{"id":"690aa3bc-85d6-45fe-8c21-0de546d439d0","shortId":"DEYMnb","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/92` 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 `/api/v1/emails/92` is listed under \"Premium API Access\" but its exact functionality is not well-documented — the path suggests it returns data related to a specific email record (ID 92), though the crawled documentation is extremely sparse and provides no schema or field-level details.\n\nThe endpoint is live and returns a valid x402 challenge. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 `exact` scheme to the specified wallet address on Base. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation beyond the landing page is effectively empty (all subpages just show \"Connect wallet\"), so the request/response schema, required POST body fields, and the precise nature of the returned email data are unknown. This limits the endpoint's usefulness for agents that need to understand input/output contracts before calling.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-response","no-api-key"],"categories":["data"],"synonyms":["email API","email lookup","email data endpoint","x402 email","micropayment API","Base USDC API","pay-per-call email"],"warnings":["No documentation available — all doc pages return only 'Connect wallet'","Request body schema is unknown; no examples or field descriptions provided","Response schema is unknown; the exact data returned by this endpoint is undocumented","The specific purpose of /api/v1/emails/92 is unclear from available materials","The site lists many diverse API categories but provides no evidence of actual implementation behind them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/92","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/92","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 documentation is nearly nonexistent — all doc/pricing/API pages render only 'Connect wallet'. No request or response schema is available, and the purpose of the /emails/92 resource is unclear. This is effectively a stub 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'/request':17,34,160 '0.02':16,33,150,159 '000':141 '20':140 '6':146 '92':110 'Base USDC API' 'accept':182 'access':87,196 'across':162 'address':177 'advertis':195 'agent':242 'ai/ml':58 'analyt':57 'api':54,86,189 'application/json':187 'base':9,26,75,142,179 'beyond':203 'bodi':222 'call':4,21,250 'challeng':136 'collect':48 'connect':214 'consist':153 'contract':248 'crawl':113 'data':6,23,56,102,232 'decim':147 'detail':126 'document':96,114,202 'effect':208 'email':5,22,107,231 'email API' 'email data endpoint' 'email lookup' 'email-data' 'empti':209 'endpoint':7,24,36,64,128,164,181,238 'equal':149 'exact':90,171 'extrem':116 'field':124,223 'field-level':123 'financ':59 'function':91 'gate':198 'id':109 'infrastructur':60 'input/output':247 'json-response' 'key':190 'land':205 'level':125 'limit':193,236 'list':83 'live':130 'lowpaymentfee.com':43 'made':167 'micropay':201 'micropayment API' 'natur':227 'need':244 'network':76 'no-api-key' 'offer':46 'page':206 'part':40 'path':98 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':68,165 'per':3,20,52,151 'platform':44 'post':183,221 'precis':226 'premium':85 'price':138,161 'protocol':69 'provid':119 'pure':199 'rate':192 'record':108 'relat':103 'request':53,152,184 'request/response':218 'requir':220 'resourc':79 'return':101,132,186,230 'schema':121,219 'scheme':172 'settl':12,29,70 'show':213 'site':156 'span':55 'spars':117 'specif':78,106 'specifi':175 'subpag':211 'suggest':99 'though':111 'understand':246 'uniform':158 'unit':143 'unknown':234 'usdc':14,31,72,145 'usdc-base' 'use':65,240 'valid':134 'via':10,27,168 'wallet':176,215 'well':95 'well-docu':94 'x402':11,28,67,135,170 'x402 email' 'x402-payment'","prices":[{"id":"a097b84b-c4b2-4221-bb64-801fd4c57c4e","listingId":"690aa3bc-85d6-45fe-8c21-0de546d439d0","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.925Z"}],"sources":[{"listingId":"690aa3bc-85d6-45fe-8c21-0de546d439d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.925Z","lastSeenAt":"2026-04-25T13:03:36.122Z"}],"details":{"listingId":"690aa3bc-85d6-45fe-8c21-0de546d439d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/92 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/92"},{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/92"}],"useCases":["Retrieving email-related data records by ID via micropayment","Agent-driven data access without API key provisioning","Programmatic pay-per-use data retrieval on Base network"],"bestFor":["Agents needing keyless, pay-per-call data access","Developers experimenting with x402 micropayment protocols","Scenarios where low-friction, no-subscription API access is preferred"],"notFor":["Production use cases requiring documented request/response schemas","Bulk email operations or sending emails","Use cases needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.005Z"},"updatedAt":"2026-04-25T13:03:36.122Z"}}