{"id":"87d1d08c-0ba5-4942-8210-381f7113a6c2","shortId":"G4ZGQK","kind":"x402","title":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/28`) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract `0x8335...2913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nThe specific functionality of `/api/v1/emails/28` is not documented beyond the generic label \"Premium API Access.\" The provider's landing page lists many endpoint categories but does not include an emails category, so the exact data returned by this particular resource is unclear. Documentation pages (`/docs`, `/pricing`, `/README`) all resolve to a minimal \"Connect wallet\" page with no further technical detail. Prospective callers should be aware that the endpoint's behavior is essentially undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-response","no-api-key","http-post"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","lowpaymentfee API","USDC micropayment API","Base network API","pay-per-call email"],"warnings":["The specific functionality of /api/v1/emails/28 is completely undocumented; the provider's landing page does not list an emails category.","All documentation pages (/docs, /pricing, /README) return only a 'Connect wallet' stub with no technical content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The endpoint description is a generic 'Premium API Access' label that provides no information about the resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/28","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/28","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 for the /emails/28 resource — no request schema, no response schema, no examples, and the docs/pricing/README pages are all blank. The endpoint's actual functionality is 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'/docs':187 '/pricing':188 '/readme':189 '0.02':10,24,80,111 '000':103 '0x8335':93 '20':102 '2913':94 '6':108 'Base network API' 'USDC micropayment API' 'accept':136 'access':36,157 'advertis':98 'ai/ml':69 'analyt':68 'api':35,64,113,156 'application/json':142 'attach':122 'awar':207 'base':8,22,88,104 'behavior':212 'beyond':151 'broader':55 'call':63 'caller':120,204 'categori':166,173 'challeng':97 'connect':195 'contract':92 'data':5,19,67,73,177 'decim':109 'detail':202 'document':150,185 'dozen':58 'email':4,18,40,172 'email API' 'email-data' 'email-rel':39 'endpoint':6,20,30,65,135,165,210 'equal':110 'essenti':214 'exact':176 'financ':71 'function':145 'gate':3,17 'generic':153 'header':127 'http':137 'http-post' 'includ':170 'infer':70 'infrastructur':75 'json-response' 'key':114 'label':154 'land':161 'limit':117 'list':163 'lowpaymentfee API' 'lowpaymentfee.com':32 'mani':164 'maxamountrequir':100 'minim':194 'network':89 'no-api-key' 'offer':57 'page':162,186,197 'paid email endpoint' 'part':52 'particular':181 'pay':9,23,61 'pay-per-cal':60 'pay-per-call email' 'pay-per-request' 'payment':48,83,126,132 'per':11,25,62,81 'platform':56 'post':138 'premium':34,155 'price':78 'proof':133 'prospect':203 'protocol':49 'provid':33,159 'rate':116 'relat':41 'request':12,26,82,139 'requir':119 'resolv':191 'resourc':42,182 'return':141,178 'settl':85 'simpli':121 'span':66 'specif':43,144 'technic':201 'unclear':184 'undocu':215 'unit':105 'usdc':14,28,91 'usdc-base' 'use':90 'util':76 'valid':130 'via':45 'wallet':196 'web3':72 'x':125 'x-payment':124 'x402':2,16,47,96,131 'x402 email' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c6b68f37-5bb3-415d-b86e-18a1be8cfd60","listingId":"87d1d08c-0ba5-4942-8210-381f7113a6c2","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.013Z"}],"sources":[{"listingId":"87d1d08c-0ba5-4942-8210-381f7113a6c2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.013Z","lastSeenAt":"2026-04-22T10:32:39.205Z"}],"details":{"listingId":"87d1d08c-0ba5-4942-8210-381f7113a6c2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/28 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/28"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/28"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating a zero-signup, wallet-authenticated API into agent workflows","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","x402 protocol experimentation and integration testing","Scenarios requiring no subscription commitment for occasional API calls"],"notFor":["Users who need well-documented, production-grade email APIs with clear schemas","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.479Z"},"updatedAt":"2026-04-22T10:32:39.205Z"}}