{"id":"bf47a029-79ee-4e36-befc-20ee730e55de","shortId":"4gkKC6","kind":"x402","title":"Bulk email list endpoint (100 emails) via x402 micropayment on Base network.","tagline":"Bulk email list endpoint (100 emails) via x402 micropayment on Base network.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to an email-related resource at the path `/api/v1/emails/100`. The endpoint accepts POST requests and is gated behind an x402 payment challenge, settling in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe provider's landing page advertises a broad catalog of pay-per-call APIs spanning 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 priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific `/api/v1/emails/100` endpoint is not listed on the landing page, and no documentation, input schema, or example responses are available for it. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no documentation describing what this endpoint actually returns — whether it generates, validates, or retrieves email addresses — its exact functionality remains unclear. The endpoint is confirmed live (returning a valid 402 challenge), but users should be aware that the lack of documentation makes it difficult to predict the response format or required request body.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-api","pay-per-request","no-api-key"],"categories":["data","email"],"synonyms":["email API","email list","bulk email","email generation","email endpoint","x402 email","micropayment API","pay-per-call email"],"warnings":["The /api/v1/emails/100 endpoint is not listed on the provider's landing page — its purpose is unclear.","No documentation, input schema, or example responses are available for this endpoint.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content.","The endpoint may involve email addresses, which could raise privacy or anti-spam concerns depending on the actual data returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/100","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/100","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 zero documentation on what it does, what inputs it expects, or what it returns. The /api/v1/emails/100 path is not even listed on the provider's own landing page. No OpenAPI spec, no examples, and all doc pages are 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'0.02':69,123 '000':71 '100':5,17 '20':70 '402':210 '6':77 'accept':46 'access':33 'actual':187 'address':196 'advertis':84 'ai/ml':97 'analysi':99 'analyt':96 'api':93,128,162 'avail':157 'awar':216 'base':11,23,62,72 'base-network' 'behind':52 'bodi':233 'broad':86 'bulk':1,13 'bulk email' 'call':92 'catalog':87 'challeng':56,211 'classif':101 'commit':135 'confirm':205 'connect':171 'content':177 'convers':118 'data':95 'decim':78 'describ':183 'difficult':224 'doc':161 'document':150,182,221 'email':2,6,14,18,37,195 'email API' 'email endpoint' 'email generation' 'email list' 'email-api' 'email-rel':36 'embed':102 'enabl':28 'endpoint':4,16,29,45,140,186,203 'estim':112 'exact':198 'exampl':154 'exchang':107 'feed':106 'financ':103 'format':229 'function':199 'gas':111 'gate':51 'generat':119,191 'geocod':116 'howev':136 'infrastructur':114 'input':151 'key':129 'lack':219 'land':82,146 'limit':132 'list':3,15,143 'live':206 'lowpaymentfee.com':31 'make':222 'micropay':9,21 'micropayment API' 'network':12,24,63 'no-api-key' 'page':83,147,166 'path':42 'pay':90 'pay-per-cal':89 'pay-per-call email' 'pay-per-request' 'payment':55 'per':66,91,124 'post':47 'predict':226 'price':65,105,121,163 'prompt':173 'provid':32,80 'quot':110 'rate':108,131 'readm':165 'relat':38 'remain':200 'request':48,67,125,232 'requir':231 'resourc':39 'respons':155,228 'retriev':194 'return':168,188,207 'schema':152 'sentiment':98 'settl':57 'span':94 'specif':138 'substant':176 'summar':100 'token':109 'unclear':201 'unit':73 'usdc':59,75 'usdc-settlement' 'user':213 'util':115 'valid':117,192,209 'via':7,19 'wallet':172 'web3':104 'whether':189 'x402':8,20,27,54 'x402 email' 'x402-enabled':26 'x402-payment'","prices":[{"id":"98f86019-e59d-4893-9de4-153658a12349","listingId":"bf47a029-79ee-4e36-befc-20ee730e55de","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.503Z"}],"sources":[{"listingId":"bf47a029-79ee-4e36-befc-20ee730e55de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.503Z","lastSeenAt":"2026-04-22T13:32:09.087Z"}],"details":{"listingId":"bf47a029-79ee-4e36-befc-20ee730e55de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/100 \\\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 valid x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/100"},{"claim":"The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/100"},{"claim":"The /api/v1/emails/100 path is not listed among the provider's advertised API endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Purchasing a batch of email addresses or email-related data via a single API call","Integrating email data retrieval into automated agent workflows without API key management","Pay-per-use email operations settled in USDC on Base"],"bestFor":["Agents needing on-demand email data without subscription commitments","Developers experimenting with x402 payment-gated APIs","Workflows requiring crypto-settled, keyless API access"],"notFor":["Production use cases requiring well-documented input/output schemas","Users who need free or fiat-only payment options","High-volume email operations where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.146Z"},"updatedAt":"2026-04-22T13:32:09.087Z"}}