{"id":"fae2f8ca-ae51-48cc-82c6-3109710e6226","shortId":"8P2XeP","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-enabled API platform that exposes a broad catalog of 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/claims/83` 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 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind the `/api/v1/claims/83` path is unclear; the generic \"Premium API Access\" label does not describe what data or service is returned. Agents should be aware that without documented input/output schemas, integration requires experimentation or additional out-of-band information.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api access"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only a wallet-connect prompt","The specific endpoint /api/v1/claims/83 labeled 'Premium API Access' has no description of what it actually returns","No example request or response payloads are documented anywhere","The broad catalog of endpoints listed on the homepage cannot be individually verified from the crawl data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/83","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/claims/83","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 pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/claims/83 is undescribed. This is effectively a stub 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'/api/v1/claims/83':110,217 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34 '0.02':16,33,94,137 '000':126 '0x8335':131 '20':125 '2913':132 '402':120 '6':141 'accept':165 'access':116,225 'across':50 'actual':213 'addit':195,249 'agent':236 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,115,153,224 'application/json':170 'avail':211 'awar':239 'band':253 'base':7,24,101,127,134 'base network api' 'base-network' 'behind':215 'beyond':172 'broad':46 'call':92 'catalog':47 'categori':52 'challeng':121 'cheap api access' 'classif':67 'classification' 'commit':161 'connect':190 'content':197 'convers':84 'data':9,26,53,57,231 'data-analytics' 'decim':142 'describ':229 'document':171,206,242 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,109,164 'equal':136 'estim':78 'exact':149 'exampl':209 'exchang':73 'experiment':247 'export':58 'expos':44 'extrem':177 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':214 'gas':77 'gate':3,20 'generat':85 'generic':222 'geocod':82 'geocoding' 'given':138 'inform':254 'infrastructur':80 'input/output':243 'insight':59 'integr':245 'key':154 'label':226 'land':174 'learn':62 'limit':157 'list':112 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':145 'metric':55 'micropayment api' 'network':102 'no-api-key' 'offer':8,25 'openapi':201 'out-of-band':250 'page':175,185 'path':218 'pay':90 'pay per call api' 'pay-per-cal':89 'pay-per-request' 'payload':210 'payment':143 'per':91 'platform':5,22,42 'post':166 'premium':114,223 'price':71 'prompt':192 'protocol':106 'quot':76 'rate':74,156 'render':187 'report':56 'request':122,167 'request/response':204 'requir':162,246 'return':118,169,235 'schema':205,244 'scheme':150 'sentiment':63 'sentiment-analysis' 'servic':233 'settl':96 'spars':178 'spec':202 'specif':108 'summar':66 'technic':196 'text':65 'text-summarization' 'token':75 'unclear':220 'unit':128 'upfront':160 'usdc':98,130,139 'usdc api' 'usdc-settlement' 'util':13,30,81 'valid':83 'via':103,146 'wallet':191 'web3':70 'without':241 'x402':2,19,39,105,148 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"79fde934-1883-4dae-9ace-61501869dd13","listingId":"fae2f8ca-ae51-48cc-82c6-3109710e6226","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/claims/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:59.744Z"}],"sources":[{"listingId":"fae2f8ca-ae51-48cc-82c6-3109710e6226","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:59.744Z","lastSeenAt":"2026-04-23T05:01:11.827Z"}],"details":{"listingId":"fae2f8ca-ae51-48cc-82c6-3109710e6226","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/83 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/83"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/83"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without subscription commitments","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Performing utility operations like geocoding or data validation via micropayment-gated endpoints","Programmatic data export and analytics retrieval paid per request in USDC"],"bestFor":["AI agents that need low-cost, no-signup API access across multiple domains","Developers prototyping with pay-as-you-go endpoints on Base","Web3-native applications that prefer crypto-settled API calls"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integration","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.942Z"},"updatedAt":"2026-04-23T05:01:11.827Z"}}