{"id":"03e03a90-d07f-462b-bd98-f8dafa6da6b9","shortId":"bFv3hb","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/35`) 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). Payment is made via the x402 \"exact\" scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a range of pay-per-request API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per call. However, the specific `/api/v1/emails/35` endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes what data or functionality it returns. The endpoint accepts POST requests and returns `application/json`. Beyond that, the request body schema, response schema, and the meaning of the path parameter `35` are undocumented.\n\nBecause the crawled docs pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, there is essentially no documentation available for this or any other endpoint on the platform. Users should treat this as an exploratory, minimally-documented service.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-api","no-api-key"],"categories":["data"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The /api/v1/emails/35 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.","All documentation pages (/docs, /api, /pricing, /README) returned no content beyond a 'Connect wallet' prompt.","No request or response schema is available; the meaning of the path parameter '35' is unknown.","The broader platform lists many API categories but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/35","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/35","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 zero documentation on what the endpoint does, what request body it expects, or what it returns. The /emails/35 path is not listed among the site's advertised APIs. Docs pages are empty. This is effectively a stub 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'/api/v1/emails/35':44,137 '/docs':193 '/pricing':195 '/readme':196 '0.02':10,24,72,131 '000':74 '20':73 '35':185 '402':57 '6':80 'Base network API' 'USDC API' 'accept':164 'access':36 'address':94 'advertis':107,150 'ai':120 'among':148 'analyt':119 'api':35,97,115,151 'application/json':169 'avail':213 'base':8,22,65,75 'beyond':170 'bodi':174 'broader':104 'call':133 'categori':116 'challeng':58 'connect':201 'content':207 'cost':68 'crawl':190 'data':5,19,118,157 'decim':81 'describ':155 'doc':191 'document':154,212,232 'email':4,18,40 'email API' 'email-data' 'email-rel':39 'endpoint':6,20,30,51,138,163,219 'essenti':210 'exact':88 'exploratori':229 'financ':123 'function':159 'gate':3,17 'howev':134 'includ':117 'infrastructur':126 'json-api' 'key':98 'land':146 'learn':122 'limit':101 'list':141 'live':53 'lowpaymentfee' 'lowpaymentfee.com':32,105 'machin':121 'made':84 'mean':180 'micropayment API' 'minim':231 'minimally-docu':230 'network':66 'no-api-key' 'page':147,192 'paid email endpoint' 'paramet':184 'path':183 'pay':9,23,112 'pay-per-request':111 'payment':48,60,82 'per':11,25,69,113,132 'platform':106,222 'post':165 'premium':34 'price':129 'prompt':203 'protocol':49 'provid':33 'rang':109 'rate':100 'relat':41 'request':12,26,70,114,166,173 'requir':59,102 'resourc':42 'respons':176 'return':55,161,168,198 'schema':175,177 'scheme':89 'servic':233 'site':144 'specif':43,136 'specifi':92 'substant':206 'treat':225 'undocu':187 'unit':76 'usdc':14,28,62,78 'usdc-base' 'user':223 'util':127 'via':45,85 'wallet':93,202 'web3':124 'x402':2,16,47,87 'x402 email' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9d66c9f0-4987-4089-8d0d-d41bb29145bc","listingId":"03e03a90-d07f-462b-bd98-f8dafa6da6b9","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.103Z"}],"sources":[{"listingId":"03e03a90-d07f-462b-bd98-f8dafa6da6b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.103Z","lastSeenAt":"2026-04-25T17:33:18.981Z"}],"details":{"listingId":"03e03a90-d07f-462b-bd98-f8dafa6da6b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/35 \\\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 requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/emails/35"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive 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 content gated by x402 micropayments"],"bestFor":["Agents or scripts that can handle x402 payment flows","Users who want keyless, pay-as-you-go API access","Developers experimenting with x402 protocol integrations"],"notFor":["Users who need documented request/response schemas before integrating","High-volume use cases where per-request pricing may add up","Anyone needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.367Z"},"updatedAt":"2026-04-25T17:33:18.981Z"}}