{"id":"de5c272e-ad48-4135-ac4d-1c46612d217c","shortId":"GKfrWE","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/products/98` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 uniformly priced at $0.02 per request.\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 schema, no request/response examples, and no description of what the `/api/v1/products/98` endpoint actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond its name.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose of /api/v1/products/98 ('Premium API Access') is undefined — unclear what data it returns","The broad catalog of endpoints (AI, analytics, finance, utils) is listed but none have documented schemas or examples","Cannot verify that any of the advertised endpoints actually deliver real data behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of '/api/v1/products/98' is entirely opaque — 'Premium API Access' is not descriptive. This is effectively a stub 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'/request':16,32 '0.02':15,31,91,163 '000':81 '0x8335':69 '20':80 '2913':70 '402':212 '402 payment API' '6':86 'Base network API' 'USDC micropayment API' 'accept':64 'access':62,230 'across':121 'actual':204 'advertis':76 'ai':9,25,131 'ai-inference' 'analysi':135 'analyt':8,24,125 'api':4,20,42,61,95,172,229 'attach':104 'base':7,23,51,72,82 'beyond':232 'broader':117 'call':41 'caller':102 'categori':123 'challeng':75,217 'classif':138 'collect':36 'confirm':209 'connect':181 'content':187 'contract':68 'convers':155 'data':124,128,225 'data-analytics' 'decim':87 'descript':198 'doc':171 'document':166,220 'embed':139 'endpoint':13,29,43,55,120,158,203,207 'equal':90 'estim':149 'exampl':195 'exchang':144 'export':129 'extrem':168 'feed':143 'financ':10,26,140 'finance-data' 'four':122 'function':227 'gas':148 'gate':3,19,44 'generat':156 'geocod':153 'header':109 'host':34 'infrastructur':151 'insight':130 'key':96 'learn':133 'limit':99 'list':58 'live':210 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':132 'maxamountrequir':78 'metric':126 'name':234 'network':52 'no-api-key' 'no-rate-limit' 'offer':119 'openapi':191 'page':176 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payment':65,108,114 'per':40,92,164 'platform':118 'premium':60,228 'price':142,161,173 'prompt':183 'proof':115 'protocol':48 'provid':231 'quot':147 'rate':98,145 'readm':175 'render':178 'report':127 'request':93,165 'request/response':194 'requir':101 'return':205,211 'schema':192 'sentiment':134 'simpli':103 'spars':169 'specif':54 'suit':5,21 'summar':137 'text':136 'token':146 'unclear':223 'uniform':160 'unit':83 'usdc':67,89 'usdc-base' 'util':12,28,152 'utility-services' 'valid':112,154,215 'wallet':182 'web3':141 'without':219 'x':107 'x-payment':106 'x402':2,18,47,74,113,216 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"93153dd4-97d6-4099-aa3f-d5cf03ebb243","listingId":"de5c272e-ad48-4135-ac4d-1c46612d217c","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:39.216Z"}],"sources":[{"listingId":"de5c272e-ad48-4135-ac4d-1c46612d217c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:39.216Z","lastSeenAt":"2026-04-22T05:30:29.202Z"}],"details":{"listingId":"de5c272e-ad48-4135-ac4d-1c46612d217c","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Using curl to probe the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/98\n# Returns 402 with x402 payment challenge.\n# Attach a valid X-PAYMENT header (built by an x402 client) to complete the call.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/98"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/98"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without signup or API key management","Micropayment-gated data retrieval for analytics or finance workflows","AI inference calls (sentiment, summarization, classification) paid per request","Utility operations like geocoding or data conversion with instant crypto settlement"],"bestFor":["Developers or agents wanting zero-friction, keyless API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty usage patterns where per-call pricing is economical"],"notFor":["High-volume production workloads where per-call costs add up quickly","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:33:23.591Z"},"updatedAt":"2026-04-22T05:30:29.202Z"}}