{"id":"24093aad-4f7b-4d76-b8dc-c574a7896ca5","shortId":"77d4qA","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/23` 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 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints in four categories: 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The specific purpose and expected input/output of /api/v1/transactions/23 is undocumented — the name 'Premium API Access' is generic and uninformative.","Documentation, pricing, and README pages require wallet connection and yield no readable content from crawl.","No OpenAPI spec or request/response schema is available for any endpoint.","The breadth of advertised endpoints (AI, finance, geo, analytics) is unusual for a single provider at uniform $0.02 pricing — actual functionality behind each endpoint is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/23","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and the docs/pricing/README pages all render only a wallet-connect prompt with no usable content. The purpose of '/api/v1/transactions/23' specifically is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402':106 '6':127 'Base network API' 'USDC API' 'accept':141 'access':102 'account':76 'advertis':150 'ai':162 'ai/ml':49 'analysi':166 'analyt':48,156 'api':5,20,37,74,101 'appear':191 'application/json':146 'attach':84 'avail':207 'base':8,23,71,113,120 'base-network' 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':154 'challeng':107 'classif':169 'connect':195 'convers':185 'crawl':210 'crypto-paid API' 'data':47,52,155,159 'decim':128 'detail':199 'document':187 'embed':170 'enabl':36 'endpoint':45,57,94,140,151,204 'equal':122 'estim':180 'exact':133 'exchang':175 'exist':189 'export':160 'feed':174 'financ':171 'finance/web3':51 'four':153 'gas':179 'generat':186 'geocod':183 'given':124 'header':88 'individu':203 'infer':50 'infrastructur':182 'insight':161 'json-response' 'key':75 'learn':164 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':163 'metric':157 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'page':188 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'post-method' 'premium':100 'price':173 'quot':178 'rate':78,176 'report':158 'request':62,91,108,143 'request/response':200 'requir':81,193 'return':104,145 'schema':201 'scheme':131 'second':137 'sentiment':165 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93 'summar':168 'text':167 'timeout':138 'token':177 'unit':114 'usdc':15,30,68,116,125 'usdc-settlement' 'util':54 'valid':184 'via':10,25 'view':197 'wallet':194 'web3':172 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4260c893-e155-427f-b5e4-72d59f98864d","listingId":"24093aad-4f7b-4d76-b8dc-c574a7896ca5","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:27.061Z"}],"sources":[{"listingId":"24093aad-4f7b-4d76-b8dc-c574a7896ca5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.061Z","lastSeenAt":"2026-04-22T21:31:38.205Z"}],"details":{"listingId":"24093aad-4f7b-4d76-b8dc-c574a7896ca5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/23 \\\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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/23"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without needing an API key or subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Agents and bots that need instant, keyless API access paid per call","Developers prototyping with low-commitment, no-subscription APIs","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.164Z"},"updatedAt":"2026-04-22T21:31:38.205Z"}}