{"id":"f5a85e59-f7b4-4d96-9516-3754d67de66f","shortId":"KCfhxC","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 across data analytics, AI/ML inference, finance/Web3, 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/transactions/170` 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. The platform advertises categories including 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).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what any endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality `/api/v1/transactions/170` specifically provides beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/transactions/170 ('Premium API Access') is undocumented — unclear what it returns","No request body schema or response schema is documented anywhere","Cannot verify what data or service any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/170","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/transactions/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/transactions/170 is unclear beyond the generic 'Premium API Access' label. Pricing is clear ($0.02/request) but everything else must be 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'/api/v1/transactions/170':94,217 '/docs':165 '/pricing':167 '/readme':169 '/request':13,28 '0.02':12,27,62,121 '000':110 '0x8335':115 '20':109 '2913':116 '402':104,204 'access':100,225 'account':74 'across':45 'actual':198 'advertis':124 'ai':134 'ai-inference' 'ai/ml':48 'analysi':138 'analyt':47,128 'api':5,20,37,72,99,224 'attach':82 'base':8,23,69,111,118 'base network api' 'base-network' 'beyond':220 'call':4,19 'caller':80 'categori':125 'challeng':105,205 'classif':141 'classification' 'confirm':206 'connect':175 'content':181 'convers':158 'data':46,127,131,214 'data-analytics' 'document':160,190,209 'embed':142 'embeddings' 'enabl':36 'endpoint':44,55,92,197,201 'equal':120 'estim':152 'exampl':193 'exchang':147 'export':132 'extrem':162 'feed':146 'financ':143 'finance-data' 'finance/web3':50 'function':216 'gas':151 'generat':159 'generic':222 'geocod':156 'geocoding' 'header':86 'includ':126 'infer':49 'infrastructur':154 'insight':133 'key':73 'label':226 'learn':136 'limit':77 'list':96 'live':203 'low payment fee' 'lowpaymentfee.com':31 'machin':135 'metric':129 'micropayment api' 'network':9,24,70 'no-api-key' 'no-auth api' 'offer':40 'openapi':185 'page':170 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85 'per':3,18,59 'platform':6,21,38,123 'premium':98,223 'price':145 'prompt':177 'provid':219 'quot':150 'rate':76,148 'render':172 'report':130 'request':60,89,106 'request/response':188 'requir':79 'return':102,199 'schema':189 'sentiment':137 'sentiment-analysis' 'servic':53 'settl':64 'simpli':81 'spars':163 'spec':186 'specif':91,218 'summar':140 'text':139 'text-summarization' 'token':149 'unclear':212 'unit':112 'usdc':15,30,66,114 'usdc api' 'usdc-settlement' 'util':52,155 'utility-services' 'valid':157 'varieti':42 'via':10,25 'wallet':176 'web3':144 'without':208 'x402':11,26,35,84 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b95774c6-6bbe-407e-b3bf-23ba6f677e77","listingId":"f5a85e59-f7b4-4d96-9516-3754d67de66f","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/transactions/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:56.435Z"}],"sources":[{"listingId":"f5a85e59-f7b4-4d96-9516-3754d67de66f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:56.435Z","lastSeenAt":"2026-04-22T13:31:46.546Z"}],"details":{"listingId":"f5a85e59-f7b4-4d96-9516-3754d67de66f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/170 \\\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 requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/170"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/170"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for AI inference tasks like sentiment analysis or text summarization","Fetching financial data such as exchange rates, token quotes, or gas estimates","Geocoding or data validation as a lightweight utility service"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers prototyping with pay-as-you-go endpoints on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.607Z"},"updatedAt":"2026-04-22T13:31:46.546Z"}}