{"id":"3499ae24-01c6-4ed5-aa52-81b81277f5ba","shortId":"AQHH7r","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/96` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader site offers endpoints across 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 listed endpoints share the same $0.02/request pricing.\n\nHowever, the specific `/api/v1/carts/96` endpoint's purpose is unclear — the path suggests a cart resource (ID 96), but the description is simply \"Premium API Access\" with no further documentation. The docs, pricing, and API pages on the site returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI schema or detailed documentation available for this endpoint","The purpose of /api/v1/carts/96 ('Premium API Access') is not explained — the path suggests a cart resource but no further context is provided","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","No request body schema or response schema is documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/96","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /api/v1/carts/96 resource is unexplained. The docs pages returned only wallet-connect prompts with no 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'/request':17,34,159 '0.02':16,33,86,158 '000':80 '20':79 '96':177 'Base network API' 'USDC API' 'access':45,71,100,185 'across':116 'advertis':91 'ai':10,27,126 'analysi':130 'analyt':120 'api':4,21,41,70,93,184,194 'attach':103 'avail':221 'base':7,24,59,81 'base-network' 'behind':51 'broader':112 'call':88 'caller':101 'cart':174 'categori':118 'classif':133 'connect':202 'content':208 'convers':150 'crawl':224 'data':9,26,119,123 'descript':180 'detail':219 'doc':191 'document':189,220 'embed':134 'endpoint':14,31,50,63,115,154,165 'estim':144 'exampl':216 'exchang':139 'export':124 'feed':138 'financ':11,28,135 'four':117 'gas':143 'gate':3,20,44 'generat':151 'geocod':148 'header':107 'howev':161 'i.e':85 'id':176 'infrastructur':146 'insight':125 'instant':99 'json-response' 'key':94 'learn':128 'limit':97 'list':67,153 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':127 'marketplac':42 'metric':121 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25,114 'openapi':212 'page':195 'path':171 'pay-per-request API' 'payment':75,106 'per':53,87 'per-request':52 'per-request-billing' 'platform':5,22,90 'post-method' 'premium':69,183 'price':137,160,192 'prompt':204 'protocol':40 'purpos':167 'quot':142 'rate':96,140 'report':122 'request':54,110 'request/response':215 'requir':73 'resourc':175 'return':199 'schema':213 'sentiment':129 'share':155 'simpli':102,182 'site':113,198 'specif':62,163 'substant':207 'suggest':172 'summar':132 'text':131 'token':141 'unclear':169 'unit':82 'usdc':55,84 'usdc-micropayment' 'util':13,30,147 'valid':149 'varieti':48 'wallet':203 'web3':136 'x402':2,19,39,105 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"fc688cda-0071-428c-bf5d-39bb63bb5019","listingId":"3499ae24-01c6-4ed5-aa52-81b81277f5ba","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:58.405Z"}],"sources":[{"listingId":"3499ae24-01c6-4ed5-aa52-81b81277f5ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:58.405Z","lastSeenAt":"2026-04-23T12:05:09.006Z"}],"details":{"listingId":"3499ae24-01c6-4ed5-aa52-81b81277f5ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/96 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/96"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/96"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Exploring x402 protocol integration for automated micro-transactions"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless API access with crypto micropayments","Low-volume consumers who prefer pay-per-request over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.347Z"},"updatedAt":"2026-04-23T12:05:09.006Z"}}