{"id":"b13d9986-cf0a-4046-9f74-911cf74bcf74","shortId":"2TsWD2","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated 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, 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 are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/claims/66` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\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 usage examples available from the crawled material. It is unclear what specific data or functionality the `/api/v1/claims/66` endpoint returns, as the \"Premium API Access\" label is generic. The broader platform catalog is visible on the landing page but individual endpoint behavior must be inferred.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","crypto-paid api"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) are empty — only show 'Connect wallet'","No OpenAPI or schema available for any endpoint","The specific purpose and response format of /api/v1/claims/66 is undocumented","The broader catalog lists many endpoints but none have documented request/response schemas","Cannot verify that listed AI/finance/utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/66","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/claims/66","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, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of /api/v1/claims/66 specifically is unclear beyond the generic 'Premium API Access' 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'/api/v1/claims/66':118,217 '/docs':173 '/pricing':174 '/readme':177 '/request':17,34 '0.02':16,33,91,146 '000':135 '0x8335':140 '20':134 '2913':141 '300':157 '402':129 'accept':162 'access':124,224 'across':50 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,106,123,223 'application/json':167 'avail':203 'base':7,24,99,136,143 'base usdc api' 'behavior':241 'broad':46 'broader':229 'catalog':47,231 'categori':52 'challeng':130 'cheap api access' 'classif':67 'commit':114 'connect':183 'content':189 'convers':84 'crawl':206 'crypto-paid api' 'crypto-quotes' 'data':9,26,53,57,213 'data-analytics' 'document':168,198 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,117,161,218,240 'equal':145 'estim':78 'exact':153 'exampl':202 'exchang':73 'export':58 'expos':44 'extrem':170 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':215 'gas':77 'gas-estimates' 'gate':3,20 'generat':85 'generic':227 'geocod':82 'geocoding' 'http':163 'individu':239 'infer':244 'infrastructur':80 'insight':59 'key':107 'label':225 'land':236 'learn':62 'limit':110 'list':120 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':149 'materi':207 'metric':55 'micropayment api' 'must':242 'network':100 'offer':8,25 'openapi':193 'page':178,237 'paid':94 'pay per call api' 'pay-per-request' 'payment':147 'per':92 'platform':5,22,42,230 'post':164 'premium':122,222 'price':71,89 'prompt':185 'protocol':104 'quot':76 'rate':74,109 'render':180 'report':56 'request':93,131 'request/response':196 'return':126,166,219 'schema':197 'scheme':154 'second':158 'sentiment':63 'sentiment-analysis' 'spars':171 'spec':194 'specif':116,212 'summar':66 'text':65 'text-classification' 'text-summarization' 'timeout':159 'token':75 'unclear':210 'unit':137 'upfront':113 'usag':201 'usdc':96,139 'usdc-base' 'util':13,30,81 'valid':83,128 'validation' 'via':101,150 'visibl':233 'wallet':184 'web3':70 'x402':2,19,39,103,152 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1bc72659-37a9-4fb0-b952-bd6a8bf98a1d","listingId":"b13d9986-cf0a-4046-9f74-911cf74bcf74","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/claims/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:01.553Z"}],"sources":[{"listingId":"b13d9986-cf0a-4046-9f74-911cf74bcf74","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:01.553Z","lastSeenAt":"2026-04-23T05:01:11.917Z"}],"details":{"listingId":"b13d9986-cf0a-4046-9f74-911cf74bcf74","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/66 \\\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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/66"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/66"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayment","Running geocoding, validation, or data conversion tasks on a per-request payment basis","Exporting data or generating analytics reports with no subscription commitment","Agent-driven workflows that need low-friction, wallet-authenticated API access"],"bestFor":["Developers or agents wanting pay-per-use API access without signup or API keys","Web3-native applications that can settle payments in USDC on Base","Prototyping and low-volume usage where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs, documentation, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.84Z"},"updatedAt":"2026-04-23T05:01:11.917Z"}}