{"id":"7d4cb20c-6d26-4017-9e2d-ff0ed5e5514f","shortId":"LmLLsG","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/7` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the endpoint returns JSON.\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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nNote that the specific functionality behind `/api/v1/carts/7` is not documented beyond the label \"Premium API Access.\" The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation or schema details. Without sending a paid request, the actual response payload and behavior of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","402 payment required","premium api access"],"warnings":["The specific functionality of /api/v1/carts/7 ('Premium API Access') is undocumented — the actual response payload is unknown without making a paid request.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The platform lists many endpoints across categories but none have detailed documentation visible from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/7","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/7","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 documentation, no OpenAPI schema, no example request/response, and the actual functionality behind /api/v1/carts/7 is completely opaque. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/request':17,34 '0.02':16,33,78,164 '000':82 '20':81 '402 payment required' '6':88 'access':45,73,193 'actual':221 'addit':209 'address':112 'advertis':121 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,41,72,125,169,192,198 'attach':99 'base':7,24,61,83 'base usdc api' 'behavior':225 'behind':51,183 'beyond':188 'broader':119 'call':80 'caller':98 'categori':123 'classif':140 'commit':177 'connect':204 'convers':157 'cost':75 'data':9,26,126,130 'decim':89 'detail':214 'doc':195 'document':187,211 'embed':141 'endpoint':14,31,50,65,115,160,228 'estim':151 'exact':96 'exchang':146 'export':131 'feed':145 'financ':11,28,142 'four':122 'function':182 'gas':150 'gate':3,20,44 'generat':158 'geocod':155 'handl':92 'header':104 'infrastructur':153 'insight':132 'json':117 'json-response' 'key':170 'label':190 'learn':135 'limit':173 'list':69 'low payment fee' 'lowpaymentfee.com':35 'machin':134 'marketplac':42 'metric':128 'micropay':55 'micropayment api' 'minimum':176 'network':62 'no-api-key' 'no-rate-limit' 'note':178 'offer':8,25 'page':199 'paid':218 'pay-per-call api' 'payload':223 'payment':90,103,108 'payto':111 'per':53,79,165 'per-request':52 'per-request-micropayment' 'platform':5,22,120 'premium':71,191 'premium api access' 'price':144,162,196 'prompt':206 'protocol':40 'quot':149 'rate':147,172 'remain':229 'render':201 'report':129 'request':54,166,219 'respons':222 'return':116 'schema':213 'scheme':97 'send':216 'sentiment':136 'settl':56 'sign':107 'specif':64,181 'summar':139 'technic':210 'text':138 'token':148 'unit':84 'unknown':230 'usdc':58,86 'usdc-base' 'util':13,30,154 'valid':156 'varieti':48 'via':93 'wallet':205 'web3':143 'without':215 'x':102 'x-payment':101 'x402':2,19,39,95 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"99d86bd0-b088-412d-972f-40638c4f5796","listingId":"7d4cb20c-6d26-4017-9e2d-ff0ed5e5514f","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:11.242Z"}],"sources":[{"listingId":"7d4cb20c-6d26-4017-9e2d-ff0ed5e5514f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:11.242Z","lastSeenAt":"2026-04-23T16:30:38.878Z"}],"details":{"listingId":"7d4cb20c-6d26-4017-9e2d-ff0ed5e5514f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/7 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/carts/7"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval where per-call billing is preferred over subscriptions","Testing x402 protocol integrations with a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol on Base","AI agents needing keyless, pay-per-use API access","Low-volume consumers who want no subscription commitment"],"notFor":["High-volume production workloads where per-request payment overhead is impractical","Users who need detailed API documentation or guaranteed SLAs before purchasing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.654Z"},"updatedAt":"2026-04-23T16:30:38.878Z"}}