{"id":"fca9fc32-efac-4f16-acda-0aeecc02375c","shortId":"T5DZTD","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 a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/cards/8` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The site advertises four broad categories of endpoints: 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).\n\nAll endpoints share the same $0.02-per-request pricing model with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely via the x402 protocol's `X-PAYMENT` header using USDC on Base (contract 0x8335…2913). The `/api/v1/cards/8` endpoint accepts HTTP POST and returns `application/json`. Documentation pages beyond the landing page are gated behind a wallet-connect flow, so detailed request/response schemas, parameter descriptions, and example payloads are not publicly available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all gated behind wallet-connect and return no useful content.","No OpenAPI or schema available; request parameters and response format for /api/v1/cards/8 are unknown.","The specific purpose of '/api/v1/cards/8' is unclear — it does not map to any of the named endpoints on the landing page.","Cannot verify that the advertised AI, finance, and utility endpoints actually function; only /api/v1/cards/8 was probed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/8","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/cards/8","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 OpenAPI schema, no request/response examples, and all documentation pages are gated behind wallet-connect with no public content. The purpose of the specific '/api/v1/cards/8' endpoint is unclear beyond the generic 'Premium API Access' label. Pricing is clear but everything else must be inferred from the landing 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'/request':16,32 '0.02':15,31,78,128 '000':73 '0x8335':163 '20':72 '2913':164 'Base network API' 'USDC API' 'accept':168 'access':63 'advertis':84 'ai':9,25,97 'ai-inference' 'analysi':101 'analyt':8,24,91 'api':4,20,45,62,136 'application/json':173 'avail':200 'base':7,23,52,74,161 'behind':182 'beyond':176 'broad':86 'call':44,81 'categori':87 'challeng':68 'classif':104 'classification' 'collect':36 'commit':144 'connect':186 'contract':162 'convers':121 'conversion' 'data':90,94 'data-analytics' 'descript':193 'detail':189 'document':174 'embed':105 'embeddings' 'endpoint':13,29,46,56,89,124,167 'entir':148 'estim':115 'exampl':195 'exchang':110 'export':95 'feed':109 'financ':10,26,106 'finance-data' 'flow':187 'four':85 'gas':114 'gate':3,19,181 'generat':122 'geocod':119 'geocoding' 'handl':147 'header':157 'http':169 'infrastructur':117 'insight':96 'key':137 'land':178 'learn':99 'limit':140 'list':59 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':98 'metric':92 'micropayment API' 'minimum':143 'model':133 'network':53 'page':175,179 'paramet':192 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payload':196 'payment':145,156 'per':43,80,130 'per-request':129 'post':170 'premium':61 'price':108,132 'protocol':40,152 'public':199 'quot':113 'rate':111,139 'report':93 'request':69,131 'request/response':190 'return':65,172 'schema':191 'sentiment':100 'sentiment-analysis' 'settl':47 'share':125 'site':83 'specif':55 'suit':5,21 'summar':103 'text':102 'text-summarization' 'token':112 'unit':75 'usd':79 'usdc':49,77,159 'usdc-base' 'use':158 'util':12,28,118 'valid':120 'validation' 'via':149 'wallet':185 'wallet-connect':184 'web3':107 'x':155 'x-payment':154 'x402':2,18,39,67,151 'x402 API marketplace' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"285891b7-f7c2-406e-b30c-6ade8a4f53d6","listingId":"fca9fc32-efac-4f16-acda-0aeecc02375c","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/cards/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:02.504Z"}],"sources":[{"listingId":"fca9fc32-efac-4f16-acda-0aeecc02375c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:02.504Z","lastSeenAt":"2026-04-22T18:31:25.480Z"}],"details":{"listingId":"fca9fc32-efac-4f16-acda-0aeecc02375c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/8 \\\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 an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/8"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/8"},{"claim":"All 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 site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token price quotes on demand","Geocoding addresses or validating data in automated agent workflows","Exporting analytics data or generating reports with per-request billing"],"bestFor":["Agents or scripts that need occasional API calls without subscription overhead","Developers who prefer crypto-native pay-per-use billing on Base","Prototyping workflows that span multiple API categories (AI, finance, geo)"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation and schemas before integrating","Teams that require fiat-only billing or cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.513Z"},"updatedAt":"2026-04-22T18:31:25.480Z"}}