{"id":"821188e1-db1d-42de-82fe-b3fc85a81f87","shortId":"5g3yMD","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 marketplace offering a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/products/41` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises categories including 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 follow the x402 payment protocol: callers receive a 402 challenge with payment details, settle in USDC on Base, and then receive the response.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any individual endpoint. The `/api/v1/products/41` endpoint's purpose beyond \"Premium API Access\" is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific function of /api/v1/products/41 ('Premium API Access') is unclear; it may be a generic product listing or a meta-endpoint","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/41","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/products/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 in USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/products/41 beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,58 '402':143 'access':89,204 'across':45 'advertis':97 'ai':107 'ai-inference' 'ai/ml':48 'analysi':111 'analyt':47,101 'api':5,20,37,70,88,164,203 'application/json':92 'avail':208 'base':8,23,66,152 'base network api' 'beyond':201 'broad':41 'call':4,19 'caller':140 'categori':98 'challeng':144 'classif':114 'commit':78 'connect':173 'content':179 'convers':131 'cost':57 'data':46,51,100,104 'data-analytics' 'detail':147,190 'doc':163 'document':158,191 'embed':115 'enabl':36 'endpoint':44,56,81,134,195,198 'estim':125 'everi':55 'exampl':187 'exchang':120 'export':105 'extrem':160 'feed':119 'financ':116 'finance-data' 'finance/web3':50 'follow':135 'gas':124 'generat':132 'geocod':129 'includ':99 'individu':194 'infer':49 'infrastructur':127 'insight':106 'json-response' 'key':71 'learn':109 'limit':74 'list':85 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':108 'marketplac':38 'materi':209 'metric':102 'micropayment api' 'network':9,24,67 'no-api-key' 'offer':39 'openapi':183 'page':168 'paid':61 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':138,146 'per':3,18,59 'platform':6,21,96 'post':94 'premium':87,202 'price':118,165 'prompt':175 'protocol':139 'purpos':200 'quot':123 'rate':73,121 'readm':167 'receiv':141,155 'render':170 'report':103 'request':60 'request/response':186 'respons':157 'return':91 'schema':184 'sentiment':110 'servic':54 'set':42 'settl':148 'spars':161 'specif':80 'summar':113 'text':112 'token':122 'unclear':206 'upfront':77 'usdc':15,30,63,150 'usdc api' 'usdc-base-network' 'util':53,128 'utility-services' 'valid':130 'via':10,25,93 'wallet':174 'web3':117 'web3-data' 'x402':11,26,35,137 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a4fe6bc1-b51f-4a54-baa1-689bef2f993f","listingId":"821188e1-db1d-42de-82fe-b3fc85a81f87","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/products/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:12.205Z"}],"sources":[{"listingId":"821188e1-db1d-42de-82fe-b3fc85a81f87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:12.205Z","lastSeenAt":"2026-04-23T10:30:29.585Z"}],"details":{"listingId":"821188e1-db1d-42de-82fe-b3fc85a81f87","quickStartSnippet":"# 1. POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/products/41\n\n# 2. Pay the USDC challenge on Base, then resend with X-PAYMENT header\ncurl -X POST https://lowpaymentfee.com/api/v1/products/41 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/41","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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 for /api/v1/products/41 requires maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/41"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics or reports on a per-call basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments","Fetching real-time crypto token quotes, gas estimates, or exchange rates","Geocoding, data validation, or format conversion via utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated API calls in USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.648Z"},"updatedAt":"2026-04-23T10:30:29.585Z"}}