{"id":"7bbd8f0c-e5f5-4cbf-b617-a26f249c29f5","shortId":"Ppgy4T","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call email data endpoint on Base via x402 — $0.02/request in USDC.","description":"This endpoint at `/api/v1/emails/91` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific resource at `/emails/91` is labeled \"Premium API Access\" but its exact functionality is unclear — the path suggests it returns email-related data for a specific record (ID 91), but no documentation, schema, or example responses are available to confirm what it actually returns.\n\nThe endpoint is live and responds with a valid x402 challenge. Payment is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-call USDC micropayments.\n\nThe broader lowpaymentfee.com platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request. However, documentation pages (/docs, /pricing, /api, /README) all render only a \"Connect wallet\" prompt with no substantive content, making it impossible to verify what data or functionality any of these endpoints actually provide.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","no-api-key","micropayment"],"categories":["data"],"synonyms":["email API","email lookup","premium email data","x402 email endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","The exact data returned by /api/v1/emails/91 is unknown; no output schema or examples exist","The endpoint path suggests a single fixed record (ID 91) rather than a parameterized query","Provider legitimacy and data quality cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/91","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/91","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 no documentation, no response schema, no example payloads, and the docs/pricing/README pages are all empty stubs. The purpose of the /emails/91 endpoint is unclear, making this effectively a stub 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'/api/v1/emails/91':34 '/docs':186 '/emails/91':66 '/pricing':187 '/readme':189 '/request':13,28 '0.02':12,27,133,180 '000':122 '0x8335':127 '20':121 '2913':128 '300':143 '91':92 'Base network API' 'USDC API' 'access':71,154 'across':170 'actual':106,214 'advertis':153 'ai/ml':172 'api':50,70,147 'avail':101 'base':9,24,58,123,130 'base-network' 'broader':165 'call':4,19,161 'categori':176 'challeng':118 'collect':44 'confirm':103 'connect':194 'content':200 'data':6,21,86,207 'data/analytics':171 'document':95,184 'email':5,20,84 'email API' 'email lookup' 'email-data' 'email-rel':83 'endpoint':7,22,32,109,169,213 'equal':132 'exact':74,140 'exampl':98 'finance/web3':173 'function':75,209 'grant':156 'howev':183 'id':91 'imposs':203 'infrastructur':175 'key':148 'label':68 'limit':151 'list':168 'live':111 'lowpaymentfee' 'lowpaymentfee.com':39,166 'make':201 'micropay':163 'micropayment' 'network':59 'no-api-key' 'offer':42 'page':185 'part':36 'path':79 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':119,137 'per':3,18,48,134,160,181 'per-cal':159 'platform':40,167 'premium':69 'premium email data' 'price':178 'prompt':196 'protocol':55 'provid':215 'pure':157 'rate':150 'record':90 'relat':85 'render':191 'request':49,135,182 'resourc':64 'respond':113 'respons':99 'return':82,107 'schema':96 'scheme':138 'second':144 'settl':51 'specif':63,89 'substant':199 'suggest':80 'timeout':145 'unclear':77 'unit':124 'usdc':15,30,61,126,162 'usdc-settlement' 'use':60 'valid':116 'verifi':205 'via':10,25,52 'wallet':195 'x402':11,26,54,117 'x402 email endpoint' 'x402-payment'","prices":[{"id":"39e056c0-788e-44de-8b17-45543616d2c5","listingId":"7bbd8f0c-e5f5-4cbf-b617-a26f249c29f5","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:13.040Z"}],"sources":[{"listingId":"7bbd8f0c-e5f5-4cbf-b617-a26f249c29f5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:13.040Z","lastSeenAt":"2026-04-25T13:03:36.255Z"}],"details":{"listingId":"7bbd8f0c-e5f5-4cbf-b617-a26f249c29f5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/91 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/91"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/91"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data records via micropayment","Agent-driven data access without API key management","On-chain settled API calls for email information"],"bestFor":["Agents that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols","Use cases requiring on-chain payment receipts for API calls"],"notFor":["Production workloads requiring documented response schemas and SLAs","Bulk email operations or email sending","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.876Z"},"updatedAt":"2026-04-25T13:03:36.255Z"}}