{"id":"1c16a773-b8a2-4773-971c-942dd3f8d5d1","shortId":"nP7Wru","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/carts/3` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises categories including 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 listed endpoints share the same $0.02 price point. The x402 challenge uses the \"exact\" payment scheme, pays to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and allows a maximum timeout of 300 seconds.\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 spec, no request/response schema documentation, and no examples of what the `/api/v1/carts/3` endpoint actually returns. The purpose of the \"carts/3\" resource specifically is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found for any endpoint","The specific purpose and expected input/output of /api/v1/carts/3 ('Premium API Access') is undocumented","Cannot verify that the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation is effectively absent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of '/api/v1/carts/3' is unexplained. The broad catalog of endpoints is listed on the homepage but none have documented 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'/api/v1/carts/3':84,222 '/call':13,28 '/docs':190 '/pricing':192 '/readme':194 '0.02':12,27,111,162 '000':100 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':176 '0x8335':105 '20':99 '2913':106 '300':183 '402 payment api' '6':116 'access':90 'actual':224 'address':175 'advertis':120 'ai':130 'ai-inference' 'ai/ml':49 'allow':178 'analysi':134 'analyt':48,124 'api':5,20,37,71,89 'avail':237 'base':8,23,67,101,108 'base network api' 'broad':42 'call':113 'carts/3':230 'catalog':43 'categori':121 'challeng':95,167 'classif':137 'classification' 'commit':78 'connect':200 'content':206 'convers':154 'data':47,52,123,127 'data-analytics' 'decim':117 'document':185,215 'embed':138 'embeddings' 'enabl':36 'endpoint':45,57,82,158,223 'equal':110 'estim':148 'exact':170 'exampl':218 'exchang':143 'export':128 'extrem':187 'feed':142 'financ':139 'finance-data' 'finance/web3':51 'gas':147 'generat':155 'geocod':152 'geocoding' 'includ':122 'infer':50 'infrastructur':150 'insight':129 'key':72 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'x402-enabled':34 'x402-payment'","prices":[{"id":"ac57b31d-3821-41e5-8d35-467da868ed46","listingId":"1c16a773-b8a2-4773-971c-942dd3f8d5d1","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:38.500Z"}],"sources":[{"listingId":"1c16a773-b8a2-4773-971c-942dd3f8d5d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:38.500Z","lastSeenAt":"2026-04-22T21:30:30.251Z"}],"details":{"listingId":"1c16a773-b8a2-4773-971c-942dd3f8d5d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/3 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/3 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/3"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request USDC micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers wanting zero-friction API access without signup or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, rate-limit guarantees, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.142Z"},"updatedAt":"2026-04-22T21:30:30.251Z"}}