{"id":"81de0454-cb90-4092-8361-119c04d89575","shortId":"UQWebL","kind":"x402","title":"Pay-per-call email API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/emails/44` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/api/v1/emails/44` is listed under \"Premium API Access\" but its exact functionality is not well-documented — the path suggests an email-related resource (possibly email lookup, validation, or retrieval for record ID 44), though the site's landing page does not explicitly list email endpoints among its categories.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is handled via the x402 `exact` scheme: callers attach an `X-PAYMENT` header with a signed payment to the specified `payTo` address. There are no API keys, no rate limits, and no subscription commitments — each call is independently settled on-chain. 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 additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","no-api-key","json-response"],"categories":["email","data"],"synonyms":["email lookup API","email endpoint","pay-per-call API","x402 email","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The endpoint path '/api/v1/emails/44' is not listed among the site's advertised API categories, making its purpose unclear","No request body schema or response schema is available; callers cannot determine what to send","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/44","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/44","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. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The exact purpose of '/api/v1/emails/44' is unclear — it is not listed on the site's landing page among the advertised API categories. This is effectively a stub 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'/api/v1/emails/44':38,83 '/docs':204 '/pricing':205 '/readme':208 '/request':17,34 '0.02':16,33,134,146 '000':138 '20':137 '402':246 '44':116 '6':144 'Base network API' 'USDC micropayment API' 'accept':193 'access':89 'addit':219 'address':170 'ai/ml':58 'among':129 'analyt':57 'api':6,23,54,88,174 'application/json':198 'attach':156 'avail':233 'base':9,26,77,139 'base-network' 'bodi':258 'call':4,21,184 'caller':155 'categori':131 'chain':190 'challeng':247 'collect':48 'commit':182 'confirm':241 'connect':214 'content':220 'crawl':236 'crypto':61 'data':56 'decim':145 'difficult':253 'document':98,199,250 'email':5,22,104,108,127 'email endpoint' 'email lookup API' 'email-api' 'email-rel':103 'endpoint':7,24,36,66,128,192,239 'exact':92,153 'exampl':232 'expect':265 'explicit':125 'extrem':201 'financ':60 'function':93 'handl':149 'header':161 'id':115 'independ':186 'infer':59 'json-response' 'key':175 'know':255 'land':121 'limit':178 'list':85,126 'live':242 'lookup':109 'lowpaymentfee' 'lowpaymentfee.com':43 'materi':237 'network':78 'no-api-key' 'offer':46 'on-chain':188 'openapi':224 'page':122,209 'part':40 'path':100 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':70,147,160,165 'payto':169 'per':3,20,52,135 'platform':44 'possibl':107 'post':194 'premium':87 'price':132 'prompt':216 'proper':245 'protocol':71 'rate':177 'record':114 'relat':105 'render':211 'request':53,136,195,257 'request/response':227 'resourc':81,106 'respons':263 'retriev':112 'return':197,243 'schema':228 'scheme':154 'send':260 'servic':64 'settl':12,29,72,187 'sign':164 'site':119 'span':55 'spars':202 'spec':225 'specif':80 'specifi':168 'subscript':181 'suggest':101 'though':117 'unit':140 'usag':231 'usdc':14,31,74,142 'usdc-settlement' 'use':67 'util':63 'valid':110 'via':10,27,150 'wallet':215 'well':97 'well-docu':96 'without':249 'x':159 'x-payment':158 'x402':11,28,69,152 'x402 email' 'x402-payment'","prices":[{"id":"61305a2e-f8a3-46d9-95b4-c63c31a59f9c","listingId":"81de0454-cb90-4092-8361-119c04d89575","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.256Z"}],"sources":[{"listingId":"81de0454-cb90-4092-8361-119c04d89575","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.256Z","lastSeenAt":"2026-04-22T09:02:00.943Z"}],"details":{"listingId":"81de0454-cb90-4092-8361-119c04d89575","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/44 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/44"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/44"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or validating email data on a per-request payment basis","Agent-driven email lookups without requiring API key registration","Programmatic access to email resources with on-chain USDC settlement"],"bestFor":["Developers wanting zero-signup, pay-as-you-go email API access","AI agents that can settle x402 payments autonomously on Base","Use cases requiring no rate limits or subscription commitments"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume email operations where per-request on-chain settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.198Z"},"updatedAt":"2026-04-22T09:02:00.943Z"}}