{"id":"8cb1b622-0ecd-489a-8580-cc879d81e648","shortId":"Cdu3Wu","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 pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/generate/resource/80` is listed under \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment scheme is \"exact\" with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input/output schemas, and data sources behind these endpoints remain undocumented and unverifiable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only a 'Connect wallet' prompt.","No OpenAPI spec or input/output schema is available for any endpoint.","The actual functionality of /api/v1/generate/resource/80 ('Premium API Access') is completely undocumented.","The broader catalog of 16+ endpoints is advertised but none have verifiable documentation or schemas.","Cannot confirm what data sources or models back the AI and finance endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/80","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/generate/resource/80","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 confirms pricing and payment details, but all documentation pages return only 'Connect wallet' with no content. There is no OpenAPI spec, no input/output schema, no example requests or responses, and no description of what 'Premium API Access' at resource/80 actually returns. The listing is effectively a 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'/api/v1/generate/resource/80':89 '/docs':170 '/pricing':171 '/readme':173 '/request':13,28 '0.02':12,27,65,126 '000':122 '0x8335':112 '20':121 '2913':113 '300':139 '402 payment api' '6':130 'accept':103 'access':95 'actual':187 'advertis':145 'ai-inference' 'ai/ml':53 'amount':119 'analysi':149 'analyt':52 'api':5,20,37,77,94 'base':8,23,73,115,123 'base network api' 'behavior':188 'behind':194 'broad':42 'broader':143 'call':4,19 'catalog':43 'challeng':98 'classif':152 'classification' 'commit':83 'confirm':99 'connect':178 'content':184 'contract':111 'convers':164 'crypto-data' 'data':51,56,192 'data-analytics' 'decim':131 'document':168 'embed':153 'embeddings' 'enabl':36 'endpoint':49,61,87,146,196 'estim':161 'exact':136 'exchang':156 'feed':155 'finance-data' 'finance/web3':55 'gas':160 'generat':166 'geocod':162 'geocoding' 'given':127 'howev':167 'i.e':125 'infer':54 'input/output':189 'key':78 'limit':80 'list':91 'live':102 'low payment fee' 'lowpaymentfee.com':31 'max':118 'micropayment api' 'network':9,24,74 'offer':40 'page':169 'paid':68 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payment':108,133 'per':3,18,47,66 'platform':6,21,38,144 'post':104 'premium':93 'price':63,154 'prompt':180 'quot':159 'rate':79,157 'remain':197 'request':48,67,105 'requir':84 'return':175 'schema':190 'scheme':134 'second':140 'sentiment':148 'sentiment-analysis' 'servic':59 'settl':107 'sourc':193 'span':50 'specif':86 'substant':183 'summar':151 'text':150 'text-summarization' 'timeout':141 'token':158 'undocu':198 'unit':124 'unverifi':200 'upfront':82 'usdc':15,30,70,110,128 'usdc api' 'usdc-base' 'util':58 'utility-services' 'valid':163 'via':10,25 'wallet':179 'x402':11,26,35,97 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d896166e-be35-40bf-b6ba-f0b768ef95b6","listingId":"8cb1b622-0ecd-489a-8580-cc879d81e648","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/generate/resource/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:45.353Z"}],"sources":[{"listingId":"8cb1b622-0ecd-489a-8580-cc879d81e648","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:45.353Z","lastSeenAt":"2026-04-23T21:31:45.800Z"}],"details":{"listingId":"8cb1b622-0ecd-489a-8580-cc879d81e648","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/80"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/80"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Running geocoding, validation, or data conversion utilities with per-call billing"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse utility endpoints","Developers prototyping with low-cost per-request pricing and no commitments","Web3-native applications already operating on the Base network"],"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":"2026-02-17T23:14:40.867Z"},"updatedAt":"2026-04-23T21:31:45.800Z"}}