{"id":"8dcfcd03-19a2-472b-b055-c16dabee40d3","shortId":"Vz8Y3b","kind":"x402","title":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/8` 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 micro-payments 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, no minimums, and instant access. The x402 challenge was successfully captured with version 1 of the protocol and a 300-second payment timeout.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/emails/8` endpoint actually does or what input it expects. The \"emails/8\" path suggests it may retrieve or interact with a specific email resource (ID 8), but this is purely speculative. Without documentation or example payloads, integrators will need to experiment to determine the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-api","json-response","no-api-key","micro-payment"],"categories":["email","infrastructure"],"synonyms":["email API","x402 email","pay-per-call email","USDC email endpoint","Base network API","micro-payment API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema provided for request or response","Purpose of /api/v1/emails/8 is unknown — 'Premium API Access' is a generic label used across all endpoints","The platform lists many endpoint categories but none specifically mention an 'emails' category, raising questions about this resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/8","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for this specific endpoint — no OpenAPI spec, no request/response examples, no description of what 'emails/8' does. Docs pages render only 'Connect wallet'. This is effectively a stub 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'0.02':9,26,117 '000':112 '0x8335':102 '1':146 '20':111 '2913':103 '300':152 '6':122 '8':216 'Base network API' 'USDC email endpoint' 'accept':90 'access':42,137 'actual':194 'advertis':126 'ai/ml':70 'analyt':69 'api':16,33,41,128,163 'base':7,24,86,105,113 'behind':79 'bodi':237 'broader':56 'call':65 'captur':143 'challeng':140 'connect':171 'content':177 'contract':101 'cost':109 'crypto':73 'data':68 'decim':123 'descript':188 'determin':233 'doc':161 'document':156,223 'dozen':60 'email':4,21,213 'email API' 'email-api' 'emails/8':202 'endpoint':5,22,36,66,89,193 'equal':116 'exampl':225 'expect':200,235 'experi':231 'extrem':158 'financ':72 'format':240 'gate':3,20,78 'id':215 'infer':71 'input':198 'instant':136 'integr':227 'interact':209 'json':95 'json-response' 'key':17,34,129 'limit':132 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':108 'may':206 'micro':82 'micro-pay':81 'micro-payment' 'micro-payment API' 'minimum':134 'need':229 'network':87 'no-api-key' 'offer':59 'openapi':181 'page':166 'part':53 'path':203 'pay':8,25,63 'pay-per-cal':62 'pay-per-call email' 'pay-per-request' 'payload':226 'payment':46,83,96,154 'per':10,27,64,118 'platform':57,125 'post':91 'premium':40 'price':162 'prompt':173 'protocol':47,149 'provid':39 'pure':220 'rate':131 'readm':165 'render':168 'request':11,28,92,119,236 'request/response':184 'resourc':50,214 'respons':239 'retriev':207 'return':94 'schema':185 'second':153 'servic':76 'settl':98 'span':67 'spars':159 'spec':182 'specif':49,212 'specul':221 'substant':176 'success':142 'suggest':204 'timeout':155 'unit':114 'usdc':13,30,100,120 'usdc-base' 'use':121 'util':75 'version':145 'via':43 'wallet':172 'without':222 'x402':2,19,45,80,139 'x402 email' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"af37f44a-4ba6-49bb-b12a-e33006bb6c14","listingId":"8dcfcd03-19a2-472b-b055-c16dabee40d3","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.636Z"}],"sources":[{"listingId":"8dcfcd03-19a2-472b-b055-c16dabee40d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.636Z","lastSeenAt":"2026-04-22T05:31:59.812Z"}],"details":{"listingId":"8dcfcd03-19a2-472b-b055-c16dabee40d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/8 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/8"},{"claim":"Platform pricing is $0.02 per request 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/8"}],"useCases":["Accessing email data or functionality via a single micro-payment call","Integrating pay-per-use email operations into agent workflows","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 micro-payment APIs","Agents needing keyless, pay-per-call email access","Low-volume, on-demand email operations without subscriptions"],"notFor":["Production email workflows requiring documented schemas and SLAs","High-volume email sending where per-request pricing is inefficient","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.382Z"},"updatedAt":"2026-04-22T05:31:59.812Z"}}