{"id":"c026d715-770a-4a71-9734-4bccda6f27d2","shortId":"u7nXHW","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/81`). 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/81` 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…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /README) all resolve to a minimal \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the `/api/v1/emails/81` resource actually returns. The email-specific nature of this endpoint is only inferable from the URL path; the platform's landing page does not list it among its advertised API categories.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","post-endpoint"],"categories":["data"],"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 all show only 'Connect wallet' with no content","The /api/v1/emails/81 endpoint is not listed among the platform's advertised APIs on the landing page","No OpenAPI schema or request/response examples exist; the actual data returned is unknown","The purpose of this specific endpoint (emails/81) is entirely unclear — it could be a test or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/emails/81 resource actually provides. The docs, pricing, and README pages are all empty stubs. This is effectively a stub 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'/api/v1/emails/81':47,91,206 '/docs':177 '/pricing':178 '/readme':179 '0.02':10,24,76,140 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':134 '20':128 '2913':135 '300':154 '6':144 'Base network API' 'USDC API' 'accept':159 'access':39,96,173 'actual':208 'address':150 'advertis':164,236 'ai/ml':66 'among':234 'analyt':65 'api':38,95,166,237 'base':8,22,85,130,137 'broader':53 'call':61 'categori':238 'challeng':100,122 'connect':185 'content':191 'crypto':69 'data':5,19,64,107 'decim':145 'detail':103 'document':104,175 'dozen':56 'email':4,18,43,212 'email API' 'email-data' 'email-rel':42 'email-specif':211 'endpoint':6,20,30,62,111,158,217 'equal':139 'exact':125 'exampl':199 'explan':202 'financ':68 'gate':3,17,37 'given':141 'howev':174 'infer':67,220 'instant':172 'key':167 'label':93 'lack':102 'land':228 'limit':170 'list':232 'live':113 'lowpaymentfee' 'lowpaymentfee.com':32 'micropayment API' 'minim':184 'natur':214 'network':86 'offer':55 'openapi':195 'page':176,229 'paid email endpoint' 'part':50 'path':224 'pay':9,23,59 'pay-per-cal':58 'pay-per-call email' 'pay-per-request' 'payment':126,146 'per':11,25,60,77 'platform':54,163,226 'post':160 'post-endpoint' 'premium':94 'price':74 'prompt':187 'protocol':36 'provid':33 'rate':169 'relat':44 'request':12,26,78,161 'request/response':198 'requir':123 'resolv':181 'resourc':45,89,207 'respond':115 'return':109,209 'schema':196 'second':155 'sent':148 'servic':72 'settl':80 'span':63 'specif':46,88,213 'substant':190 'timeout':156 'unit':131 'url':223 'usdc':14,28,82,133,142 'usdc-base' 'util':71 'valid':118 'version':120 'wallet':186 'x402':2,16,35,99,119 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':34","prices":[{"id":"f4a57fc5-2f20-4d2a-85d2-606242ce63fc","listingId":"c026d715-770a-4a71-9734-4bccda6f27d2","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.712Z"}],"sources":[{"listingId":"c026d715-770a-4a71-9734-4bccda6f27d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.712Z","lastSeenAt":"2026-04-25T14:33:15.935Z"}],"details":{"listingId":"c026d715-770a-4a71-9734-4bccda6f27d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/81 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/81"},{"claim":"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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/81"},{"claim":"Documentation pages (/docs, /pricing, /README) resolve to minimal 'Connect wallet' content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data behind a per-request paywall","Agent-driven data access without API key management","Programmatic access to premium email resources via x402 protocol"],"bestFor":["Agents or services that need keyless, pay-per-call email data access","Developers experimenting with x402 payment protocol on Base","Scenarios requiring low-cost, no-commitment API access"],"notFor":["Users who need documented request/response schemas before integrating","High-volume email processing where per-request pricing adds up","Anyone needing detailed email service features (sending, SMTP, etc.) — the endpoint's actual capability is unclear"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.378Z"},"updatedAt":"2026-04-25T14:33:15.935Z"}}