{"id":"934b113a-aeb9-4f5e-a784-1a6f34e1f745","shortId":"dSnjYe","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site advertises a broad suite of APIs spanning data & analytics, 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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/resource/11` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what `/api/resource/11` actually returns. The site's landing page lists many API paths but none match the `/api/resource/11` pattern, making it unclear what this specific resource provides. Prospective callers should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","post-method"],"categories":["api","crypto-payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /pricing, /README all render only 'Connect wallet' with no content.","The endpoint path /api/resource/11 does not match any of the advertised API routes listed on the homepage.","No request or response schema is documented; callers cannot know what data to send or expect back.","Functionality behind this specific endpoint is entirely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/resource/11","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/resource/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/resource/11 actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The specific resource path doesn't match any of the advertised API routes on the landing 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'/api/resource/11':112,203,219 '/docs':172 '/pricing':174 '/readme':176 '0.02':12,28,88,140 '000':130 '0x8335':135 '20':129 '6':144 'Base network API' 'USDC micropayment API' 'accept':161 'access':7,23,40,118 'actual':204,236 'address':158 'advertis':48 'ai':57 'analysi':61 'analyt':56 'api':6,22,39,53,100,117,213 'application/json':166 'awar':233 'base':9,25,96,131,137 'behind':238 'broad':50 'call':4,20 'caller':230 'challeng':124 'classif':64 'commit':107 'connect':182 'content':188 'convers':81 'crypto-paid endpoint' 'data':55 'decim':145 'document':167,197 'embed':65 'endpoint':34,84,111,160,240 'equal':139 'estim':75 'exact':152 'exampl':200 'exchang':70 'extrem':169 'feed':69 'financ':66 'function':237 'gas':74 'generat':82 'geocod':79 'given':141 'infrastructur':77 'json-response' 'key':101 'land':209 'learn':59 'limit':104 'list':114,211 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':58 'made':148 'make':221 'mani':212 'match':217 'maxamountrequir':127 'network':97 'no-api-key' 'none':216 'openapi':192 'page':177,210 'path':214 'pattern':220 'pay':2,18 'pay-per-cal':1,17 'pay-per-call' 'pay-per-request API' 'payabl':91 'payment':44,146 'payto':157 'per':3,13,19,29,89 'post':162 'post-method' 'premium':5,21,38,116 'premium API access' 'price':68,86 'prompt':184 'prospect':229 'protocol':45 'provid':37,228 'quot':73 'rate':71,103 'render':179 'request':14,30,90,163 'request/response':195 'requir':108 'resourc':227 'return':120,165,205 'schema':196 'scheme':153 'sentiment':60 'site':47,207 'span':54 'spars':170 'spec':193 'specif':110,226 'specifi':156 'suit':51 'summar':63 'text':62 'token':72 'unclear':223 'undocu':242 'unit':132 'usdc':16,32,93,134,142 'usdc-base' 'util':78 'valid':80,122 'via':10,26,41,149 'wallet':183 'web3':67 'x402':11,27,43,123,151 'x402 API' 'x402-payment'","prices":[{"id":"6c9616dd-1ba2-44b0-b0d4-25cb2a7e2cbe","listingId":"934b113a-aeb9-4f5e-a784-1a6f34e1f745","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/resource/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:53.244Z"}],"sources":[{"listingId":"934b113a-aeb9-4f5e-a784-1a6f34e1f745","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:53.244Z","lastSeenAt":"2026-04-22T05:30:29.842Z"}],"details":{"listingId":"934b113a-aeb9-4f5e-a784-1a6f34e1f745","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/resource/11\n# 2. Parse the 402 response, construct an X-PAYMENT header\n#    with a signed USDC payment of 20000 base units ($0.02)\n#    on Base to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3\n# 3. Resend the POST with the X-PAYMENT header attached.","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 API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/resource/11"},{"claim":"Site lists APIs for data & analytics, AI & ML, finance & Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a paid API resource without traditional API key registration","Making micropayment-gated API calls settled in USDC on Base","Agent-driven programmatic access to premium content or data"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented API contracts with clear request/response schemas","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":"2026-02-27T18:18:06.626Z"},"updatedAt":"2026-04-22T05:30:29.842Z"}}