{"id":"0b63c88b-7fdd-4c43-ba15-738317382186","shortId":"CMs4PB","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/generate/resource/66` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header with a signed payment to the provider's address, and the endpoint returns an `application/json` response.\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/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\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 endpoint. The actual functionality behind `/api/v1/generate/resource/66` (labeled \"Premium API Access\") is unclear and does not map obviously to any of the named endpoints on the homepage. Callers should expect JSON output but specifics are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","llm","data","finance","geo"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided for any endpoint","The purpose of /api/v1/generate/resource/66 ('Premium API Access') is unclear and does not correspond to any named endpoint on the homepage","Cannot verify what data or functionality is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/66","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/generate/resource/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation, no OpenAPI schema, no request/response examples, and the specific purpose of resource/66 is undefined. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/generate/resource/66':67,232 '/docs':196 '/pricing':198 '/readme':200 '/request':17,34,174 '0.02':16,33,78,93,173 '000':84 '20':83 '402 payment API' '6':91 'Base USDC API' 'access':45,73,190,236 'actual':229 'address':117 'advertis':128 'ai':10,27,140 'ai-inference' 'analysi':144 'analyt':134 'api':4,21,41,72,132,181,235 'application/json':123 'base':7,24,61,85 'behind':51,231 'broader':126 'call':80 'caller':102,253 'categori':130 'classif':147 'connect':206 'content':212 'convers':164 'cost':75 'crypto-gated API' 'data':9,26,133,137 'data-analytics' 'decim':92 'detail':223 'document':191,224 'embed':148 'emphas':179 'endpoint':14,31,50,65,120,167,227,249 'estim':158 'exact':100 'exampl':220 'exchang':153 'expect':255 'export':138 'extrem':193 'feed':152 'financ':11,28,149 'finance-data' 'four':129 'function':230 'gas':157 'gate':3,20,44 'generat':165 'geocod':162 'handl':96 'header':108 'homepag':252 'includ':103 'infrastructur':160 'insight':139 'instant':189 'json':256 'json-response' 'key':182 'label':233 'learn':142 'limit':185 'list':69,169 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':141 'map':242 'marketplac':42 'maxamountrequir':81 'metric':135 'micropay':55 'micropayment API' 'minimum':187 'name':248 'network':62 'obvious':243 'offer':8,25 'openapi':216 'output':257 'page':201 'pay-per-request API' 'payment':94,107,112 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,127,178 'point':176 'premium':71,234 'price':151,175 'prompt':208 'protocol':40 'provid':115 'quot':156 'rate':154,184 'render':203 'report':136 'request':54 'request/response':219 'respons':124 'return':121 'schema':217 'scheme':101 'sentiment':143 'settl':56 'sign':111 'spars':194 'specif':64,259 'summar':146 'text':145 'token':155 'unclear':238 'unit':86 'unknown':261 'usdc':58,88 'usdc-base' 'util':13,30,161 'utility-services' 'valid':163 'varieti':48 'via':97 'wallet':207 'web3':150 'x':106 'x-payment':105 'x402':2,19,39,99 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"b563fc9f-8990-4f11-a706-77d67b756b06","listingId":"0b63c88b-7fdd-4c43-ba15-738317382186","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/generate/resource/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:22.147Z"}],"sources":[{"listingId":"0b63c88b-7fdd-4c43-ba15-738317382186","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:22.147Z","lastSeenAt":"2026-04-23T15:00:44.829Z"}],"details":{"listingId":"0b63c88b-7fdd-4c43-ba15-738317382186","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/66 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/66"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/66"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, no minimums, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a pay-per-call basis","Running utility operations like geocoding, validation, and data conversion with no subscription commitment","Programmatic agents paying for API calls autonomously via x402 protocol on Base"],"bestFor":["AI agents that need keyless, pay-per-call API access","Developers prototyping with low-commitment micropayment APIs","Web3-native applications that prefer on-chain payment rails over traditional billing"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume production workloads where per-request crypto payments add latency or cost overhead","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.024Z"},"updatedAt":"2026-04-23T15:00:44.829Z"}}