{"id":"27d3e9c9-fa3e-4a09-9a6a-a64a8c3d9042","shortId":"wsaHBd","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 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 required.\n\nThe specific endpoint at `/api/v1/carts/52` is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is settled on-chain via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second payment timeout.\n\nNote that while the landing page lists many endpoint paths across multiple categories, the crawled documentation, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The actual functionality behind the `/api/v1/carts/52` path and the other listed endpoints cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","sentiment-analysis","text-summarization","classification","embeddings","data-analytics","finance-data","geocoding","utility-apis"],"categories":["llm","finance","geo","data"],"synonyms":["micropayment API","pay-per-request API","x402 API","USDC API","Base network API","low fee API","crypto payment API"],"warnings":["No OpenAPI schema or detailed documentation available — all doc pages return only 'Connect wallet'","The specific endpoint /api/v1/carts/52 is labeled 'Premium API Access' with no description of what it actually returns","Cannot verify that the 16+ listed API endpoints actually function as described","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/52","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual functionality behind this specific cart endpoint and the other listed APIs is 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'/request':17,34 '0.02':16,33,106,158 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x8335':150 '20':143 '2913':151 '300':175 '6':154 'Base network API' 'USDC API' 'accept':133 'access':45,131 'across':189 'actual':225 'address':171 'advertis':63,139 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,111,130,196 'avail':223,241 'base':7,24,59,145,153 'base-network' 'behind':51,227 'cannot':236 'categori':65,191 'chain':164 'challeng':138 'classif':82 'classification' 'commit':119 'connect':204 'content':210 'contract':149 'convers':99 'crawl':193 'crypto payment API' 'data':9,26,68,72 'data-analytics' 'decim':155 'describ':127 'detail':221 'document':194,222 'embed':83 'embeddings' 'endpoint':14,31,50,102,123,187,235 'equal':157 'estim':93 'exact':168 'exampl':218 'exchang':88 'export':73 'feed':87 'financ':11,28,84 'finance-data' 'four':64 'function':226 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'geocoding' 'infrastructur':95 'insight':74 'key':112 'land':183 'learn':77 'limit':115 'list':185,234 'low fee API' 'lowpaymentfee.com':35 'machin':76 'mani':186 'marketplac':42 'materi':242 'maxamountrequir':141 'metric':70 'micropay':56 'micropayment API' 'minimum':118 'multipl':190 'network':60 'no-api-key' 'note':179 'offer':8,25 'on-chain':162 'openapi':214 'page':184,199 'path':188,230 'pay-per-request API' 'payment':159,177 'per':53,107 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':134 'premium':129 'price':86,104,195 'prompt':206 'protocol':40 'quot':91 'rate':89,114 'readm':198 'report':71 'request':54,108,135 'request/response':217 'requir':120 'return':201 'schema':215 'scheme':169 'second':176 'sentiment':78 'sentiment-analysis' 'settl':161 'specif':122 'summar':81 'text':80 'text-summarization' 'timeout':178 'token':90 'unit':146 'usdc':55,148 'usdc-micropayment' 'util':13,30,96 'utility-apis' 'valid':98 'varieti':48 'verifi':238 'via':165 'wallet':205 'web3':85 'x402':2,19,39,137,167 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d1bb0eca-40ff-47e4-a244-77e7d5cfb67a","listingId":"27d3e9c9-fa3e-4a09-9a6a-a64a8c3d9042","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:47.513Z"}],"sources":[{"listingId":"27d3e9c9-fa3e-4a09-9a6a-a64a8c3d9042","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:47.513Z","lastSeenAt":"2026-04-23T17:31:09.889Z"}],"details":{"listingId":"27d3e9c9-fa3e-4a09-9a6a-a64a8c3d9042","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/52 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/carts/52"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-call payment","Geocoding or data validation as a utility service paid per request","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["AI agents and bots that can settle x402 USDC payments on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, documentation, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.762Z"},"updatedAt":"2026-04-23T17:31:09.889Z"}}