{"id":"236172e1-0d58-444b-8c21-85c03f877fc5","shortId":"nLCqv8","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/generate/resource/31` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact-payment scheme. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request.\n\nThe provider's landing page 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is made inline via the x402 `X-PAYMENT` header.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The exact functionality behind the `/api/v1/generate/resource/31` path (labeled \"Premium API Access\") is unclear; it may correspond to the \"Generation\" utility endpoint or something else entirely. Without documentation, callers must experiment to discover the expected input format and output shape.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API marketplace"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request and response formats are unknown.","The specific function of /api/v1/generate/resource/31 ('Premium API Access') is undocumented and unclear.","Cannot verify actual endpoint behavior beyond the 402 challenge without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schemas, no examples, and the /docs page is empty. The purpose of this specific resource path is 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'/api/v1/generate/resource/31':65,228 '/docs':188 '/pricing':190 '/readme':192 '/request':17,34 '0.02':16,33,103,158 '000':98 '20':97 '6':108 'Base network API' 'USDC micropayment API' 'accept':73 'access':71,233 'advertis':117 'ai':10,27,128 'ai-inference' 'analysi':132 'analyt':122 'api':4,21,41,70,163,232 'avail':219 'base':7,24,59,99 'base-network' 'behind':226 'broad':46 'call':52 'caller':250 'catalog':47 'categori':120 'challeng':87 'classif':135 'commit':171 'confirm':88 'connect':198 'convers':151 'correspond':238 'crawl':222 'crypto-paid API' 'data':9,26,121,125 'data-analytics' 'decim':109 'detail':205 'discov':254 'document':183,214,249 'els':246 'embed':136 'enabl':40 'endpoint':14,31,53,63,90,119,154,243 'entir':247 'estim':146 'exact':82,224 'exact-pay':81 'exampl':218 'exchang':141 'expect':256 'experi':252 'export':126 'expos':44 'extrem':185 'feed':140 'financ':11,28,137 'finance-data' 'format':258 'four':118 'function':225 'gas':145 'generat':152,241 'geocod':149 'header':182 'infrastructur':148 'inlin':175 'input':257 'insight':127 'key':164 'label':230 'land':115 'learn':130 'limit':167 'list':67,156 'live':92 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'made':174 'maximum':95 'may':237 'metric':123 'minimum':170 'must':251 'network':60 'no-api-key' 'offer':8,25 'openapi':209 'output':260 'page':116,193 'path':229 'pay':50 'pay-per-cal':49 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'payment':77,83,172,181 'per':51,110,159 'platform':5,22,42 'post':74 'post-endpoint' 'premium':69,231 'price':139 'prompt':200 'provid':113 'quot':144 'rate':142,166 'render':195 'report':124 'request':75,111,160 'request/response':212 'requir':93 'schema':213 'scheme':84 'sentiment':131 'serverless API marketplace' 'settl':54 'shape':261 'sinc':105 'someth':245 'spars':186 'spec':210 'specif':62 'summar':134 'technic':204 'text':133 'token':143 'unclear':235 'unit':100 'usag':217 'usd':104 'usdc':56,102,106 'usdc-settlement' 'use':107 'util':13,30,242 'utility-services' 'valid':150 'via':78,176 'wallet':199 'web3':138 'without':248 'x':180 'x-payment':179 'x402':2,19,39,80,86,178 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"6e5bcacb-a468-47ad-af8c-7aad9a669ad9","listingId":"236172e1-0d58-444b-8c21-85c03f877fc5","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:33.090Z"}],"sources":[{"listingId":"236172e1-0d58-444b-8c21-85c03f877fc5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:33.090Z","lastSeenAt":"2026-04-24T09:03:04.131Z"}],"details":{"listingId":"236172e1-0d58-444b-8c21-85c03f877fc5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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/31"},{"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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/31"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying per-call for data analytics, AI inference, or financial data via USDC on Base","Integrating utility services (geocoding, validation, conversion) with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","Use cases requiring very low per-request costs ($0.02) settled on-chain","Crypto-native applications that already hold USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where undocumented endpoints pose a reliability risk"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.511Z"},"updatedAt":"2026-04-24T09:03:04.131Z"}}