{"id":"797de355-275c-422b-9902-c8de6540f3d4","shortId":"mvtPf8","kind":"x402","title":"x402-gated email endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated email endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/70` is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse: the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/emails/70` resource actually returns. The endpoint path suggests it retrieves or processes email-related data (possibly a specific email record by ID), but this is speculative. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","email-data","pay-per-request","no-api-key","json-response"],"categories":["data","email"],"synonyms":["email API","x402 email endpoint","pay-per-call email","micropayment API","Base USDC API","lowpaymentfee","premium email access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; the actual function of /api/v1/emails/70 is unknown","The purpose of the 'emails/70' resource is entirely unclear — it could be email retrieval, validation, or something else","No agents.txt or robots.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what /api/v1/emails/70 actually does. The docs/pricing/README pages are all blank beyond a wallet connect prompt. This is effectively a stub 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'/emails/70':185 '0.02':9,26,115 '000':110 '0x8335':100 '20':109 '2913':101 '6':120 'Base USDC API' 'accept':88 'access':42,133 'actual':187 'addit':168 'advertis':124 'ai/ml':70 'analyt':69 'api':15,32,41,126,155 'attach':136 'base':7,24,84,103,111 'base-network' 'behind':79 'broader':56 'call':65 'caller':134 'challeng':214 'confirm':221 'connect':163 'contract':99 'cost':107 'crypto':73 'data':68,200 'decim':121 'descript':181 'detail':170 'doc':153 'document':148 'dozen':60 'email':4,21,198,204 'email API' 'email-data' 'email-rel':197 'endpoint':5,22,36,66,87,190,223 'equal':114 'extrem':150 'financ':72 'form':220 'gate':3,20,78 'header':141 'id':207 'infer':71 'instant':132 'json':93 'json-response' 'key':16,33,127 'limit':130 'live':216 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':106 'micropay':81 'micropayment API' 'network':85 'no-api-key' 'offer':59 'openapi':174 'oper':225 'page':158 'part':53 'path':191 'pay':8,25,63 'pay-per-cal':62 'pay-per-call email' 'pay-per-request' 'payment':46,94,140,146 'per':10,27,64,116 'platform':57,123 'possibl':201 'post':89 'premium':40 'premium email access' 'price':154 'process':196 'prompt':165 'proof':147 'protocol':47 'provid':39 'rate':129 'readm':157 'record':205 'relat':199 'render':160 'request':11,28,90,117 'request/response':177 'requir':17,34 'resourc':50,186 'retriev':194 'return':92,188 'schema':178 'servic':76 'settl':96 'simpli':135 'span':67 'spars':151 'spec':175 'specif':49,203 'specul':211 'suggest':192 'technic':169 'unit':112 'usdc':13,30,98,118 'usdc-micropayment' 'use':119 'util':75 'valid':144 'via':43 'wallet':164 'well':219 'well-form':218 'x':139 'x-payment':138 'x402':2,19,45,80,145,213 'x402 email endpoint' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1b29d81e-c91c-44a2-bffa-19bac0cad981","listingId":"797de355-275c-422b-9902-c8de6540f3d4","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.802Z"}],"sources":[{"listingId":"797de355-275c-422b-9902-c8de6540f3d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.802Z","lastSeenAt":"2026-04-22T04:02:25.554Z"}],"details":{"listingId":"797de355-275c-422b-9902-c8de6540f3d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/70 \\\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 USDC payment of 20,000 base units ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/70"},{"claim":"The platform advertises $0.02/request 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/70"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or processing email data on a per-request payment basis","Agent-driven email lookups without needing pre-provisioned API keys","Programmatic access to email resources with crypto micropayments"],"bestFor":["Agents or scripts that need on-demand email data without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, pay-as-you-go email data access"],"notFor":["High-volume email processing where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.215Z"},"updatedAt":"2026-04-22T04:02:25.554Z"}}