{"id":"b5be31af-5478-43e9-b11b-798f1b7ba54f","shortId":"zvJ8Ta","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/78`) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals), settled to a specified wallet address.\n\nThe broader lowpaymentfee.com platform advertises a range of pay-per-request API endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access via x402 on the Base network.\n\nHowever, the specific `/api/v1/emails/78` endpoint is not listed among the publicly documented APIs on the landing page, and no documentation, request schema, or response schema is available for it. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the exact functionality of this email endpoint — whether it retrieves email data, validates an email, or performs some other operation — remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","http-post"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","premium email access"],"warnings":["The /api/v1/emails/78 endpoint is not listed among the provider's publicly documented APIs — its exact purpose is unknown.","No request or response schema is available; integration requires trial and error.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no content.","The nature of the 'email' resource at ID 78 is unclear — it could be test data, a specific record, or a placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/78","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/78","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 402 challenge, but there is no documentation, no request/response schema, and the specific /api/v1/emails/78 path is not listed among the provider's publicly advertised endpoints. The crawled docs/pricing/README pages are empty stubs. This is effectively a stub listing with minimal actionable 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'0.02':10,24,72,133 '000':74 '20':73 '402':57 '6':80 'Base network API' 'USDC API' 'access':36,147 'address':87 'advertis':92 'ai':105 'among':162 'analysi':109 'analyt':104 'api':35,100,140,166 'avail':180 'base':8,22,65,75,152 'broader':89 'call':135 'challeng':58 'classif':111 'connect':194 'content':200 'convers':128 'cost':68 'crawl':184 'data':5,19,103,215 'decim':81 'doc':185 'document':165,173,203 'email':4,18,40,209,214,218 'email API' 'email-data' 'email-rel':39 'embed':112 'emphas':138 'endpoint':6,20,30,51,101,158,210 'estim':122 'exact':205 'exchang':117 'feed':116 'financ':113 'function':206 'gas':121 'gate':3,17 'generat':129 'geocod':126 'howev':154 'http-post' 'infrastructur':124 'instant':146 'key':141 'land':169 'learn':107 'limit':144 'list':161 'live':53 'lowpaymentfee' 'lowpaymentfee.com':32,90 'machin':106 'network':66,153 'oper':223 'page':170,189 'paid email endpoint' 'pay':9,23,97 'pay-per-request':96 'payment':48,60 'per':11,25,69,98,134 'perform':220 'platform':91,137 'premium':34 'premium email access' 'price':115,131,186 'prompt':196 'protocol':49 'provid':33 'public':164 'quot':120 'rang':94 'rate':118,143 'readm':188 'relat':41 'remain':224 'request':12,26,70,99,174 'requir':59 'resourc':42 'respons':177 'retriev':213 'return':55,191 'schema':175,178 'sentiment':108 'settl':82 'span':102 'specif':43,156 'specifi':85 'substant':199 'summar':110 'token':119 'unclear':225 'unit':76 'usdc':14,28,62,78 'usdc-base' 'util':125 'valid':127,216 'via':45,148 'wallet':86,195 'web3':114 'whether':211 'without':201 'x402':2,16,47,149 'x402 email' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7b049af7-b89c-4dad-9c8c-3d12b4495eba","listingId":"b5be31af-5478-43e9-b11b-798f1b7ba54f","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.841Z"}],"sources":[{"listingId":"b5be31af-5478-43e9-b11b-798f1b7ba54f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.841Z","lastSeenAt":"2026-04-22T04:02:25.575Z"}],"details":{"listingId":"b5be31af-5478-43e9-b11b-798f1b7ba54f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/78 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/78"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/78"},{"claim":"The docs, pricing, README, and api pages all returned only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or accessing email-related data behind a micropayment wall","Agent-driven workflows that need on-demand email information without API key management","Programmatic access to premium email resources paid per call in USDC"],"bestFor":["Agents or developers who want keyless, pay-per-request email data access","Use cases requiring micropayment-gated API calls on Base L2","Workflows that benefit from no rate limits and instant access"],"notFor":["Users who need well-documented API schemas and response formats before integrating","High-volume use cases where per-request pricing at $0.02 adds up significantly","Anyone needing non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.25Z"},"updatedAt":"2026-04-22T04:02:25.575Z"}}