{"id":"a2a20909-87bb-44cc-8bac-0ade1e040413","shortId":"7zscH6","kind":"x402","title":"x402-gated premium API endpoint on Base, paid per-call in USDC.","tagline":"x402-gated premium API endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-protocol-gated API services offered by the provider. The specific resource `/api/v1/stripe/charges/9` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a catalog of pay-per-call endpoints spanning 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\nHowever, the specific functionality behind this particular endpoint (`/api/v1/stripe/charges/9`) is unclear. The path suggests it may relate to Stripe charge operations, but no documentation, request schema, or response schema is available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does or what POST body it expects, callers should proceed cautiously.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["payments","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","lowpaymentfee","stripe charges API","Base network 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/9 is unknown; the path implies Stripe charge operations but nothing confirms this.","No request body schema or response schema is provided; callers cannot know what to send or what to expect back.","No OpenAPI spec or AI plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no request/response schema, and the actual functionality of this specific endpoint is unknown. The docs pages are empty beyond a wallet-connect 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'0.02':86,141 '000':77 '20':76 '6':82 'Base network API' 'USDC micropayment endpoint' 'accept':57 'access':55 'actual':210 'advertis':71 'ai':110 'analysi':114 'analyt':104 'api':5,19,41,54,146,189 'avail':186 'base':8,22,66,78 'base-network' 'behind':160 'bodi':215 'broader':90 'call':12,26,100 'caller':218 'catalog':95 'cautious':221 'challeng':70 'charg':175 'classif':117 'commit':154 'connect':198 'content':204 'convers':134 'cost':74 'data':103,107 'decim':83 'doc':188 'document':179 'embed':118 'endpoint':6,20,30,101,137,163,209 'equal':85 'estim':128 'exchang':123 'expect':217 'export':108 'feed':122 'financ':119 'function':159 'gas':127 'gate':3,17,40 'generat':135 'geocod':132 'howev':156 'infrastructur':130 'insight':109 'key':147 'know':206 'label':52 'learn':112 'limit':150 'list':139 'lowpaymentfee' 'lowpaymentfee.com':32,91 'machin':111 'mani':36 'maximum':73 'may':171 'metric':105 'minimum':153 'network':67 'no-api-key' 'offer':43,93 'one':34 'oper':176 'page':193 'paid':9,23 'particular':162 'path':168 'pay':98 'pay-per-cal':97 'pay-per-call' 'pay-per-request API' 'payment':61 'per':11,25,87,99,142 'per-cal':10,24 'platform':92 'post':58,214 'post-endpoint' 'premium':4,18,53 'price':121,190 'proceed':220 'prompt':200 'protocol':39 'provid':46 'quot':126 'rate':124,149 'readm':192 'relat':172 'report':106 'request':59,88,143,180 'requir':155 'resourc':49 'respons':183 'return':195 'schema':181,184 'sentiment':113 'servic':42 'settl':60 'span':102 'specif':48,158 'stripe':174 'stripe charges API' 'substant':203 'suggest':169 'summar':116 'text':115 'token':125 'unclear':166 'unit':79 'usdc':14,28,63,81 'usdc-settlement' 'util':131 'valid':133 'wallet':199 'web3':120 'without':205 'x402':2,16,38,69 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':37","prices":[{"id":"3591e51c-21f9-434f-bf31-c40f05a0d983","listingId":"a2a20909-87bb-44cc-8bac-0ade1e040413","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:35.507Z"}],"sources":[{"listingId":"a2a20909-87bb-44cc-8bac-0ade1e040413","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:35.507Z","lastSeenAt":"2026-04-22T21:31:26.442Z"}],"details":{"listingId":"a2a20909-87bb-44cc-8bac-0ade1e040413","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing a valid X-PAYMENT header (USDC on Base),\n# POST to the resource:\n\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/9 \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/9"},{"claim":"All endpoints listed at $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 endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/9"}],"useCases":["Programmatic access to a premium API resource gated by x402 micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can settle USDC payments on Base","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need clear documentation on request/response schemas before calling","Production workloads requiring well-documented, stable API contracts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.985Z"},"updatedAt":"2026-04-22T21:31:26.442Z"}}