{"id":"c2d7e513-2e6d-4bcf-a767-8cd077e698aa","shortId":"afpC2b","kind":"x402","title":"Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com provides a premium email-related API accessible via the x402 payment protocol. The specific endpoint `/api/v1/emails/2` accepts POST requests and charges $0.02 per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). Payment is settled on-chain to a Base address using USD Coin (USDC), with no API keys, rate limits, or upfront commitments required.\n\nThe endpoint is part of a broader platform offering dozens of pay-per-call APIs across categories including data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform share the same $0.02/request pricing model.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. The exact functionality of the `/api/v1/emails/2` endpoint (e.g., whether it sends emails, validates them, or retrieves email data) is not documented anywhere in the crawled material. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json, but no request or response schema is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","email-api","no-api-key","post-endpoint"],"categories":["email","utility"],"synonyms":["email API","x402 email","pay-per-request email","USDC email endpoint","Base network API","lowpaymentfee email"],"warnings":["No documentation available — all doc/pricing/README pages show only 'Connect wallet'","The exact purpose of /api/v1/emails/2 is unknown (send, validate, retrieve, etc.)","No request or response schema provided","No examples of expected input or output"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge confirms the endpoint is live and priced at $0.02 USDC on Base, but there is zero documentation on what the email endpoint actually does, no request/response schema, and all doc pages render only 'Connect wallet'. This is effectively a stub 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'/request':12,30,158 '0.02':11,29,63,157 '000':67 '20':66 '6':79 'Base network API' 'USDC email endpoint' 'accept':58,219 'access':48 'across':121 'address':90 'ai/ml':126 'analysi':128 'analyt':125 'anywher':205 'api':6,16,24,34,47,97,120,167 'application/json':223 'base':8,26,68,74,89 'broader':111 'call':4,22,65,119 'categori':122 'chain':86 'challeng':212 'charg':62 'classif':130 'coin':93 'commit':103 'confirm':213 'connect':176 'convers':147 'crawl':208 'data':124,201 'decim':80 'detail':183 'doc':166 'document':161,204 'dozen':114 'e.g':191 'email':5,23,45,195,200 'email API' 'email-api' 'email-rel':44 'embed':131 'endpoint':38,56,106,150,190,215 'estim':141 'exact':185 'exchang':136 'extrem':163 'feed':135 'financ':132 'function':186 'gas':140 'generat':148 'geocod':145 'includ':123 'infrastructur':143 'key':17,35,98 'limit':100 'live':217 'lowpaymentfee email' 'lowpaymentfee.com':40 'materi':209 'model':160 'network':75 'no-api-key' 'offer':113 'on-chain':84 'page':171 'part':108 'pay':2,20,117 'pay-per-cal':1,19,116 'pay-per-call' 'pay-per-request email' 'payment':52,81 'per':3,21,64,118 'platform':112,153 'post':59,220 'post-endpoint' 'premium':43 'price':134,159,168 'prompt':178 'protocol':53 'provid':41,231 'quot':139 'rate':99,137 'readm':170 'relat':46 'render':173 'request':60,221,226 'requir':18,36,104 'respons':228 'retriev':199 'return':222 'schema':229 'send':194 'sentiment':127 'settl':83 'share':154 'spars':164 'specif':55 'summar':129 'technic':182 'token':138 'unit':69 'upfront':102 'usd':92 'usdc':14,32,71,77,94 'usdc-base' 'use':91 'util':144 'valid':146,196 'via':9,27,49 'wallet':177 'web3':133 'whether':192 'x402':10,28,51,211 'x402 email' 'x402-payment'","prices":[{"id":"5d1fa28e-b988-4c76-8c5a-afedacf11111","listingId":"c2d7e513-2e6d-4bcf-a767-8cd077e698aa","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.721Z"}],"sources":[{"listingId":"c2d7e513-2e6d-4bcf-a767-8cd077e698aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.721Z","lastSeenAt":"2026-04-22T11:32:42.634Z"}],"details":{"listingId":"c2d7e513-2e6d-4bcf-a767-8cd077e698aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/2"},{"claim":"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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/2"}],"useCases":["Programmatic email operations without needing API key registration","Agent-driven email workflows with micropayment settlement","On-demand email functionality paid per call via crypto"],"bestFor":["Developers wanting zero-signup API access for email tasks","AI agents that can settle x402 payments on Base","Users who prefer pay-as-you-go with no rate limits"],"notFor":["Users needing detailed API documentation before integration","High-volume email operations where per-call pricing is costly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.832Z"},"updatedAt":"2026-04-22T11:32:42.634Z"}}