{"id":"f5c9c31c-a19c-4b75-a8e1-4bd902bd10b9","shortId":"V38hv5","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 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/25` 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). Since USDC uses 6 decimals, this converts to $0.02 per request, consistent with the site's uniform $0.02 pricing across all endpoints.\n\nThe broader platform advertises endpoints in 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). Documentation pages beyond the landing page returned only a \"Connect wallet\" stub, so detailed request/response schemas, parameter descriptions, and example payloads are not available. The actual functionality behind `/api/v1/collections/25` is unclear — it may be a bundle or gateway to the listed collection of APIs, but this is not documented.","tags":[],"capabilities":["x402-payment-gated","pay-per-request","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-gateway","ai","finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API marketplace"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content.","No OpenAPI or schema available — request parameters and response format for /api/v1/collections/25 are unknown.","The purpose of '/collections/25' specifically (vs. individual endpoints like /ai/sentiment) is unclear; it may be a meta-endpoint or bundle.","No agents.txt or robots.txt found on the origin."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but documentation pages are empty stubs ('Connect wallet' only). There is no OpenAPI spec, no request/response schema, no examples, and the purpose of the /collections/25 endpoint specifically is undocumented. The listing is essentially a stub with confirmed 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'infer':50 'infrastructur':181 'insight':160 'key':15,31,87 'land':191 'learn':163 'limit':92 'list':98,227 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':162 'maxamountrequir':112 'may':219 'metric':157 'network':73 'no-api-key' 'page':188,192 'paramet':203 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payload':207 'payment':63,69,78 'per':10,26,43,134 'platform':149 'post':105 'premium':100 'price':143,172 'protocol':40 'quot':177 'rate':91,175 'receiv':81 'report':158 'request':11,27,106,135 'request/response':201 'requir':16,32 'respons':83 'return':193 'schema':202 'sentiment':164 'sentiment-analysis' 'serverless API marketplace' 'servic':55 'sinc':125 'site':139 'span':46 'specif':94 'stub':198 'suit':36 'summar':167 'text':166 'text-summarization' 'token':176 'unclear':217 'uniform':141 'unit':117 'usdc':13,29,68,119,126 'usdc-base-network' 'use':127 'util':54,182 'utility-services' 'valid':184 'wallet':197 'web3':171 'x':77 'x-payment':76 'x402':2,18,39,62,108 'x402 API' 'x402-gated':1,17 'x402-payment-gated' 'x402-protocol':38","prices":[{"id":"bf3199d3-653a-4b13-b3e3-1e3d6a16cd93","listingId":"f5c9c31c-a19c-4b75-a8e1-4bd902bd10b9","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T23:59:54.175Z"}],"sources":[{"listingId":"f5c9c31c-a19c-4b75-a8e1-4bd902bd10b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T23:59:54.175Z","lastSeenAt":"2026-04-22T02:31:45.660Z"}],"details":{"listingId":"f5c9c31c-a19c-4b75-a8e1-4bd902bd10b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/25 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/25"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' stub content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["AI agents making ad-hoc API calls without pre-registering for keys","Paying per request for sentiment analysis or text summarization","Fetching real-time crypto gas estimates or token quotes on demand","Running geocoding or data export tasks with instant USDC settlement"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are overkill","Crypto-native workflows that can attach x402 USDC payments on Base"],"notFor":["High-volume production workloads where per-request crypto payments add overhead","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.062Z"},"updatedAt":"2026-04-22T02:31:45.660Z"}}