{"id":"36812129-e282-456a-abc6-854931797e5d","shortId":"zgghGP","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/281` 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 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 (geocoding, validation, conversion, generation). However, the specific functionality behind the `/api/v1/transactions/281` path is not documented beyond the generic \"Premium API Access\" label, and the docs, pricing, and API pages all render only a wallet-connect prompt with no further detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai","data"],"synonyms":["x402 api","pay per call api","micropayment api","usdc api","base network api","lowpaymentfee","402 payment api"],"warnings":["The specific functionality of /api/v1/transactions/281 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, api, README) render only a wallet-connect prompt with no actual content.","No OpenAPI spec or request/response schema is provided for any endpoint.","The broad catalog of endpoints listed on the homepage cannot be verified as functional from the crawl data alone."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/281","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/281","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, but there is essentially no documentation for what this specific endpoint does. The docs, pricing, and API pages all render only a wallet-connect prompt. No OpenAPI spec, no request/response schemas, and no examples are available. The \"Premium API Access\" label is generic and 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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 '402 payment api' '6':127 'accept':141 'access':102,201 'account':76 'advertis':150 'ai':160 'ai/ml':49 'analysi':164 'analyt':48,154 'api':5,20,37,74,101,200,208 'application/json':146 'attach':84 'base':8,23,71,113,120 'base network api' 'base-network' 'behind':189 'beyond':196 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':151 'challeng':107 'classif':167 'connect':216 'convers':183 'data':47,52,153,157 'decim':128 'detail':221 'doc':205 'document':195 'embed':168 'enabl':36 'endpoint':45,57,94,140 'equal':122 'estim':178 'exact':133 'exchang':173 'export':158 'feed':172 'financ':169 'finance/web3':51 'function':188 'gas':177 'generat':184 'generic':198 'geocod':181 'given':124 'header':88 'howev':185 'includ':152 'infer':50 'infrastructur':180 'insight':159 'json-response' 'key':75 'label':202 'learn':162 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':161 'metric':155 'micropayment api' 'network':9,24,72 'no-api-key' 'offer':40 'page':209 'path':192 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'post-method' 'premium':100,199 'price':171,206 'prompt':217 'quot':176 'rate':78,174 'render':211 'report':156 'request':62,91,108,143 'requir':81 'return':104,145 'scheme':131 'second':137 'sentiment':163 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93,187 'summar':166 'text':165 'timeout':138 'token':175 'unit':114 'usdc':15,30,68,116,125 'usdc api' 'usdc-settlement' 'util':54 'valid':182 'via':10,25 'wallet':215 'wallet-connect':214 'web3':170 'x402':11,26,35,86 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5305dde6-2228-4e20-a2ba-db591e13e1c1","listingId":"36812129-e282-456a-abc6-854931797e5d","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/281","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:50.708Z"}],"sources":[{"listingId":"36812129-e282-456a-abc6-854931797e5d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/281","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:50.708Z","lastSeenAt":"2026-04-22T11:32:22.502Z"}],"details":{"listingId":"36812129-e282-456a-abc6-854931797e5d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/281 \\\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/281 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/281"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports on a per-request basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments","Using utility services like geocoding, validation, and conversion without API key management"],"bestFor":["Developers who want pay-as-you-go API access without accounts or API keys","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who don't want subscription commitments"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Consumers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.086Z"},"updatedAt":"2026-04-22T11:32:22.502Z"}}