{"id":"865bbedd-3cd0-464f-bbbf-9d9c14c3f1d4","shortId":"Wy2EDv","kind":"x402","title":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request email-related API accessible via the x402 payment protocol. The specific resource path `/api/v1/emails/25` suggests an email data retrieval or email-sending endpoint, though the exact functionality is not documented beyond the generic \"Premium API Access\" label. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider operates a broader platform offering multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. The x402 challenge is live and returns a well-formed 402 response with scheme \"exact\" on Base. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each POST request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/25` endpoint actually returns or expects as input. The endpoint is live but its exact behavior must be discovered empirically.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","email-api","no-api-key","post-method"],"categories":["email","infrastructure"],"synonyms":["email API","pay-per-call email","x402 email endpoint","USDC email API","Base network API","micropayment email","lowpaymentfee email"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","Exact functionality of /api/v1/emails/25 is unknown; 'Premium API Access' is the only description","No OpenAPI schema or request/response examples provided","No information on what input the POST body should contain","The '/25' path segment is unexplained — could be an email ID, a batch size, or something else"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no documentation, no OpenAPI schema, no request/response examples, and no clear description of what the emails/25 endpoint does. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/call':12,30 '0.02':11,29,96,131 '000':100 '20':99 '402':145 '6':104 'Base network API' 'USDC email API' 'access':51,84 'actual':211 'ai':119 'analyt':118 'api':6,16,24,34,50,83,114,153,179 'attach':164 'base':8,26,93,101,151 'base-network' 'behavior':224 'beyond':79 'broader':110 'caller':162 'categori':115 'challeng':136 'commit':159 'connect':188 'content':194 'data':65,117 'decim':105 'descript':205 'discov':227 'doc':178 'document':78,173 'email':5,23,48,64,69 'email API' 'email-api' 'email-rel':47 'email-send':68 'empir':228 'endpoint':38,71,210,218 'exact':74,149,223 'exampl':202 'expect':214 'extrem':175 'financ':122 'form':144 'function':75 'generic':81 'header':168 'includ':116 'infrastructur':125 'input':216 'key':17,35,154 'label':85 'learn':121 'limit':156 'live':138,220 'lowpaymentfee email' 'lowpaymentfee.com':40 'machin':120 'micropayment email' 'multipl':113 'must':225 'network':94 'no-api-key' 'offer':112 'openapi':198 'oper':108 'page':183 'path':60 'pay':2,20,44 'pay-per-call email' 'pay-per-request':1,19,43 'payment':55,86,167 'per':3,21,45,97,132 'platform':111 'post':171 'post-method' 'premium':82 'price':128,180 'prompt':190 'protocol':56 'provid':41,107 'rate':155 'readm':182 'relat':49 'render':185 'request':4,22,46,98,133,172 'request/response':201 'requir':18,36,161 'resourc':59 'respons':146 'retriev':66 'return':140,212 'schema':199 'scheme':148 'send':70 'settl':88 'simpli':163 'spars':176 'specif':58 'substant':193 'suggest':62 'though':72 'uniform':129 'unit':102 'upfront':158 'usdc':14,32,90 'usdc-settlement' 'util':126 'via':9,27,52 'wallet':189 'web3':123 'well':143 'well-form':142 'x402':10,28,54,135,166 'x402 email endpoint' 'x402-payment'","prices":[{"id":"e93cfd3f-f3a0-4130-8900-7442ab256c74","listingId":"865bbedd-3cd0-464f-bbbf-9d9c14c3f1d4","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.827Z"}],"sources":[{"listingId":"865bbedd-3cd0-464f-bbbf-9d9c14c3f1d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.827Z","lastSeenAt":"2026-04-22T12:05:01.399Z"}],"details":{"listingId":"865bbedd-3cd0-464f-bbbf-9d9c14c3f1d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/25 \\\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 live 402 challenge with x402Version 1, scheme 'exact', on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/25"},{"claim":"Payment asset is USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/emails/25"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email data or metadata via a single paid API call","Integrating email functionality into agent workflows without managing API keys","Making one-off email API requests settled instantly in USDC on Base"],"bestFor":["Agents needing keyless, pay-as-you-go email API access","Developers who want to avoid subscription commitments for occasional email calls","x402-compatible wallets and agent frameworks on Base"],"notFor":["High-volume email sending requiring bulk pricing or rate guarantees","Users who need detailed API documentation or SLA commitments before integrating","Non-crypto users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.72Z"},"updatedAt":"2026-04-22T12:05:01.399Z"}}