{"id":"2e0ea81b-ad27-4f15-a322-6acf0b742982","shortId":"P3sxTV","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/products/11` is listed as \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, accepting payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises endpoints in four categories: 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual functionality, request/response schemas, and data sources behind these endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","general"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content.","The purpose and functionality of /api/v1/products/11 ('Premium API Access') is not described anywhere; it does not match any of the named endpoints on the landing page.","No request or response schema is provided; callers cannot know what to send or what to expect back.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/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/v1/products/11","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 the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and every documentation page is empty. The actual functionality behind 'Premium API Access' at /api/v1/products/11 is completely 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'/request':13,28 '0.02':12,27,121,185 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':115 '300':138 '6':124 'Base network API' 'USDC API' 'accept':91,102 'access':89 'actual':206 'address':134 'advertis':144 'ai':156 'ai/ml':48 'amount':113 'analysi':160 'analyt':47,150 'api':5,20,37,70,88 'base':8,23,66,109,117 'behind':213 'beyond':190 'broader':142 'call':4,19 'categori':148 'challeng':96 'classif':163 'confirm':97 'connect':202 'contract':106 'convers':179 'data':46,51,149,153,211 'decim':125 'doc/pricing/api':198 'document':189 'embed':164 'empti':196 'enabl':36 'endpoint':44,56,81,99,145,215 'equal':120 'essenti':195 'estim':174 'exact':131 'exchang':169 'export':154 'feed':168 'financ':165 'finance/web3':50 'four':147 'function':207 'gas':173 'generat':180 'geocod':177 'howev':188 'infer':49 'infrastructur':176 'insight':155 'json-response' 'key':71 'land':192 'learn':158 'limit':74 'list':85 'live':101 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':157 'made':128 'marketplac':38 'max':112 'metric':151 'micropayment API' 'network':9,24,67 'no-api-key' 'offer':40 'page':193,199 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':58 'payment':103,126 'per':3,18,60,186 'platform':6,21,143 'post':92 'post-endpoint' 'premium':87 'price':167,183 'quot':172 'rate':73,170 'report':152 'request':61,93,187 'request/response':208 'requir':78 'schema':209 'scheme':132 'second':139 'sentiment':159 'servic':54 'show':201 'sourc':212 'span':45 'specif':80 'subscript':77 'summar':162 'text':161 'timeout':140 'token':171 'unit':118 'unknown':217 'usdc':15,30,63,105,122 'usdc-base' 'use':62,123 'util':53 'valid':178 'varieti':42 'via':10,25,129 'wallet':203 'web3':166 'x402':11,26,35,95 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2a1693b8-971e-483b-8735-59c2c4236ced","listingId":"2e0ea81b-ad27-4f15-a322-6acf0b742982","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/products/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":"2026-04-18T18:38:33.994Z"}],"sources":[{"listingId":"2e0ea81b-ad27-4f15-a322-6acf0b742982","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:33.994Z","lastSeenAt":"2026-04-22T10:31:12.115Z"}],"details":{"listingId":"2e0ea81b-ad27-4f15-a322-6acf0b742982","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/11 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to access.","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 in USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/products/11"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/11"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven API consumption with per-request crypto payments"],"bestFor":["Developers who want zero-friction API access without sign-up","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use over monthly subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.474Z"},"updatedAt":"2026-04-22T10:31:12.115Z"}}