{"id":"227d3a99-84c1-4ce5-adfc-f92e4f863e53","shortId":"yzMFWg","kind":"x402","title":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys needed.","tagline":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys needed.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request email-related API accessible via the x402 payment protocol. The specific endpoint `/api/v1/emails/80` is described as \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network at $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe provider hosts a broader suite of APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced uniformly at $0.02 per request. However, the specific functionality of the `/api/v1/emails/80` endpoint is not documented beyond its title \"Premium API Access.\" The crawled documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no additional detail.\n\nBecause the endpoint returned a valid 402 challenge with a well-formed x402 v1 payload, it is confirmed live. The payment is routed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The timeout for payment settlement is 300 seconds. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-api","no-api-key","no-rate-limit"],"categories":["email","infrastructure"],"synonyms":["email API","premium email endpoint","x402 email","pay-per-call email","lowpaymentfee email","Base USDC API","402 payment email"],"warnings":["The specific functionality of /api/v1/emails/80 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body format, or response format is documented anywhere.","All documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no usable content.","The endpoint path includes a numeric ID (80) whose meaning is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/80","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/80","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 x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of the /api/v1/emails/80 endpoint is completely undocumented. The crawled docs/pricing/README pages were empty beyond a wallet-connect prompt. This is effectively a stub 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'/call':12,30 '0.02':11,29,80,151 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':215 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':218 '20':83 '300':227 '402':195 '402 payment email' '6':90 'Base USDC API' 'accept':68 'access':51,66,170 'addit':187 'address':214 'ai/ml':123 'analysi':126 'analyt':122 'api':6,16,24,34,50,65,93,119,169 'attach':104 'base':8,26,77,85,220 'beyond':165 'broader':116 'call':82 'caller':102 'challeng':196 'classif':128 'commit':99 'confirm':207 'connect':183 'convers':145 'crawl':172 'data':121 'decim':91 'describ':62 'detail':188,235 'doc':175 'document':164,173,236 'email':5,23,48 'email API' 'email-api' 'email-rel':47 'embed':129 'endpoint':38,59,161,191,242 'estim':139 'exampl':233 'exchang':134 'feed':133 'financ':130 'form':201 'found':238 'function':157 'gas':138 'generat':146 'geocod':143 'header':108 'host':114 'howev':154 'infer':124 'infrastructur':141 'key':17,35,94 'limit':96 'live':208 'lowpaymentfee email' 'lowpaymentfee.com':40 'need':18,36 'network':78 'no-api-key' 'no-rate-limit' 'openapi':230 'page':174 'pay':2,20,44 'pay-per-call email' 'pay-per-request':1,19,43 'payload':204 'payment':55,72,107,210,224 'per':3,21,45,81,152 'post':69 'premium':64,168 'premium email endpoint' 'price':132,148,176 'prompt':184 'protocol':56 'provid':41,113 'quot':137 'rate':95,135 'readm':177 'relat':49 'request':4,22,46,70,111,153 'request/response':232 'requir':101 'return':178,192 'rout':212 'schema':231 'second':228 'sentiment':125 'settl':71 'settlement':225 'simpli':103 'span':120 'specif':58,156,241 'suit':117 'summar':127 'timeout':222 'titl':167 'token':136 'uniform':149 'unit':86 'upfront':98 'usdc':14,32,74,88,217 'usdc-base' 'use':216 'util':142 'v1':203 'valid':144,194 'via':9,27,52 'wallet':182 'wallet-connect':181 'web3':131 'well':200 'well-form':199 'x402':10,28,54,106,202 'x402 email' 'x402-payment'","prices":[{"id":"e982112a-2dfe-4817-888d-67fb5e26fa4a","listingId":"227d3a99-84c1-4ce5-adfc-f92e4f863e53","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.733Z"}],"sources":[{"listingId":"227d3a99-84c1-4ce5-adfc-f92e4f863e53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.733Z","lastSeenAt":"2026-04-22T04:02:25.490Z"}],"details":{"listingId":"227d3a99-84c1-4ce5-adfc-f92e4f863e53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 v1 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/emails/80"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/80"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving email data on a per-request payment basis without managing API keys","Agent-driven workflows that need email functionality with instant crypto-settled access","Integrating email capabilities into Web3 applications using on-chain micropayments"],"bestFor":["Developers wanting zero-setup, pay-as-you-go email API access","AI agents that can settle x402 payments autonomously on Base","Projects needing email functionality without subscription commitments"],"notFor":["High-volume email senders who need bulk pricing or dedicated throughput","Users who require detailed API documentation and schema guarantees before integration","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.262Z"},"updatedAt":"2026-04-22T04:02:25.490Z"}}