{"id":"0222468c-8236-4f86-a806-93bf5da206ff","shortId":"SjsGwE","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/generate/resource/85` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four endpoint 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, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body this particular resource expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found; request and response formats for this endpoint are unknown.","The specific purpose of '/api/v1/generate/resource/85' (labeled 'Premium API Access') is unclear and does not map to any of the named endpoints on the homepage.","Platform appears to be a generic API storefront; quality and reliability of underlying services cannot be verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/85","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/generate/resource/85","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 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of 'resource/85' is entirely opaque. The listing is effectively a 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'/api/v1/generate/resource/85':67 '/docs':174 '/pricing':175 '/readme':178 '/request':17,34 '0.02':16,33,78,166 '000':82 '20':81 '402':214 '402 payment api' '6':88 'access':45,73 'account':101 'advertis':123 'ai':10,27,134 'ai-inference' 'analysi':138 'analyt':128 'api':4,21,41,72,99 'attach':109 'avail':205 'base':7,24,61,83 'base usdc api' 'behind':51 'bodi':225 'broader':121 'call':80 'caller':107 'categori':126 'challeng':216 'classif':141 'classification' 'confirm':209 'connect':184 'convers':158 'cost':75 'data':9,26,127,131 'data-analytics' 'decim':89 'detail':191 'document':169,200,219 'embed':142 'embeddings' 'endpoint':14,31,50,65,125,161,207 'estim':152 'exact':96 'exampl':203 'exchang':147 'expect':229 'export':132 'extrem':171 'feed':146 'financ':11,28,143 'finance-data' 'four':124 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'geocoding' 'handl':92 'header':114 'infrastructur':154 'insight':133 'key':100 'learn':136 'limit':104 'list':69 'live':210 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'marketplac':42 'metric':129 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':179 'particular':227 'pay-per-call api' 'payload':204 'payment':90,113,118 'per':53,79,167 'per-request':52 'per-request-micropayment' 'platform':5,22,122 'premium':71 'price':145,164 'prompt':186 'proof':119 'proper':213 'protocol':40 'quot':150 'rate':103,148 'render':181 'report':130 'request':54,168,224 'request/response':198 'requir':106 'resourc':228 'respons':232 'return':211,234 'schema':199 'scheme':97 'sentiment':137 'sentiment-analysis' 'settl':56 'simpli':108 'spars':172 'spec':196 'specif':64 'summar':140 'technic':190 'text':139 'text-summarization' 'token':149 'unclear':222 'uniform':163 'unit':84 'usdc':58,86 'usdc-base' 'util':13,30,155 'utility-apis' 'valid':117,157 'varieti':48 'via':93 'wallet':185 'web3':144 'without':218 'x':112 'x-payment':111 'x402':2,19,39,95,215 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"05580f29-7824-40a2-93e2-6819d0294735","listingId":"0222468c-8236-4f86-a806-93bf5da206ff","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/generate/resource/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:09.445Z"}],"sources":[{"listingId":"0222468c-8236-4f86-a806-93bf5da206ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:09.445Z","lastSeenAt":"2026-04-23T16:30:38.794Z"}],"details":{"listingId":"0222468c-8236-4f86-a806-93bf5da206ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/85 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/85"},{"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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token price quotes via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on a per-request payment basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-per-use API access without accounts","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.682Z"},"updatedAt":"2026-04-23T16:30:38.794Z"}}