{"id":"4a3fe7df-5c3a-4038-a8bb-944a6dd686b6","shortId":"4spMB4","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/accounts/28` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet `0x1A2B...85F3` on Base. The asset contract `0x8335...2913` is the canonical USDC contract on Base. The endpoint returns `application/json` responses.\n\nHowever, the specific functionality of `/api/v1/accounts/28` is unclear — it does not match any of the documented API paths listed on the site's landing page (which cover analytics, AI, finance, and utility endpoints). No OpenAPI schema, detailed documentation, or example request/response payloads are available. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. This makes it difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API access","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The endpoint path /api/v1/accounts/28 does not match any documented API on the site's landing page — its specific functionality is unknown.","No OpenAPI schema, request/response examples, or detailed documentation available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The purpose of this specific endpoint (accounts/28) cannot be determined from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/28","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/accounts/28","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 pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/accounts/28 has no documentation, no schema, no example payloads, and its purpose is undocumented. All doc pages return only 'Connect wallet' with no content. This is effectively a stub 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'/request':13,28 '0.02':12,27,75,120 '000':115 '0x1a2b':129 '0x8335':136 '20':114 '2913':137 '6':125 '85f3':130 'Base network API' 'USDC API' 'accept':105 'access':7,22,38 'addit':210 'ai':61,178 'analyt':60,177 'api':6,21,37,87,166,197 'application/json':148 'asset':134 'avail':193 'base':9,24,83,116,132,144 'call':4,19 'canon':140 'categori':69 'challeng':99 'commit':95 'confirm':100 'connect':205 'content':211 'contract':135,142 'cover':176 'data':59,219 'decim':126 'detail':186 'determin':217 'difficult':215 'doc':195 'document':165,187 'endpoint':32,52,71,102,146,182,224 'exampl':189 'financ':64,179 'function':153 'howev':150 'infrastructur':67 'json-response' 'key':88 'land':173 'learn':63 'limit':91 'list':168 'live':104 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':62 'make':213 'mani':51 'match':161 'micropayment API' 'minimum':94 'network':84 'no-api-key' 'offer':53 'one':49 'openapi':184 'page':174,200 'paid API access' 'particular':223 'path':167 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payload':191 'payment':42,110 'per':3,18,76 'platform':56 'post':106 'post-method' 'premium':5,20,36 'premium API' 'price':73,196 'prompt':207 'protocol':43 'provid':35 'rate':90 'readm':199 'render':202 'request':77,107 'request/response':190 'requir':96,109 'resourc':46 'respons':149 'return':147,225 'schema':185 'servic':221 'settl':78 'sinc':122 'site':171 'span':58 'specif':45,152 'unclear':157 'unit':117 'usd':121 'usdc':15,30,80,119,123,141 'usdc-base' 'use':124 'util':68,181 'via':10,25,39 'wallet':128,206 'web3':65 'x402':11,26,41,98 'x402 endpoint' 'x402-payment'","prices":[{"id":"5612ce48-6228-409d-b67e-fb260065107c","listingId":"4a3fe7df-5c3a-4038-a8bb-944a6dd686b6","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/accounts/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:27.526Z"}],"sources":[{"listingId":"4a3fe7df-5c3a-4038-a8bb-944a6dd686b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:27.526Z","lastSeenAt":"2026-04-22T18:03:33.869Z"}],"details":{"listingId":"4a3fe7df-5c3a-4038-a8bb-944a6dd686b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/28 \\\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 up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/28"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/28"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or account information via a single pay-per-call request","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges on Base"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents that can settle USDC payments on Base automatically","Use cases needing keyless, rate-limit-free API access"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone needing non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.868Z"},"updatedAt":"2026-04-22T18:03:33.869Z"}}