{"id":"fee1b392-e7cf-4095-a681-f7f046352bd3","shortId":"qYEWxG","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/135` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms it accepts POST requests and returns application/json. However, the exact functionality of this particular transactions endpoint is not documented — the site's landing page lists categories like analytics, AI, finance, and utilities but does not include a `/transactions/` route among them.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to be behind a wallet-connect gate and did not yield substantive content during crawling, so detailed request/response schemas for any endpoint are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limits"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The /api/v1/transactions/135 endpoint is not listed among the site's documented API categories — its exact functionality is unknown.","All documentation pages (docs, pricing, README) are behind a wallet-connect gate and returned no usable content.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The purpose of 'Premium API Access' at this specific transactions path is ambiguous."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/135","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/135","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 per call on Base). However, the specific /transactions/135 endpoint has no documentation, no request/response schema, and its purpose is unclear. All doc pages are gated behind wallet-connect and returned no content. This is effectively a stub 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'/request':13,28 '/transactions':162 '0.02':12,27,64,115,118,192 '000':110 '20':109 'Base network API' 'USDC API' 'accept':126 'access':102 'account':76 'advertis':104,169 'ai':153 'ai/ml':49 'among':164 'analysi':173 'analyt':48,152 'api':5,20,37,74,101 'appear':200 'application/json':131 'attach':84 'base':8,23,71,111 'base-network' 'behind':203 'broad':42 'broader':167 'call':4,19,120 'caller':82 'catalog':43 'categori':150 'challeng':123 'classif':176 'confirm':124 'connect':207 'content':214 'convers':184 'cost':107 'crawl':216 'crypto-paid API' 'data':47,52,186 'detail':218 'doc':197 'document':143,195 'embed':177 'enabl':36 'endpoint':45,57,94,140,170,223 'exact':134 'exchang':180 'export':187 'feed':179 'financ':154 'finance/web3':51 'function':135 'gate':208 'geocod':182 'header':88 'howev':132 'i.e':117 'includ':160 'infer':50 'json-api' 'key':75 'land':147 'like':151 'limit':79 'list':98,149 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':106 'micropayment API' 'network':9,24,72 'no-api-key' 'no-rate-limits' 'offer':40 'page':148,196 'particular':138 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87 'per':3,18,61,119 'platform':6,21,38,168 'point':194 'post':127 'premium':100 'price':178,193,198 'rate':78,181 'readm':199 'request':62,91,128 'request/response':219 'requir':81 'return':130 'rout':163 'schema':220 'sentiment':172 'servic':55 'settl':66 'simpli':83 'site':145 'span':46 'specif':93 'substant':213 'summar':175 'text':174 'transact':139 'unavail':225 'unit':112 'usdc':15,30,68,114,116 'usdc-settlement' 'util':54,156 'valid':183 'via':10,25 'wallet':206 'wallet-connect':205 'x402':11,26,35,86,122 'x402 API' 'x402-enabled':34 'x402-payment' 'yield':212","prices":[{"id":"0350a2d0-34ce-4561-8302-5081344068ca","listingId":"fee1b392-e7cf-4095-a681-f7f046352bd3","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:32.196Z"}],"sources":[{"listingId":"fee1b392-e7cf-4095-a681-f7f046352bd3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:32.196Z","lastSeenAt":"2026-04-22T13:31:45.134Z"}],"details":{"listingId":"fee1b392-e7cf-4095-a681-f7f046352bd3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/135 \\\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 are 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":"The x402 challenge for /api/v1/transactions/135 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/135"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from an AI agent with x402-compatible wallet","Programmatic access to analytics, AI inference, or financial data at micro-transaction pricing"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users without a Base-network USDC wallet or x402-capable client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.83Z"},"updatedAt":"2026-04-22T13:31:45.134Z"}}