{"id":"9bd1287e-9c87-46cb-8552-7d19e51b06a8","shortId":"TNRCab","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 specific endpoint at `/api/v1/carts/88` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call via the x402 exact payment scheme. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid payment proof to access the resource.\n\nThe broader platform organizes its endpoints 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 uniformly priced at $0.02 per request. Payments settle in USDC on the Base L2 network to the address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nNote that the specific `/api/v1/carts/88` path does not clearly map to any of the documented API categories on the landing page. Documentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","finance","geo","utility"],"synonyms":["low payment fee","x402 api marketplace","micropayment api","pay-per-request api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["The /api/v1/carts/88 path does not correspond to any documented endpoint on the landing page — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, no request/response schemas, and no usage examples are available.","No information about uptime, rate limits, or data freshness is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/88","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/88","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/carts/88 path is not explained in any crawled content. Effectively a stub with minimal usable integration 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'/request':17,34 '0.02':16,33,85,167 '000':80 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':182 '20':79 '402 payment api' 'access':45,71,117 'addit':228 'address':181 'advertis':102 'ai':10,27,136 'ai-inference' 'analysi':140 'analyt':130 'api':4,21,41,70,96,198,214 'attach':105 'avail':244 'base':7,24,59,81,176 'base usdc api' 'base-network' 'behind':51 'beyond':205 'broader':121 'call':88 'caller':103 'categori':128,199 'classif':143 'classification' 'clear':191 'connect':223 'convers':159 'crawl':247 'data':9,26,129,133 'data-analytics' 'detail':230 'doc':213 'document':197,204,239 'embed':144 'embeddings' 'endpoint':14,31,50,63,125,162 'estim':154 'exact':92 'exampl':243 'exchang':149 'export':134 'extrem':210 'feed':148 'financ':11,28,145 'finance-data' 'four':127 'gas':153 'gate':3,20,44 'generat':160 'geocod':157 'geocoding' 'header':110 'infrastructure/utilities':156 'insight':135 'key':97 'l2':177 'land':202,207 'learn':138 'limit':100 'list':67 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':137 'map':192 'marketplac':42 'materi':248 'metric':131 'micropay':56 'micropayment api' 'network':60,178 'no-api-key' 'note':183 'offer':8,25 'openapi':234 'organ':123 'page':203,208,218 'path':188 'pay-per-request api' 'payment':75,93,109,114,170 'per':53,87,168 'per-request':52 'per-request-billing' 'platform':5,22,122 'premium':69 'price':147,165,215 'prompt':225 'proof':115 'protocol':40 'quot':152 'rate':99,150 'readm':217 'render':220 'report':132 'request':54,169 'request/response':237 'requir':73 'resourc':119 'schema':238 'scheme':94 'sentiment':139 'sentiment-analysis' 'settl':171 'simpli':104 'spec':235 'specif':62,186 'summar':142 'technic':229 'text':141 'text-summarization' 'thin':211 'token':151 'uniform':164 'unit':82 'usag':242 'usd':86 'usdc':55,84,173 'usdc-micropayment' 'util':13,30 'utility-apis' 'valid':113,158 'varieti':48 'via':89 'wallet':224 'web3':146 'x':108 'x-payment':107 'x402':2,19,39,91 'x402 api marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"18d22173-d532-45bf-b2af-d072a6f8b485","listingId":"9bd1287e-9c87-46cb-8552-7d19e51b06a8","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:52.435Z"}],"sources":[{"listingId":"9bd1287e-9c87-46cb-8552-7d19e51b06a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:52.435Z","lastSeenAt":"2026-04-23T14:00:42.288Z"}],"details":{"listingId":"9bd1287e-9c87-46cb-8552-7d19e51b06a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/88 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/carts/88"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Payments are directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/carts/88"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription commitments","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with micropayments","Exporting data or generating analytics reports via pay-per-use endpoints"],"bestFor":["Agents or applications that need occasional API calls without managing API keys or subscriptions","Developers experimenting with multiple API categories at very low per-request cost","Crypto-native workflows already operating on the Base network with USDC"],"notFor":["High-volume production workloads where per-request micropayment overhead is impractical","Users who need detailed API documentation, request/response schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.664Z"},"updatedAt":"2026-04-23T14:00:42.288Z"}}