{"id":"435a3cff-908f-4a50-9c27-b3cc2f0f4453","shortId":"s3rQAU","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 are priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/168` is listed as \"Premium API Access\" and returns an x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD given 6 decimals). It accepts HTTP POST requests and responds with `application/json`. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind this particular resource ID (168) is unclear; the title \"Premium API Access\" is generic and does not describe what the endpoint returns. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-api"],"categories":["llm","data","finance","utility"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","crypto-paid api","on-demand api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The endpoint name 'Premium API Access' and resource ID 168 are opaque — actual functionality is unknown","No examples of request or response payloads available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/168","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/168","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 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint name 'Premium API Access' is generic with no indication of what resource/168 actually does. Effectively a stub 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'/api/v1/generate/resource/168':118 '/docs':178 '/pricing':179 '/readme':182 '/request':17,34 '0.02':16,33,90,140 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '168':217 '20':134 '300':170 '6':143 'accept':146 'access':124,224 'across':50 'actual':210 'address':161 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,105,123,223 'application/json':153 'avail':208 'awar':239 'base':7,24,98,136 'base network api' 'behind':212 'broad':46 'caller':236 'catalog':47 'categori':52 'chain':159 'challeng':129 'classif':66 'classification' 'commit':113 'connect':188 'contact':249 'content':194 'convers':83 'crypto-paid api' 'data':9,26,53 'data-analytics' 'decim':144 'describ':230 'document':173,203,242 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,49,86,116,233 'estim':77 'exact':165 'exampl':206 'exchang':72 'experiment':247 'export':57 'expos':44 'extrem':175 'feed':71 'financ':11,28,68 'finance-data' 'four':51 'function':211 'gas':76 'generat':84 'generic':226 'geocod':81 'geocoding' 'given':142 'http':147 'id':216 'infrastructur':79 'input/output':243 'insight':58 'integr':245 'key':106 'learn':61 'limit':109 'list':120 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'maxamountrequir':132 'metric':55 'micropayment api' 'network':99 'offer':8,25 'on-chain':157 'on-demand api' 'openapi':198 'page':183 'particular':214 'pay per call api' 'pay-per-request' 'payabl':3,20,93 'payload':207 'payment':154,166 'per':91 'platform':5,22,42 'post':148 'premium':122,222 'price':70,88 'prompt':190 'prospect':235 'protocol':103 'provid':251 'quot':75 'rate':73,108 'render':185 'report':56 'request':92,149 'request/response':201 'requir':246 'resourc':215 'respond':151 'return':126,234 'schema':202,244 'scheme':167 'second':171 'sentiment':62 'sentiment-analysis' 'settl':156 'spars':176 'spec':199 'specif':115 'summar':65 'text':64 'text-summarization' 'timeout':172 'titl':221 'token':74 'unclear':219 'unit':137 'upfront':112 'usd':141 'usdc':95,139 'usdc api' 'usdc-base' 'use':163 'util':13,30,80 'utility-api' 'valid':82 'via':100 'wallet':189 'web3':69 'without':241 'x402':2,19,39,102,128 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"8bc9ed5f-b6f0-4fe2-9298-773fd44876f6","listingId":"435a3cff-908f-4a50-9c27-b3cc2f0f4453","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:04.316Z"}],"sources":[{"listingId":"435a3cff-908f-4a50-9c27-b3cc2f0f4453","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:04.316Z","lastSeenAt":"2026-04-23T23:02:09.762Z"}],"details":{"listingId":"435a3cff-908f-4a50-9c27-b3cc2f0f4453","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/168 \\\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 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/168"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/168"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call crypto payment","Running data analytics queries (metrics, reports, insights) paid per request via x402","Utility operations like geocoding, validation, or data conversion with no subscription required"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring low-cost ($0.02) per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk requests where per-call payment overhead is impractical","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.056Z"},"updatedAt":"2026-04-23T23:02:09.762Z"}}