{"id":"8984f650-2b91-42b9-8fa4-f3aaa3bae61d","shortId":"HpbQP6","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/policies/71` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/policies/71` endpoint actually returns. The landing page lists many endpoints but provides no technical documentation for any of them.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.","No OpenAPI or schema available; request and response formats are unknown.","The specific purpose of /api/v1/policies/71 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No robots.txt or agents.txt present."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/71","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/policies/71","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/policies/71 endpoint is unclear beyond the generic 'Premium API Access' 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'/call':19,38 '0.02':18,37,99,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':150 '402':123 '402 payment api' 'access':119 'across':58 'actual':212 'advertis':160 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,154,179 'attach':163 'base':8,27,107,130,137 'base usdc api' 'broad':50 'caller':161 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'connect':188 'content':194 'convers':92 'conversion' 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'descript':206 'detail':205 'doc':178 'document':173,224 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,211,219 'equal':139 'estim':86 'exact':146 'exampl':202 'exchang':81 'export':66 'extrem':175 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'header':168 'infrastructur':88 'insight':67 'key':155 'land':215 'learn':70 'limit':158 'list':115,217 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'mani':218 'metric':63 'micropayment api' 'network':108 'offer':48 'openapi':198 'page':183,216 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':141,167 'per':3,22,55,100 'platform':6,25,46 'post':171 'premium':117 'price':79,97,180 'prompt':190 'provid':221 'quot':84 'rate':82,157 'readm':182 'render':185 'report':64 'request':4,23,56,101,125,172 'request/response':201 'return':121,213 'schema':199 'scheme':147 'second':151 'sentiment':71 'sentiment-analysis' 'simpli':162 'spars':176 'specif':110 'substant':193 'summar':74 'technic':223 'text':73 'text-summarization' 'timeout':152 'token':83 'unit':131 'usdc':104,133 'usdc-base' 'util':15,34,89 'valid':91 'validation' 'via':9,28,143 'wallet':189 'web3':78 'x':166 'x-payment':165 'x402':10,29,43,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7934c49f-7ce4-4ad4-8c6d-0dce107127f7","listingId":"8984f650-2b91-42b9-8fa4-f3aaa3bae61d","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/policies/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:03.256Z"}],"sources":[{"listingId":"8984f650-2b91-42b9-8fa4-f3aaa3bae61d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:03.256Z","lastSeenAt":"2026-04-23T00:32:01.053Z"}],"details":{"listingId":"8984f650-2b91-42b9-8fa4-f3aaa3bae61d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/71 \\\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 402 challenge for /api/v1/policies/71 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/policies/71"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use pricing","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or applications that need low-friction, keyless API access paid per request","Developers prototyping with multiple utility/AI endpoints without upfront costs","Web3-native workflows that can settle USDC payments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.354Z"},"updatedAt":"2026-04-23T00:32:01.053Z"}}