{"id":"1bec4e12-410e-4861-8771-2339b645f9b9","shortId":"x5dMVQ","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 via the x402 protocol.\n\nThe specific endpoint at `/api/v1/carts/2` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 units of USDC (0.02 USDC, 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual behavior and response format of the `/api/v1/carts/2` endpoint is unknown beyond the x402 challenge metadata. The endpoint name \"Premium API Access\" and the path segment \"carts/2\" suggest it may be a shopping cart or catalog resource, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"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 api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint '/api/v1/carts/2' purpose is unclear — 'Premium API Access' is a generic label","No examples of successful responses are available anywhere in the crawled material","Cannot verify what data or functionality this specific endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/2","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/2","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 works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of the specific '/api/v1/carts/2' endpoint is unclear. This is effectively a stub 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'/api/v1/carts/2':111,207 '/docs':168 '/pricing':169 '/readme':172 '/request':17,34 '0.02':16,33,93,131 '000':127 '20':126 '402':121 '402 payment api' '6':133 'access':117,157,221 'across':49 'actual':200 'advertis':155 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,116,147,220 'avail':198 'base':7,24,101 'base network api' 'behavior':201 'beyond':211 'call':91,136 'cart':233 'carts/2':226 'catalog':235 'categori':51 'challeng':122,214 'classif':66 'classification' 'commit':162 'connect':178 'content':184 'convers':83 'crypto-quotes' 'data':9,26,52,56 'data-analytics' 'decim':134 'document':163,193 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,109,208,217 'estim':77 'exact':143 'exampl':197 'exchang':72 'export':57 'expos':44 'extrem':165 'feed':71 'financ':11,28,68 'finance-data' 'format':204 'four':50 'gas':76 'gate':3,20 'generat':84 'geocod':81 'geocoding' 'infrastructur':79 'insight':58 'instant':156 'key':148 'learn':61 'limit':151 'list':113 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':139 'marketplac':42 'may':229 'metadata':215 'metric':54 'micropayment api' 'minimum':160 'name':218 'network':102 'offer':8,25 'openapi':188 'page':173 'path':224 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payment':137 'per':90,94,135 'platform':5,22,154 'premium':115,219 'price':70 'prompt':180 'protocol':106 'quot':75 'rate':73,150 'render':175 'report':55 'request':95,123 'request/response':191 'requir':152 'resourc':236 'respons':203 'return':119 'schema':192 'scheme':144 'segment':225 'sentiment':62 'sentiment-analysis' 'settl':96 'shop':232 'spars':166 'spec':189 'specif':108 'specul':240 'suggest':227 'summar':65 'text':64 'text-summarization' 'token':74 'unit':128 'unknown':210 'usag':196 'usdc':98,130,132 'usdc api' 'usdc-base' 'util':13,30,80 'utility-apis' 'valid':82 'varieti':46 'via':103,140 'wallet':179 'web3':69 'x402':2,19,39,105,142,213 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fc7c22e4-5866-4427-aeef-5c77b2d4ed21","listingId":"1bec4e12-410e-4861-8771-2339b645f9b9","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:11.097Z"}],"sources":[{"listingId":"1bec4e12-410e-4861-8771-2339b645f9b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:11.097Z","lastSeenAt":"2026-04-23T22:01:42.318Z"}],"details":{"listingId":"1bec4e12-410e-4861-8771-2339b645f9b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/2 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 (0.02 USDC) with exact scheme on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/2"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/2"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data and crypto quotes with per-request micropayments","Using utility services like geocoding and data validation on a pay-as-you-go basis","Integrating x402-compatible agents with a multi-category API marketplace"],"bestFor":["Agents and developers wanting zero-signup, pay-per-call API access","x402-native workflows that settle in USDC on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs, rate limit guarantees, or support","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.394Z"},"updatedAt":"2026-04-23T22:01:42.318Z"}}