{"id":"821e49f4-441b-4d98-9e97-43dc5f90bf23","shortId":"PyNz9J","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/343` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe platform advertises four categories of APIs: 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 utilities (geocoding, validation, conversion, generation). All endpoints follow the same $0.02 flat pricing model.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind `/api/v1/transactions/343` (labeled \"Premium API Access\") is unclear and does not correspond to any of the listed API categories on the homepage.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content","The endpoint path /api/v1/transactions/343 does not match any of the advertised API categories on the homepage — its actual functionality is unknown","No OpenAPI schema or request/response examples are available","No information about data sources, model providers, or accuracy guarantees for the AI/ML or finance endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/343","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/343","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — docs/pricing/API/README pages all show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the specific endpoint path (/api/v1/transactions/343) doesn't clearly map to any advertised service category. Pricing is clear ($0.02) but functionality is 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'/request':13,28 '0.02':12,27,59,106,159 '000':100 '20':99 '402':209 '6':110 'access':90,220 'actual':213 'advertis':116 'ai':128 'ai-inference' 'ai/ml':49 'analysi':132 'analyt':48,122 'api':5,20,37,71,89,120,169,219,232 'avail':197 'base':8,23,67,101,113 'base network api' 'behind':215 'broad':42 'call':4,19 'categori':118,233 'challeng':95,210 'classif':135 'classification' 'commit':78 'confirm':204 'connect':178 'content':184 'convers':152 'correspond':226 'cost':58 'crawl':200 'crypto api access' 'crypto-quotes' 'data':47,52,121,125 'data-analytics' 'decim':111 'detail':195 'doc':168 'document':163,196 'embed':136 'embeddings' 'enabl':36 'endpoint':45,57,82,155,202 'estim':146 'everi':56 'exampl':192 'exchang':141 'export':126 'extrem':165 'feed':140 'financ':137 'finance-data' 'finance/web3':51 'flat':160 'follow':156 'four':117 'function':214 'gas':145 'generat':153 'geocod':150 'geocoding' 'homepag':236 'i.e':105 'infer':50 'infrastructur':148 'insight':127 'key':72 'label':217 'learn':130 'limit':75 'list':86,231 'live':205 'low payment fee' 'lowpaymentfee.com':31 'machin':129 'metric':123 'micropayment api' 'model':162 'network':9,24,68 'offer':40 'openapi':188 'page':173 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'per':3,18,60 'platform':6,21,38,115 'premium':88,218 'price':139,161,170 'prompt':180 'quot':144 'rate':74,142 'readm':172 'render':175 'report':124 'request':61,96 'request/response':191 'requir':79 'return':92 'schema':189 'sentiment':131 'sentiment-analysis' 'servic':55 'set':43 'sinc':107 'span':46 'spars':166 'specif':81 'summar':134 'text':133 'text-summarization' 'token':143 'unclear':222 'unit':102 'usdc':15,30,64,104,108 'usdc api' 'usdc-base-network' 'use':109 'util':54,149 'valid':151,208 'validation' 'via':10,25,206 'wallet':179 'web3':138 'x402':11,26,35,94 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"aa3f4328-e807-4617-b005-774fec688030","listingId":"821e49f4-441b-4d98-9e97-43dc5f90bf23","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/343","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:19.872Z"}],"sources":[{"listingId":"821e49f4-441b-4d98-9e97-43dc5f90bf23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/343","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:19.872Z","lastSeenAt":"2026-04-22T18:04:32.122Z"}],"details":{"listingId":"821e49f4-441b-4d98-9e97-43dc5f90bf23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/343 \\\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 cost $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 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/343"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation utilities with micropayments instead of subscriptions","Exporting data or generating analytics reports with no upfront commitment"],"bestFor":["Developers who want zero-setup, keyless API access paid in USDC","Agents or bots that need programmatic pay-per-call access to diverse utility endpoints","Web3-native applications that prefer on-chain micropayments over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.257Z"},"updatedAt":"2026-04-22T18:04:32.122Z"}}