{"id":"7c526822-d440-4760-8b7f-8a59da7a537e","shortId":"DTL67X","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (ID 93) via the x402 payment protocol. It is live and returns a 402 challenge requiring payment of up to 20,000 base units of USDC on the Base network, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe provider hosts a broader 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 endpoints are listed at $0.02 per request and settle on the Base network in USDC. The specific endpoint being listed here (/api/v1/emails/93) is not explicitly described on the provider's landing page, so its exact functionality — whether it returns email metadata, validates an email address, or performs some other email-related operation — is unclear from available documentation.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint accepts POST requests and returns application/json, but the request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-api","pay-per-call","no-api-key","json-response"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request email"],"warnings":["The endpoint /api/v1/emails/93 is not listed on the provider's landing page among their advertised APIs — its purpose is unknown.","No documentation exists: /docs, /pricing, /api, and /README all render only a wallet-connect prompt.","No OpenAPI spec, request body schema, or response schema is available — callers cannot know what to send or what to expect.","The broader site lists many endpoint categories but provides no technical detail for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/93","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/93","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/emails/93 is not described anywhere in the crawled material, making it essentially a stub 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'/api/v1/emails/93':174 '/docs':216 '/pricing':217 '/readme':220 '/request':17,34 '0.02':16,33,81,157 '000':70 '20':69 '402':62 '6':86 '93':50 'Base network API' 'USDC micropayment API' 'accept':249 'access':42,111 'address':197 'ai/ml':129 'analysi':131 'analyt':128 'api':41,89,125 'application/json':254 'attach':98 'avail':209,246 'base':9,26,71,77,164 'base-network' 'bodi':258 'broader':118 'call':4,21,124 'caller':96 'catalog':119 'challeng':63 'classif':133 'connect':226 'convers':150 'data':6,23,127 'decim':87 'describ':178 'detail':233 'document':210,211 'email':5,22,46,192,196,203 'email API' 'email-api' 'email-rel':45,202 'embed':134 'endpoint':7,24,36,153,170,248 'equal':80 'estim':144 'exact':187 'exampl':245 'exchang':139 'explicit':177 'extrem':213 'feed':138 'financ':135 'format':259 'function':188 'gas':143 'generat':151 'geocod':148 'header':103 'host':116 'id':49 'infrastructur':146 'json-response' 'key':90 'land':183 'limit':93 'list':155,172 'live':58 'lowpaymentfee' 'lowpaymentfee.com':38 'metadata':193 'network':78,165 'no-api-key' 'openapi':237 'oper':205 'page':184,221 'paid email endpoint' 'pay':2,19,122 'pay-per-cal':1,18,121 'pay-per-call' 'pay-per-request email' 'payment':54,65,102,108 'per':3,20,82,123,158 'perform':199 'post':250 'premium':40 'price':137 'prompt':228 'proof':109 'protocol':55 'provid':39,115,181 'quot':142 'rate':92,140 'relat':47,204 'render':223 'request':83,159,251,257 'request/response':240 'requir':64,95 'resourc':48,113 'respons':261 'return':60,191,253 'schema':241 'sentiment':130 'settl':12,29,161 'simpli':97 'span':126 'spars':214 'spec':238 'specif':169 'structur':262 'summar':132 'technic':232 'token':141 'unclear':207 'unit':72 'unknown':264 'usag':244 'usdc':14,31,74,84,167 'usdc-settlement' 'use':85 'util':147 'valid':106,149,194 'via':10,27,51 'wallet':227 'web3':136 'whether':189 'x':101 'x-payment':100 'x402':11,28,53,107 'x402 email' 'x402-payment'","prices":[{"id":"cb105b2c-cad5-4fed-ba50-b3cdab3f7879","listingId":"7c526822-d440-4760-8b7f-8a59da7a537e","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.868Z"}],"sources":[{"listingId":"7c526822-d440-4760-8b7f-8a59da7a537e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.868Z","lastSeenAt":"2026-04-22T04:02:25.611Z"}],"details":{"listingId":"7c526822-d440-4760-8b7f-8a59da7a537e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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 up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/93"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/93"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing email-related data or operations on a per-call payment basis","Agent-driven workflows that need email data without managing API keys","Programmatic email lookups or processing settled via crypto micropayments"],"bestFor":["Developers or agents who want keyless, pay-per-call email API access","x402-compatible agents on the Base network with USDC","Low-volume or sporadic usage where $0.02/call is cost-effective"],"notFor":["High-volume email operations where per-call pricing adds up quickly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.098Z"},"updatedAt":"2026-04-22T04:02:25.611Z"}}