{"id":"d606ca46-c229-472e-bc34-f63a8d1db753","shortId":"JUCet2","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 catalog 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/transactions/206` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a \"Connect wallet\" prompt), so the actual behavior, request schemas, and response formats for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai-ml","data","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API payments"],"warnings":["No documentation available — all doc/pricing/API pages render only a 'Connect wallet' prompt with no content.","The purpose and behavior of /api/v1/transactions/206 ('Premium API Access') is completely undocumented; request/response schemas are unknown.","The broader platform lists many endpoint categories but none have documented schemas or example responses.","Cannot verify that any of the advertised endpoints (AI, finance, analytics, etc.) actually return meaningful data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/206","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/206","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint actually does, what request body it expects, or what it returns. All doc pages are empty beyond a wallet-connect prompt. The listing title 'Premium API Access' is generic and uninformative. Without schemas or examples, this is effectively a 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'/request':13,28 '0.02':12,27,64,121,186 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':115 '20':109 '2913':116 '300':149 '6':125 'Base network API' 'USDC micropayment API' 'accept':135 'access':102 'account':76 'actual':209 'address':145 'advertis':104,155 'ai/ml':49 'amount':107 'analysi':164 'analyt':48 'api':5,20,37,74,101 'application/json':140 'attach':84 'base':8,23,71,111,118 'base-network' 'behavior':210 'beyond':191 'broad':42 'broader':153 'call':4,19 'caller':82 'catalog':43 'categori':156 'challeng':129 'classif':167 'confirm':130 'connect':204 'convers':179 'crypto-paid API' 'data':47,52,160 'decim':126 'doc/pricing/api':199 'document':190 'embed':168 'empti':197 'enabl':36 'endpoint':45,57,94,132,218 'equal':120 'essenti':196 'estim':176 'exchang':171 'export':161 'feed':170 'finance/web3':51 'format':215 'gas':175 'generat':181 'geocod':177 'given':122 'header':88 'howev':189 'includ':157 'individu':217 'infer':50 'insight':162 'json-response' 'key':75 'land':193 'limit':79 'list':98 'live':134 'lowpaymentfee' 'lowpaymentfee.com':31 'max':106 'metric':158 'network':9,24,72 'no-api-key' 'offer':40 'page':194,200 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,141 'per':3,18,61 'platform':6,21,38,154 'point':188 'post':136 'post-method' 'premium':100 'price':169,187 'prompt':206 'quot':174 'rate':78,172 'report':159 'request':62,91,137,211 'requir':81 'respons':214 'return':139 'schema':212 'second':150 'sent':143 'sentiment':163 'serverless API payments' 'servic':55 'settl':66 'show':202 'simpli':83 'span':46 'specif':93 'summar':166 'text':165 'timeout':151 'token':173 'unit':112 'unknown':220 'usdc':15,30,68,114,123 'usdc-settlement' 'util':54 'valid':178 'via':10,25 'wallet':205 'x402':11,26,35,86,128 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9832ccc5-6124-4883-a198-1601a30f9521","listingId":"d606ca46-c229-472e-bc34-f63a8d1db753","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/206","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:12.657Z"}],"sources":[{"listingId":"d606ca46-c229-472e-bc34-f63a8d1db753","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/206","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:12.657Z","lastSeenAt":"2026-04-23T19:01:46.047Z"}],"details":{"listingId":"d606ca46-c229-472e-bc34-f63a8d1db753","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/206 \\\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 with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/transactions/206"},{"claim":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Paying for API access with USDC on Base L2 for low transaction fees"],"bestFor":["Agents or scripts that need frictionless, key-free API access via crypto micropayments","Developers experimenting with x402 payment protocol integrations","Use cases requiring pay-as-you-go pricing with no minimum commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement overhead matters","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.952Z"},"updatedAt":"2026-04-23T19:01:46.047Z"}}