{"id":"555d792a-66b5-4d55-b900-2a8f7b6ecb24","shortId":"R2Szun","kind":"x402","title":"Pay-per-request email API endpoint on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request email API endpoint on Base via x402, settled in USDC at $0.02/call.","description":"This endpoint at `/api/v1/emails/9` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML, finance, infrastructure utilities, and more. Each request is paid for individually using the x402 protocol, settling in USDC on the Base network. The specific endpoint probed here is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe platform advertises a simple model: no API keys, no rate limits, no commitments, and instant access. Payment is handled via the x402 `X-PAYMENT` header using the \"exact\" scheme. The endpoint accepts HTTP POST requests and returns `application/json` responses. However, the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this specific emails endpoint is unknown.\n\nBecause the endpoint path includes `/emails/9`, it likely serves email-related data or functionality (e.g., retrieving or processing a specific email resource), but no documentation confirms what input it expects or what output it returns. The broader platform lists many endpoint categories but provides no detailed API documentation for any of them. Treat this as a low-documentation, exploratory endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","json-response","no-api-key"],"categories":["email","utility"],"synonyms":["email API","pay-per-call email","x402 email endpoint","USDC email API","lowpaymentfee email","micropayment email API","Base network API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet'","Request and response schemas are completely unknown","The specific function of /api/v1/emails/9 is undocumented and unclear","No examples, error codes, or usage guides provided by the platform"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages return only 'Connect wallet'. The purpose of the /emails/9 path is entirely 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'/api/v1/emails/9':38 '/call':17,34 '/docs':151 '/emails/9':183 '/pricing':153 '/readme':154 '0.02':16,33,93 '000':97 '20':96 '6':103 'Base network API' 'USDC email API' 'accept':138 'access':90,121 'actual':168 'advertis':107 'ai/ml':58 'analyt':57 'api':6,23,54,89,112,225 'application/json':144 'base':9,26,79,98 'base-network' 'broader':215 'categori':220 'collect':48 'commit':118 'confirm':204 'connect':159 'content':165 'cost':92 'crawl':148 'data':56,190 'decim':104 'detail':224 'document':149,203,226,237 'e.g':193 'email':5,22,174,188,199 'email API' 'email-api' 'email-rel':187 'endpoint':7,24,36,83,137,175,180,219,239 'exact':134 'expect':208 'exploratori':238 'financ':59 'function':192 'handl':124 'header':131 'howev':146 'http':139 'includ':182 'individu':69 'infrastructur':60 'input':206 'instant':120 'json-response' 'key':113 'label':87 'like':185 'limit':116 'list':217 'low':236 'low-document':235 'lowpaymentfee email' 'lowpaymentfee.com':43 'mani':218 'micropayment email API' 'model':110 'network':80 'no-api-key' 'offer':46 'output':211 'page':150 'paid':67 'part':40 'path':181 'pay':2,19,51 'pay-per-call email' 'pay-per-request':1,18,50 'payment':122,130 'per':3,20,52,94 'platform':44,106,216 'post':140 'premium':88 'probe':84 'process':196 'prompt':161 'protocol':73 'provid':222 'rate':115 'relat':189 'request':4,21,53,65,95,141 'request/response':169 'resourc':200 'respons':145 'retriev':194 'return':143,156,213 'schema':170 'scheme':135 'serv':186 'settl':12,29,74 'simpl':109 'span':55 'specif':82,173,198 'substant':164 'treat':231 'unit':99 'unknown':177 'usdc':14,31,76,101 'usdc-settlement' 'use':70,132 'util':61 'via':10,27,125 'wallet':160 'x':129 'x-payment':128 'x402':11,28,72,127 'x402 email endpoint' 'x402-payment'","prices":[{"id":"cddd4905-8cee-4d5b-af9c-48f04a3b8a4e","listingId":"555d792a-66b5-4d55-b900-2a8f7b6ecb24","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.955Z"}],"sources":[{"listingId":"555d792a-66b5-4d55-b900-2a8f7b6ecb24","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.955Z","lastSeenAt":"2026-04-22T02:31:51.289Z"}],"details":{"listingId":"555d792a-66b5-4d55-b900-2a8f7b6ecb24","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/9 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/9"},{"claim":"Platform 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/9"}],"useCases":["Retrieving or processing email data on a per-request payment basis","Integrating email functionality into agent workflows without API key management","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use email API access","Low-volume or sporadic email API usage without subscriptions"],"notFor":["High-volume email sending requiring bulk pricing","Users needing detailed API documentation before integration","Production systems requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.999Z"},"updatedAt":"2026-04-22T02:31:51.289Z"}}