{"id":"99388088-5c14-4954-ab01-4fb35a3ece20","shortId":"rwq34p","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 offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/products/99` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is settled on-chain via the x402 \"exact\" scheme with a 300-second timeout.\n\nThe provider's landing page advertises four 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). All endpoints are listed at the same $0.02/request price point. The site claims no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind `/api/v1/products/99` (\"Premium API Access\") is unclear and does not map obviously to any of the listed API categories. Without documentation or example payloads, it is difficult to determine what data this endpoint returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["data","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-gated API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty (wallet-connect only).","No OpenAPI or JSON schema describing request inputs or response outputs for any endpoint.","The specific endpoint /api/v1/products/99 ('Premium API Access') does not correspond to any of the named endpoints on the landing page; its actual functionality is unknown.","Cannot verify that any of the advertised AI, analytics, finance, or utility endpoints actually return meaningful data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/99","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/products/99","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of /api/v1/products/99 specifically is unclear. This is effectively a stub 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'/api/v1/products/99':57,219 '/docs':183 '/pricing':185 '/readme':187 '/request':16,32,163 '0.02':15,31,93,162 '000':84 '0x8335':74 '20':83 '2913':75 '300':109 '402':67 '6':89 'Base network API' 'USDC API' 'access':63,177,222 'advertis':117 'ai':9,25,129 'ai-inference' 'amount':80 'analysi':133 'analyt':8,24,123 'api':4,20,42,62,170,221,235 'base':7,23,51,77,85 'behind':218 'beyond':257 'call':41 'categori':119,236 'chain':101 'challeng':68 'claim':168 'classif':136 'classification' 'collect':36 'connect':193 'content':199 'contract':73 'convers':153 'crypto-gated API' 'crypto-quotes' 'data':122,126,248 'data-analytics' 'decim':90 'detail':210 'determin':246 'difficult':244 'document':178,211,238 'embed':137 'embeddings' 'endpoint':13,29,43,55,121,156,214,250 'equal':92 'estim':147 'exact':105,216 'exampl':207,240 'exchang':142 'expect':256 'export':127 'extrem':180 'feed':141 'financ':10,26,138 'finance-data' 'four':118 'function':217 'gas':146 'gate':3,19,44 'generat':154 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'x402':2,18,47,104 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"7a0ff8d8-ff2e-4bc1-9ef4-395381d4a114","listingId":"99388088-5c14-4954-ab01-4fb35a3ece20","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/products/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:59.552Z"}],"sources":[{"listingId":"99388088-5c14-4954-ab01-4fb35a3ece20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:59.552Z","lastSeenAt":"2026-04-23T17:31:10.602Z"}],"details":{"listingId":"99388088-5c14-4954-ab01-4fb35a3ece20","quickStartSnippet":"# 1. Send a POST to discover the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/99\n# Returns 402 with x402 payment challenge in JSON body.\n# 2. Construct an X-PAYMENT header using the x402 SDK,\n#    paying 20000 base-units ($0.02) USDC on Base to\n#    0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3\n# 3. Replay the POST with the header:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/99 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/products/99"},{"claim":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The site claims no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for analytics metrics or data exports without an API key","Running AI inference tasks (sentiment, summarization, classification) on a pay-as-you-go basis","Fetching real-time crypto token quotes or gas estimates","Geocoding addresses or validating data via utility endpoints"],"bestFor":["Agents or developers who want keyless, pay-per-call API access settled on Base","Low-volume or sporadic usage where $0.02/request is cheaper than a subscription","Crypto-native workflows that can sign x402 payment headers on the fly"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.189Z"},"updatedAt":"2026-04-23T17:31:10.602Z"}}