{"id":"918ae1d0-f8cf-42f4-8394-02b9c577a732","shortId":"HyVP4M","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 the x402 payment challenge: callers attach a USDC payment on Base in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint at `/api/v1/collections/34` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 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 pricing model across all listed 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","premium-api-access"],"categories":["api-gateway","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment required API"],"warnings":["No API documentation available — all doc/pricing/README pages return only 'Connect wallet' with no technical content.","The specific purpose and expected request/response format of /api/v1/collections/34 is unknown; 'Premium API Access' is the only description.","No OpenAPI or schema provided; request body and response structure must be discovered by trial.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/34","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/34","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 spec, no request/response schema, no documentation beyond the landing page, and the purpose of '/collections/34' specifically is undefined. This is effectively a stub 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'/request':142 '0.02':9,25,126,141 '000':114 '0x8335':120 '20':113 '2913':121 '402 payment required API' '6':131 'Base network API' 'USDC micropayment API' 'accept':103 'access':101 'account':87 'across':145 'advertis':109,152 'ai':164 'ai/ml':49 'analysi':168 'analyt':48,158 'api':4,20,45,84,100 'attach':66 'base':7,23,71,115,123 'beyond':192 'broader':150 'call':44 'caller':65 'categori':156 'challeng':64,108 'classif':171 'collect':5,21,213 'confirm':138 'connect':199 'contract':119 'convers':188 'crypto-gated API' 'data':47,52,157,161 'decim':132 'detail':206 'document':190 'embed':172 'endpoint':57,93,148,153,214 'equal':125 'estim':182 'everi':56 'exchang':177 'export':162 'feed':176 'financ':173 'finance/web3':51 'flat':140 'four':155 'gas':181 'gate':3,19,59 'generat':189 'geocod':186 'header':77 'host':34 'immedi':82 'infer':50 'infrastructur':184 'insight':163 'key':15,31,85 'land':136,194 'learn':166 'limit':90 'list':97,147 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':165 'maxamountrequir':111 'metric':159 'model':144 'no-api-key' 'page':137,191,195 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':63,69,76 'per':10,26,43,127 'platform':151 'post':104 'post-endpoint' 'premium':99 'premium-api-access' 'price':143,175 'prompt':201 'protocol':40 'quot':180 'rate':89,178 'receiv':79 'report':160 'request':11,27,105,128 'request/response':208 'requir':16,32 'respons':81 'return':196 'schema':209 'sentiment':167 'servic':55 'site':134 'span':46 'specif':92,212 'suit':36 'summar':170 'technic':205 'text':169 'token':179 'unit':116 'unknown':216 'usdc':13,29,68,118,129 'usdc-base' 'use':130 'util':54,185 'valid':187 'wallet':200 'web3':174 'x':75 'x-payment':74 'x402':2,18,39,62,107 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"9c3f9eb7-9e5f-4ebc-b075-6d23d6efac19","listingId":"918ae1d0-f8cf-42f4-8394-02b9c577a732","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:52.872Z"}],"sources":[{"listingId":"918ae1d0-f8cf-42f4-8394-02b9c577a732","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:52.872Z","lastSeenAt":"2026-04-22T04:02:21.142Z"}],"details":{"listingId":"918ae1d0-f8cf-42f4-8394-02b9c577a732","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/34 \\\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":"Flat $0.02 per request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/34"},{"claim":"Available endpoint categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to a bundled collection of data, AI, finance, and utility endpoints via a single payment protocol","Demonstrating or testing x402 payment flows on Base with low-cost USDC transactions"],"bestFor":["Developers building x402-native agent workflows","Low-volume, pay-as-you-go API consumption without signup","Quick prototyping against multiple endpoint categories (analytics, AI, finance, utils)"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discount documented)","Users who need detailed API documentation or guaranteed SLAs (docs pages are empty)","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.494Z"},"updatedAt":"2026-04-22T04:02:21.142Z"}}