{"id":"2853786c-ee03-4267-8226-86388b921c28","shortId":"GFr9wm","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 platform that provides a collection of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/generate/resource/65` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335...2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The exact functionality behind the `/api/v1/generate/resource/65` path is unclear — the listing title says \"Premium API Access\" but the endpoint path suggests a generation or resource-creation function. Without documentation, the actual input parameters and response format cannot be confirmed.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis","no-api-key"],"categories":["llm","data","finance","utility"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request parameters and response format are unknown","The specific purpose of /api/v1/generate/resource/65 ('Premium API Access') is ambiguous; it could be a generation endpoint or a generic resource","The platform lists many endpoint categories but it is unclear if all are fully functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality of this specific resource/65 endpoint is 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'/api/v1/generate/resource/65':107,214 '/docs':174 '/pricing':175 '/readme':178 '/request':17,34 '0.02':16,33,93,134 '000':123 '0x8335':128 '20':122 '2913':129 '402':117 'Base network API' 'USDC API' 'access':113,224 'across':52 'actual':240 'ai':10,27,62 'ai-inference' 'analysi':66 'analyt':56 'api':4,21,40,112,145,223 'attach':158 'avail':204 'base':7,24,101,124,131 'behind':212 'caller':156 'cannot':246 'categori':54 'challeng':118 'classif':69 'classification' 'collect':45 'confirm':248 'connect':184 'content':190 'convers':86 'crawl':207 'creation':235 'crypto-paid API' 'data':9,26,55,59 'data-analytics' 'document':169,199,238 'embed':70 'embeddings' 'endpoint':14,31,51,89,105,227 'equal':133 'estim':80 'exact':141,210 'exampl':203 'exchang':75 'export':60 'extrem':171 'feed':74 'financ':11,28,71 'finance-data' 'format':245 'four':53 'function':211,236 'gas':79 'gate':3,20 'generat':87,231 'geocod':84 'geocoding' 'header':163 'infrastructur':82 'input':241 'insight':61 'key':146 'learn':64 'limit':149 'list':109,219 'low fee API' 'lowpaymentfee.com':35 'machin':63 'made':137 'metric':57 'micropayment API' 'network':102 'no-api-key' 'offer':8,25 'openapi':194 'page':179,208 'paid':96 'paramet':242 'path':215,228 'pay':48 'pay-per-call API' 'pay-per-request':47 'payment':135,162,167 'per':49,94 'platform':5,22,41 'premium':111,222 'price':73,91 'prompt':186 'proof':168 'protocol':39 'provid':43 'quot':78 'rate':76,148 'render':181 'report':58 'request':50,95,119 'request/response':197 'requir':155 'resourc':234 'resource-cr':233 'respons':244 'return':115 'say':221 'schema':198 'scheme':142 'sentiment':65 'sentiment-analysis' 'serverless API' 'sign':153 'sign-up':152 'simpli':157 'spars':172 'spec':195 'specif':104 'suggest':229 'summar':68 'text':67 'text-summarization' 'titl':220 'token':77 'unclear':217 'unit':125 'usag':202 'usdc':98,127 'usdc-base' 'util':13,30,83 'utility-apis' 'valid':85,166 'via':138 'wallet':185 'web3':72 'without':237 'x':161 'x-payment':160 'x402':2,19,38,140 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"0ab3f252-7805-4d99-a2a3-39e78d51ffa6","listingId":"2853786c-ee03-4267-8226-86388b921c28","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:30.690Z"}],"sources":[{"listingId":"2853786c-ee03-4267-8226-86388b921c28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:30.690Z","lastSeenAt":"2026-04-24T01:31:41.758Z"}],"details":{"listingId":"2853786c-ee03-4267-8226-86388b921c28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/65 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/65"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data like token quotes, gas estimates, or exchange rates via micropayment","Running utility operations like geocoding, validation, or data conversion with per-request billing","Accessing data analytics and export endpoints without subscription commitments"],"bestFor":["AI agents that need keyless, pay-per-use API access on Base","Developers prototyping with multiple API categories without sign-up friction","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.573Z"},"updatedAt":"2026-04-24T01:31:41.758Z"}}