{"id":"9589df34-18d4-4907-8835-06865d5994f4","shortId":"KZc7kU","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/181` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation 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 usage examples available from the crawled material. The actual functionality behind this specific `/api/v1/transactions/181` endpoint is unclear from the available information.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["No OpenAPI spec or machine-readable schema available","Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/transactions/181 ('Premium API Access') is not described anywhere in the crawled material","No request body schema or response schema documented — callers cannot know what to send or what to expect back","The platform lists many endpoint categories (AI, finance, analytics, etc.) but provides no evidence of actual underlying functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/181","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/181","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality of the /api/v1/transactions/181 endpoint is undocumented and unclear. This is effectively a stub 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'/api/v1/transactions/181':102,236 '/docs':194 '/pricing':196 '/readme':198 '/request':13,30 '0.02':12,29,62,123,181 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '20':117 '402':112 '6':128 'Base network API' 'USDC micropayment API' 'accept':145 'access':108 'across':50 'actual':231 'address':136 'advertis':154 'ai/ml':53 'analysi':158 'analyt':52 'api':5,15,22,32,41,79,107 'application/json':150 'attach':91 'avail':225,242 'base':8,25,70,119,131 'behind':233 'beyond':186 'broad':46 'broader':152 'call':4,21 'caller':89 'challeng':113 'classif':161 'connect':204 'convers':173 'cost':61 'crawl':228 'crypto-paid API' 'data':51,175 'decim':129 'detail':211 'document':185,220 'embed':162 'enabl':40 'endpoint':49,60,100,144,155,237 'estim':170 'everi':59 'exact':140 'exampl':224 'exchang':165 'extrem':191 'feed':164 'finance/web3':55 'function':232 'gas':169 'generat':176 'geocod':171 'header':94 'howev':184 'infer':54 'inform':243 'infrastructur':57 'json-response' 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'x402-payment'","prices":[{"id":"00a41415-6aa7-4268-828c-43d50b78e0a3","listingId":"9589df34-18d4-4907-8835-06865d5994f4","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:51.584Z"}],"sources":[{"listingId":"9589df34-18d4-4907-8835-06865d5994f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:51.584Z","lastSeenAt":"2026-04-22T07:31:48.635Z"}],"details":{"listingId":"9589df34-18d4-4907-8835-06865d5994f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/181 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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 requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/181"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/181"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing to register or manage API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents that can settle payments via x402 on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.829Z"},"updatedAt":"2026-04-22T07:31:48.635Z"}}