{"id":"5bdc1812-8394-44a0-8ba3-c7a85303573b","shortId":"VX4Gga","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 `/api/v1/emails/55` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/emails/55` is labeled \"Premium API Access\" in the x402 challenge, but no further documentation describes what data it returns. The endpoint is live and responds with a proper 402 challenge.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). The platform advertises no API keys, no rate limits, and instant access. Payment is made via the x402 `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/emails/55` endpoint actually returns. The endpoint path suggests email-related data (possibly a specific email record or template), but this is purely speculative based on the URL structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data"],"categories":["data"],"synonyms":["email API","x402 email endpoint","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema describing the response format","The purpose of /api/v1/emails/55 is unknown — 'Premium API Access' is a generic label","No request body schema documented; unclear what input is expected for the POST"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the /emails/55 resource actually returns. No OpenAPI schema, no request/response examples, and all doc pages are empty beyond a wallet connect prompt. The listing is effectively a 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'/emails/55':81,193 '/request':17,34 '0.02':16,33,113,128 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':154 '20':118 '402':109 '402 payment API' '6':126 'Base network API' 'USDC micropayment API' 'access':86,140 'actual':195 'address':150 'advertis':131 'ai/ml':58 'analyt':57 'api':54,85,133,163 'base':9,26,75,120,156,217 'base-network' 'call':4,21 'challeng':90,110 'collect':48 'connect':172 'content':178 'data':6,23,56,97,204 'decim':127 'describ':95 'descript':189 'doc':162 'document':94,157 'email':5,22,202,208 'email API' 'email-data' 'email-rel':201 'endpoint':7,24,36,64,101,194,198 'exact':147 'exampl':186 'extrem':159 'financ':59 'infrastructur':60 'instant':139 'key':134 'label':83 'limit':137 'live':103 'lowpaymentfee' 'lowpaymentfee.com':43 'made':143 'maxamountrequir':116 'network':76 'offer':46 'openapi':182 'page':167 'part':40 'path':199 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':68,141 'per':3,20,52,114 'platform':44,130 'possibl':205 'premium':84 'price':111,164 'prompt':174 'proper':108 'protocol':69 'pure':215 'rate':136 'readm':166 'record':209 'relat':203 'render':169 'request':53,115 'request/response':185 'resourc':79 'respond':105 'return':99,196 'schema':183 'scheme':148 'settl':12,29,70 'span':55 'spars':160 'specif':78,207 'specul':216 'structur':221 'substant':177 'suggest':200 'templat':211 'unit':121 'url':220 'usdc':14,31,72,123,153 'usdc-settlement' 'use':65,152 'via':10,27,144 'wallet':173 'x402':11,28,67,89,146 'x402 email endpoint' 'x402-payment'","prices":[{"id":"098d59df-67d1-4694-9e15-6be46692de1b","listingId":"5bdc1812-8394-44a0-8ba3-c7a85303573b","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.382Z"}],"sources":[{"listingId":"5bdc1812-8394-44a0-8ba3-c7a85303573b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.382Z","lastSeenAt":"2026-04-25T15:33:11.525Z"}],"details":{"listingId":"5bdc1812-8394-44a0-8ba3-c7a85303573b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/55"},{"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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/55"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven data access without API key management","Micropayment-gated data retrieval settled on Base L2"],"bestFor":["Agents needing keyless, pay-per-call data access","Developers experimenting with x402 payment protocol","Use cases requiring low-friction, no-subscription API access"],"notFor":["Production workloads requiring documented schemas and SLAs","Bulk email sending or transactional email delivery","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.757Z"},"updatedAt":"2026-04-25T15:33:11.525Z"}}