{"id":"9d794566-024a-47b9-9355-8f86e6f57571","shortId":"sRmvmQ","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 infrastructure utilities. Every endpoint is gated by the 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 at `/api/v1/collections/47` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings","classification"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-gated API","no-auth API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' — no public docs available without wallet connection.","The specific purpose of /api/v1/collections/47 ('Premium API Access') is unclear; no input/output schema is documented.","No OpenAPI spec or structured schema was found for any endpoint.","Platform appears to be a relatively new or small operation — no robots.txt, no agents.txt, minimal public information."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, no OpenAPI schema, no request/response examples, and all documentation pages behind a wallet-connect gate yield no usable content. The actual functionality behind 'collections/47' is opaque — 'Premium API Access' is a generic label with no 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'0.02':9,25,130,190 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':122 '20':116 '2913':123 '300':142 '6':126 'Base network API' 'USDC API' 'accept':105 'access':103 'account':89 'across':151 'addit':149 'address':138 'advertis':111,148 'ai':161 'ai-inference' 'ai/ml':49 'amount':114 'analysi':165 'analyt':48,155 'api':4,20,45,86,102 'appear':197 'attach':66 'avail':211 'base':7,23,72,118,125 'broader':146 'call':44 'caller':65 'categori':153 'challeng':64,110 'classif':168 'classification' 'collect':5,21 'connect':202 'convers':184 'crawl':214 'crypto-gated API' 'data':47,52,154,158 'data-analytics' 'decim':127 'detail':206 'document':193 'embed':169 'embeddings' 'endpoint':57,95,150 'equal':129 'estim':179 'everi':56 'exchang':174 'exist':195 'export':159 'feed':173 'financ':170 'finance-data' 'finance/web3':51 'four':152 'gas':178 'gate':3,19,59 'generat':185 'geocod':182 'geocoding' 'header':79 'host':34 'immedi':84 'infer':50 'infrastructur':54,181 'insight':160 'key':15,31,87 'learn':163 'limit':92 'list':99 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':162 'maximum':113 'metric':156 'micropayment API' 'network':73 'no-api-key' 'no-auth API' 'page':194 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':63,69,78,134 'per':10,26,43,131,191 'platform':147 'post':106 'premium':101 'price':172,188 'protocol':40 'quot':177 'rate':91,175 'receiv':81 'report':157 'request':11,27,107,132,192 'request/response':207 'requir':16,32,199 'respons':83 'schema':208 'second':143 'sent':136 'sentiment':164 'sentiment-analysis' 'span':46 'specif':94 'suit':36 'summar':167 'text':166 'text-summarization' 'timeout':144 'token':176 'unit':119 'usdc':13,29,68,121 'usdc-base' 'util':55 'valid':183 'view':204 'wallet':201 'web3':171 'web3-data' 'x':77 'x-payment':76 'x402':2,18,39,62,109 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"bb48ca8b-4cfb-4f79-a895-74ff9977a393","listingId":"9d794566-024a-47b9-9355-8f86e6f57571","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:46.994Z"}],"sources":[{"listingId":"9d794566-024a-47b9-9355-8f86e6f57571","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:46.994Z","lastSeenAt":"2026-04-22T02:31:45.982Z"}],"details":{"listingId":"9d794566-024a-47b9-9355-8f86e6f57571","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/47"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/47"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits","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 needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto gas estimates or token price quotes with per-call USDC payment","Running geocoding or data validation as a utility service from an autonomous agent","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents with Base USDC wallets that need frictionless, keyless API access","Developers prototyping multi-service workflows without signing up for multiple providers","Low-volume or bursty workloads where $0.02/request flat pricing is cost-effective"],"notFor":["High-volume production workloads where per-request crypto payment overhead is impractical","Users without a Base-network USDC wallet or x402-compatible client","Applications requiring detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.718Z"},"updatedAt":"2026-04-22T02:31:45.982Z"}}