{"id":"d53afe27-af94-43db-a08f-2459eb08ef8f","shortId":"RGVuN9","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/generate/resource/200` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout, payable to address 0x1A2B…85F3.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /pricing, /api, 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 usage examples available from the crawl. The exact functionality of the `/api/v1/generate/resource/200` endpoint is unclear from the available material; it may be a generic resource-generation or test endpoint. Agents should treat this listing with caution until richer documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no useful content.","The exact functionality of /api/v1/generate/resource/200 is unclear; 'Premium API Access' is a generic label.","No examples of request or response payloads are available from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/200","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/200","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 landing page, and the exact purpose of this specific endpoint is ambiguous. Docs pages all return only 'Connect wallet' with no 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'/api/v1/generate/resource/200':107,205 '/docs':166 '/pricing':167 '/readme':170 '/request':19,38 '0.02':18,37,70,136 '000':125 '0x1a2b':155 '0x8335':130 '20':124 '2913':131 '300':149 '6':140 '85f3':156 'Base network API' 'USDC micropayment API' 'access':113 'address':154 'advertis':120 'agent':224 'ai':12,31 'ai-inference' 'ai/ml':57 'analyt':56 'api':5,24,45,83,112 'application/json':116 'attach':95 'avail':196,211 'base':8,27,78,126,133 'beyond':158 'broad':50 'call':4,23 'caller':93 'caution':230 'challeng':119 'collect':51 'connect':176 'content':182 'cover':10,29 'crawl':199 'crypto-paid API' 'data':11,30,55,60 'data-analytics' 'decim':141 'document':157,191,233 'enabl':44 'endpoint':16,35,53,66,105,206,223 'equal':135 'everi':65 'exact':146,201 'exampl':195 'extrem':163 'financ':13,32 'finance-data' 'finance/web3':59 'function':202 'general':62 'generat':220 'generic':217 'given':137 'header':99 'infer':58 'json-api' 'key':84 'land':160 'limit':87 'list':109,228 'lowpaymentfee' 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'x402-payment'","prices":[{"id":"628e19e7-0e7d-40a5-95cc-95b729bbd0d6","listingId":"d53afe27-af94-43db-a08f-2459eb08ef8f","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:44.601Z"}],"sources":[{"listingId":"d53afe27-af94-43db-a08f-2459eb08ef8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:44.601Z","lastSeenAt":"2026-04-24T23:02:33.203Z"}],"details":{"listingId":"d53afe27-af94-43db-a08f-2459eb08ef8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/200 \\\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":"Endpoint returns 402 with x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/200"},{"claim":"All endpoints 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/200"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API calls without pre-registration or API keys","Micropayment-gated data retrieval for analytics or finance workflows","AI inference (sentiment, summarization, classification, embeddings) paid per call","Utility operations like geocoding, validation, or data conversion"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.06Z"},"updatedAt":"2026-04-24T23:02:33.203Z"}}