{"id":"6cf6789a-6058-49f1-b045-85266939ae20","shortId":"QTEa3K","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 variety 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 use the x402 payment protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/item/50` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment of up to 20,000 units of USDC (0x8335... on Base). The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. However, the purpose and payload of this particular `/item/50` endpoint is unclear — the site's landing page lists many named endpoints but does not specifically document this one, and the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the crawled documentation pages are effectively empty and there is no OpenAPI spec, the actual request/response schema for this endpoint is unknown. The site advertises $0.02 per request across its listed endpoints, but the 402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 (in the asset's smallest unit), which would need to be interpreted in the context of USDC's 6 decimal places — equating to $0.02. The platform appears live and functional based on the 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","x402"],"synonyms":["low payment fee","x402 api","pay-per-call api","USDC api","Base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) return no useful content — only 'Connect wallet' prompts","The specific endpoint /api/v1/item/50 is not listed among the named endpoints on the landing page; its purpose is unknown","No OpenAPI spec or request/response schema available; request body format must be guessed","No information about what data this endpoint actually returns after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/50","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/item/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but documentation pages are empty (only 'Connect wallet' prompts). No OpenAPI spec, no request/response schema, and the specific /api/v1/item/50 endpoint is not documented on the landing page. The purpose of this particular endpoint is 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'/item/50':164 '/request':17,34 '0.02':16,33,229,272 '000':131,248 '0x8335':135 '20':130,247 '300':145 '402':123,238,282 '402 payment api' '6':267 'Base network api' 'USDC api' 'accept':95,150 'access':119 'across':49,232 'actual':218 'advertis':228 'ai':10,27,58 'analysi':62 'analyt':53 'api':4,21,41,100,118,188 'appear':275 'application/json':155 'asset':251 'base':7,24,93,137,279 'base-network' 'categori':51 'challeng':124,239,283 'classif':65 'commit':107 'connect':196 'content':202 'context':263 'convers':82 'crawl':205 'data':9,26,52 'decim':268 'doc':186 'document':181,206 'effect':209 'embed':66 'empti':210 'enabl':40 'endpoint':14,31,48,85,111,149,165,176,223,235,242 'equat':270 'estim':76 'exact':142 'exchang':71 'export':56 'expos':44 'feed':70 'financ':11,28,67 'four':50 'function':278 'gas':75 'generat':83 'geocod':80 'howev':156 'infrastructur':78 'insight':57 'interpret':260 'json-api' 'key':101 'land':171 'learn':60 'limit':104 'list':115,173,234 'live':276 'low payment fee' 'lowpaymentfee.com':35 'machin':59 'mani':174 'maxamountrequir':245 'metric':54 'micropayment api' 'name':175 'need':257 'network':94 'no-api-key' 'offer':8,25 'one':183 'openapi':215 'page':172,191,207 'particular':163 'pay-per-call api' 'pay-per-request' 'payabl':3,20 'payload':160 'payment':89,97,126,139 'per':230 'place':269 'platform':5,22,42,274 'post':151 'post-method' 'premium':117 'price':69,187 'prompt':198 'protocol':90 'purpos':158 'quot':74 'rate':72,103 'readm':190 'report':55 'request':125,152,231 'request/response':219 'requir':108 'respons':284 'return':121,154,193 'schema':220 'scheme':140 'second':146 'sentiment':61 'show':243 'site':169,227 'smallest':253 'spec':216 'specif':110,180 'substant':201 'summar':64 'text':63 'timeout':147 'token':73 'unclear':167 'unit':132,254 'unknown':225 'usdc':96,134,265 'usdc-payment' 'use':86 'util':13,30,79 'valid':81 'varieti':46 'wallet':197 'web3':68 'would':256 'x402':2,19,39,88 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"d522a74c-0ce8-43a3-ae7b-8a7166d2b181","listingId":"6cf6789a-6058-49f1-b045-85266939ae20","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/item/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:49.483Z"}],"sources":[{"listingId":"6cf6789a-6058-49f1-b045-85266939ae20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:49.483Z","lastSeenAt":"2026-04-23T20:01:19.324Z"}],"details":{"listingId":"6cf6789a-6058-49f1-b045-85266939ae20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/50\n# Returns 402 with X-PAYMENT challenge\n# Supply X-PAYMENT header with valid x402 payment proof to access the resource","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/item/50","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network payments","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge shows maxAmountRequired of 20000 USDC units on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/item/50"}],"useCases":["Agents paying per-request for API access without needing API keys or subscriptions","Programmatic access to data, AI, finance, or utility endpoints via x402 micropayments","Web3-native applications consuming APIs with on-chain USDC payments on Base"],"bestFor":["AI agents that need keyless, pay-per-use API access","Developers wanting to test x402 payment flows on Base","Applications requiring low-friction, no-signup API consumption"],"notFor":["Users needing detailed API documentation or OpenAPI specs (docs are currently empty)","High-volume use cases where per-request pricing may be cost-prohibitive","Anyone requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:02:26.389Z"},"updatedAt":"2026-04-23T20:01:19.324Z"}}