{"id":"e678236f-cabe-4499-8ac2-8d2a7e67f1a5","shortId":"aycJVJ","kind":"x402","title":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/75` appears to be an email-related endpoint, though the crawled documentation does not describe its exact functionality — the site lists many API categories (data & analytics, AI/ML, finance, infrastructure) but does not include an explicit emails section.\n\nThe endpoint is live and returns a standard x402 402 challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with the \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The endpoint accepts HTTP POST requests.\n\nThe provider advertises no API keys, no rate limits, and instant access. Documentation beyond the landing page is effectively empty (all sub-pages just show \"Connect wallet\"), so there is no schema documentation, request/response examples, or detailed description of what the emails/75 endpoint actually returns. This makes it difficult to assess the endpoint's real utility without making a paid call.","tags":[],"capabilities":["x402-payment","usdc-base","email-api","pay-per-request","no-api-key"],"categories":["email","infrastructure"],"synonyms":["email API","x402 email","pay-per-call email","USDC email endpoint","lowpaymentfee email","Base network API"],"warnings":["No documentation available — all doc/pricing/README pages are empty beyond 'Connect wallet'","The /api/v1/emails/75 path is not listed among the site's advertised API categories, so its purpose is unclear","No request or response schema is provided; callers cannot know what to send or expect back","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/75","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/75","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, but there is no documentation, no request/response schema, and no description of what the emails/75 resource actually does. All doc pages return only 'Connect wallet' with no content. The listing is essentially a 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'/request':142 '0.02':9,26,129,141 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':120 '402':98 '6':126 'Base network API' 'USDC email endpoint' 'accept':148 'access':42,163 'across':143 'actual':196 'advertis':137,154 'ai/ml':78 'amount':117 'analyt':77 'api':16,33,41,74,156 'appear':52 'assess':203 'base':7,24,105,122 'beyond':165 'call':213 'categori':75 'challeng':99 'connect':178 'consist':132 'contract':109 'crawl':62 'data':76 'decim':127 'describ':66 'descript':190 'detail':189 'difficult':201 'document':63,164,185 'effect':170 'email':4,21,57,87 'email API' 'email-api' 'email-rel':56 'emails/75':194 'empti':171 'endpoint':5,22,36,59,90,145,147,195,205 'equal':128 'exact':68,113 'exampl':187 'explicit':86 'financ':79 'flat':138 'function':69 'gate':3,20 'http':149 'includ':84 'infrastructur':80 'instant':162 'key':17,34,157 'land':167 'limit':160 'list':72 'live':92 'lowpaymentfee email' 'lowpaymentfee.com':38 'make':199,210 'mani':73 'maximum':116 'network':106 'no-api-key' 'page':168,175 'paid':212 'pay':8,25 'pay-per-call email' 'pay-per-request' 'payment':46,100 'per':10,27,130 'post':150 'premium':40 'price':139 'protocol':47 'provid':39,153 'rate':159 'real':207 'relat':58 'request':11,28,131,151 'request/response':186 'requir':118 'resourc':50 'return':94,197 'schema':184 'scheme':114 'section':88 'settl':102 'show':177 'site':71,135 'specif':49 'standard':96 'sub':174 'sub-pag':173 'though':60 'unit':123 'usdc':13,30,108 'usdc-base' 'use':107 'util':208 'via':43 'wallet':179 'without':209 'x402':2,19,45,97 'x402 email' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d97a4e0c-5314-48ac-b374-f4d910254500","listingId":"e678236f-cabe-4499-8ac2-8d2a7e67f1a5","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.692Z"}],"sources":[{"listingId":"e678236f-cabe-4499-8ac2-8d2a7e67f1a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.692Z","lastSeenAt":"2026-04-22T05:31:59.877Z"}],"details":{"listingId":"e678236f-cabe-4499-8ac2-8d2a7e67f1a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/75 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/75"},{"claim":"The site advertises $0.02/request flat pricing 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/75"}],"useCases":["Fetching or sending email data via a single paid API call","Agent-driven email workflows where per-request billing is preferred over subscriptions","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-use email access without API key management","Low-volume, on-demand email operations"],"notFor":["High-volume email sending requiring bulk pricing","Users who need detailed API documentation before integrating","Production email workflows requiring SLAs or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.378Z"},"updatedAt":"2026-04-22T05:31:59.877Z"}}