{"id":"6871bfcc-549f-4516-b0a0-1191bd8c49ce","shortId":"7sde3Y","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request 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 at a flat rate of $0.02 per call, with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transactions/218` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\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 content. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input the POST body expects or what the response payload looks like for this particular transactions endpoint.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","pay-per-use","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI spec or any machine-readable schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The purpose and expected input/output of /api/v1/transactions/218 is completely undocumented","No response examples or error documentation found","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/218","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/transactions/218","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, confirming pricing and payment details. However, documentation is effectively absent — all doc pages show only 'Connect wallet' with no schemas, examples, or descriptions of what this specific endpoint does. The listing title 'Premium API Access' is generic and uninformative. Without request/response schemas this is essentially a 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'/api/v1/transactions/218':92 '/docs':169 '/pricing':171 '/readme':173 '/request':13,28 '0.02':12,27,74,119,161 '000':108 '0x8335':113 '20':107 '2913':114 '300':130 '402':102,209 'Base network API' 'USDC API' 'access':98 'addit':136 'advertis':135 'ai-inference' 'ai/ml':49 'analysi':140 'analyt':48 'api':5,20,37,79,97 'avail':200 'base':8,23,67,109,116 'bodi':222 'broad':42 'call':4,19,76 'catalog':43 'challeng':103,210 'classif':143 'confirm':211 'connect':179 'content':204 'convers':153 'crawl':203 'crypto-data' 'crypto-paid API' 'data':47,52,155 'data-analytics' 'detail':186 'document':164,195,214 'embed':144 'enabl':36 'endpoint':45,57,90,137,206,235 'equal':118 'estim':150 'exact':126 'exampl':199 'exchang':147 'expect':223 'export':156 'extrem':166 'feed':146 'finance-data' 'finance/web3':51 'flat':71 'gas':149 'geocod':151 'infer':50 'input':219 'key':80 'like':230 'limit':83 'list':94 'live':208 'look':229 'lowpaymentfee' 'lowpaymentfee.com':31 'made':122 'micropayment API' 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'x402-payment'","prices":[{"id":"de542b1b-8b17-4eff-b3eb-ad32a5130a48","listingId":"6871bfcc-549f-4516-b0a0-1191bd8c49ce","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/transactions/218","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:20.509Z"}],"sources":[{"listingId":"6871bfcc-549f-4516-b0a0-1191bd8c49ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/218","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:20.509Z","lastSeenAt":"2026-04-22T21:31:37.969Z"}],"details":{"listingId":"6871bfcc-549f-4516-b0a0-1191bd8c49ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/218 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $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 (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/218"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance, crypto, and utility services","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto token quotes, gas estimates, and exchange rates","Geocoding, data validation, and format conversion utilities"],"bestFor":["Developers who want zero-setup, keyless API access paid in USDC","Agents and bots that need pay-per-call endpoints without rate limits","Prototyping and low-volume use cases where subscription APIs are overkill"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation and response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.589Z"},"updatedAt":"2026-04-22T21:31:37.969Z"}}