{"id":"a78c201a-29e1-4788-8049-03db54242f57","shortId":"2KYD76","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/transactions/33` is listed as \"Premium API Access\" and advertises a maximum cost 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. The payment is settled 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 pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of individual endpoints remain undocumented and unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["infrastructure","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or response schema provided; actual endpoint behavior is unknown","The specific purpose of /api/v1/transactions/33 ('Premium API Access') is not explained anywhere","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The purpose of this specific /transactions/33 endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,64,121,187 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':115 '20':109 '2913':116 '300':150 '6':125 'Base network API' 'USDC micropayment API' 'accept':135 'access':102 'actual':208 'address':146 'advertis':104,156 'ai/ml':49 'analysi':165 'analyt':48 'api':5,20,37,74,101 'application/json':140 'attach':84 'base':8,23,71,111,118 'behavior':209 'broad':42 'broader':154 'call':4,19 'caller':82 'categori':157 'challeng':129 'classif':168 'confirm':130 'connect':199 'content':205 'convers':180 'cost':107 'crypto-paid API' 'data':47,52,161 'decim':126 'doc':193 'document':191 'embed':169 'enabl':36 'endpoint':45,57,94,132,215 'equal':120 'estim':177 'exchang':172 'export':162 'feed':171 'finance/web3':51 'gas':176 'generat':182 'geocod':178 'given':122 'header':88 'howev':190 'includ':158 'individu':214 'infer':50 'insight':163 'json-response' 'key':75 'limit':77 'list':98 'live':134 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':106 'metric':159 'network':9,24,72 'no-api-key' 'offer':40 'page':192 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,142 'per':3,18,61 'platform':6,21,38,155 'point':189 'post':136 'post-method' 'premium':100 'premium API access' 'price':170,188,194 'prompt':201 'quot':175 'rate':76,173 'readm':195 'remain':216 'report':160 'request':62,91,137 'requir':81 'respons':211 'return':139,196 'schema':212 'second':151 'sentiment':164 'servic':55 'set':43 'settl':66,144 'simpli':83 'span':46 'specif':93 'subscript':79 'substant':204 'summar':167 'text':166 'timeout':152 'token':174 'undocu':217 'unit':112 'unverifi':219 'usdc':15,30,68,114,123 'usdc-base' 'util':54 'valid':179 'via':10,25 'wallet':200 'x402':11,26,35,86,128 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"cdbdba72-5ac6-43a4-b253-c49fa5b7ca60","listingId":"a78c201a-29e1-4788-8049-03db54242f57","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:13.767Z"}],"sources":[{"listingId":"a78c201a-29e1-4788-8049-03db54242f57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:13.767Z","lastSeenAt":"2026-04-24T07:32:36.480Z"}],"details":{"listingId":"a78c201a-29e1-4788-8049-03db54242f57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/33 \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/33"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, README) contain no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to utility/data endpoints with per-call USDC micropayments","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Projects needing low-cost per-request billing without rate limits"],"notFor":["Users who need detailed API documentation or response schema guarantees before calling","High-volume use cases where $0.02/request adds up (no bulk discounts documented)","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.501Z"},"updatedAt":"2026-04-24T07:32:36.480Z"}}