{"id":"9f2ecddd-6886-4d99-8739-80fbb17b94c6","shortId":"88SU34","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/charges/395` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. No API keys or accounts are needed — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\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 material. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it impossible to determine what data or functionality this specific `/charges/395` endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","No OpenAPI or schema definition found; request and response formats are unknown","The specific endpoint /api/v1/charges/395 is labeled 'Premium API Access' but its actual functionality is undocumented","The platform lists many endpoint categories (AI, analytics, finance, utilities) but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/395","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/charges/395","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual functionality of /api/v1/charges/395 is undocumented, making this effectively a stub 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'/api/v1/charges/395':61 '/charges/395':230 '/docs':165 '/pricing':166 '/readme':169 '/request':16,32,151 '0.02':15,31,79,150 '000':73 '20':72 'access':66 'account':86 'actual':232 'advertis':106 'ai':9,25,118 'ai-inference' 'analysi':122 'analyt':8,24,112 'api':4,20,42,65,83 'attach':91 'avail':195 'base':7,23,55,74 'base network api' 'base-network' 'broader':104 'call':41 'caller':89 'categori':108 'challeng':202 'classif':125 'collect':36 'commit':159 'confirm':209 'connect':175 'content':181 'convers':142 'crawl':198 'data':111,115,225 'data-analytics' 'determin':223 'document':160,190,218 'embed':126 'embeddings' 'endpoint':13,29,43,59,110,146,211,231 'estim':136 'exampl':194 'exchang':131 'export':116 'extrem':162 'feed':130 'financ':10,26,127 'finance-data' 'form':208 'four':107 'function':227 'gas':135 'gate':3,19,44 'generat':143 'geocod':140 'geocoding' 'header':96 'i.e':78 'imposs':221 'infrastructur':138 'insight':117 'key':84 'label':63 'lack':216 'learn':120 'limit':156 'list':145 'live':204 'low payment fee' 'lowpaymentfee.com':33 'machin':119 'make':219 'materi':199 'maximum':70 'metric':113 'micropayment api' 'minimum':158 'need':88 'network':56 'no-api-key' 'offer':34 'openapi':185 'oper':213 'page':170 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payment':50,95,101 'per':40,80 'platform':105 'premium':64 'premium api access' 'price':129,152 'prompt':177 'proof':102 'protocol':48 'quot':134 'rate':132,155 'render':172 'report':114 'request':81 'request/response':188 'requir':68 'return':233 'schema':189 'sentiment':121 'sentiment-analysis' 'settl':49 'share':147 'simpli':90 'spars':163 'spec':186 'specif':58,229 'suit':5,21 'summar':124 'text':123 'text-summarization' 'token':133 'unit':75 'usag':193 'usdc':52,77 'usdc api' 'usdc-settlement' 'util':12,28,139 'utility-apis' 'valid':99,141 'wallet':176 'web3':128 'well':207 'well-form':206 'x':94 'x-payment':93 'x402':2,18,47,100,201 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"da4a64d5-c86d-48ef-a343-b45b739ee5a5","listingId":"9f2ecddd-6886-4d99-8739-80fbb17b94c6","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/charges/395","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:18.709Z"}],"sources":[{"listingId":"9f2ecddd-6886-4d99-8739-80fbb17b94c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/395","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:18.709Z","lastSeenAt":"2026-04-23T08:01:18.723Z"}],"details":{"listingId":"9f2ecddd-6886-4d99-8739-80fbb17b94c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/395 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/395"},{"claim":"All listed endpoints are priced at $0.02/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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for analytics metrics or data exports without needing an API key","Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments","Fetching real-time crypto gas estimates or token price quotes via x402","Geocoding or data validation as a utility service with no subscription"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing at $0.02 may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.92Z"},"updatedAt":"2026-04-23T08:01:18.723Z"}}