{"id":"15e3ca8b-251b-4180-90da-f7de2b80bc6f","shortId":"qwLRu3","kind":"x402","title":"Pay-per-call API suite on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible through the x402 payment protocol on the Base network, settling in USDC. The specific endpoint `/api/v1/products/10` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The site advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nNote that documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual behavior and response format of `/api/v1/products/10` specifically is unknown; the endpoint name \"Premium API Access\" does not clarify what data or service it provides. Agents should treat this as a live but poorly documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["general","ai","finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/products/10 ('Premium API Access') is not explained anywhere","No examples of successful responses are available to verify endpoint functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/10","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/products/10","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 it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of '/api/v1/products/10' specifically is unclear. This is effectively a stub 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'/api/v1/products/10':68,216 '/docs':178 '/pricing':179 '/readme':182 '/request':20,40,164 '0.02':19,39,90,163 '000':84 '20':83 '402':78 'Base network API' 'USDC micropayment API' 'access':52,74,104,225 'across':120 'actual':210 'advertis':95 'agent':235 'ai':13,33,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,25,50,73,97,224 'attach':107 'avail':208 'base':8,28,60,85 'base-network' 'behavior':211 'beyond':170 'broader':116 'call':4,24,92 'categori':122 'challeng':79 'clarifi':228 'classif':137 'collect':44 'connect':188 'content':194 'convers':154 'crypto-paid API' 'data':12,32,123,127,230 'data-analytics' 'document':169,203,244 'embed':138 'endpoint':17,37,51,67,119,157,221,245 'estim':148 'exampl':207 'exchang':143 'export':128 'extrem':175 'feed':142 'financ':14,34,139 'finance-data' 'format':214 'four':121 'gas':147 'generat':155 'geocod':152 'header':111 'host':42 'i.e':89 'infrastructur':150 'insight':129 'instant':103 'key':98 'land':172 'learn':132 'limit':101 'list':70,159 'live':241 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':131 'metric':125 'name':222 'network':61 'no-api-key' 'note':167 'offer':118 'openapi':198 'page':173,183 'pay':2,22,47 'pay-per-cal':1,21 'pay-per-call API' 'pay-per-request':46 'payment':56,110 'per':3,23,48,91 'platform':117 'point':166 'poor':243 'premium':72,223 'price':141,165 'prompt':190 'protocol':57 'provid':234 'quot':146 'rate':100,144 'render':185 'report':126 'request':49,80,114 'request/response':201 'respons':213 'return':76 'schema':202 'sentiment':133 'servic':232 'settl':62 'simpli':106 'site':94 'spec':199 'specif':66,217 'substant':193 'suit':6,26 'summar':136 'text':135 'thin':176 'token':145 'treat':237 'unit':86 'unknown':219 'usag':206 'usdc':9,29,64,88 'usdc-settlement' 'util':16,36,151 'utility-services' 'valid':153 'via':10,30 'wallet':189 'web3':140 'x402':11,31,55,109 'x402 API' 'x402-payment'","prices":[{"id":"f0285482-d8e8-4ec2-bbb6-c4cd13efc728","listingId":"15e3ca8b-251b-4180-90da-f7de2b80bc6f","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/products/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:33.103Z"}],"sources":[{"listingId":"15e3ca8b-251b-4180-90da-f7de2b80bc6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:33.103Z","lastSeenAt":"2026-04-22T12:03:13.241Z"}],"details":{"listingId":"15e3ca8b-251b-4180-90da-f7de2b80bc6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/10 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/10"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/10"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports without subscription or API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments","Using utility services like geocoding and validation with no upfront commitment"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring occasional or bursty API calls without rate limits","Crypto-native workflows that can attach x402 USDC payments on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing would be preferred","Developers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.609Z"},"updatedAt":"2026-04-22T12:03:13.241Z"}}