{"id":"c7f55f13-038a-4988-971a-2ad2d8cd577d","shortId":"Cj2V8T","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 offers 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 with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/apikeys/61` is described as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt, suggesting the site is a single-page app with minimal server-rendered documentation.\n\nBecause the endpoint path (`/apikeys/61`) differs from the other listed API paths (analytics, AI, finance, utils), its exact functionality is unclear. It may provision or return an API key, or it may be a generic premium-access gate. Without further documentation or example payloads, agents should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key-required","micropayment"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee","premium API key"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The endpoint path /api/v1/apikeys/61 is not listed among the site's advertised APIs; its exact functionality is unknown","No example request or response payloads could be found or inferred","The site appears to be an SPA with no server-rendered docs, limiting crawl-based discovery"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/61","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/61","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, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response bodies, and the specific endpoint path (/apikeys/61) is not explained anywhere in the crawled content. Effectively a stub with confirmed 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'/apikeys/61':216 '0.02':9,22,92,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':160 '6':148 'Base network API' 'USDC API access' 'access':3,16,34,122,249 'agent':257 'ai':61,225 'analysi':65 'analyt':55,224 'api':2,15,33,52,104,121,186,222,239 'app':205 'application/json':168 'base':8,21,100,134,141 'bodi':177 'broad':45 'call':51 'catalog':46 'challeng':128 'classif':68 'commit':111 'connect':194 'convers':85 'crawl':182 'data':54,58 'decim':149 'describ':118 'detail':172 'differ':217 'doc':184 'document':173,211,253 'embed':69 'endpoint':28,88,115,214 'equal':143 'estim':79 'exact':156,229 'exampl':175,255 'exchang':74 'exploratori':263 'export':59 'feed':73 'financ':70,226 'found':179 'function':230 'gas':78 'gate':35,250 'generat':86 'generic':246 'geocod':83 'given':145 'infrastructur':81 'insight':60 'integr':264 'json-response' 'key':105,240 'learn':63 'limit':108 'list':221 'live':126 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':152 'may':234,243 'metric':56 'micropay':6,19 'micropayment' 'micropayment API' 'mime':165 'minim':207 'network':101 'no-api-key-required' 'offer':43 'openapi':170 'page':189,204 'path':215,223 'pay':49 'pay-per-cal':48 'pay-per-call' 'pay-per-request' 'payload':256 'payment':39,150 'per':10,23,50,93 'premium':1,14,32,120,248 'premium API key' 'premium-access':247 'price':72,90,185 'prompt':196 'protocol':40 'provid':31 'provis':235 'quot':77 'rate':75,107 'readm':188 'render':191,210 'report':57 'request':11,24,94,129 'request/response':176 'requir':112 'respons':164 'return':124,237 'schema':171 'scheme':157 'second':161 'sentiment':64 'server':209 'server-rend':208 'settl':95 'singl':203 'single-pag':202 'site':42,199 'span':53 'specif':114 'suggest':197 'summar':67 'text':66 'timeout':162 'token':76 'treat':259 'type':166 'unclear':232 'unit':135 'usdc':13,26,97,137,146 'usdc-base' 'util':82,227 'valid':84 'via':4,17,153 'wallet':195 'web3':71 'without':251 'x402':5,18,38,127,155 'x402 API' 'x402-payment'","prices":[{"id":"a07de81e-cfa2-43ce-b771-df42cc321cf7","listingId":"c7f55f13-038a-4988-971a-2ad2d8cd577d","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:35.575Z"}],"sources":[{"listingId":"c7f55f13-038a-4988-971a-2ad2d8cd577d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:35.575Z","lastSeenAt":"2026-04-22T09:01:54.366Z"}],"details":{"listingId":"c7f55f13-038a-4988-971a-2ad2d8cd577d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/61 \\\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 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 x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/61"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API endpoints without traditional API key management","Agent-driven pay-per-call consumption of data, AI, finance, or utility APIs","Integrating x402 micropayments into automated workflows on Base"],"bestFor":["AI agents that need on-demand API access without subscription commitments","Developers exploring x402 payment-gated API patterns","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.867Z"},"updatedAt":"2026-04-22T09:01:54.366Z"}}