{"id":"e8d27bae-0498-474c-9e62-32c493656cc9","shortId":"9MJ25D","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace offering a broad set of 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint listed here — `/api/v1/carts/35` — is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header with a signed payment proof. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, 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 example payloads available. The purpose of the `/api/v1/carts/35` resource specifically is unclear; it does not map to any of the advertised API categories on the homepage, so its actual functionality is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api marketplace","pay-per-call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The endpoint path /api/v1/carts/35 does not match any of the advertised API categories on the homepage; its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no technical content.","The provider site lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific /api/v1/carts/35 resource doesn't correspond to any advertised API category. All doc pages beyond the landing page are empty wallet-connect 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'/api/v1/carts/35':112,217 '/docs':181 '/pricing':182 '/readme':185 '/request':16,32 '0.02':15,31,88,139 '000':128 '0x8335':133 '20':127 '2913':134 '402 payment required' '6':143 'accept':167 'access':117 'across':47 'actual':238 'addit':196 'advertis':230 'ai':9,25,57 'ai-inference' 'analysi':61 'analyt':8,24,51 'api':4,20,39,100,116,231 'application/json':172 'avail':212 'base':7,23,96,129,136 'base network api' 'beyond':174 'broad':43 'categori':49,232 'challeng':123 'classif':64 'classification' 'commit':105 'connect':191 'convers':81 'data':50,54 'data-analytics' 'decim':144 'detail':198 'document':173,207 'embed':65 'embeddings' 'endpoint':13,29,46,84,109,166 'equal':138 'estim':75 'exact':151 'exampl':210 'exchang':70 'export':55 'feed':69 'financ':10,26,66 'finance-data' 'four':48 'function':239 'gas':74 'gate':3,19 'generat':82 'geocod':79 'geocoding' 'given':140 'header':159 'homepag':235 'includ':154 'infrastructur':77 'insight':56 'key':101 'label':114 'land':176 'learn':59 'limit':103 'list':110 'live':121 'low payment fee' 'lowpaymentfee.com':33 'machin':58 'made':147 'map':225 'marketplac':40 'metric':52 'micropayment api' 'network':97 'offer':41 'openapi':202 'page':177,186 'paid':91 'pay-per-call api' 'pay-per-request' 'payload':211 'payment':145,158,163 'per':89 'post':168 'premium':115 'price':68,86 'prompt':193 'proof':164 'protocol':38 'purpos':214 'quot':73 'rate':71,102 'render':188 'report':53 'request':90,124,169 'request/response':205 'requir':106 'resourc':218 'return':119,171 'schema':206 'scheme':152 'sentiment':60 'sentiment-analysis' 'set':44 'sign':162 'spars':179 'spec':203 'specif':108,219 'suit':5,21 'summar':63 'technic':197 'text':62 'text-summarization' 'token':72 'unclear':221 'unit':130 'unknown':241 'usdc':93,132,141 'usdc api' 'usdc-base' 'util':12,28,78 'utility-apis' 'valid':80 'via':148 'wallet':192 'web3':67 'x':157 'x-payment':156 'x402':2,18,37,122,150 'x402 api marketplace' 'x402-gated':1,17 'x402-payment' 'x402-protocol':36","prices":[{"id":"2e83a74f-6f9c-4377-bcc3-97337e783126","listingId":"e8d27bae-0498-474c-9e62-32c493656cc9","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:40.291Z"}],"sources":[{"listingId":"e8d27bae-0498-474c-9e62-32c493656cc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:40.291Z","lastSeenAt":"2026-04-22T21:30:30.323Z"}],"details":{"listingId":"e8d27bae-0498-474c-9e62-32c493656cc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/carts/35"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-request basis","Running analytics queries or data exports with instant crypto-settled micropayments","Using utility services like geocoding or data validation without rate limits"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume bulk pricing or subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.127Z"},"updatedAt":"2026-04-22T21:30:30.323Z"}}