{"id":"79b2ac68-1ac3-45d7-a5c3-37805e01c40f","shortId":"FEPw7q","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/21`) 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 listed at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific `/api/v1/emails/21` endpoint is not listed on the homepage's catalog, and no documentation or schema details are available for it beyond the x402 challenge metadata.\n\nThe endpoint accepts POST requests and returns `application/json`. No OpenAPI spec, detailed input/output schema, or usage examples were found in the crawl. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no substantive content. The exact nature of the data returned by this email endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-response","post-method"],"categories":["data","email"],"synonyms":["email API","premium email access","x402 email endpoint","pay-per-call email","lowpaymentfee email","USDC email API","Base network API"],"warnings":["The /api/v1/emails/21 endpoint is not listed in the provider's public API catalog on the homepage","No documentation, OpenAPI spec, or response schema is available for this endpoint","All doc/pricing/API pages returned only a 'Connect wallet' prompt with no content","The exact nature of the data returned (email content, metadata, etc.) is completely unclear","Cannot verify what data is actually served after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/21","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the specific email endpoint is not even listed on the provider's homepage. The docs/pricing/API pages are all empty beyond a wallet connect prompt. The purpose and response format of /api/v1/emails/21 are 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'0.02':10,24,72,134 '000':74 '20':73 '402':57 '6':80 'Base network API' 'USDC email API' 'accept':178 'access':36 'address':87 'advertis':92 'ai':104 'analysi':108 'analyt':103 'api':35,100,139,202 'application/json':183 'avail':168,229 'base':8,22,65,75 'beyond':171 'broader':89 'catalog':160 'challeng':58,174 'classif':110 'commit':146 'connect':208 'content':214 'convers':127 'cost':68 'crawl':197 'data':5,19,102,220 'decim':81 'detail':166,187 'doc':199 'document':163 'email':4,18,40,224 'email API' 'email-data' 'email-rel':39 'embed':111 'endpoint':6,20,30,51,130,152,177,225 'estim':121 'exact':216 'exampl':192 'exchang':116 'feed':115 'financ':112 'found':194 'gas':120 'gate':3,17 'generat':128 'geocod':125 'homepag':158 'howev':148 'infrastructur':123 'input/output':188 'json-response' 'key':140 'learn':106 'limit':143 'list':132,155 'live':53 'lowpaymentfee email' 'lowpaymentfee.com':32,90 'machin':105 'materi':230 'metadata':175 'natur':217 'network':66 'openapi':185 'page':203 'pay':9,23,97 'pay-per-call email' 'pay-per-request':96 'payment':48,60 'per':11,25,69,98,135 'platform':91 'post':179 'post-method' 'premium':34 'premium email access' 'price':114,200 'prompt':210 'protocol':49 'provid':33 'quot':119 'rate':117,142 'relat':41 'render':205 'request':12,26,70,99,136,180 'requir':59,147 'resourc':42 'return':55,182,221 'schema':165,189 'sentiment':107 'settl':82 'span':101 'spec':186 'specif':43,150 'specifi':85 'substant':213 'suit':94 'summar':109 'token':118 'unclear':227 'unit':76 'usag':191 'usdc':14,28,62,78 'usdc-base' 'util':124 'valid':126 'via':45 'wallet':86,209 'web3':113 'x402':2,16,47,173 'x402 email endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bd1e7aca-9d79-41e5-8f45-6bc0d0fa409e","listingId":"79b2ac68-1ac3-45d7-a5c3-37805e01c40f","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.004Z"}],"sources":[{"listingId":"79b2ac68-1ac3-45d7-a5c3-37805e01c40f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.004Z","lastSeenAt":"2026-04-22T10:02:44.754Z"}],"details":{"listingId":"79b2ac68-1ac3-45d7-a5c3-37805e01c40f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/21 \\\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 network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/21"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/21"},{"claim":"The docs, pricing, and API pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis without API keys","Agent-driven workflows that need to fetch email content or metadata with micropayments","Integrating pay-as-you-go email data access into automated pipelines"],"bestFor":["Developers wanting keyless, pay-per-request email data access","AI agents that can settle x402 payments in USDC on Base","Use cases requiring low-friction, no-commitment API access"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume email processing where per-request pricing is cost-prohibitive","Anyone who needs to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.491Z"},"updatedAt":"2026-04-22T10:02:44.754Z"}}