{"id":"359762b8-e34b-45a4-864c-0c08ae82ccda","shortId":"5a5wm8","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","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/stripe/charges/193` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals — consistent with the site's stated flat pricing of $0.02 per request.\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 are priced identically at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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 behavior and response format of the `/api/v1/stripe/charges/193` endpoint (or any other listed endpoint) cannot be determined from available materials. The endpoint is live and returns a valid x402 402 challenge, but what it returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-gateway","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","metered API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI schema or request/response examples provided for any endpoint","The endpoint path '/api/v1/stripe/charges/193' is unexplained — unclear what 'stripe/charges/193' refers to or what the endpoint returns after payment","Cannot verify actual functionality or response format without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/193","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/stripe/charges/193","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 exists and accepts USDC on Base at $0.02/request. However, there is zero documentation on what the endpoint actually does, no request/response schema, no examples, and the docs pages are empty. The endpoint path ('stripe/charges/193') is opaque and unexplained. This is effectively a stub 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'/api/v1/stripe/charges/193':65,216 '/docs':176 '/pricing':178 '/readme':180 '/request':16,34 '0.02':15,33,93,108,157 '000':85 '0x8335':90 '20':84 '402':238 '6':97 'Base network API' 'USDC micropayment API' 'accept':73 'access':71 'actual':209 'advertis':79,114 'ai':9,27,126 'ai-inference' 'analysi':130 'analyt':8,26,120 'api':4,22,46,70,162 'avail':227 'base':7,25,59,86 'base-network' 'behavior':210 'broader':112 'call':45 'cannot':223 'categori':116 'challeng':78,239 'classif':133 'collect':40 'commit':170 'connect':186 'consist':99 'content':192 'convers':150 'cost':82 'crypto-gated API' 'data':119,123 'data-analytics' 'decim':98 'detail':203 'determin':225 'document':171,204 'embed':134 'endpoint':13,31,47,63,118,207,217,222,230 'equal':92 'estim':144 'exampl':200 'exchang':139 'export':124 'extrem':173 'feed':138 'financ':10,28,135 'finance-data' 'flat':105 'format':213 'four':115 'gas':143 'gate':3,21,48 'generat':151 'geocod':148 'given':94 'ident':155 'infrastructur':146 'insight':125 'key':163 'learn':128 'limit':166 'list':67,221 'live':232 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':127 'materi':228 'maximum':81 'metered API' 'metric':121 'minimum':169 'network':60 'no-api-key' 'offer':38 'openapi':196 'page':181 'pay':43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':54,245 'per':44,109,158 'platform':113 'post':74 'post-method' 'premium':69 'price':106,137,154 'prompt':188 'protocol':52 'quot':142 'rate':140,165 'render':183 'report':122 'request':75,110,159 'request/response':199 'respons':212 'return':234,243 'schema':197 'sentiment':129 'settl':53 'site':102 'spars':174 'specif':62 'state':104 'suit':5,23 'summar':132 'text':131 'token':141 'unit':87 'unknown':247 'usdc':18,36,56,89,95 'usdc-settlement' 'util':12,30,147 'utility-services' 'valid':149,236 'via':17,35 'wallet':187 'web3':136 'x402':2,20,51,77,237 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"78ee62f3-6ec4-4f4d-a7d2-24c97952b557","listingId":"359762b8-e34b-45a4-864c-0c08ae82ccda","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/stripe/charges/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:13.090Z"}],"sources":[{"listingId":"359762b8-e34b-45a4-864c-0c08ae82ccda","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:13.090Z","lastSeenAt":"2026-04-23T00:32:06.675Z"}],"details":{"listingId":"359762b8-e34b-45a4-864c-0c08ae82ccda","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/193 \\\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 site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/193"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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 analytics metrics or reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) via micropayments","Fetching real-time crypto gas estimates or token quotes with USDC settlement","Geocoding or data validation as a utility service with no API key required"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access via crypto","Agents or bots that can settle x402 payments autonomously on Base","Users who prefer no rate limits and no API key management"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client","High-volume production workloads where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.103Z"},"updatedAt":"2026-04-23T00:32:06.675Z"}}