{"id":"da57e404-917f-40dc-8d32-9dc19496a013","shortId":"Fz4PBK","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/33` 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 equals $0.02 per request, consistent with the site-wide pricing of $0.02/request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe provider's landing page lists 16 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 identically at $0.02. Documentation pages (/docs, /pricing, /api, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this collection endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","web3-data","infrastructure-utils"],"categories":["api-marketplace","data","llm"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content.","Request and response schemas for /api/v1/collections/33 are completely unknown; callers must experiment.","The meaning of 'collections/33' is unclear — it may be a bundle endpoint or a specific resource; no description beyond 'Premium API Access'.","No SLA, uptime guarantees, or contact information found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/33","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/33","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 of request/response formats, no examples, and all doc pages return only 'Connect wallet'. The purpose of '/collections/33' specifically is opaque — it could be a bundle or a single resource. Effectively a stub 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'/api/v1/collections/33':97 '/docs':208 '/pricing':209 '/readme':211 '/request':145 '0.02':9,25,133,144,205 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':122 '16':163 '20':115 '2913':123 '300':154 '6':129 'Base network API' 'USDC API' 'accept':105 'access':103 'account':89 'across':165 'actual':224 'address':150 'advertis':111 'ai':175 'ai-inference' 'ai/ml':49 'analysi':179 'analyt':48,169 'api':4,20,45,86,102 'attach':66 'base':7,23,72,117,125 'call':44 'caller':65 'categori':167 'challeng':64,110 'classif':182 'collect':5,21,229 'connect':215 'consist':136 'content':221 'contract':121 'convers':198 'crypto-paid API' 'data':47,52,168,172 'data-analytics' 'decim':130 'document':206 'embed':183 'endpoint':57,95,164,230 'equal':132 'estim':193 'everi':56 'exchang':188 'export':173 'feed':187 'financ':184 'finance-data' 'finance/web3':51 'four':166 'gas':192 'gate':3,19,59 'generat':199 'geocod':196 'header':79 'host':34 'ident':203 'immedi':84 'infer':50 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'x402':2,18,39,62,109 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"5f324112-ef18-4ee5-b1e3-3007b60fd558","listingId":"da57e404-917f-40dc-8d32-9dc19496a013","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:29:49.677Z"}],"sources":[{"listingId":"da57e404-917f-40dc-8d32-9dc19496a013","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:29:49.677Z","lastSeenAt":"2026-04-22T08:31:58.809Z"}],"details":{"listingId":"da57e404-917f-40dc-8d32-9dc19496a013","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/33 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/33"},{"claim":"Site-wide pricing is $0.02 per request with no minimums, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand data or AI inference without managing API keys or subscriptions","Programmatic access to analytics, sentiment analysis, or financial data with per-call USDC payments","Web3 applications that want to consume utility APIs (geocoding, validation, conversion) settled on-chain"],"bestFor":["Developers or agents already holding USDC on Base who want frictionless API access","Low-volume or bursty workloads where pay-per-call at $0.02 is cheaper than a subscription","Autonomous agents that can sign x402 payments without human intervention"],"notFor":["High-volume production workloads where $0.02/call adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.991Z"},"updatedAt":"2026-04-22T08:31:58.809Z"}}