.02':10,24,76,139 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':134 '20':128 '300':153 '6':143 'Base network API' 'USDC API' 'access':39,96,178 'actual':198 'address':149 'advertis':169 'ai/ml':66 'analyt':65 'api':38,95,171,221 'application/json':166 'avail':220 'base':8,22,85,130,136 'base-network' 'broader':53 'call':61 'catalog':218 'challeng':100,122 'connect':189 'content':195 'crypto':69 'data':5,19,64,107 'decim':144 'detail':103 'document':104,180 'dozen':56 'email':4,18,43,210 'email API' 'email-data' 'email-rel':42 'endpoint':6,20,30,62,111,203,207,234 'equal':138 'exact':125 'financ':68 'gate':3,17,37 'given':140 'homepag':216 'howev':179 'infer':67 'instant':177 'json-response' 'key':172 'label':93 'lack':102 'limit':175 'list':213 'live':113 'lowpaymentfee' 'lowpaymentfee.com':32 'make':222 'method':157 'micropayment API' 'mime':163 'network':86 'offer':55 'page':181 'paid email endpoint' 'part':50 'pay':9,23,59 'pay-per-cal':58 'pay-per-call email' 'pay-per-request' 'payment':126,145 'per':11,25,60,77 'platform':54,168 'post':159 'post-method' 'premium':94 'price':74 'product':229 'prompt':191 'protocol':36 'provid':33 'purpos':209 'rate':174 'relat':44 'render':186 'request':12,26,78 'request/response':199 'requir':123 'resourc':45,89,230 'respond':115 'respons':162 'return':109 'schema':200 'second':154 'sent':147 'servic':72 'settl':80 'span':63 'specif':46,88 'substant':194 'test/demo':233 'timeout':155 'type':164 'unclear':224 'unit':131 'unknown':205 'usdc':14,28,82,133,141 'usdc-settlement' 'util':71 'valid':118 'version':120 'wallet':190 'whether':225 'x402':2,16,35,99,119 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':34","prices":[{"id":"e66bf551-6631-4a5a-85be-9870caf680bf","listingId":"7794f673-d122-4675-abba-efb999364722","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.184Z"}],"sources":[{"listingId":"7794f673-d122-4675-abba-efb999364722","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.184Z","lastSeenAt":"2026-04-22T09:02:01.012Z"}],"details":{"listingId":"7794f673-d122-4675-abba-efb999364722","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/41 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/41"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/41"},{"claim":"Documentation pages (/docs, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data behind a micropayment wall","Demonstrating x402 payment protocol integration on Base","Agent-driven data retrieval with per-call USDC settlement"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases needing keyless, pay-per-call API access"],"notFor":["Production email workflows requiring documented schemas and SLAs","Users who need free or subscription-based email APIs","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.123Z"},"updatedAt":"2026-04-22T09:02:01.012Z"}}