{"id":"c7c26ea5-9c29-448e-baa3-70f42335b572","shortId":"bDtRdQ","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/24` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol APIs spanning data analytics, AI/ML, finance, infrastructure, and more. Each endpoint is pay-per-request with no API keys, no rate limits, and no commitments required. Payment is settled on the Base network using USDC.\n\nThe specific endpoint probed (`/api/v1/emails/24`) is listed under \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (i.e., $0.02) per call, paid to address `0x1A2B...85F3` on Base. The asset is the canonical Base USDC contract (`0x8335...2913`). The endpoint returns `application/json`.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/24` endpoint actually does or what input it expects. The \"emails\" path segment and the numeric ID `24` suggest it may return or operate on a specific email resource, but this is purely speculative. Prospective users should test the endpoint directly or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","json-response","no-api-key"],"categories":["email","data"],"synonyms":["email API","pay-per-call email","x402 email endpoint","USDC email API","Base network API","lowpaymentfee email","micropayment email"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/emails/24.","The purpose of the 'emails/24' endpoint is unknown — the path suggests email data but no details are provided.","The broader lowpaymentfee.com platform lists many endpoint categories but this specific endpoint is not listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing and network details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the emails/24 endpoint actually does. The listing is effectively a 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'/request':17,34 '0.02':16,33,122 '000':116 '0x1a2b':128 '0x8335':140 '20':115 '24':199 '2913':141 '85f3':129 'Base network API' 'USDC email API' 'accept':101 'access':99 'actual':184 'address':127 'ai/ml':57 'analyt':56 'api':6,23,53,71,98,153 'application/json':145 'asset':133 'base':9,26,85,117,131,137 'base-network' 'call':4,21,124 'canon':136 'challeng':106 'collect':48 'commit':78 'confirm':107 'connect':161 'contact':224 'content':167 'contract':139 'data':55 'descript':178 'detail':228 'direct':222 'doc':151 'document':146 'email':5,22,192,209 'email API' 'email-api' 'endpoint':7,24,36,63,91,143,183,221 'exampl':175 'expect':190 'extrem':148 'financ':58 'i.e':121 'id':198 'infrastructur':59 'input':188 'json-response' 'key':72 'limit':75 'list':95 'live':110 'lowpaymentfee email' 'lowpaymentfee.com':43 'maximum':113 'may':202 'micropayment email' 'network':86 'no-api-key' 'numer':197 'offer':46 'openapi':171 'oper':205 'page':156 'paid':125 'part':40 'path':193 'pay':2,19,66 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':65 'payment':80 'per':3,20,67,123 'platform':44 'post':102 'premium':97 'price':152 'probe':92 'prompt':163 'prospect':216 'protocol':52 'provid':226 'pure':214 'rate':74 'readm':155 'render':158 'request':68,103 'request/response':174 'requir':79,111 'resourc':210 'return':144,203 'schema':172 'segment':194 'settl':12,29,82 'span':54 'spars':149 'specif':90,208 'specul':215 'suggest':200 'test':219 'unit':118 'usdc':14,31,88,120,138 'usdc-settlement' 'use':87 'user':217 'via':10,27 'wallet':162 'x402':11,28,51,105 'x402 email endpoint' 'x402-payment' 'x402-protocol':50","prices":[{"id":"516d8483-1de2-4665-8041-d778f80ad232","listingId":"c7c26ea5-9c29-448e-baa3-70f42335b572","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.167Z"}],"sources":[{"listingId":"c7c26ea5-9c29-448e-baa3-70f42335b572","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.167Z","lastSeenAt":"2026-04-22T10:02:44.911Z"}],"details":{"listingId":"c7c26ea5-9c29-448e-baa3-70f42335b572","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/24 \\\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 requiring 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/emails/24"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/emails/24"}],"useCases":["Retrieving or interacting with email data via a single paid API call","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 data access","Low-volume or sporadic email API usage without subscription commitments"],"notFor":["High-volume email sending or marketing automation (no evidence of bulk support)","Users who need detailed documentation or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.366Z"},"updatedAt":"2026-04-22T10:02:44.911Z"}}