{"id":"d235f7ca-153e-480d-b458-6bbe92180670","shortId":"rAewSN","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform follow the same x402 payment model: callers pay per request in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/charges/189` is labeled \"Premium API Access\" in the x402 challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. The x402 challenge version is 1, using the \"exact\" payment scheme, with a maximum timeout of 300 seconds.\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 spec, no request/response schema documentation, and no description of what \"Premium API Access\" actually returns or what parameters it accepts. The endpoint name references \"stripe/charges\" which may relate to Stripe payment processing, but this is speculative. Without documentation or example responses, the actual functionality of this specific endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","post-endpoint","json-response"],"categories":["payments","api-gateway"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC api access","Base network api","micropayment api","stripe charges api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The actual functionality of this specific endpoint ('stripe/charges/189') is completely undocumented","The endpoint path suggests Stripe payment processing but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/189","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what parameters it accepts, or what it returns. The name 'Premium API Access' and path 'stripe/charges/189' are opaque. No OpenAPI spec, no examples, and all doc pages are 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'/api/v1/stripe/charges/189':105 '/docs':170 '/pricing':172 '/readme':174 '0.02':133 '000':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '1':152 '20':122 '300':163 '6':137 'Base network api' 'USDC api access' 'accept':141,210 'access':6,20,36,110,203 'actual':204,233 'ai':62 'amount':117 'analyt':61 'api':5,19,35,57,93,109,202 'application/json':146 'base':8,22,89,124,130 'behind':37 'call':12,26,120 'caller':81 'categori':58 'challeng':114,149 'commit':100 'connect':180 'content':186 'data':60 'decim':138 'descript':198 'document':165,195,228 'endpoint':30,46,71,104,140,212,238 'equal':132 'exact':155 'exampl':230 'extrem':167 'financ':65 'follow':75 'function':234 'gate':3,17 'host':53 'includ':59 'infrastructur':68 'json-response' 'key':94 'label':107 'learn':64 'limit':97 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':63 'mani':45 'maximum':116,160 'may':217 'micropayment api' 'model':80 'name':213 'network':90 'offer':47 'one':43 'openapi':190 'page':175 'paid':9,23 'paramet':208 'pay':82 'pay-per-call api' 'payment':79,156,221 'paywal':40 'per':11,25,83,119 'per-cal':10,24 'per-call-pricing' 'platform':51,74 'post':142 'post-endpoint' 'premium':4,18,34,108,201 'process':222 'prompt':182 'provid':33 'rate':96 'refer':214 'relat':218 'remain':239 'render':177 'request':84,143 'request/response':193 'requir':101,118 'respons':231 'return':145,205 'schema':194 'scheme':157 'second':164 'spars':168 'spec':191 'specif':103,237 'specul':226 'stripe':220 'stripe charges api' 'stripe/charges':215 'timeout':161 'unclear':240 'unit':125 'usd':134 'usdc':14,28,86,127,135 'usdc-base' 'use':136,153 'util':69 'varieti':55 'version':150 'wallet':181 'web3':66 'without':227 'x402':2,16,39,78,113,148 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"77469b1d-4950-4929-92bd-3d57c1a15999","listingId":"d235f7ca-153e-480d-b458-6bbe92180670","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:22.251Z"}],"sources":[{"listingId":"d235f7ca-153e-480d-b458-6bbe92180670","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/189","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:22.251Z","lastSeenAt":"2026-04-23T00:32:07.576Z"}],"details":{"listingId":"d235f7ca-153e-480d-b458-6bbe92180670","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/189\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid x402 payment proof to access.","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/189"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/189"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic per-request API access without API key management","Agent-driven workflows that need pay-as-you-go endpoints settled in USDC on Base","Testing x402 payment protocol integrations"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless, pay-per-call API access","Users who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-call pricing may add up","Anyone needing clarity on what the endpoint actually returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.746Z"},"updatedAt":"2026-04-23T00:32:07.576Z"}}