{"id":"de2313ca-be53-418a-900b-c225792cbeae","shortId":"LMdweV","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/carts/27` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a max amount of 20,000 units (0.02 USDC given 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme.\n\nThe broader platform advertises four categories of APIs: 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality behind `/api/v1/carts/27` is unclear — the endpoint path suggests a cart resource rather than one of the documented API categories. Documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment-gated","usdc-base-network","pay-per-request","no-api-key","json-response","on-chain-settlement"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","The endpoint path /api/v1/carts/27 does not match any of the documented API categories on the homepage","No OpenAPI or schema describing request parameters or response format","Actual functionality behind this endpoint is unknown without making a paid request","No way to verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/27","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/27","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 well-formed, confirming the endpoint exists and accepts USDC on Base. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of /api/v1/carts/27 is ambiguous. The platform lists many endpoints but provides no detail on any of 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'/api/v1/carts/27':56,161 '/docs':181 '/pricing':183 '/readme':184 '/request':16,32 '0.02':15,31,78,142 '000':76 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':91 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':69 '20':75 '402 payment API' '6':81 'Base network API' 'USDC API' 'accept':64 'access':62 'actual':229 'address':90 'advertis':99 'ai':9,25,111 'amount':73 'analysi':115 'analyt':8,24,105 'api':4,20,42,61,103,147,177 'avail':208 'base':7,23,51 'behind':160 'broader':97 'call':41 'cart':169 'categori':101,178 'chain':88 'challeng':214 'classif':118 'collect':36 'commit':155 'confirm':221 'connect':189 'content':195 'contract':68 'convers':135 'data':104,108 'decim':82 'detail':206 'document':176,179,207 'embed':119 'endpoint':13,29,43,55,138,165,211,223 'estim':129 'exact':94 'exampl':203 'exchang':124 'export':109 'feed':123 'financ':10,26,120 'form':220 'four':100 'function':159 'gas':128 'gate':3,19,44 'generat':136 'geocod':133 'given':80 'host':34 'howev':156 'infrastructur':131 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'x402-payment-gated'","prices":[{"id":"061809f3-8497-4a06-a877-b9c059892394","listingId":"de2313ca-be53-418a-900b-c225792cbeae","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/27","description":"Premium API 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required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/carts/27","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network with maxAmountRequired of 20000","source_url":"https://lowpaymentfee.com/api/v1/carts/27"},{"claim":"Platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to pay-per-call endpoints without traditional API key management","Agent-driven API consumption with on-chain USDC micropayments on Base","Exploring x402 protocol integration for automated machine-to-machine payments"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented, stable API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T10:03:40.25Z"},"updatedAt":"2026-04-23T20:01:20.829Z"}}