{"id":"1938f70d-943e-4f76-b778-f230f3b5c65e","shortId":"fHEHDf","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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/93` is listed as \"Premium API Access\" and requires a POST request with an x402 payment header. The x402 challenge confirms the endpoint is live, accepting payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals).\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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint probed (`/api/v1/carts/93`) does not clearly map to any of the advertised API categories — it appears to be a cart resource, which is not documented on the landing page. 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, making it difficult to determine what this specific cart endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api","lowpaymentfee","low payment fee"],"warnings":["The endpoint path /api/v1/carts/93 does not match any of the advertised API categories on the landing page — its actual functionality is unknown.","No documentation is available: /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, request format, or response examples are provided anywhere.","The platform's advertised API categories (AI, analytics, finance, utilities) are unverifiable since no docs exist."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /api/v1/carts/93 path is not explained anywhere on the site. All doc pages return only 'Connect wallet' with no 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'/api/v1/carts/93':67,182 '/docs':211 '/pricing':213 '/readme':214 '/request':17,34 '0.02':16,33,109,162 '000':98 '0x8335':103 '20':97 '2913':104 '6':114 'accept':92 'access':45,73 'actual':252 'advertis':119,191 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,123,167,192 'appear':195 'avail':238 'base':7,24,61,99,106 'base network api' 'behind':51 'broader':117 'cart':199,250 'categori':121,193 'challeng':86 'classif':138 'clear':185 'commit':175 'confirm':87 'connect':219 'content':225 'convers':155 'data':9,26,124,128 'decim':115 'detail':236 'determin':246 'difficult':244 'document':204,209,237 'embed':139 'endpoint':14,31,50,65,89,158,180,241,251 'equal':108 'estim':149 'exampl':233 'exchang':144 'export':129 'feed':143 'financ':11,28,140 'four':120 'gas':148 'gate':3,20,44 'generat':156 'geocod':153 'header':83 'howev':177 'infrastructur':151 'insight':130 'json-response' 'key':168 'land':207 'learn':133 'limit':171 'list':69,160 'live':91 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'make':242 'map':186 'marketplac':42 'metric':126 'micropay':55 'micropayment api' 'minimum':174 'network':62 'offer':8,25 'openapi':229 'page':208,210 'pay-per-request api' 'payment':82,93 'per':53,110,163 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'post':77 'post-endpoint' 'premium':71 'price':142 'probe':181 'prompt':221 'protocol':40 'quot':147 'rate':145,170 'report':127 'request':54,78,111,164 'request/response':232 'requir':75,176 'resourc':200 'return':216,253 'schema':230 'sentiment':134 'settl':56 'specif':64,179,249 'substant':224 'summar':137 'text':136 'token':146 'unit':100 'usdc':58,102,112 'usdc api' 'usdc-base' 'use':113 'util':13,30,152 'valid':154 'varieti':48 'wallet':220 'web3':141 'x402':2,19,39,81,85 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"c54b4237-c637-48ef-832f-385e8be42f70","listingId":"1938f70d-943e-4f76-b778-f230f3b5c65e","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:37.344Z"}],"sources":[{"listingId":"1938f70d-943e-4f76-b778-f230f3b5c65e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:37.344Z","lastSeenAt":"2026-04-23T17:31:06.351Z"}],"details":{"listingId":"1938f70d-943e-4f76-b778-f230f3b5c65e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/93 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/carts/93"},{"claim":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with a low-cost endpoint for testing micropayment flows","Accessing miscellaneous data/AI/finance/utility endpoints via crypto micropayments"],"bestFor":["Developers experimenting with x402 protocol micropayments","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who want no-commitment API usage"],"notFor":["Production workloads requiring documented, well-specified API contracts","Users who need detailed request/response schemas before integration","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.142Z"},"updatedAt":"2026-04-23T17:31:06.351Z"}}