{"id":"2a8680ea-40ff-4cc4-9b62-92053318d6a5","shortId":"3pCvJK","kind":"x402","title":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","tagline":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every request costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/nfts/48` is listed as \"Premium API Access.\" Its x402 challenge advertises a max amount of 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 platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. No OpenAPI schema or detailed documentation was found beyond the landing page catalog, so the exact request/response shapes for `/api/v1/nfts/48` are unknown.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-base","nft-data","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["web3","data","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","nft api","crypto api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/nfts/48 is unknown — 'Premium API Access' is not descriptive","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The broad catalog of endpoints (AI, finance, analytics, etc.) all at identical $0.02 pricing with no documentation raises questions about actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/48","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/nfts/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation for request/response formats, and the purpose of /api/v1/nfts/48 specifically is entirely opaque beyond the generic label 'Premium API Access.' The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':174 '0.02':11,29,68,120,173 '000':109 '0x8335':114 '20':108 '2913':115 '300':133 '6':124 'accept':138 'access':99 'across':56 'advertis':103 'ai-inference' 'ai/ml':59 'also':146 'amount':106 'analysi':151 'analyt':58 'api':6,24,43,81,98 'application/json':143 'base':9,27,73,110,117 'base network api' 'beyond':185 'broad':48 'call':5,23,54 'catalog':49,189 'chain':78 'challeng':102 'classif':154 'classification' 'commit':89 'convers':166 'cost':67 'crypto api' 'crypto-quotes' 'data':57 'data-analytics' 'decim':125 'detail':181 'document':182 'embed':155 'embeddings' 'enabl':42 'endpoint':55,92,137,148 'equal':119 'estim':163 'everi':65 'exact':130,192 'exchang':158 'expos':147 'feed':157 'finance-data' 'finance/web3':61 'found':184 'gas':162 'generat':168 'geocod':164 'geocoding' 'given':121 'infer':60 'infrastructur':63 'key':15,33,82 'land':187 'limit':18,36,85 'list':95 'low payment fee' 'lowpaymentfee.com':37 'max':105 'micropayment api' 'network':74 'nft api' 'nft-data' 'offer':46 'on-chain':76 'openapi':178 'page':188 'pay':3,21,52 'pay per call api' 'pay-per-cal':2,20,51 'pay-per-call' 'payment':127 'per':4,22,53 'platform':7,25,44,145 'point':176 'post':139 'premium':97 'price':156,175 'quot':161 'rate':17,35,84,159 'request':13,31,66,140 'request/response':193 'return':142 'schema':179 'scheme':128 'second':134 'sentiment':150 'sentiment-analysis' 'settl':75 'shape':194 'specif':91 'summar':153 'text':152 'text-summarization' 'timeout':135 'token':160 'unit':111 'unknown':198 'upfront':88 'usdc':12,30,70,113,122 'usdc api' 'usdc-base' 'util':64 'utility-services' 'valid':165 'x402':1,19,41,101 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"6eeb9159-63f9-4b5b-ba97-9aa20ec28d6f","listingId":"2a8680ea-40ff-4cc4-9b62-92053318d6a5","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/nfts/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.059Z"}],"sources":[{"listingId":"2a8680ea-40ff-4cc4-9b62-92053318d6a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.059Z","lastSeenAt":"2026-04-22T04:02:47.617Z"}],"details":{"listingId":"2a8680ea-40ff-4cc4-9b62-92053318d6a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/48"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/48"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand NFT or crypto data without managing API keys","Programmatic access to AI inference (sentiment, summarization, classification) paid per call via USDC","Fetching real-time exchange rates or gas estimates with micropayments","Infrastructure utilities like geocoding or data validation without subscription overhead"],"bestFor":["AI agents and bots that can settle x402 payments autonomously","Developers who want zero-commitment, pay-as-you-go API access","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or OpenAPI schemas before integrating","Applications that cannot handle on-chain USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.872Z"},"updatedAt":"2026-04-22T04:02:47.617Z"}}