{"id":"d42d715a-76ed-49c7-b427-04301704620f","shortId":"HbQ6gN","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 endpoint at `/api/v1/emails/39` 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. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/emails/39` is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what data it returns — the `/emails/` path suggests it serves email-related data, but no schema or example response is documented.\n\nPricing is straightforward: the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. This matches the site-wide pricing of $0.02/request shown on the landing page. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but without knowing the expected POST body or response format, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key"],"categories":["data"],"synonyms":["email API","premium email data","x402 email endpoint","pay-per-call email","lowpaymentfee email","USDC email API","Base network API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The specific purpose of /api/v1/emails/39 is undocumented; 'Premium API Access' is generic","The /emails/ path is not listed among the advertised API categories on the landing page, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/39","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/39","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 clear pricing, but there is no documentation, no request/response schema, no examples, and the purpose of the /emails/39 resource is unclear. Docs pages are empty beyond a wallet connect 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'/call':17,34 '/emails':101 '/emails/39':81 '/request':150 '0.02':16,33,138,149 '000':129 '20':128 '402':225 '6':134 'Base network API' 'USDC email API' 'accept':177 'access':86 'advertis':124 'ai/ml':58 'analyt':57 'api':54,85,166,190 'application/json':182 'base':9,26,75,130 'base-network' 'bodi':233 'challeng':90,123,226 'collect':48 'confirm':220 'connect':198 'contact':241 'content':204 'data':6,23,56,97,109 'decim':135 'detail':93 'doc':188 'document':94,117,183 'email':5,22,107 'email API' 'email-data' 'email-rel':106 'endpoint':7,24,36,64,176,218 'equal':137 'exact':162 'exampl':114,216 'expect':231 'experiment':239 'extrem':185 'financ':59 'format':236 'infrastructur':60 'integr':237 'json-response' 'key':167 'know':229 'label':83 'lack':92 'land':154 'limit':170 'live':221 'lowpaymentfee email' 'lowpaymentfee.com':43 'made':158 'match':142 'maxamountrequir':126 'network':76 'no-api-key' 'offer':46 'openapi':208 'page':155,193 'part':40 'path':102 'pay':2,19,51 'pay-per-call email' 'pay-per-request':1,18,50 'payment':68,156 'per':3,20,52,139 'platform':44 'post':178,232 'premium':84 'premium email data' 'price':118,147,189 'prompt':200 'proper':224 'protocol':69 'provid':243 'rate':169 'readm':192 'relat':108 'render':195 'request':4,21,53,140,179 'request/response':211 'requir':174,238 'resourc':79 'respons':115,235 'return':99,181,222 'schema':112,212 'scheme':163 'serv':105 'settl':12,29,70 'shown':151 'site':145 'site-wid':144 'span':55 'spars':186 'spec':209 'specif':78 'straightforward':120 'subscript':173 'substant':203 'suggest':103 'unit':131 'usag':215 'usdc':14,31,72,133 'usdc-settlement' 'use':65 'via':10,27,159 'wallet':199 'wide':146 'without':228 'x402':11,28,67,89,122,161 'x402 email endpoint' 'x402-payment'","prices":[{"id":"51d78a7d-9d1d-40d4-91a2-daf6c5a99398","listingId":"d42d715a-76ed-49c7-b427-04301704620f","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.269Z"}],"sources":[{"listingId":"d42d715a-76ed-49c7-b427-04301704620f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.269Z","lastSeenAt":"2026-04-25T16:04:18.491Z"}],"details":{"listingId":"d42d715a-76ed-49c7-b427-04301704620f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/39 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/39"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/39"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis without subscriptions","Agent-driven workflows that need email data and can pay per call via x402","Integrating email lookups into crypto-native applications on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go email data access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost per-request API access without API key management"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.889Z"},"updatedAt":"2026-04-25T16:04:18.491Z"}}