{"id":"6f79cd7b-4cdf-45d9-a74b-d3ecd77b974e","shortId":"nP7vEw","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 broad set 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/policies/34` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader 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). Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","low fee API","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all appear gated behind wallet connection — no usable docs were retrieved.","The specific purpose of /api/v1/policies/34 ('Premium API Access') is unclear; it does not match any of the named endpoints on the landing page.","No OpenAPI spec or request/response schema available — callers must guess at the expected POST body and response format.","No information on uptime guarantees, error handling, or data freshness."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/34","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/policies/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are gated behind wallet connection, yielding no request/response schemas, no OpenAPI spec, and no concrete examples of what /api/v1/policies/34 actually returns. The endpoint name 'Premium API Access' is generic and its specific functionality is 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':131 '402':106 'Base network API' 'USDC API' 'accept':136 'access':102 'advertis':145 'ai':155 'ai-inference' 'ai/ml':49 'analysi':159 'analyt':48,149 'api':5,20,37,74,101 'appear':185 'application/json':141 'attach':84 'avail':200 'base':8,23,71,113,120 'behind':187 'broad':42 'broader':143 'call':4,19 'caller':82 'categori':146 'challeng':107 'classif':162 'connect':190 'convers':179 'crawl':203 'crypto-paid API' 'data':47,52,148,152 'data-analytics' 'detail':192 'document':181 'embed':163 'enabl':36 'endpoint':45,57,94,135,197 'equal':122 'estim':173 'exact':128 'exchang':168 'exist':183 'export':153 'feed':167 'financ':164 'finance-data' 'finance/web3':51 'gas':172 'gate':186 'generat':180 'geocod':177 'header':88 'includ':147 'individu':196 'infer':50 'infrastructur':175 'insight':154 'json-api' 'key':75 'learn':157 'limit':77 'list':98 'low fee API' 'lowpaymentfee.com':31 'machin':156 'metric':150 'micropayment API' 'network':9,24,72 'no-api-key' 'no-rate-limit' 'offer':40 'page':182 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,125 'per':3,18,61 'platform':6,21,38,144 'post':137 'premium':100 'premium API access' 'price':166 'quot':171 'rate':76,169 'report':151 'request':62,91,108,138 'request/response':193 'requir':81 'return':104,140 'schema':194 'scheme':126 'second':132 'sentiment':158 'servic':55 'set':43 'settl':66 'simpli':83 'span':46 'specif':93 'subscript':79 'summar':161 'text':160 'timeout':133 'token':170 'unit':114 'usdc':15,30,68,116 'usdc-base' 'util':54,176 'utility-services' 'valid':178 'via':10,25 'wallet':189 'web3':165 'web3-data' 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4f43b161-e007-4ea3-89d3-2db5689333ce","listingId":"6f79cd7b-4cdf-45d9-a74b-d3ecd77b974e","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/policies/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:51.131Z"}],"sources":[{"listingId":"6f79cd7b-4cdf-45d9-a74b-d3ecd77b974e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:51.131Z","lastSeenAt":"2026-04-23T02:01:23.233Z"}],"details":{"listingId":"6f79cd7b-4cdf-45d9-a74b-d3ecd77b974e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/34 \\\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 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/34"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/34"}],"useCases":["Agents that need on-demand access to analytics, AI inference, or financial data without managing API keys or subscriptions","Programmatic access to sentiment analysis, text summarization, or classification at $0.02 per call","Fetching real-time crypto gas estimates or token quotes with instant x402 payment","Geocoding or data validation as a utility microservice paid per request"],"bestFor":["AI agents and bots that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call without signup"],"notFor":["Users who need free or subscription-based API access without crypto wallets","High-volume batch workloads where per-request pricing at $0.02 adds up significantly","Applications requiring detailed SLAs or guaranteed uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.943Z"},"updatedAt":"2026-04-23T02:01:23.233Z"}}