{"id":"ba441058-fb89-4764-a3b0-78871e3bcfd2","shortId":"SfFejh","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments — payment is handled inline via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint at `/api/v1/orders/19` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nThe broader platform lists additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so details about request/response schemas, supported parameters, and actual data sources remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limit","post-method"],"categories":["api-marketplace","data"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No request or response schema available — the actual data returned by this endpoint is unknown.","Documentation pages (/docs, /pricing, /README) contain no substantive content.","The specific purpose of /api/v1/orders/19 ('Premium API Access') is not explained; it may be a generic or placeholder endpoint.","The broader platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have documented schemas or verifiable functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/19","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/orders/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific '/orders/19' endpoint is unclear beyond the generic 'Premium API Access' 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'/call':13,28 '0.02':12,27,120,189 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':114 '20':108 '2913':115 '300':135 '6':125 'Base network API' 'USDC API' 'accept':97 'access':7,22,95 'across':150 'actual':218 'addit':148 'address':131 'advertis':103 'ai':160 'ai/ml':48 'analysi':164 'analyt':47,154 'api':6,21,37,64,94 'application/json':143 'base':9,24,82,110,117 'broader':145 'categori':152 'challeng':102 'classif':167 'commit':71 'connect':203 'content':209 'convers':183 'cost':106 'crawl':194 'data':46,51,153,157,219 'decim':126 'detail':211 'doc':197 'document':195 'embed':168 'enabl':36 'endpoint':44,56,88,149 'equal':119 'estim':178 'exchang':173 'export':158 'feed':172 'financ':169 'finance/web3':50 'four':151 'gas':177 'generat':184 'geocod':181 'handl':74 'howev':192 'infer':49 'infrastructur':53,180 'inlin':75 'insight':159 'json-api' 'key':65 'label':92 'learn':162 'limit':68 'list':147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':161 'maximum':105 'metric':155 'micropayment API' 'mime':140 'network':83 'no-api-key' 'no-rate-limit' 'offer':40 'page':196 'paramet':216 'pay':2,17,59 'pay-per-call API' 'pay-per-request':1,16,58 'payment':72,127 'per':3,18,60,121,190 'platform':38,146 'post':98 'post-method' 'premium':5,20,93 'premium API access' 'price':171,187,198 'prompt':205 'protocol':79 'quot':176 'rate':67,174 'readm':199 'remain':221 'report':156 'request':4,19,61,99,122,191 'request/response':213 'respons':139 'return':200 'schema':214 'second':136 'sent':129 'sentiment':163 'sourc':220 'span':45 'specif':87 'substant':208 'suit':42 'summar':166 'support':215 'text':165 'timeout':137 'token':175 'type':141 'unit':111 'unknown':222 'usdc':15,30,85,113,123 'usdc-base' 'use':84,124 'util':54 'valid':182 'via':10,25,76 'wallet':204 'web3':170 'x402':11,26,35,78,101 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9b378b0f-7ef2-4cdf-a4b3-b1036651eb6c","listingId":"ba441058-fb89-4764-a3b0-78871e3bcfd2","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/orders/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:21.304Z"}],"sources":[{"listingId":"ba441058-fb89-4764-a3b0-78871e3bcfd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:21.304Z","lastSeenAt":"2026-04-23T10:30:29.974Z"}],"details":{"listingId":"ba441058-fb89-4764-a3b0-78871e3bcfd2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/19 \\\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":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/19"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/19"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC payment","Testing x402 payment flows on the Base network"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume consumers needing bulk pricing or SLAs","Users without a Base-network USDC wallet","Anyone requiring detailed API documentation or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.194Z"},"updatedAt":"2026-04-23T10:30:29.974Z"}}