{"id":"dda6743b-0ff8-447c-92ae-7031c3048877","shortId":"6LDRBJ","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-protocol APIs spanning four categories: 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 pay-per-request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/generate/resource/75` is listed as \"Premium API Access\" and returns a standard x402 challenge on Base network. Payment is in USDC (contract 0x8335…2913) with a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 per request. Settlement is via the x402 \"exact\" scheme, meaning a single upfront payment per call. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page 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 example payloads available. The actual functionality behind \"Premium API Access\" at resource/75 is not described anywhere in the crawled material, making it unclear what data or service this specific endpoint returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","json-response","no-api-key"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/75 ('Premium API Access') is not described anywhere","No OpenAPI spec or request/response schema is provided","No example requests or responses are available to verify what the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/75","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/generate/resource/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of this specific resource/75 endpoint is completely undescribed. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/generate/resource/75':100 '/docs':170 '/pricing':172 '/readme':174 '/request':16,32 '0.02':15,31,136 '000':128 '0x8335':121 '20':127 '2913':122 '6':133 'Base network API' 'USDC API' 'accept':155 'access':106,208 'actual':203 'ai':9,25,52 'analysi':56 'analyt':8,24,46 'anywher':214 'api':4,20,41,87,105,207 'application/json':160 'avail':201 'base':7,23,114,129 'base-network' 'behind':205 'beyond':162 'call':152 'categori':44 'challeng':112 'classif':59 'collect':36 'commit':94 'connect':180 'contract':120 'convers':76 'crawl':217 'data':45,49,223 'decim':134 'describ':213 'detail':187 'document':161,196 'embed':60 'endpoint':13,29,79,98,154,228 'equal':135 'estim':70 'exact':144 'exampl':199 'exchang':65 'export':50 'extrem':167 'feed':64 'financ':10,26,61 'four':43 'function':204 'gas':69 'generat':77 'geocod':74 'http':156 'http-post' 'infrastructur':72 'insight':51 'json-response' 'key':88 'land':164 'learn':54 'limit':91 'list':102 'lowpaymentfee' 'lowpaymentfee.com':33 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'x402-protocol':38","prices":[{"id":"1de37ee2-f48c-4fc9-81b9-cd43c418efc3","listingId":"dda6743b-0ff8-447c-92ae-7031c3048877","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/generate/resource/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:40.272Z"}],"sources":[{"listingId":"dda6743b-0ff8-447c-92ae-7031c3048877","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:40.272Z","lastSeenAt":"2026-04-23T12:05:08.103Z"}],"details":{"listingId":"dda6743b-0ff8-447c-92ae-7031c3048877","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/75 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/75"},{"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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/75"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing analytics, AI inference, finance data, or utility services via micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients on Base network","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Users without USDC on Base network or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.275Z"},"updatedAt":"2026-04-23T12:05:08.103Z"}}