{"id":"cc88250d-370a-4516-a2ca-f9cd31d24507","shortId":"cQbdxP","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/83`) 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 suite of pay-per-request APIs 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no commitments required. Payments are made via x402 using USDC on the Base network.\n\nThe specific `/api/v1/emails/83` endpoint is not listed on the site's main catalog, and its exact functionality is unclear — the description simply reads \"Premium API Access.\" There is no OpenAPI schema, no documentation beyond the landing page, and the docs/pricing/API pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-response","no-api-key","post-method"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","micropayment API","pay-per-call email"],"warnings":["The /api/v1/emails/83 endpoint is not listed in the site's public API catalog — its purpose is unclear.","No documentation, OpenAPI spec, or response schema is available for this endpoint.","The docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content.","The exact data returned by this endpoint is unknown; integrate with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/83","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific /emails/83 resource is not described anywhere on the site. The endpoint's actual functionality is unknown beyond the generic 'Premium API Access' 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'0.02':10,24,72,134 '000':74 '20':73 '402':57 '6':80 'Base network API' 'USDC API' 'accept':213 'access':36,184 'addit':209 'address':87 'advertis':92 'ai':104 'analysi':108 'analyt':103 'api':35,100,139,183 'application/json':218 'base':8,22,65,75,157 'beyond':192 'broader':89 'catalog':171 'challeng':58 'classif':110 'commit':146 'connect':204 'content':210 'convers':127 'cost':68 'data':5,19,102 'decim':81 'descript':179 'docs/pricing/api':198 'document':191 'email':4,18,40 'email API' 'email-data' 'email-rel':39 'embed':111 'endpoint':6,20,30,51,130,162,212 'estim':121 'exact':174 'exchang':116 'feed':115 'financ':112 'function':175 'gas':120 'gate':3,17 'generat':128 'geocod':125 'infrastructur':123 'json-response' 'key':140 'land':194 'learn':106 'limit':143 'list':165 'live':53 'lowpaymentfee' 'lowpaymentfee.com':32,90 'machin':105 'made':150 'main':170 'micropayment API' 'network':66,158 'no-api-key' 'openapi':188 'page':195,199 'paid email endpoint' 'pay':9,23,97 'pay-per-call email' 'pay-per-request':96 'payment':48,60,148 'per':11,25,69,98,135 'platform':91 'post':214 'post-method' 'premium':34,182 'price':114,132 'prompt':206 'protocol':49 'provid':33 'quot':119 'rate':117,142 'read':181 'relat':41 'render':201 'request':12,26,70,99,136,215 'requir':59,147 'resourc':42 'return':55,217 'schema':189 'sentiment':107 'settl':82 'simpli':180 'site':168 'span':101 'specif':43,160 'specifi':85 'suit':94 'summar':109 'token':118 'unclear':177 'unit':76 'usdc':14,28,62,78,154 'usdc-base' 'use':153 'util':124 'valid':126 'via':45,151 'wallet':86,205 'web3':113 'x402':2,16,47,152 'x402 email' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c59b7484-1526-4ce5-ae53-3fa9e216a5fc","listingId":"cc88250d-370a-4516-a2ca-f9cd31d24507","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.802Z"}],"sources":[{"listingId":"cc88250d-370a-4516-a2ca-f9cd31d24507","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.802Z","lastSeenAt":"2026-04-22T05:31:59.995Z"}],"details":{"listingId":"cc88250d-370a-4516-a2ca-f9cd31d24507","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/83 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/83"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/83"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven workflows that need email data without API key provisioning","Programmatic access to premium email content gated by crypto micropayment"],"bestFor":["Agents or scripts that can settle x402 payments in USDC on Base","Use cases requiring no-signup, no-API-key access to email data","Low-volume, pay-as-you-go consumption of premium data"],"notFor":["Users who need detailed documentation or schema before integrating","High-volume use cases where per-request pricing may add up","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.145Z"},"updatedAt":"2026-04-22T05:31:59.995Z"}}