{"id":"529c5e27-688a-43d4-9541-6b8b1b912910","shortId":"k44yTP","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/37` 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 made via the x402 `X-PAYMENT` header using the `exact` scheme — no API keys, accounts, or rate limits are required.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02 per request price point. However, the specific resource/37 endpoint's exact functionality is not documented beyond the generic \"Premium API Access\" label, and the crawled docs, pricing, and README pages all returned only a wallet-connect prompt with no substantive documentation.\n\nBecause there is no OpenAPI schema, no request/response examples, and no detailed documentation for this specific endpoint, agents should treat this listing with caution. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown from available sources.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","Base USDC API","premium API access"],"warnings":["No documentation available — docs, pricing, and README pages all return only a wallet-connect prompt with no content","The specific functionality of /api/v1/generate/resource/37 ('Premium API Access') is completely undocumented","No request or response schema is provided; agents cannot know what to send or what they will receive","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/37","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/37","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 there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a generic label. The docs, pricing, and README pages all returned only a wallet-connect prompt. The actual functionality of resource/37 is 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'/request':17,34 '0.02':16,33,78,161 '000':82 '20':81 '402':236 '6':88 'Base USDC API' 'access':45,73,182 'account':107 'actual':241 'advertis':116 'agent':221 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,72,105,120,181 'avail':249 'base':7,24,61,83 'behind':51 'beyond':177 'broader':114 'call':80 'categori':118 'caution':227 'challeng':237 'classif':135 'confirm':231 'connect':198 'convers':152 'cost':75 'crawl':186 'data':9,26,121,125 'decim':89 'detail':215 'doc':187 'document':176,203,216 'embed':136 'endpoint':14,31,50,65,155,170,220,229 'estim':146 'exact':102,172 'exampl':212 'exchang':141 'export':126 'feed':140 'financ':11,28,137 'four':117 'function':173 'gas':145 'gate':3,20,44 'generat':153 'generic':179 'geocod':150 'header':99 'howev':166 'infrastructur':148 'insight':127 'json-response' 'key':106 'label':183 'learn':130 'limit':110 'list':69,157,225 'live':232 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'made':92 'marketplac':42 'metric':123 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':208 'page':191 'pay-per-call API' 'payment':90,98,245 'per':53,79,162 'per-request':52 'per-request-micropayment' 'platform':5,22,115 'point':165 'premium':71,180 'premium API access' 'price':139,164,188 'prompt':199 'protocol':40 'quot':144 'rate':109,142 'readm':190 'report':124 'request':54,163 'request/response':211 'requir':112 'resource/37':169 'return':193,233,242 'schema':209 'scheme':103 'sentiment':131 'settl':56 'sourc':250 'specif':64,168,219 'substant':202 'success':244 'summar':134 'text':133 'token':143 'treat':223 'unit':84 'unknown':247 'upon':243 'usdc':58,86 'usdc-base' 'use':100 'util':13,30,149 'valid':151,235 'varieti':48 'via':93 'wallet':197 'wallet-connect':196 'web3':138 'x':97 'x-payment':96 'x402':2,19,39,95 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"bd79215f-1e3f-49d4-b785-4b41249c4d72","listingId":"529c5e27-688a-43d4-9541-6b8b1b912910","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:10.159Z"}],"sources":[{"listingId":"529c5e27-688a-43d4-9541-6b8b1b912910","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:10.159Z","lastSeenAt":"2026-04-23T13:30:31.978Z"}],"details":{"listingId":"529c5e27-688a-43d4-9541-6b8b1b912910","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/37 \\\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":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/37"},{"claim":"All endpoints are listed 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 APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/37"}],"useCases":["Paying per-request for API access without needing an account or API key","Integrating micropayment-gated services into autonomous agent workflows","Accessing utility or data endpoints with USDC on Base network"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Prototyping workflows that need low-cost per-call billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring free or subscription-based pricing models","Use cases needing high-throughput batch processing with volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.71Z"},"updatedAt":"2026-04-23T13:30:31.978Z"}}