{"id":"d6982407-6586-4b10-a6ef-63b2b1c95571","shortId":"7yj8mm","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/183` 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 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). However, documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" page with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No API documentation available — all doc pages resolve to a minimal 'Connect wallet' stub","The specific endpoint /api/v1/charges/183 has no description beyond 'Premium API Access'; its actual functionality is unknown","No request or response schema is documented anywhere","No OpenAPI spec or machine-readable API description found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/183","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/charges/183","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, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty stubs. The specific purpose of '/api/v1/charges/183' beyond 'Premium API Access' is unclear. This is effectively a stub 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'/request':13,28 '0.02':12,27,63,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'Base network API' 'USDC micropayment API' 'accept':140 'access':101 'actual':206 'advertis':149 'ai':161 'ai/ml':48 'analysi':165 'analyt':47,155 'api':5,20,37,73,100 'application/json':145 'attach':83 'base':8,23,70,112,119 'base-network' 'behavior':207 'broader':147 'call':4,19 'caller':81 'categori':153 'challeng':106 'classif':168 'connect':197 'content':203 'convers':184 'crypto-paid API' 'data':46,51,154,158 'decim':127 'doc':189 'document':187 'embed':169 'enabl':36 'endpoint':44,56,93,139,150,213 'equal':121 'estim':179 'exact':132 'exchang':174 'export':159 'feed':173 'financ':170 'finance/web3':50 'four':152 'gas':178 'generat':185 'geocod':182 'given':123 'header':87 'howev':186 'http':141 'http-post' 'infer':49 'infrastructur':181 'insight':160 'json-response' 'key':74 'learn':163 'limit':76 'list':97 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':162 'metric':156 'minim':196 'network':9,24,71 'no-api-key' 'offer':40 'page':188,199 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':58 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'post':142 'premium':99 'price':172,190 'quot':177 'rate':75,175 'readm':191 'report':157 'request':61,90,107 'requir':80 'resolv':193 'respons':209 'return':103,144 'schema':210 'scheme':130 'second':136 'sentiment':164 'servic':54 'settl':65 'simpli':82 'span':45 'specif':92 'subscript':78 'substant':202 'summar':167 'text':166 'timeout':137 'token':176 'undocu':215 'unit':113 'usdc':15,30,67,115,124 'usdc-settlement' 'util':53 'valid':183 'varieti':42 'via':10,25 'wallet':198 'web3':171 'x402':11,26,35,85 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b42e8f97-97dc-4709-9145-aa93a3eae642","listingId":"d6982407-6586-4b10-a6ef-63b2b1c95571","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/charges/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:17.672Z"}],"sources":[{"listingId":"d6982407-6586-4b10-a6ef-63b2b1c95571","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:17.672Z","lastSeenAt":"2026-04-23T19:01:03.447Z"}],"details":{"listingId":"d6982407-6586-4b10-a6ef-63b2b1c95571","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/183 \\\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 priced at $0.02/request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/183"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/183"}],"useCases":["Accessing analytics and data feeds without subscription or API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding, validation, and data conversion utilities"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing quick access to diverse utility endpoints without onboarding"],"notFor":["High-volume production workloads where per-request pricing may add up","Users who need detailed API documentation, SDKs, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.805Z"},"updatedAt":"2026-04-23T19:01:03.447Z"}}