{"id":"61fb9073-6fa3-4eb1-a93b-a0381ee2d13c","shortId":"7HpqWh","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/emails/82` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML, finance, and infrastructure categories. The specific resource at `/emails/82` is labeled \"Premium API Access\" and accepts POST requests, returning JSON. Payment is settled on the Base network using USDC (contract `0x8335...2913`) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments. The x402 challenge was successfully captured, confirming the endpoint is live and responding with a valid 402 payment challenge (x402 version 1). However, the specific functionality behind `/api/v1/emails/82` is not documented — the endpoint path suggests email-related data retrieval or lookup, but no schema, example request body, or response format is provided in any crawled page.\n\nDocumentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing the expected POST body or the structure of the response, callers will need to experiment or contact the provider for integration details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key"],"categories":["data","email"],"synonyms":["email lookup API","email data endpoint","x402 email","pay-per-call email","lowpaymentfee email","USDC email API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content","The specific purpose and request/response schema of /api/v1/emails/82 is unknown; the path suggests email data but nothing is confirmed","The endpoint path '/emails/82' with a numeric ID is unusual and may represent a single fixed resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/82","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/v1/emails/82 actually does, what request body it expects, or what it returns. All doc pages are empty stubs showing only 'Connect 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'/api/v1/emails/82':38,159 '/docs':191 '/emails/82':70 '/pricing':193 '/readme':194 '/request':17,34,116 '0.02':16,33,99,115 '000':103 '0x8335':92 '1':153 '20':102 '2913':93 '402':148 '6':107 'Base network API' 'USDC email API' 'accept':77 'access':75 'across':118 'advertis':113 'ai/ml':61 'analyt':60 'api':57,74,123 'base':9,26,87,104 'base-network' 'behind':158 'bodi':179,211 'broader':110 'call':4,21 'caller':218 'captur':137 'categori':65 'challeng':134,150 'collect':48 'commit':131 'confirm':138 'connect':199 'contact':224 'content':205 'contract':91 'cost':97 'crawl':187 'data':6,23,59,170 'decim':108 'detail':229 'document':162,189 'email':5,22,168 'email data endpoint' 'email lookup API' 'email-data' 'email-rel':167 'endpoint':7,24,36,120,140,164 'exampl':177 'expect':209 'experi':222 'financ':62 'format':182 'function':157 'howev':154 'infrastructur':64 'integr':228 'json':81 'json-response' 'key':124 'know':207 'label':72 'limit':127 'live':142 'lookup':173 'lowpaymentfee email' 'lowpaymentfee.com':43,111 'maximum':96 'minimum':130 'need':220 'network':88 'no-api-key' 'offer':46 'page':188,190 'part':40 'path':165 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':53 'payment':82,149 'per':3,20,55,100 'platform':44,112 'post':78,210 'premium':73 'price':117 'prompt':201 'protocol':52 'provid':184,226 'rate':126 'relat':169 'request':56,79,101,178 'resourc':68 'respond':144 'respons':181,217 'retriev':171 'return':80,196 'schema':176 'settl':12,29,84 'span':58 'specif':67,156 'structur':214 'substant':204 'success':136 'suggest':166 'uniform':114 'unit':105 'usdc':14,31,90 'usdc-settlement' 'use':89 'valid':147 'version':152 'via':10,27 'wallet':200 'without':206 'x402':11,28,51,133,151 'x402 email' 'x402-payment' 'x402-protocol':50","prices":[{"id":"06484b29-8c23-477c-9029-0fc33c2e83e6","listingId":"61fb9073-6fa3-4eb1-a93b-a0381ee2d13c","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.519Z"}],"sources":[{"listingId":"61fb9073-6fa3-4eb1-a93b-a0381ee2d13c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.519Z","lastSeenAt":"2026-04-22T05:31:59.672Z"}],"details":{"listingId":"61fb9073-6fa3-4eb1-a93b-a0381ee2d13c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/82 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/82"},{"claim":"Platform-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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/82"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating email lookups into agent workflows without API key management","Paying for individual email data queries using USDC on Base"],"bestFor":["Agents needing keyless, pay-per-call email data access","Developers who want crypto-native micropayment APIs","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Bulk email operations requiring documented batch endpoints","Users who need detailed API documentation and response schemas before integrating","Non-crypto users without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.629Z"},"updatedAt":"2026-04-22T05:31:59.672Z"}}