{"id":"fa69f769-3dfd-4688-ad84-feecd32ac77a","shortId":"VnLX9F","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/29` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required.\n\nThe broader platform advertises four categories of APIs: 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 are listed at the same $0.02 per request price point. However, the specific product behind `/api/v1/products/29` is labeled only as \"Premium API Access\" without further detail on what data or functionality it returns.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no example request/response payloads, and no detailed description of what the `/api/v1/products/29` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what you're paying for.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","premium api access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or output schema provided; the actual response payload is unknown.","The endpoint name 'Premium API Access' is generic and does not describe the functionality.","Cannot verify what data or service is delivered after payment without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no example request/response, and the product description is completely generic (\"Premium API Access\"). It is impossible to determine what this endpoint actually returns without 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'/api/v1/products/29':67,169,225 '/docs':192 '/pricing':194 '/readme':196 '/request':17,34 '0.02':16,33,89,159 '000':83 '20':82 '402':234 'access':45,73,176 'actual':227 'advertis':115 'ai':10,27,127 'analysi':131 'analyt':121 'api':4,21,41,72,102,119,175 'base':7,24,61,84 'base usdc api' 'base-network' 'behind':51,168 'broader':113 'call':91 'captur':236 'categori':117 'challeng':78,235 'classif':134 'commit':110 'confirm':232 'connect':202 'content':208 'convers':150 'data':9,26,120,124,182 'descript':221 'detail':179,220 'difficult':244 'document':187,241 'embed':135 'endpoint':14,31,50,65,153,226,230 'estim':145 'exact':98 'exampl':215 'exchang':140 'export':125 'extrem':189 'feed':139 'financ':11,28,136 'four':116 'function':184 'gas':144 'gate':3,20,44 'generat':151 'geocod':148 'howev':164 'i.e':88 'infrastructure/utilities':147 'insight':126 'json-response' 'key':103 'know':246 'label':171 'lack':239 'learn':129 'limit':106 'list':69,155 'live':233 'low payment fee' 'lowpaymentfee.com':35 'machin':128 'made':94 'make':242 'marketplac':42 'metric':122 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'offer':8,25 'openapi':212 'page':197 'pay':250 'pay-per-request api' 'payload':217 'payment':92 'per':53,90,160 'per-request':52 'per-request-billing' 'platform':5,22,114 'point':163 'premium':71,174 'premium api access' 'price':138,162 'product':167 'prompt':204 'protocol':40 'quot':143 'rate':105,141 're':249 'render':199 'report':123 'request':54,79,161 'request/response':216 'requir':111 'return':75,186,228 'schema':213 'scheme':99 'sentiment':130 'settl':56 'spars':190 'specif':64,166 'substant':207 'summar':133 'text':132 'token':142 'unit':85 'upfront':109 'usdc':58,87 'usdc-micropayment' 'util':13,30 'valid':149 'varieti':48 'via':95 'wallet':203 'web3':137 'without':177 'x402':2,19,39,77,97 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8485de15-1726-4365-b6ac-28eb2bf4c34d","listingId":"fa69f769-3dfd-4688-ad84-feecd32ac77a","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:44.911Z"}],"sources":[{"listingId":"fa69f769-3dfd-4688-ad84-feecd32ac77a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:44.911Z","lastSeenAt":"2026-04-22T13:30:24.655Z"}],"details":{"listingId":"fa69f769-3dfd-4688-ad84-feecd32ac77a","quickStartSnippet":"# The endpoint returns HTTP 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/29 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with accepts[].maxAmountRequired = 20000 (USDC, 6 decimals = $0.02)\n# Attach X-PAYMENT header with a valid x402 payment proof to get the response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/29"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/29"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without API key management","Agent-driven micropayment workflows using x402 on Base","Pay-per-call access to data, AI, finance, or utility services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-request API access","x402-compatible wallets and agent frameworks on Base","Exploring micropayment-gated API patterns"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:21:54.94Z"},"updatedAt":"2026-04-22T13:30:24.655Z"}}