{"id":"949b0a20-cff0-47ec-9dec-1d140eaf97b9","shortId":"NzgNur","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is gated by an x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint `/api/v1/collections/10` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The site's landing page confirms a flat $0.02/request price across all endpoints.\n\nThe broader platform advertises endpoints in 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). Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for this specific collection endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.","The specific purpose of /api/v1/collections/10 is not described anywhere; 'Premium API Access' is a generic label.","No information on uptime, SLAs, or data freshness guarantees."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/10","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/collections/10","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, but there is no OpenAPI schema, no documentation beyond a landing page, and no example request/response bodies. The purpose of the '/collections/10' endpoint specifically is unclear beyond the generic label 'Premium API Access'. Effectively a stub 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'/request':143 '0.02':9,25,127,142 '000':116 '0x8335':121 '20':115 '2913':122 '6':132 'Base network API' 'USDC API' 'accept':104 'access':102 'account':89 'across':145 'advertis':110,151 'ai':163 'ai/ml':49 'analysi':167 'analyt':48,157 'api':4,20,45,86,101 'attach':66 'base':7,23,72,117,124 'beyond':191 'broader':149 'call':44 'caller':65 'categori':155 'challeng':64,109 'classif':170 'collect':5,21,212 'confirm':139 'connect':198 'convers':187 'cost':113 'data':47,52,156,160 'decim':133 'detail':205 'document':189 'embed':171 'endpoint':57,95,147,152,213 'equal':126 'estim':181 'everi':56 'exchang':176 'export':161 'feed':175 'financ':172 'finance/web3':51 'flat':141 'four':154 'gas':180 'gate':3,19,59 'generat':188 'geocod':185 'header':79 'host':34 'immedi':84 'infer':50 'infrastructur':183 'insight':162 'json-response' 'key':15,31,87 'land':137,193 'learn':165 'limit':92 'list':98 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':164 'maximum':112 'metric':158 'micropayment API' 'network':73 'no-api-key' 'page':138,190,194 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':63,69,78 'per':10,26,43,128 'platform':150 'post':105 'post-endpoint' 'premium':100 'price':144,174 'prompt':200 'protocol':40 'quot':179 'rate':91,177 'receiv':81 'report':159 'request':11,27,106,129 'request/response':207 'requir':16,32 'respons':83 'return':195 'schema':208 'sentiment':166 'servic':55 'site':135 'span':46 'specif':94,211 'suit':36 'summar':169 'technic':204 'text':168 'token':178 'unit':118 'unknown':215 'usdc':13,29,68,120,130 'usdc-base' 'use':131 'util':54,184 'valid':186 'wallet':199 'web3':173 'x':77 'x-payment':76 'x402':2,18,39,62,108 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"07a621fb-69bf-40cf-8b9c-d23485f0a234","listingId":"949b0a20-cff0-47ec-9dec-1d140eaf97b9","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/collections/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T20:29:37.073Z"}],"sources":[{"listingId":"949b0a20-cff0-47ec-9dec-1d140eaf97b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T20:29:37.073Z","lastSeenAt":"2026-04-22T05:31:54.669Z"}],"details":{"listingId":"949b0a20-cff0-47ec-9dec-1d140eaf97b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/10 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/10"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/10"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to a bundle of data, AI, finance, and utility endpoints via a single payment protocol","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["AI agents with x402-compatible wallets looking for frictionless API consumption","Developers prototyping x402 payment integrations on Base","Use cases requiring small, one-off API calls without subscription commitments"],"notFor":["High-volume batch workloads where per-request micropayments add up quickly","Users who need detailed API documentation or guaranteed SLAs","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.518Z"},"updatedAt":"2026-04-22T05:31:54.669Z"}}