{"id":"4e613322-5e38-4362-8b3e-75ebb9eaf25c","shortId":"CU8tUp","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com is an x402-protocol gated API that accepts per-request payments in USDC on the Base network. The specific resource `/api/v1/stripe/charges/93` is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the specified payTo address, and the endpoint returns a JSON response.\n\nThe broader lowpaymentfee.com platform offers a suite of APIs across several 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 required.\n\nThe specific functionality behind the `/api/v1/stripe/charges/93` endpoint is unclear from available documentation. The path suggests it may relate to Stripe charge data or a Stripe-related operation, but no schema, request/response examples, or detailed documentation were found. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Callers should be prepared for the endpoint to accept POST requests and return application/json, but the exact input parameters and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/stripe/charges/93 is unknown; the path suggests Stripe charge data but this is unconfirmed","No request or response schema is provided; callers must discover input parameters by trial","No OpenAPI spec, ai-plugin manifest, or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and no explanation of what the endpoint actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The specific resource path '/api/v1/stripe/charges/93' is opaque. This is effectively a stub 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'0.02':63,156 '000':67 '20':66 '6':73 'Base network API' 'USDC micropayment endpoint' 'accept':41,235 'access':60 'across':115 'address':98 'ai':125 'analysi':129 'analyt':119 'api':5,19,39,59,114,161,211 'application/json':240 'attach':84 'avail':181 'base':8,22,50,68 'behind':174 'broader':107 'call':12,26 'caller':83,227 'categori':117 'charg':191 'classif':132 'commit':169 'connect':220 'content':226 'convers':149 'cost':62 'crypto-paid API' 'data':118,122,192 'decim':74 'detail':205 'doc':210 'document':182,206 'embed':133 'endpoint':6,20,30,101,152,177,233 'estim':143 'exact':81,243 'exampl':203 'exchang':138 'export':123 'feed':137 'financ':134 'found':208 'function':173 'gas':142 'gate':3,17,38 'generat':150 'geocod':147 'handl':77 'header':89 'infrastructur':145 'input':244 'insight':124 'json':104 'json-response' 'key':162 'label':57 'learn':127 'limit':165 'list':154 'lowpaymentfee' 'lowpaymentfee.com':32,108 'machin':126 'may':187 'metric':120 'minimum':168 'network':51 'no-api-key' 'offer':110 'oper':198 'page':215 'paramet':245 'path':184 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':45,75,88,93 'payto':97 'per':11,25,43,64,157 'per-request':42 'platform':109 'post':236 'post-method' 'premium':4,18,58 'premium API access' 'prepar':230 'price':136,212 'prompt':222 'protocol':37 'quot':141 'rate':139,164 'readm':214 'relat':188,197 'report':121 'request':44,65,158,237 'request/response':202 'requir':170 'resourc':54 'respons':105,247 'return':102,217,239 'schema':201 'scheme':82 'sentiment':128 'sever':116 'sign':92 'specif':53,172 'specifi':96 'stripe':190,196 'stripe-rel':195 'structur':248 'substant':225 'suggest':185 'suit':112 'summar':131 'text':130 'token':140 'unclear':179 'unit':69 'unknown':250 'usdc':14,28,47,71 'usdc-base-network' 'util':146 'valid':148 'via':78 'wallet':221 'web3':135 'x':87 'x-payment':86 'x402':2,16,36,80 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':35","prices":[{"id":"347def3a-3d84-487f-a23e-b7ae8de3de2a","listingId":"4e613322-5e38-4362-8b3e-75ebb9eaf25c","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:34.895Z"}],"sources":[{"listingId":"4e613322-5e38-4362-8b3e-75ebb9eaf25c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:34.895Z","lastSeenAt":"2026-04-22T07:01:22.543Z"}],"details":{"listingId":"4e613322-5e38-4362-8b3e-75ebb9eaf25c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/93"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Exploring x402 protocol integration for automated payment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC payments on Base for per-call access","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring fiat-only payment methods with no crypto wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.121Z"},"updatedAt":"2026-04-22T07:01:22.543Z"}}