{"id":"a55e7412-39c9-4b56-8200-57cd912a050f","shortId":"VBAReY","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 `/api/v1/emails/59` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML, finance, and infrastructure categories. The specific resource at `/emails/59` is labeled \"Premium API Access\" and returns JSON data via HTTP POST. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme.\n\nThe platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge for this endpoint specifies a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's stated pricing. The endpoint was confirmed live, returning a proper 402 challenge with x402Version 1.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/emails/59` resource actually returns. The endpoint name suggests email-related data, but the exact payload structure and input parameters are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","email-data"],"categories":["data"],"synonyms":["email API","premium email data","x402 email endpoint","lowpaymentfee email","pay-per-call email","Base USDC API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The exact purpose and response schema of /api/v1/emails/59 is unknown; 'Premium API Access' is generic.","No OpenAPI spec or ai-plugin manifest found.","The /emails/59 path does not appear in the site's own listed API catalog, raising questions about its provenance."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/59","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and pricing matches the site's advertised $0.02. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /emails/59 resource actually returns. This is effectively a stub 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'/emails/59':62,194 '0.02':10,24,99,137 '0x8335':85 '1':157 '20000':128 '2913':86 '402':153 '6':133 'Base USDC API' 'access':67 'across':102 'actual':196 'advertis':96 'ai/ml':53 'analyt':52 'api':49,66,108,164 'base':8,22,80,129 'categori':57 'challeng':120,154 'collect':40 'commit':116 'confirm':148 'connect':173 'consist':138 'content':179 'contract':84 'data':5,19,51,71,205 'decim':134 'descript':190 'doc':163 'document':158 'email':4,18,203 'email API' 'email-data' 'email-rel':202 'endpoint':6,20,30,105,123,146,199 'equal':136 'exact':91,208 'exact-pay':90 'exampl':187 'extrem':160 'financ':54 'flat':98 'gate':3,17 'http':73 'http-post' 'infrastructur':56 'input':212 'json':70 'json-response' 'key':109 'label':64 'limit':112 'live':149 'lowpaymentfee email' 'lowpaymentfee.com':37 'maxamountrequir':126 'minimum':115 'name':200 'network':81 'openapi':183 'page':168 'paramet':213 'part':34 'pay':9,23,46 'pay-per-call email' 'pay-per-request':45 'payload':209 'payment':75,92 'per':11,25,47,100 'platform':38,95 'post':74 'premium':65 'premium email data' 'price':144,165 'prompt':175 'proper':152 'protocol':44 'rate':111 'readm':167 'relat':204 'render':170 'request':12,26,48,101 'request/response':186 'requir':117 'resourc':60,195 'return':69,150,197 'schema':184 'scheme':93 'settl':77 'site':141 'span':50 'spars':161 'specif':59 'specifi':124 'state':143 'structur':210 'suggest':201 'unit':130 'unknown':215 'usdc':14,28,83,132 'usdc-base' 'use':82 'via':72 'wallet':174 'x402':2,16,43,89,119 'x402 email endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42 'x402version':156","prices":[{"id":"87abd264-5295-4661-ab79-8eedc91db6dc","listingId":"a55e7412-39c9-4b56-8200-57cd912a050f","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.276Z"}],"sources":[{"listingId":"a55e7412-39c9-4b56-8200-57cd912a050f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.276Z","lastSeenAt":"2026-04-25T17:04:12.889Z"}],"details":{"listingId":"a55e7412-39c9-4b56-8200-57cd912a050f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/59 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/emails/59"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no further 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 provisioning","Programmatic access to premium email content via x402 micropayments"],"bestFor":["Agents or scripts that need keyless, pay-per-use API access","Developers experimenting with x402 protocol payments on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume email processing where per-request pricing adds up quickly","Anyone needing non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.125Z"},"updatedAt":"2026-04-25T17:04:12.889Z"}}