{"id":"331d0358-9bfc-43ce-a78d-4591132037da","shortId":"fZpcne","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The endpoint accepts POST requests and charges up to $0.02 per call in USDC (USD Coin), settled on-chain to a specified wallet address. Payment is handled via the x402 protocol's exact scheme — callers include an X-PAYMENT header with a signed payment proof, and the server verifies it before returning the response.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across four 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. This specific endpoint (/api/v1/stripe/charges/8) is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label — it may serve as a generic or demonstration endpoint.\n\nThe x402 challenge confirms the endpoint is live, returning a proper 402 response with version 1 of the x402 protocol. The asset is USDC on Base (contract 0x8335…2913) with a maxAmountRequired of 20000 base units, which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-call-pricing","post-endpoint","no-api-key","no-rate-limits"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment required"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/stripe/charges/8 is undocumented; 'Premium API Access' is a generic label","No request or response schema is provided, so callers cannot know what to send or expect back","The endpoint path includes 'stripe/charges' which is unusual for an x402 endpoint and may indicate a test or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/8","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what this specific endpoint actually does or returns — no OpenAPI schema, no example requests/responses, and the docs/pricing/README pages all render only a 'Connect wallet' prompt. The label 'Premium API Access' is generic and 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'0.02':54,151,231 '0x8335':220 '1':208 '20000':226 '2913':221 '300':241 '402':204 '402 payment required' '6':235 'Base network API' 'USDC micropayment API' 'accept':47 'access':6,20,36,173 'across':110 'address':69 'advertis':105 'ai':120 'analysi':124 'analyt':114 'api':5,19,35,109,156,172 'asset':214 'base':8,22,43,218,227 'behind':37 'beyond':181 'broader':102 'call':12,26,56 'caller':80 'categori':112 'chain':64 'challeng':195 'charg':51 'classif':127 'coin':60 'commit':164 'confirm':196 'contract':219 'convers':144 'crypto-paid API' 'data':113,117 'decim':236 'demonstr':191 'document':180 'embed':128 'endpoint':30,46,147,167,192,198 'equal':230 'estim':138 'exact':78,176 'exchang':133 'export':118 'feed':132 'financ':129 'four':111 'function':177 'gas':137 'gate':3,17 'generat':145 'generic':189 'geocod':142 'given':232 'handl':72 'header':86 'includ':81 'infrastructur':140 'insight':119 'key':157 'label':170,183 'learn':122 'limit':160 'list':149 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32,103 'machin':121 'maxamountrequir':224 'may':185 'metric':115 'minimum':163 'network':44 'no-api-key' 'no-rate-limits' 'on-chain':62 'paid':9,23 'pay-per-call API' 'payment':70,85,90,238 'paywal':40 'per':11,25,55,152 'per-cal':10,24 'per-call-pricing' 'platform':104 'post':48 'post-endpoint' 'premium':4,18,34,171 'price':131 'proof':91 'proper':203 'protocol':76,212 'provid':33 'quot':136 'rate':134,159 'report':116 'request':49,153 'respons':100,205 'return':98,201 'scheme':79 'second':242 'sentiment':123 'serv':186 'server':94 'settl':61 'sign':89 'specif':166 'specifi':67 'suit':107 'summar':126 'text':125 'timeout':239 'token':135 'unit':228 'usd':59 'usdc':14,28,58,216,233 'usdc-on-base' 'util':141 'valid':143 'verifi':95 'version':207 'via':73 'wallet':68 'web3':130 'x':84 'x-payment':83 'x402':2,16,39,75,194,211 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a7092d9c-2359-4ef5-b540-2e131115b02a","listingId":"331d0358-9bfc-43ce-a78d-4591132037da","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:35.508Z"}],"sources":[{"listingId":"331d0358-9bfc-43ce-a78d-4591132037da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:35.508Z","lastSeenAt":"2026-04-22T21:31:26.442Z"}],"details":{"listingId":"331d0358-9bfc-43ce-a78d-4591132037da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/8 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/8"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/8"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need to call APIs without pre-registering for API keys","Programmatic access to utility endpoints with on-chain micropayments","Demonstrating x402 protocol integration for per-request billing"],"bestFor":["Developers exploring x402 protocol integration","AI agents with USDC wallets on Base seeking keyless API access","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed documentation on what the endpoint actually returns","High-volume use cases where $0.02/request adds up significantly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.989Z"},"updatedAt":"2026-04-22T21:31:26.442Z"}}