{"id":"d0bf888e-f3ff-43d9-a384-b03576f90456","shortId":"fcDBZM","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/57` 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 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 (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nHowever, the specific functionality behind `/api/v1/accounts/57` is not documented. The platform's landing page lists various API categories (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, etc.), but the `/api/v1/accounts/` path does not appear among them. Without documentation or an OpenAPI schema, the exact input parameters and response structure for this particular endpoint remain unknown.","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","lowpaymentfee","micropayment API","accounts endpoint"],"warnings":["The endpoint path /api/v1/accounts/57 is not listed among the platform's documented APIs — its purpose is unclear","No OpenAPI schema, request parameters, or response format documentation is available","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","The exact functionality behind 'Premium API Access' at this path cannot be verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/57","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/57","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/request in USDC on Base). However, the specific endpoint /api/v1/accounts/57 has no documentation, no OpenAPI schema, no example requests or responses, and does not appear in the platform's listed API catalog. The docs, pricing, API, and README pages all returned only a 'Connect wallet' prompt with no useful 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'/api/v1/accounts/57':47,151 '/request':13,28 '0.02':12,27,75,125 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':119 '20':113 '2913':120 '300':137 '6':123 'Base network API' 'USDC API' 'accept':104 'access':7,22,38 'accounts endpoint' 'address':133 'ai':61 'among':185 'analysi':167 'analyt':60 'api':6,21,37,87,162 'appear':184 'application/json':145 'base':9,24,83,115,122 'behind':150 'call':4,19,127 'categori':69,163 'challeng':98 'classif':169 'commit':94 'confirm':99 'data':59 'decim':124 'document':154,188 'embed':170 'endpoint':32,52,71,101,203 'etc':177 'exact':194 'exchang':173 'feed':172 'financ':64 'function':149 'geocod':175 'howev':146 'infrastructur':67 'input':195 'json-response' 'key':88 'land':158 'learn':63 'limit':91 'list':160 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':62 'mani':51 'metric':164 'micropayment API' 'mime':142 'network':84 'no-api-key' 'offer':53 'one':49 'openapi':191 'page':159 'paid API access' 'paramet':196 'particular':202 'path':181 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':42,109,129 'per':3,18,76,126 'platform':56,156 'post':105 'post-method' 'premium':5,20,36 'premium API' 'price':73,171 'protocol':43 'provid':35 'rate':90,174 'remain':204 'report':165 'request':77,106 'requir':95,108 'resourc':46 'respons':141,198 'schema':192 'second':138 'sent':131 'sentiment':166 'settl':78 'span':58 'specif':45,148 'structur':199 'summar':168 'timeout':139 'type':143 'unit':116 'unknown':205 'usdc':15,30,80,118 'usdc-base' 'util':68 'valid':176 'various':161 'via':10,25,39 'web3':65 'without':187 'x402':11,26,41,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"f3a319d6-d628-4d19-a16a-882257f9028b","listingId":"d0bf888e-f3ff-43d9-a384-b03576f90456","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:51.695Z"}],"sources":[{"listingId":"d0bf888e-f3ff-43d9-a384-b03576f90456","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:51.695Z","lastSeenAt":"2026-04-22T18:03:34.770Z"}],"details":{"listingId":"d0bf888e-f3ff-43d9-a384-b03576f90456","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/57 \\\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":"Platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/57"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API endpoint without needing API key registration","Making programmatic requests settled instantly in USDC on Base","Integrating agent-purchasable endpoints into automated workflows"],"bestFor":["Developers wanting frictionless pay-per-use API access without subscriptions","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.786Z"},"updatedAt":"2026-04-22T18:03:34.770Z"}}