{"id":"666dc0eb-ce03-4b59-a3e6-8fe6d48f7ba8","shortId":"5ngwzN","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints. The specific endpoint at `/api/v1/carts/26` is listed as \"Premium API Access\" and accepts payment in USDC on the Base network. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys, rate limits, or subscriptions are required — each call is paid individually via an on-chain USDC micropayment.\n\nThe broader platform advertises 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific `/api/v1/carts/26` endpoint lacks detailed documentation about what it actually returns. The crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description beyond the generic \"Premium API Access\" label. The endpoint is live (returns a valid 402 challenge), but its actual functionality is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","pay-per-use endpoint"],"warnings":["The actual functionality of /api/v1/carts/26 ('Premium API Access') is not documented anywhere in the crawled material","No OpenAPI schema or request/response examples are available","Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no substantive content","The endpoint path '/carts/26' suggests a shopping-cart or e-commerce resource but no details confirm this"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/26","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/carts/26 is completely undocumented. The docs/pricing/API pages all render only 'Connect wallet' with no useful 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'/call':13,30 '/request':168 '0.02':12,29,95,167 '000':86 '20':85 '402':227 '6':91 'Base network API' 'USDC pay-per-call' 'accept':69 'access':51,67,218 'across':124 'actual':182,231 'advertis':122 'ai':134 'amount':83 'analysi':138 'analyt':128 'api':5,15,22,32,42,66,99,189,217 'avail':236 'base':8,25,75,87 'beyond':213 'broader':120 'call':108 'categori':126 'chain':116 'challeng':79,228 'classif':141 'connect':195 'content':201 'convers':158 'crawl':185 'data':127,131 'decim':92 'descript':212 'detail':177 'doc':186 'document':178 'embed':142 'endpoint':56,59,123,161,175,221 'equal':94 'estim':152 'exampl':209 'exchang':147 'export':132 'feed':146 'financ':143 'four':125 'function':232 'gas':151 'gate':50 'generat':159 'generic':215 'geocod':156 'howev':171 'http-post' 'indic':80 'individu':111 'infrastructur':154 'insight':133 'json-response' 'key':16,33,100 'label':219 'lack':176 'learn':136 'limit':102 'list':63,163 'live':223 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'materi':237 'maximum':82 'metric':129 'micropay':118 'micropayment API' 'network':76 'no-api-key' 'on-chain':114 'openapi':205 'page':190 'paid':110 'pay':2,19,39 'pay-per-request':1,18,38 'pay-per-use endpoint' 'payment':70 'per':3,20,40,96 'platform':6,23,43,121 'point':170 'premium':65,216 'price':145,169,187 'prompt':197 'protocol':48 'quot':150 'rate':101,148 'render':192 'report':130 'request':4,21,41,97 'request/response':208 'requir':17,34,106 'return':183,224 'schema':206 'sentiment':137 'specif':58,173 'subscript':104 'summar':140 'text':139 'token':149 'unclear':234 'unit':88 'usdc':9,26,72,90,117 'usdc-base-network' 'use':45 'util':155 'valid':157,226 'varieti':54 'via':10,27,112 'wallet':196 'web3':144 'x402':11,28,47,78 'x402 API' 'x402-payment'","prices":[{"id":"fc3de57f-440c-4486-b62f-4a201d60da29","listingId":"666dc0eb-ce03-4b59-a3e6-8fe6d48f7ba8","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:52.580Z"}],"sources":[{"listingId":"666dc0eb-ce03-4b59-a3e6-8fe6d48f7ba8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:52.580Z","lastSeenAt":"2026-04-23T09:00:47.473Z"}],"details":{"listingId":"666dc0eb-ce03-4b59-a3e6-8fe6d48f7ba8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/26 \\\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 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/26"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/26"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic purchasing of API responses without subscriptions"],"bestFor":["Developers who want to pay per call without API key management","AI agents with x402-compatible wallets on Base","Users who need low-cost, commitment-free API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.51Z"},"updatedAt":"2026-04-23T09:00:47.473Z"}}