{"id":"a8291eaf-8d33-4c8c-8dc1-45d6c82f7425","shortId":"mXhAFu","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/59` is described as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the \"Premium API Access\" endpoint actually returns. It is unclear whether this specific endpoint generates API keys, provides access tokens, or serves some other function. The site's landing page lists the broader API catalog but does not document individual endpoint schemas or parameters.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-generation","json-response"],"categories":["infrastructure","api-access"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API key","crypto API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific function of /api/v1/apikeys/59 is undocumented — it may generate API keys or serve another purpose","No examples of request bodies or successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/59","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/apikeys/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The purpose of this specific endpoint (apikeys/59) is unclear beyond the label 'Premium API Access'. Effectively a stub 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'0.02':9,22,92,139 '000':123 '0x8335':128 '20':122 '2913':129 '6':135 'Base network API' 'USDC micropayment API' 'accept':161 'access':3,16,34,111,205,220 'actual':207 'addit':187 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,110,151,174,204,217,235 'api-key-generation' 'application/json':166 'base':8,21,100,124,131 'broad':45 'broader':234 'call':51,141 'catalog':46,236 'challeng':117 'classif':68 'connect':182 'content':188 'convers':85 'crypto API access' 'data':54,58 'decim':136 'describ':107 'descript':199 'doc':172 'document':167,240 'embed':69 'endpoint':28,88,104,160,206,215,242 'equal':138 'estim':79 'exact':148 'exampl':196 'exchang':74 'export':59 'extrem':169 'feed':73 'financ':70 'function':226 'gas':78 'gate':35 'generat':86,216 'geocod':83 'host':43 'individu':241 'infrastructur':81 'insight':60 'json-response' 'key':152,218 'land':230 'learn':63 'limit':156 'list':232 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':144 'maxamountrequir':120 'metric':56 'micropay':6,19 'micropayment' 'network':101 'openapi':192 'page':177,231 'paramet':245 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,142 'per':10,23,50,93,140 'post':162 'premium':1,14,32,109,203 'premium API key' 'price':72,90,173 'prompt':184 'protocol':40 'provid':31,219 'quot':77 'rate':75,155 'readm':176 'render':179 'report':57 'request':11,24,94,163 'request/response':195 'requir':158 'return':113,165,208 'schema':193,243 'scheme':149 'sentiment':64 'serv':223 'settl':95 'sinc':132 'site':42,228 'span':53 'spars':170 'specif':103,214 'subscript':153 'summar':67 'text':66 'token':76,221 'unclear':211 'unit':125 'usdc':13,26,97,127,133 'usdc-base' 'use':134 'util':82 'valid':84,115 'via':4,17,145 'wallet':183 'web3':71 'whether':212 'x402':5,18,38,116,147 'x402 API' 'x402-payment'","prices":[{"id":"9a510066-7478-445b-bf84-eefe89abdba4","listingId":"a8291eaf-8d33-4c8c-8dc1-45d6c82f7425","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/apikeys/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:42.130Z"}],"sources":[{"listingId":"a8291eaf-8d33-4c8c-8dc1-45d6c82f7425","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:42.130Z","lastSeenAt":"2026-04-23T05:01:55.013Z"}],"details":{"listingId":"a8291eaf-8d33-4c8c-8dc1-45d6c82f7425","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/59 \\\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":"All endpoints priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/apikeys/59"},{"claim":"Site advertises no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"API catalog includes data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring premium API access or keys via a single micropayment","Agent-driven pay-per-call API consumption without subscriptions","Programmatic access to a multi-category API catalog (AI, finance, data, utilities)"],"bestFor":["AI agents needing keyless, pay-per-request API access","Developers who want to avoid API key management and subscriptions","Low-volume or bursty workloads where per-call pricing is economical"],"notFor":["High-volume production workloads needing guaranteed SLAs and documentation","Users who need detailed API schemas and response documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.535Z"},"updatedAt":"2026-04-23T05:01:55.013Z"}}