{"id":"f4ae2f7e-4724-4c2c-96f5-91080349ac27","shortId":"gUyCge","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 x402-enabled endpoint at `/api/v1/emails/65` 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. Each call is settled on the Base network using USDC (contract 0x8335…2913) with no API keys, no rate limits, and no subscriptions required — just an x402 payment header per request.\n\nThe specific endpoint probed (`/api/v1/emails/65`) is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The response MIME type is `application/json`. However, the crawled documentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/emails/65` endpoint actually returns or what input it expects.\n\nBecause the endpoint path suggests email-related data (possibly an email record lookup or email validation service) but no documentation confirms this, the actual functionality remains unclear. The platform's landing page lists many API categories but does not include an explicit emails category, making this endpoint's purpose ambiguous. Agents should treat this as a live, payable endpoint but should be aware that the lack of documentation means the request format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","email-data"],"categories":["data","email"],"synonyms":["email API","email lookup","pay-per-call API","x402 email endpoint","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are completely unknown.","The /emails/65 endpoint is not listed among the platform's advertised API categories, making its purpose ambiguous.","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content.","Endpoint functionality is inferred solely from the URL path; actual behavior is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/65","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/65","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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual purpose of the /emails/65 endpoint is undocumented. Functionality must be guessed from the URL path 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'/emails/65':177 '/request':17,34 '0.02':16,33,129 '000':120 '0x8335':77 '20':119 '2913':78 '6':125 'Base network API' 'USDC micropayment API' 'accept':108 'access':106 'actual':179,210 'advertis':114 'agent':237 'ai/ml':61 'ambigu':236 'analyt':60 'api':57,81,105,148,221 'application/json':137 'awar':249 'base':9,26,72,121 'base-network' 'call':4,21,67 'categori':222,230 'challeng':113 'collect':51 'confirm':207 'connect':156 'contract':76 'cost':117 'crawl':140 'data':6,23,59,194 'decim':126 'descript':173 'detail':162 'doc':146 'document':141,206,254 'email':5,22,192,197,201,229 'email API' 'email lookup' 'email-data' 'email-rel':191 'enabl':38 'endpoint':7,24,39,99,178,188,233,245 'equal':128 'expect':185 'explicit':228 'extrem':143 'financ':62 'format':258 'function':211 'header':94 'howev':138 'includ':226 'infrastructur':63 'input':183 'json-response' 'key':82 'label':103 'lack':252 'land':217 'limit':85 'list':219 'live':243 'lookup':199 'lowpaymentfee' 'lowpaymentfee.com':46 'make':231 'mani':220 'maximum':116 'mean':255 'mime':134 'network':73 'no-api-key' 'offer':49 'openapi':166 'page':151,218 'part':43 'path':189 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'payabl':244 'payment':93 'per':3,20,55,95,130 'platform':47,215 'possibl':195 'post':109 'premium':104 'price':147 'probe':100 'prompt':158 'purpos':235 'rate':84 'readm':150 'record':198 'relat':193 'remain':212 'render':153 'request':56,96,110,131,257 'request/response':169 'requir':89 'respons':133,260 'return':180 'schema':170 'servic':203 'settl':12,29,69 'span':58 'spec':167 'specif':98 'structur':261 'subscript':88 'suggest':190 'thin':144 'treat':239 'type':135 'unclear':213 'unit':122 'unknown':263 'usdc':14,31,75,124 'usdc-settlement' 'use':74 'valid':202 'via':10,27 'wallet':157 'x402':11,28,37,92,112 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"4f2f33cc-1fa6-429b-8372-1f22c4f6a3ee","listingId":"f4ae2f7e-4724-4c2c-96f5-91080349ac27","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.538Z"}],"sources":[{"listingId":"f4ae2f7e-4724-4c2c-96f5-91080349ac27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.538Z","lastSeenAt":"2026-04-22T05:31:59.699Z"}],"details":{"listingId":"f4ae2f7e-4724-4c2c-96f5-91080349ac27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/65 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/65"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/65"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven API consumption without pre-registration or API keys","Micropayment-gated data access settled on Base L2"],"bestFor":["Agents needing keyless, pay-as-you-go API access","Developers experimenting with x402 payment protocol","Use cases requiring low-friction, no-subscription data endpoints"],"notFor":["Production workloads requiring well-documented request/response schemas","High-volume batch processing where per-call pricing is inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.559Z"},"updatedAt":"2026-04-22T05:31:59.699Z"}}