{"id":"bdbbf5ea-f5cc-4fd7-8146-2ef3601a2491","shortId":"Nkmcgt","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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/379` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The 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 thin: 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 crawl. The actual functionality behind this specific `/transactions/379` endpoint is unclear — the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API access"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","The endpoint path '/api/v1/transactions/379' and title 'Premium API Access' are generic and do not describe what the endpoint actually returns","Cannot verify what data or service is provided after payment is made"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/379","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/379","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. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/transactions/379 is entirely unclear. The docs, pricing, and README pages are all empty 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'/api/v1/transactions/379':96 '/docs':186 '/pricing':188 '/readme':190 '/request':13,28 '/transactions/379':227 '0.02':12,27,64,117,120,173 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '20':111 '402':106 'Base network API' 'USDC micropayment API' 'accept':137 'access':102,235 'account':76 'actual':222 'address':128 'advertis':146 'ai/ml':49 'analysi':150 'analyt':48 'api':5,20,37,74,101,234 'application/json':142 'attach':84 'avail':217 'base':8,23,71,113,122 'behind':224 'beyond':178 'broad':42 'broader':144 'call':4,19 'caller':82 'catalog':43 'challeng':107 'classif':153 'connect':196 'convers':165 'crawl':220 'crypto-paid API' 'data':47,52,167,243 'describ':241 'detail':203 'document':177,212 'embed':154 'enabl':36 'endpoint':45,57,94,136,147,228 'estim':162 'exact':132 'exampl':216 'exchang':157 'extrem':183 'feed':156 'finance/web3':51 'function':223 'gas':161 'generat':168 'generic':237 'geocod':163 'header':88 'howev':176 'i.e':119 'infer':50 'json-response' 'key':75 'land':180 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'made':126 'name':232 'network':9,24,72 'no-api-key' 'offer':40 'openapi':207 'page':181,191 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,124,133 'per':3,18,61 'platform':6,21,38,145 'point':175 'post':138 'post-method' 'premium':100,233 'price':155,174 'prompt':198 'quot':160 'rate':78,158 'render':193 'request':62,91,108,139 'request/response':210 'requir':81 'return':104,141,247 'schema':211 'scheme':134 'sentiment':149 'serverless API access' 'servic':55,245 'settl':66 'simpli':83 'span':46 'spec':208 'specif':93,226 'summar':152 'technic':202 'text':151 'thin':184 'token':159 'unclear':230 'unit':114 'usag':215 'usdc':15,30,68,116,118 'usdc-base' 'use':130 'util':54 'valid':164 'via':10,25 'wallet':197 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"756bdf4d-1967-4d65-abea-91ceda42f2f2","listingId":"bdbbf5ea-f5cc-4fd7-8146-2ef3601a2491","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/379","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:37.456Z"}],"sources":[{"listingId":"bdbbf5ea-f5cc-4fd7-8146-2ef3601a2491","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/379","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:37.456Z","lastSeenAt":"2026-04-22T18:32:35.991Z"}],"details":{"listingId":"bdbbf5ea-f5cc-4fd7-8146-2ef3601a2491","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/379 \\\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":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/379"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing on-demand API services without creating an account or managing API keys","Making micropayment-gated API calls settled in USDC on Base","Programmatic pay-per-use access to data, AI, or utility endpoints"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request API calls without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.418Z"},"updatedAt":"2026-04-22T18:32:35.991Z"}}