{"id":"557a392c-820e-419b-b103-782712012118","shortId":"jzAYyB","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a variety of 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 utilities (geocoding, validation, conversion, generation). All endpoints are pay-per-call at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/carts/85` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 units (0.02 USDC given 6-decimal USDC) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP POST and returns `application/json`. No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The purpose of the `/api/v1/carts/85` endpoint specifically is unclear; it does not map to any of the named API categories on the landing page, so its actual functionality is unknown.","tags":[],"capabilities":["x402-payment-gating","usdc-base-settlement","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The endpoint path /api/v1/carts/85 does not correspond to any of the named APIs on the landing page; its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) are effectively empty, showing only 'Connect wallet'.","No OpenAPI spec or request/response schema is available; request format and response structure must be guessed.","The platform appears to be a generic x402 demo or early-stage project with minimal real documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/85","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/carts/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific purpose of /api/v1/carts/85 is undocumented. No OpenAPI spec, no request/response schemas, and all documentation pages render only a wallet-connect prompt. The landing page lists many endpoints but provides no technical detail beyond names and 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'/request':17,34 '0.02':16,33,93,126 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '20':123 '402 payment required' '6':129 'accept':145 'access':113,159 'across':49 'actual':235 'addit':188 'address':136 'advertis':158 'ai':10,27,59 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':63 'analyt':53 'api':4,21,41,112,152,174,227 'application/json':150 'avail':204 'base':7,24,101 'base network api' 'call':91,133 'categori':51,228 'challeng':119 'classif':66 'connect':183 'content':208 'convers':83 'conversion' 'crawl':207 'crypto-gas-estimates' 'data':9,26,52,56 'data-analytics' 'decim':130 'detail':190 'doc':173 'document':168,199 'embed':67 'enabl':40 'endpoint':14,31,48,86,105,144,214 'entir':162 'estim':77 'exact':140 'exampl':203 'exchang':72 'exchange-rates' 'export':57 'expos':44 'extrem':170 'feed':71 'financ':11,28,68 'finance-price-feeds' 'four':50 'function':236 'gas':76 'gate':3,20,161 'generat':84 'geocod':81 'geocoding' 'given':128 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'x402-gated':1,18 'x402-payment-gating'","prices":[{"id":"b2db9492-b476-4cfb-a415-c7766a571100","listingId":"557a392c-820e-419b-b103-782712012118","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/carts/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:15.294Z"}],"sources":[{"listingId":"557a392c-820e-419b-b103-782712012118","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:15.294Z","lastSeenAt":"2026-04-23T22:01:42.436Z"}],"details":{"listingId":"557a392c-820e-419b-b103-782712012118","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/85 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/85 requests up to 20000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/carts/85"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages all render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding or data validation on a per-call payment basis","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.191Z"},"updatedAt":"2026-04-23T22:01:42.436Z"}}