{"id":"2bd9a85b-0007-40d4-85bc-8d998501fc8e","shortId":"6JJSSr","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/90` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 units of USDC (0x8335…2913 on Base) via the \"exact\" payment scheme. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\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 exact purpose of the `/api/v1/carts/90` endpoint (as opposed to the other listed endpoints) is unclear from the available material. The maxAmountRequired of 20,000 USDC units likely corresponds to $0.02 (assuming 6-decimal USDC), consistent with the site's advertised pricing.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","json-api"],"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 OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/carts/90 ('Premium API Access') is not listed among the site's advertised APIs — its purpose is unclear","No request body schema or response schema is documented anywhere","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/90","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/90","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, and the landing page lists available APIs with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/carts/90 is undocumented. This is effectively a stub 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'/api/v1/carts/90':107,198 '/docs':162 '/pricing':163 '/readme':166 '/request':17,34 '0.02':16,33,93,223 '000':124,217 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':128 '20':123,216 '2913':129 '300':146 '402 payment api' '6':225 'accept':151 'access':113 'across':49 'address':142 'advertis':233 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,112 'application/json':156 'assum':224 'avail':192,211 'base':7,24,101,131 'base network api' 'call':91 'categori':51 'challeng':119 'classif':66 'classification' 'connect':172 'consist':228 'content':178 'convers':83 'correspond':221 'crypto-quotes' 'data':9,26,52,56 'data-analytics' 'decim':226 'direct':140 'document':157,187 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,105,150,199,206 'estim':77 'exact':134,194 'exampl':191 'exchang':72 'export':57 'expos':44 'extrem':159 'feed':71 'financ':11,28,68 'finance-data' 'four':50 'gas':76 'gate':3,20 'generat':84 'geocod':81 'geocoding' 'http':152 'infrastructur':79 'insight':58 'json-api' 'learn':61 'like':220 'list':109,205 'live':117 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'marketplac':42 'materi':212 'maxamountrequir':214 'metric':54 'micropayment api' 'network':102 'offer':8,25 'openapi':182 'oppos':201 'page':167 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payment':135,138 'per':90,94 'platform':5,22 'post':153 'premium':111 'price':70,234 'prompt':174 'purpos':195 'quot':75 'rate':73 'render':169 'report':55 'request':95,120 'request/response':185 'return':115,155 'schema':186 'scheme':136 'second':147 'sentiment':62 'sentiment-analysis' 'settl':96 'site':231 'spars':160 'spec':183 'specif':104 'summar':65 'text':64 'text-summarization' 'timeout':148 'token':74 'unclear':208 'unit':125,219 'usag':190 'usdc':98,127,218,227 'usdc api' 'usdc-base' 'util':13,30,80 'valid':82 'varieti':46 'via':132 'wallet':173 'web3':69 'x402':2,19,39,118 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"2c37b18d-6dc7-4c3d-bafc-de5f8b209e5c","listingId":"2bd9a85b-0007-40d4-85bc-8d998501fc8e","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:14.708Z"}],"sources":[{"listingId":"2bd9a85b-0007-40d4-85bc-8d998501fc8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:14.708Z","lastSeenAt":"2026-04-23T22:01:42.438Z"}],"details":{"listingId":"2bd9a85b-0007-40d4-85bc-8d998501fc8e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/90 \\\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 site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/90"},{"claim":"Documentation pages /docs, /pricing, /api, and /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data and crypto quotes on a per-request basis","Running geocoding or data validation utilities with micropayments","Exporting analytics data or generating reports via pay-as-you-go calls"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.178Z"},"updatedAt":"2026-04-23T22:01:42.438Z"}}