{"id":"e569c3b6-eda4-4d0b-8e54-839eefdfcc86","shortId":"QG7LxS","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/23` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four categories of APIs: 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 per-request pricing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind `/api/resource/23` (\"Premium API Access\") is not described beyond its title, so its actual behavior is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-apis"],"categories":["api-platform","data","llm"],"synonyms":["low payment fee","micropayment API","x402 API","USDC API","pay-per-call","Base network API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — actual request/response format for /api/resource/23 is unknown","All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no technical content","The specific functionality of /api/resource/23 ('Premium API Access') is not described anywhere in the crawled material","No examples, error codes, or rate limit information documented"],"endpointUrl":"https://lowpaymentfee.com/api/resource/23","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/resource/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific function of /api/resource/23 is undescribed. Effectively a stub 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'/request':19,38 '0.02':18,37,79,157 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'access':74,210 'actual':219 'advertis':113 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,73,92,117,168,209 'attach':103 'avail':198 'base':8,27,63,84 'base-network' 'behavior':220 'behind':206 'beyond':214 'broad':50 'call':4,23,81 'caller':101 'catalog':51 'categori':115 'charg':76 'classif':132 'commit':98 'connect':177 'convers':149 'crawl':201 'crypto-paid API' 'data':11,30,118,122 'data-analytics' 'decim':90 'describ':213 'detail':184 'doc':167 'document':162,193 'embed':133 'enabl':44 'endpoint':16,35,57,67,153 'estim':143 'exampl':197 'exchang':138 'export':123 'extrem':164 'feed':137 'financ':13,32,134 'finance-data' 'four':114 'function':205 'gas':142 'generat':150 'geocod':147 'header':107 'infrastructur':145 'insight':124 'key':93 'label':71 'learn':127 'limit':95 'list':152 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'materi':202 'metric':120 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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/resource/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:47.747Z"}],"sources":[{"listingId":"e569c3b6-eda4-4d0b-8e54-839eefdfcc86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:47.747Z","lastSeenAt":"2026-04-23T21:31:45.925Z"}],"details":{"listingId":"e569c3b6-eda4-4d0b-8e54-839eefdfcc86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/23 \\\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":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/resource/23"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Lightweight utility calls (geocoding, validation, conversion) settled instantly on Base"],"bestFor":["AI agents or bots that need keyless, pay-as-you-go API access","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, schemas, or example payloads before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.743Z"},"updatedAt":"2026-04-23T21:31:45.925Z"}}