{"id":"cf0bfad0-21f1-4e5f-b43c-4a907c2e01f0","shortId":"A9Pzs6","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/61` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The payment asset is USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals).\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 $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access — payment is handled entirely through the x402 protocol header.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/carts/61` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind this specific cart ID is unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific endpoint /api/v1/carts/61 has no description beyond 'Premium API Access'; its actual functionality is unknown","No OpenAPI schema or request/response examples are provided anywhere","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/61","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of /api/v1/carts/61 is undefined. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/carts/61':64,215 '/docs':183 '/pricing':185 '/readme':187 '/request':17,34 '0.02':16,33,102,154 '000':97 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':88 '20':96 '402':224 '6':106 'Base network API' 'USDC API access' 'accept':72 'access':44,70,168 'across':113 'actual':217,229 'advertis':111 'ai':10,27,123 'amount':94 'analysi':127 'analyt':117 'api':4,21,40,69,161 'asset':84 'base':7,24,58,90,98 'base-network' 'behind':50,231 'broader':109 'captur':226 'cart':234 'categori':115 'challeng':225 'classif':130 'confirm':222 'connect':193 'content':199 'contract':87 'convers':147 'data':9,26,116,120 'decim':107 'detail':210 'document':178,211 'embed':131 'emphas':159 'endpoint':14,31,49,62,112,150,216,220 'entir':172 'equal':101 'estim':141 'exact':80 'exampl':207 'exchang':136 'export':121 'extrem':180 'feed':135 'financ':11,28,132 'four':114 'function':230 'gas':140 'gate':3,20,43 'generat':148 'geocod':145 'handl':171 'header':177 'id':235 'infrastructur':143 'insight':122 'instant':167 'json-response' 'key':162 'learn':125 'limit':165 'list':66,152 'live':223 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'marketplac':41 'maximum':93 'metric':118 'micropay':55 'micropayment API' 'network':59 'no-api-key' 'offer':8,25 'openapi':203 'page':188 'pay-per-request API' 'payment':76,83,169 'per':52,155 'per-request':51 'per-request-billing' 'platform':5,22,110,158 'post':73 'post-endpoint' 'premium':68 'price':134 'prompt':195 'protocol':39,176 'quot':139 'rate':137,164 'render':190 'report':119 'request':53,74,156 'request/response':206 'return':218 'schema':204 'scheme':81 'sentiment':126 'spars':181 'specif':61,233 'substant':198 'summar':129 'text':128 'token':138 'unclear':237 'unit':99 'usd':103 'usdc':54,86,104 'usdc-micropayment' 'use':105 'util':13,30,144 'valid':146 'varieti':47 'via':77 'wallet':194 'web3':133 'x402':2,19,38,79,175 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"c3d6939b-5e67-488b-99d7-5237215a121c","listingId":"cf0bfad0-21f1-4e5f-b43c-4a907c2e01f0","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:24.572Z"}],"sources":[{"listingId":"cf0bfad0-21f1-4e5f-b43c-4a907c2e01f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:24.572Z","lastSeenAt":"2026-04-23T12:05:07.367Z"}],"details":{"listingId":"cf0bfad0-21f1-4e5f-b43c-4a907c2e01f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/61 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/carts/61"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/61"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.013Z"},"updatedAt":"2026-04-23T12:05:07.367Z"}}