{"id":"ef092816-dd74-4290-8940-b122270ed684","shortId":"r8ghgf","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 at `/api/v1/collections/40` is listed as \"Premium API Access.\" The x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment settles to address 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. Documentation pages exist but appear to require a wallet connection and contain no visible content beyond that prompt, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method","premium-api-access"],"categories":["api-gateway","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","no-key API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt with no visible content — no schemas or usage instructions available.","The specific purpose and input/output format of /api/v1/collections/40 is unknown; 'Premium API Access' is the only description provided.","No OpenAPI spec or output schema beyond the basic x402 challenge metadata.","Cannot verify what data or functionality this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/40","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/40","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response payloads, and the purpose of the 'collections/40' endpoint is entirely opaque beyond the label 'Premium API Access.' This is effectively a stub 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'0.02':9,25,125,196 '000':113 '0x1a2b':137 '0x8335':119 '20':112 '2913':120 '300':141 '6':130 '85f3':138 'Base network API' 'USDC micropayment API' 'accept':146 'access':103 'account':89 'across':158 'addit':156 'address':136 'advertis':107,155 'ai':167 'ai/ml':49 'analysi':171 'analyt':48,162 'api':4,20,45,86,102 'appear':203 'application/json':151 'asset':118 'attach':66 'base':7,23,72,114,122 'beyond':214 'broader':153 'call':44 'caller':65 'categori':160 'challeng':64,106 'classif':174 'collect':5,21 'connect':208 'contain':210 'content':213 'convers':190 'cost':110 'crypto-gated API' 'data':47,52,161 'decim':131 'detail':218 'document':199 'embed':175 'endpoint':57,95,145,157 'equal':124 'estim':185 'everi':56 'exchang':180 'exist':201 'export':165 'feed':179 'financ':176 'finance/web3':51 'four':159 'gas':184 'gate':3,19,59 'generat':191 'geocod':188 'header':79 'host':34 'immedi':84 'infer':50 'infrastructur':187 'insight':166 'json-response' 'key':15,31,87 'learn':169 'limit':92 'list':99 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':168 'maximum':109 'metric':163 'network':73 'no-api-key' 'no-key API' 'page':200 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':63,69,78,133 'per':10,26,43,126,197 'platform':154 'post':147 'post-method' 'premium':101 'premium-api-access' 'price':178,194 'prompt':216 'protocol':40 'quot':183 'rate':91,181 'receiv':81 'report':164 'request':11,27,127,148,198 'request/response':219 'requir':16,32,205 'respons':83 'return':150 'schema':220 'second':142 'sentiment':170 'servic':55 'settl':134 'span':46 'specif':94 'suit':36 'summar':173 'text':172 'timeout':143 'token':182 'unavail':222 'unit':115 'usdc':13,29,68,117,128 'usdc-base' 'use':129 'util':54 'valid':189 'visibl':212 'wallet':207 'web3':177 'x':77 'x-payment':76 'x402':2,18,39,62,105 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"cafb2dcb-5dd4-4552-9656-7d075899a8ef","listingId":"ef092816-dd74-4290-8940-b122270ed684","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:55.234Z"}],"sources":[{"listingId":"ef092816-dd74-4290-8940-b122270ed684","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:55.234Z","lastSeenAt":"2026-04-22T04:02:21.251Z"}],"details":{"listingId":"ef092816-dd74-4290-8940-b122270ed684","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/40"},{"claim":"All endpoints are priced at $0.02 per request 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 asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/40"}],"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","Micropayment-gated API calls settled in USDC on Base L2"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients that can attach USDC payments on Base","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or OpenAPI schemas before integrating","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.323Z"},"updatedAt":"2026-04-22T04:02:21.251Z"}}