{"id":"8f64268b-cc83-4ad7-8f5c-4c310406e48a","shortId":"e6rpku","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that gates access via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/stripe/charges/166` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists four endpoint 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 uniformly priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 header.\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 description of what the specific `/api/v1/stripe/charges/166` endpoint actually returns. The endpoint path suggests it may relate to Stripe charge data, but this is speculative. The x402 challenge is live and well-formed, confirming the endpoint is operational.","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":["api-marketplace","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty stubs","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint path '/api/v1/stripe/charges/166' is not listed on the homepage and its purpose is unclear","No information on rate limits, uptime guarantees, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/166","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/166","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 schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of the specific /api/v1/stripe/charges/166 endpoint is 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'/api/v1/stripe/charges/166':57,203 '/call':16,32 '/docs':171 '/pricing':173 '/readme':175 '0.02':15,31,92,143 '000':82 '0x8335':70 '20':81 '2913':71 '6':87 'Base network API' 'USDC API access' 'accept':65 'access':43,63,157 'actual':205 'advertis':77,148 'ai':9,25,111 'ai-inference' 'analysi':115 'analyt':8,24,105 'api':4,20,39,62,150 'base':7,23,51,73,83 'categori':38,103 'challeng':76,224 'charg':216 'classif':118 'classification' 'confirm':231 'connect':181 'content':187 'contract':69 'convers':135 'data':104,108,217 'data-analytics' 'decim':88 'descript':198 'document':166 'embed':119 'embeddings' 'endpoint':13,29,55,102,138,204,208,233 'entir':161 'equal':91 'estim':129 'exampl':195 'exchang':124 'export':109 'extrem':168 'feed':123 'financ':10,26,120 'finance-data' 'form':230 'four':101 'gas':128 'gate':3,19,42 'generat':136 'geocod':133 'geocoding' 'handl':160 'header':165 'infrastructur':131 'insight':110 'instant':156 'key':151 'land':98 'learn':113 'limit':154 'list':59,100 'live':226 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':112 'maxamountrequir':79 'may':212 'metric':106 'micropayment API' 'multi':37 'multi-categori':36 'network':52 'openapi':191 'oper':235 'page':99,176 'path':209 'pay-per-call API' 'pay-per-request' 'payment':47,66,158 'per':93,144 'platform':40,147 'premium':61 'price':122,141 'prompt':183 'protocol':48 'provid':96 'quot':127 'rate':125,153 'relat':213 'render':178 'report':107 'request':94,145 'request/response':194 'return':206 'schema':192 'sentiment':114 'sentiment-analysis' 'spars':169 'specif':54,202 'specul':221 'stripe':215 'suggest':210 'suit':5,21 'summar':117 'text':116 'text-summarization' 'token':126 'uniform':140 'unit':84 'usdc':68,90 'usdc-base' 'util':12,28,132 'utility-apis' 'valid':134 'via':44 'wallet':182 'web3':121 'well':229 'well-form':228 'x402':2,18,46,75,164,223 'x402 API marketplace' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"8dab3373-675c-47bc-8a48-d53d32620a66","listingId":"8f64268b-cc83-4ad7-8f5c-4c310406e48a","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:10.116Z"}],"sources":[{"listingId":"8f64268b-cc83-4ad7-8f5c-4c310406e48a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:10.116Z","lastSeenAt":"2026-04-22T20:01:24.864Z"}],"details":{"listingId":"8f64268b-cc83-4ad7-8f5c-4c310406e48a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/166 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/166"},{"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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/166"}],"useCases":["Accessing analytics metrics and reports on a per-call basis without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) with crypto micropayments","Fetching financial data like exchange rates, token quotes, and gas estimates via x402","Geocoding and data validation utilities paid per request"],"bestFor":["Developers wanting API access without signup or API key provisioning","Agents and bots that can pay per call using x402 on Base","Users who need low-cost, no-commitment access to a variety of utility endpoints"],"notFor":["Production workloads requiring documented SLAs, rate limits, or guaranteed uptime","Users who need detailed API documentation or response schema before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.336Z"},"updatedAt":"2026-04-22T20:01:24.864Z"}}