{"id":"e5a88dfe-4fd5-4e4b-b82b-fa6e7dfd76ac","shortId":"CmZdJb","kind":"x402","title":"Pay-per-call premium API access on Base network via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API access on Base network via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request (20,000 base units of USDC on Base network, 6 decimals), require no API keys or rate limits, and settle payments on-chain.\n\nThe specific endpoint `/api/v1/stripe/charges/57` is listed under the title \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform's homepage advertises a broad suite of services—sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export—all at the same $0.02 price point. Without additional documentation on this particular endpoint's input/output schema, its precise behavior remains unclear.\n\nPayment is handled via the x402 exact scheme on Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns application/json. No API key or account registration is required—callers simply attach an X-PAYMENT header with a valid x402 payment proof.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API payment","Base network API","micropayment API","lowpaymentfee"],"warnings":["Exact functionality of /api/v1/stripe/charges/57 is undocumented—'Premium API Access' is the only description available","No OpenAPI spec, no input schema, no example responses provided","Documentation pages (/docs, /pricing, /README) are empty or require wallet connection to view","The endpoint path includes 'stripe/charges' which is unusual and may indicate a payment-related function rather than a general API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/57","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this specific endpoint does, no input/output schema beyond the generic label \"Premium API Access\", and the docs/pricing/README pages all render only a wallet connect prompt with no useful 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'/request':18,36 '0.02':17,35,79,158 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':194 '20':82 '6':91 'Base network API' 'USDC API payment' 'accept':197 'access':7,25,44,117 'account':207 'addit':162 'address':189 'advertis':132 'ai':66 'analysi':139 'analyt':65 'api':6,24,43,95,116,204 'application/json':202 'attach':213 'base':9,27,84,89,185 'behavior':173 'beyond':125 'broad':134 'call':4,22 'caller':211 'categori':62 'chain':105 'classif':142 'contract':193 'convers':150 'data':64,152 'decim':92 'document':124,163 'embed':143 'endpoint':38,55,75,108,167,196 'exact':120,182 'exchang':146 'export':153 'feed':145 'financ':69 'function':121 'geocod':148 'handl':178 'header':218 'homepag':131 'includ':63 'infrastructur':72 'input/output':169 'json-response' 'key':96,205 'label':127 'learn':68 'limit':99 'list':111 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':67 'mani':54 'micropayment API' 'network':10,28,90,186 'no-api-key' 'no-rate-limits' 'offer':56 'on-chain':103 'one':52 'particular':166 'pay':2,20,187 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,102,176,217,223 'per':3,21,80 'platform':59,129 'point':160 'post':198 'precis':172 'premium':5,23,42,115 'premium API' 'price':77,144,159 'proof':224 'protocol':49 'provid':41 'rate':98,147 'registr':208 'remain':174 'request':81,199 'requir':93,210 'return':201 'schema':170 'scheme':183 'sentiment':138 'servic':137 'settl':13,31,101 'simpli':212 'span':61 'specif':107 'suit':135 'summar':141 'text':140 'titl':114 'unclear':175 'unit':85 'usdc':15,33,87,192 'usdc-base-network' 'use':191 'util':73 'valid':149,221 'via':11,29,45,179 'web3':70 'without':161 'x':216 'x-payment':215 'x402':12,30,47,181,222 'x402 endpoint' 'x402-payment'","prices":[{"id":"e9e5810b-bb0e-497b-a51f-e86b36ebee01","listingId":"e5a88dfe-4fd5-4e4b-b82b-fa6e7dfd76ac","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:33.686Z"}],"sources":[{"listingId":"e5a88dfe-4fd5-4e4b-b82b-fa6e7dfd76ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:33.686Z","lastSeenAt":"2026-04-23T02:01:31.300Z"}],"details":{"listingId":"e5a88dfe-4fd5-4e4b-b82b-fa6e7dfd76ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/57"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without registration or API keys","Making one-off paid API calls settled on-chain in USDC","Integrating pay-per-use endpoints into agent workflows"],"bestFor":["Developers wanting instant API access without signup","Agents that can settle x402 payments on Base","Users who prefer pay-as-you-go over subscriptions"],"notFor":["Users who need detailed documentation on endpoint behavior before paying","High-volume use cases where per-request pricing at $0.02 adds up significantly","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.121Z"},"updatedAt":"2026-04-23T02:01:31.300Z"}}