{"id":"a9c3189b-acd1-4297-a64a-281da08bb246","shortId":"MB4PwT","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace 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, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/66` 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 POST requests 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). Documentation pages exist but appear to require a wallet connection and contain no visible content. There is no OpenAPI spec, no detailed request/response schemas, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No OpenAPI or schema documentation available — all doc pages require wallet connection and show no content","The endpoint path '/api/v1/orders/66' does not match any of the advertised API categories; its actual functionality is unknown","No request body schema or response schema is documented anywhere","No examples of successful responses are available","Platform appears to be early-stage with minimal public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/66","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/66","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 spec, no request/response schema documentation, no usage examples, and the docs/pricing/README pages are all blank (wallet-gated). The specific purpose of '/api/v1/orders/66' labeled 'Premium API Access' is unclear — it doesn't match any of the advertised endpoint categories. This is effectively a stub 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'/call':13,28 '0.02':12,27,63,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'accept':140 'access':101 'account':75 'advertis':149 'ai':161 'ai-inference' 'ai/ml':48 'analysi':165 'analyt':47,155 'api':5,20,37,73,100 'appear':190 'application/json':145 'attach':83 'avail':214 'base':8,23,70,112,119 'base network api' 'broader':147 'caller':81 'categori':153 'challeng':106 'classif':168 'classification' 'connect':195 'contain':197 'content':200 'convers':184 'crawl':217 'crypto-quotes' 'data':46,51,154,158 'data-analytics' 'decim':127 'detail':207 'document':186 'embed':169 'embeddings' 'enabl':36 'endpoint':44,56,93,139,150 'equal':121 'estim':179 'exact':132 'exampl':213 'exchang':174 'exist':188 'export':159 'feed':173 'financ':170 'finance-data' 'finance/web3':50 'four':152 'gas':178 'generat':185 'geocod':182 'geocoding' 'given':123 'header':87 'infer':49 'infrastructur':181 'insight':160 'key':74 'learn':163 'limit':78 'list':97 'low payment fee' 'lowpaymentfee.com':31 'machin':162 'marketplac':38 'materi':218 'metric':156 'micropayment api' 'network':9,24,71 'no-auth api' 'offer':40 'openapi':204 'page':187 'pay':2,17,59 'pay per call api' 'pay-per-request':1,16,58 'payment':86,129 'per':3,18,60 'platform':6,21,148 'post':141 'premium':99 'price':172 'quot':177 'rate':77,175 'report':157 'request':4,19,61,90,107,142 'request/response':208 'requir':80,192 'return':103,144 'schema':209 'scheme':130 'second':136 'sentiment':164 'sentiment-analysis' 'servic':54 'settl':65 'simpli':82 'span':45 'spec':205 'specif':92 'summar':167 'text':166 'text-summarization' 'timeout':137 'token':176 'unit':113 'usag':212 'usdc':15,30,67,115,124 'usdc api' 'usdc-base' 'util':53 'utility-services' 'valid':183 'varieti':42 'via':10,25 'visibl':199 'wallet':194 'web3':171 'x402':11,26,35,85 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c36288b3-faa5-43c3-8016-0178dc08ddc7","listingId":"a9c3189b-acd1-4297-a64a-281da08bb246","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:23.143Z"}],"sources":[{"listingId":"a9c3189b-acd1-4297-a64a-281da08bb246","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:23.143Z","lastSeenAt":"2026-04-23T21:31:33.958Z"}],"details":{"listingId":"a9c3189b-acd1-4297-a64a-281da08bb246","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/66 \\\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 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 x402 challenge for /api/v1/orders/66 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/66"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto quotes, gas estimates, or exchange rates on a per-call basis","Running geocoding or data validation as a lightweight utility call","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Agents or bots that need instant, keyless API access paid in USDC","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that prefer on-chain payment settlement"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI schemas before integrating","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.84Z"},"updatedAt":"2026-04-23T21:31:33.958Z"}}