{"id":"b963184d-1d24-4680-bac4-094e04e05a3b","shortId":"SaMRnd","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 `/api/v1/products/12` is listed as \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists 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 are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 description of what the `/api/v1/products/12` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for any endpoint.","The specific purpose and response format of /api/v1/products/12 is undocumented; 'Premium API Access' is a generic label.","Cannot verify what data or service is actually delivered after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/12","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/12","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/12' specifically is unknown beyond the generic label 'Premium API 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'/api/v1/products/12':56,196 '/docs':164 '/pricing':166 '/readme':168 '/request':16,32 '0.02':15,31,94,144 '000':84 '0x8335':72 '20':83 '2913':73 '402':207 '6':89 'Base network API' 'USDC API' 'accept':64 'access':62,221 'actual':198 'advertis':79 'ai':9,25,114 'analysi':118 'analyt':8,24,108 'api':4,20,42,61,149,220 'base':7,23,51,75,85 'base-network' 'call':41 'categori':104 'challeng':78,208 'classif':121 'collect':36 'commit':157 'connect':174 'content':180 'contract':71 'convers':138 'data':107,111,216 'decim':90 'descript':192 'detail':191 'document':159,211 'embed':122 'endpoint':13,29,43,55,106,197,201,227 'equal':93 'estim':132 'exampl':188 'exchang':127 'export':112 'extrem':161 'feed':126 'financ':10,26,123 'four':103 'function':218 'gas':131 'gate':3,19,44 'generat':139 'geocod':136 'infrastructur':134 'insight':113 'json-response' 'key':150 'land':100 'learn':116 'limit':153 'list':58,102,226 'live':203 'low payment fee' 'lowpaymentfee.com':33 'machin':115 'maxamountrequir':81 'metric':109 'micropayment API' 'minimum':156 'network':52 'no-api-key' 'offer':34 'openapi':184 'page':101,169 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payment':68 'per':40,95,145 'post':65 'post-method' 'premium':60,219 'premium API access' 'price':125,142 'prompt':176 'protocol':48 'provid':98,222 'quot':130 'rate':128,152 'render':171 'report':110 'request':66,96,146 'request/response':187 'requir':158 'return':199,204 'schema':185 'sentiment':117 'settl':67 'spars':162 'specif':54 'suit':5,21 'summar':120 'text':119 'token':129 'unclear':214 'unit':86 'usdc':70,92 'usdc-settlement' 'util':12,28,135 'valid':137,206 'versus':223 'wallet':175 'web3':124 'without':210 'x402':2,18,47,77 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"1420a37f-9ec9-4bd4-a4da-3f7b0dabe89d","listingId":"b963184d-1d24-4680-bac4-094e04e05a3b","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:23.722Z"}],"sources":[{"listingId":"b963184d-1d24-4680-bac4-094e04e05a3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:23.722Z","lastSeenAt":"2026-04-23T20:01:21.716Z"}],"details":{"listingId":"b963184d-1d24-4680-bac4-094e04e05a3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/12 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/products/12"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.","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":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand data or utility calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-request microservices"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads where endpoint behavior is not well-documented","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:47:43.152Z"},"updatedAt":"2026-04-23T20:01:21.716Z"}}