{"id":"cf0671a0-c4a8-45cb-87fb-facf47a0cc18","shortId":"Xf37Nd","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 access to an email-related resource at `/api/v1/emails/74`. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific resource `/api/v1/emails/74` is not listed on the provider's public landing page among the advertised API categories, so its exact functionality is unclear. The x402 challenge confirms the endpoint is live and accepts POST requests, charging up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed description of what this particular emails endpoint returns. The input schema indicates it is an HTTP POST endpoint marked as discoverable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","http-post"],"categories":["data"],"synonyms":["email API","email lookup","premium email endpoint","x402 email","lowpaymentfee email","paid email API","Base USDC API"],"warnings":["The /api/v1/emails/74 path is not listed among the provider's publicly advertised endpoints — its purpose is unclear.","All documentation pages (/docs, /pricing, /README) returned no content beyond a wallet-connect prompt.","No request body schema or response schema is available; callers cannot know what to send or expect back.","No OpenAPI spec or AI plugin manifest was found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/74","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific /api/v1/emails/74 endpoint is not documented on the provider's site, no request/response schema is available, and all documentation pages are empty. The endpoint's actual functionality is 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'/docs':169 '/pricing':170 '/readme':171 '0.02':10,24,73,136 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':130 '20':124 '2913':131 '300':152 '6':134 'Base USDC API' 'accept':118 'access':37,166 'across':62 'address':148 'advertis':100,157 'ai/ml':65 'among':98 'analyt':64 'api':60,101,159 'base':8,22,82,126,133 'broader':51 'call':59,138 'categori':69,102 'challeng':111 'charg':121 'confirm':112 'connect':175 'content':181 'data':5,19,63 'decim':135 'descript':192 'detail':191 'discover':212 'document':167,187 'dozen':54 'email':4,18,41,197 'email API' 'email lookup' 'email-data' 'email-rel':40 'endpoint':6,20,30,61,114,198,209 'exact':105,145 'exampl':189 'finance/web3':66 'function':106 'gate':3,17 'http':207 'http-post' 'indic':203 'infrastructur':68 'input':201 'instant':165 'key':160 'land':96 'limit':163 'list':90 'live':116 'lowpaymentfee email' 'lowpaymentfee.com':32 'made':141 'mark':210 'network':83 'offer':53 'page':97,168 'paid email API' 'part':48 'particular':196 'pay':9,23,57 'pay-per-cal':56 'pay-per-request' 'payment':139 'per':11,25,58,74,137 'platform':52,156 'post':119,208 'premium email endpoint' 'price':71 'prompt':177 'protocol':36 'provid':33,93 'public':95 'rate':162 'relat':42 'request':12,26,75,120 'request/response':188 'resourc':43,86 'return':172,199 'schema':186,202 'scheme':146 'second':153 'settl':77 'specif':85 'substant':180 'timeout':154 'unclear':108 'unit':127 'usdc':14,28,79,129 'usdc-base' 'via':142 'wallet':176 'x402':2,16,35,110,144 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"53f65222-6108-41fd-853d-51ad7ccdda19","listingId":"cf0671a0-c4a8-45cb-87fb-facf47a0cc18","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.821Z"}],"sources":[{"listingId":"cf0671a0-c4a8-45cb-87fb-facf47a0cc18","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.821Z","lastSeenAt":"2026-04-25T14:03:56.037Z"}],"details":{"listingId":"cf0671a0-c4a8-45cb-87fb-facf47a0cc18","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/74 \\\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":"The 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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/emails/74"},{"claim":"The endpoint accepts POST requests and is marked discoverable in the outputSchema.","source_url":"https://lowpaymentfee.com/api/v1/emails/74"}],"useCases":["Retrieving email-related data behind a micropayment wall","Agent-driven data access without API keys or subscriptions","Programmatic pay-per-call email resource lookup"],"bestFor":["Agents needing keyless, pay-per-use API access on Base","Developers experimenting with x402 protocol payments","Low-cost single-request data retrieval"],"notFor":["Bulk email sending or marketing automation","Users who need detailed API documentation before integrating","Production workflows requiring guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.141Z"},"updatedAt":"2026-04-25T14:03:56.037Z"}}