{"id":"5751db2c-3ac0-42ba-b2ac-d6599b59cd79","shortId":"J5m4Rg","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/62`) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) requiring payment of up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme to the specified payTo address. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nThe specific functionality behind `/api/v1/emails/62` is not documented in the crawled material — the site's landing page lists categories like Data & Analytics, AI & ML, Finance, and Infrastructure, but does not mention an emails endpoint. The resource ID `62` suggests it may return data about or related to a specific email record, but this is speculative. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","email-data","json-response"],"categories":["data"],"synonyms":["email API","x402 email endpoint","pay-per-call API","USDC micropayment API","lowpaymentfee API","Base network API","402 payment email"],"warnings":["The specific functionality of /api/v1/emails/62 is undocumented — the emails category does not appear on the site's landing page","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no usable content","No request body schema or response schema is available; integration requires trial and error","The resource ID '62' is opaque — it is unknown whether this is a fixed resource or parameterized"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/62","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/62","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 challenge, but there is no documentation, no request/response schema, and the specific purpose of /api/v1/emails/62 is unclear. The docs, pricing, and README pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/docs':212 '/pricing':213 '/readme':214 '0.02':10,24,81,115 '000':102 '0x8335':107 '20':101 '2913':108 '402':95 '402 payment email' '6':119 '62':192 'Base network API' 'USDC micropayment API' 'accept':135 'access':36,149 'addit':223 'address':132 'advertis':148 'ai':177 'ai/ml':70 'analyt':69,176 'api':35,66,142 'application/json':140 'base':8,22,103,111 'base-network' 'behind':158 'broader':55 'call':65 'categori':173 'challeng':93 'connect':218 'content':224 'crawl':165 'data':5,19,68,74,175,197 'decim':120 'document':162,210 'email':4,18,40,187,204 'email API' 'email-data' 'email-rel':39 'endpoint':6,20,30,85,134,188 'equal':114 'exact':126 'financ':72,179 'function':157 'gate':3,17,151 'http':94 'id':191 'infer':71 'infrastructur':76,181 'json-response' 'key':143 'land':170 'like':174 'limit':146 'list':172 'live':87 'lowpaymentfee API' 'lowpaymentfee.com':32 'made':123 'materi':166 'may':195 'mention':185 'micropay':154 'ml':178 'network':112 'offer':58 'page':171,211 'part':52 'pay':9,23,63 'pay-per-cal':62 'pay-per-call API' 'pay-per-request' 'payment':48,97,121 'payto':131 'per':11,25,64,82 'platform':56 'post':136 'premium':34 'price':79 'prompt':220 'protocol':49 'provid':33 'pure':152 'rate':145 'record':205 'relat':41,200 'request':12,26,83,137 'requir':96 'resourc':42,190 'return':89,139,196,215 'scheme':127 'site':168 'span':67 'specif':43,156,203 'specifi':130 'specul':209 'suggest':193 'unit':104 'usd':116 'usdc':14,28,106,117 'usdc-micropayment' 'use':118 'util':77 'valid':91 'varieti':60 'via':45,124 'wallet':219 'web3':73 'x402':2,16,47,92 'x402 email endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"edd26343-29f4-48db-94cd-5b02fa07d802","listingId":"5751db2c-3ac0-42ba-b2ac-d6599b59cd79","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.464Z"}],"sources":[{"listingId":"5751db2c-3ac0-42ba-b2ac-d6599b59cd79","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.464Z","lastSeenAt":"2026-04-25T16:04:18.679Z"}],"details":{"listingId":"5751db2c-3ac0-42ba-b2ac-d6599b59cd79","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/62 \\\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/62"},{"claim":"The 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":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/62"}],"useCases":["Retrieving email-related data on a per-request payment basis without API keys","Agent-driven workflows that need to purchase data access programmatically via x402","Integrating low-cost micropayment-gated data into automated pipelines"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Use cases requiring USDC micropayments on Base L2","Scenarios where no subscription or rate-limit management is desired"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume bulk email operations where per-request pricing is inefficient","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.671Z"},"updatedAt":"2026-04-25T16:04:18.679Z"}}