{"id":"c05464f3-03ef-44de-8173-d2b4e6753512","shortId":"KLfDWb","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 x402-enabled endpoint at `/api/v1/emails/31` 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 with no API keys, no rate limits, and no subscriptions — just a per-request micropayment of $0.02.\n\nThe specific endpoint probed (`/api/v1/emails/31`) is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (i.e., $0.02) per call on Base mainnet, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`. However, the exact functionality of this particular email endpoint is not documented in the crawled material — the site's landing page lists categories like analytics, AI, finance, and utilities but does not mention an emails API. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint.\n\nBecause the endpoint's actual behavior (what it returns for a given email ID, what input it expects) is undocumented in the available material, agents should treat this as a partially-described resource. The platform's broader value proposition — low-cost, keyless, instant-access APIs settled via x402 on Base — is clear, but the specifics of this email endpoint remain opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key"],"categories":["data","email"],"synonyms":["email API","email lookup","premium email endpoint","x402 email","micropayment API","lowpaymentfee","pay-per-call email","USDC API"],"warnings":["No documentation found for the /api/v1/emails/31 endpoint — its purpose and expected input/output are unknown","The site's landing page does not list any email-related APIs, so this endpoint may be unlisted or experimental","No OpenAPI spec, request schema, or response examples are available","Docs, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/emails/31 endpoint is not explained anywhere in the crawled material. This is effectively a stub 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'/call':17,34 '0.02':16,33,93,126 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '20':119 'USDC API' 'accept':105 'access':103,237 'actual':195 'address':134 'agent':215 'ai':167 'ai/ml':61 'analyt':60,166 'api':57,78,102,177,238 'application/json':141 'avail':213 'base':9,26,72,121,130,243 'base-network' 'behavior':196 'broader':228 'call':67,128 'categori':164 'challeng':110 'clear':245 'collect':51 'confirm':111 'cost':233 'crawl':156 'data':6,23,59 'describ':223 'detail':184 'document':153,185 'email':5,22,149,176,203,251 'email API' 'email lookup' 'email-data' 'enabl':38 'endpoint':7,24,39,96,150,190,193,252 'exact':144 'exampl':182 'expect':208 'financ':62,168 'found':187 'function':145 'given':202 'howev':142 'i.e':125 'id':204 'infrastructur':63 'input':206 'instant':236 'instant-access':235 'json-response' 'key':79 'keyless':234 'label':100 'land':161 'like':165 'limit':82 'list':163 'live':114 'low':232 'low-cost':231 'lowpaymentfee' 'lowpaymentfee.com':46 'mainnet':131 'materi':157,214 'maximum':117 'mention':174 'micropay':91 'micropayment API' 'mime':138 'network':73 'no-api-key' 'offer':49 'opaqu':254 'openapi':179 'page':162 'paid':132 'part':43 'partial':222 'partially-describ':221 'particular':148 'pay':2,19,54 'pay-per-call email' 'pay-per-request':1,18,53 'per':3,20,55,89,127 'per-request':88 'platform':47,226 'post':106 'premium':101 'premium email endpoint' 'probe':97 'proposit':230 'rate':81 'remain':253 'request':4,21,56,90,107,115 'request/response':181 'resourc':224 'respons':137 'return':199 'schema':180 'settl':12,29,69,239 'site':159 'span':58 'specif':95,248 'subscript':85 'treat':217 'type':139 'undocu':210 'unit':122 'usdc':14,31,75,124 'usdc-settlement' 'use':74 'util':170 'valu':229 'via':10,27,240 'x402':11,28,37,109,241 'x402 email' 'x402-enabled':36 'x402-payment'","prices":[{"id":"f8b0f37b-de81-4c7c-a644-45821071e2bf","listingId":"c05464f3-03ef-44de-8173-d2b4e6753512","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.876Z"}],"sources":[{"listingId":"c05464f3-03ef-44de-8173-d2b4e6753512","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.876Z","lastSeenAt":"2026-04-22T11:32:42.779Z"}],"details":{"listingId":"c05464f3-03ef-44de-8173-d2b4e6753512","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/31 \\\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 endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/31"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/31"}],"useCases":["Retrieving email-related data on a per-request payment basis without API keys","Integrating low-cost email data lookups into agent workflows via x402","Programmatic access to email records settled in USDC on Base"],"bestFor":["Agents needing keyless, pay-per-use email data access","Developers prototyping with x402 micropayments on Base","Workflows requiring no subscription or rate-limit constraints"],"notFor":["Use cases requiring documented request/response schemas before integration","High-volume email operations where per-call pricing is inefficient","Users who need non-crypto payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.667Z"},"updatedAt":"2026-04-22T11:32:42.779Z"}}