{"id":"ba96767f-bcd0-4cf3-9453-5cf642071715","shortId":"f2rtmX","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-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The platform organizes its offerings into 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/carts/63` is listed as \"Premium API Access\" and returns a valid x402 challenge over POST. The challenge advertises a maximum amount of 20,000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02 USD — consistent with the site's uniform pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The x402 version is 1 and the scheme is \"exact\".\n\nNote that the `/api/v1/carts/63` path does not clearly map to any of the named API categories on the landing page, and the description \"Premium API Access\" is generic. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown. Without documentation or OpenAPI specs, it is unclear what data this specific endpoint returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee","low payment fee","x402 micropayment endpoint","crypto api gateway"],"warnings":["The /api/v1/carts/63 path does not correspond to any named endpoint on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available for this or any endpoint on the platform.","The generic 'Premium API Access' description provides no insight into what data or service this endpoint delivers."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/63","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/63","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 confirms uniform $0.02 pricing. However, the specific /api/v1/carts/63 path has no documentation, no OpenAPI schema, no example requests/responses, and all doc pages return only 'Connect wallet'. The endpoint description is entirely generic ('Premium API Access') with no indication of what it actually 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'/docs':223 '/pricing':224 '/readme':225 '/request':17,34 '0.02':16,33,107,163 '000':149 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x8335':155 '1':187 '20':148 '2913':156 '300':180 '6':159 'access':45,132,218 'actual':239 'address':176 'advertis':143 'ai':10,27,76 'ai-inference' 'amount':146 'analysi':80 'analyt':70 'api':4,21,41,112,131,207,217 'base':7,24,59,150,158 'base usdc api' 'base-network' 'behind':51 'beyond':266 'categori':68,208 'challeng':138,142 'classif':83 'clear':200 'commit':120 'connect':230 'consist':165 'content':236 'contract':154 'convers':100 'crypto api gateway' 'data':9,26,69,73,256 'data-analytics' 'decim':160 'descript':215 'document':221,248 'embed':84 'embeddings' 'endpoint':14,31,50,103,124,244,259 'equal':162 'estim':94 'exact':192 'exchang':89 'expect':265 'export':74 'feed':88 'financ':11,28,85 'finance-data' 'four':67 'gas':93 'gate':3,20,44 'generat':101 'generic':220 'geocod':98 'geocoding' 'infrastructur':96 'input':263 'insight':75 'key':113 'land':211 'learn':78 'limit':116 'list':128 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':77 'map':201 'marketplac':42 'maximum':145 'metric':71 'micropay':56 'micropayment api' 'minimum':119 'name':206 'network':60 'no-api-key' 'note':193 'offer':8,25,65 'openapi':250 'organ':63 'page':212,222 'path':197 'pay-per-request api' 'payment':172 'per':53,108 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':140,268 'premium':130,216 'price':87,105,171 'prompt':232 'protocol':40 'quot':92 'rate':90,115 'report':72 'request':54,109,269 'request/response':240 'requir':121 'return':134,227,260 'schema':241 'scheme':190 'second':181 'sent':174 'sentiment':79 'sentiment-analysis' 'site':168 'spec':251 'specif':123,258 'substant':235 'summar':82 'text':81 'text-summarization' 'timeout':182 'token':91 'unclear':254 'uniform':170 'unit':151 'unknown':246 'usd':164 'usdc':55,153 'usdc-micropayment' 'util':13,30,97 'utility-apis' 'valid':99,136 'varieti':48 'version':185 'wallet':231 'web3':86 'without':247 'x402':2,19,39,137,184 'x402 api' 'x402 micropayment endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"49b6453d-5ec8-4cc6-a5f8-52dbc1fedaee","listingId":"ba96767f-bcd0-4cf3-9453-5cf642071715","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:29.179Z"}],"sources":[{"listingId":"ba96767f-bcd0-4cf3-9453-5cf642071715","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:29.179Z","lastSeenAt":"2026-04-23T09:00:46.526Z"}],"details":{"listingId":"ba96767f-bcd0-4cf3-9453-5cf642071715","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/63 \\\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 no minimums.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/63 advertises maxAmountRequired of 20000 base units of USDC on Base (6 decimals = $0.02).","source_url":"https://lowpaymentfee.com/api/v1/carts/63"},{"claim":"Payment is to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/carts/63"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/carts/63"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayment","Running utility operations (geocoding, validation, conversion) on a pay-per-use basis","Integrating agent-purchasable API calls into autonomous workflows using x402 protocol"],"bestFor":["AI agents that need keyless, pay-per-call API access on Base","Developers prototyping with low-cost, no-commitment API endpoints","Web3-native applications that prefer on-chain payment settlement"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime (no documentation on reliability)","Users who need detailed API documentation or OpenAPI schemas before integration","Applications requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.723Z"},"updatedAt":"2026-04-23T09:00:46.526Z"}}