{"id":"d0dab57b-0bd8-4d8c-b9af-9f4d716bd671","shortId":"PqkHBC","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 via the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/226` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page lists 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. The platform advertises no API keys, no rate limits, instant access, and settlement on the Base network.\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. It is unclear what input the `/api/v1/charges/226` endpoint expects or what it returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is difficult to determine its actual functionality beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto-gated API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty stubs","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific endpoint /api/v1/charges/226 has a generic 'Premium API Access' label with no description of what it actually does","Cannot verify that the advertised AI, analytics, finance, or utility endpoints are functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/226","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/226","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual functionality behind 'Premium API Access' is undocumented and 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'/api/v1/charges/226':57,198 '/docs':160 '/pricing':162 '/readme':164 '/request':16,32 '0.02':15,31,86,135 '000':77 '20':76 '402':212 '6':82 'Base network API' 'USDC API' 'accept':64 'access':62,148,230 'actual':223 'advertis':72,140 'ai':9,25,106 'ai-inference' 'analysi':110 'analyt':8,24,100 'api':4,20,42,61,142,229 'base':7,23,51,68,78,153 'beyond':225 'call':41 'categori':96 'challeng':71,213 'classif':113 'classification' 'collect':36 'connect':170 'content':176 'convers':129 'crypto-gated API' 'data':99,103 'data-analytics' 'decim':83 'detail':187 'determin':221 'difficult':219 'document':155,188,216 'embed':114 'embeddings' 'endpoint':13,29,43,55,98,191,199,206 'equal':85 'estim':124 'exampl':184 'exchang':119 'expect':200 'export':104 'extrem':157 'feed':118 'financ':10,26,115 'finance-data' 'four':95 'function':224 'gas':123 'gate':3,19,44 'generat':130 'generic':227 'geocod':127 'geocoding' 'infrastructur':126 'input':196 'insight':105 'instant':147 'key':143 'label':59,231 'land':92 'learn':108 'limit':146 'list':94 'live':208 'low payment fee' 'lowpaymentfee.com':33 'machin':107 'maxamountrequir':74 'metric':101 'micropayment API' 'network':52,154 'offer':34 'openapi':180 'page':93,165 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payment':66 'per':40,87,136 'platform':139 'premium':60,228 'price':117,133 'prompt':172 'protocol':48 'provid':90 'quot':122 'rate':120,145 'render':167 'report':102 'request':88,137 'request/response':183 'return':204,209 'schema':181 'sentiment':109 'sentiment-analysis' 'settlement':150 'spars':158 'specif':54 'suit':5,21 'summar':112 'text':111 'text-summarization' 'token':121 'unclear':194 'unit':79 'usdc':65,81 'usdc-base' 'util':12,28 'utility-apis' 'valid':128,211 'via':45 'wallet':171 'web3':116 'without':215 'x402':2,18,47,70 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"00f1b553-cc05-474f-b7fc-25abad962f2c","listingId":"d0dab57b-0bd8-4d8c-b9af-9f4d716bd671","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/226","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:38.095Z"}],"sources":[{"listingId":"d0dab57b-0bd8-4d8c-b9af-9f4d716bd671","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/226","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:38.095Z","lastSeenAt":"2026-04-23T10:00:48.142Z"}],"details":{"listingId":"d0dab57b-0bd8-4d8c-b9af-9f4d716bd671","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/226 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/226"},{"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":"The provider lists four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayments","Running analytics queries or data exports on a pay-as-you-go basis","Geocoding or data validation without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access settled in USDC on Base","Agents or bots that need keyless, instant API access via x402","Users who prefer crypto-native micropayment rails over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.877Z"},"updatedAt":"2026-04-23T10:00:48.142Z"}}