{"id":"fc4bd0ff-cbd8-4604-a071-56fb9e01b329","shortId":"LFemf3","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 pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 protocol, settling payments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/charges/39` is listed as \"Premium API Access\" in the x402 challenge. The maximum amount required is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. The platform advertises uniform $0.02/request pricing across all its APIs with no API keys, no rate limits, and instant access. The endpoint accepts POST requests and returns application/json responses.\n\nImportantly, the exact functionality behind this particular endpoint path (`/stripe/charges/39`) is unclear — the name \"Premium API Access\" is generic and 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 on the site all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the actual input parameters and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["api","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access","stripe charges api"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content.","The actual functionality of /api/v1/stripe/charges/39 is unknown; 'Premium API Access' is a generic label.","No request or response schema is provided; callers cannot know what to send or what to expect back.","No OpenAPI spec or AI plugin manifest found.","The path includes 'stripe/charges' which may imply Stripe-related operations, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is no documentation, no request/response schema, and the endpoint's actual functionality is entirely unclear. The site's docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':129 '/stripe/charges/39':163 '0.02':121,128 '000':110 '20':109 '6':117 'USDC micropayment api' 'accept':147 'access':6,20,36,99,144,170 'across':131 'actual':219 'advertis':126 'ai':65 'amount':106 'analyt':64 'api':5,19,35,61,98,134,137,169,196 'application/json':152 'avail':193 'base':8,22,88,111 'base network api' 'base-network' 'behind':37,158 'call':12,26 'challeng':103 'charg':182 'connect':208 'content':214 'data':63 'decim':118 'doc':195 'document':186,217 'endpoint':30,46,74,92,146,161 'equat':119 'exact':156 'financ':68 'format':224 'function':157 'gate':3,17 'generic':172 'host':53 'import':154 'infrastructur':71 'input':220 'instant':143 'json-response' 'key':138 'learn':67 'limit':141 'list':95 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':66 'mani':45 'maximum':105 'may':178 'name':167 'network':89 'offer':47 'one':43 'oper':183 'page':200 'paid':9,23 'paramet':221 'particular':160 'path':162,175 'pay':58 'pay-per-call api' 'pay-per-request':57 'payment':83 'paywal':40 'per':11,25,59,122 'per-cal':10,24 'platform':51,77,125 'post':148 'post-method' 'premium':4,18,34,97,168 'premium api access' 'price':130,197 'prompt':210 'protocol':81 'provid':33 'rate':140 'readm':199 'relat':179 'remain':225 'request':60,123,149,187 'requir':107 'respons':153,190,223 'return':151,205 'schema':188,191 'settl':82 'site':203 'span':62 'specif':91 'stripe':181 'stripe charges api' 'substant':213 'suggest':176 'unclear':165 'uniform':127 'unit':112 'unknown':226 'usdc':14,28,85,114 'usdc-settlement' 'use':78,116 'util':72 'varieti':55 'wallet':209 'web3':69 'without':215 'x402':2,16,39,80,102 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8e080107-5ce6-4fe0-af2c-379df3e481a5","listingId":"fc4bd0ff-cbd8-4604-a071-56fb9e01b329","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:17.439Z"}],"sources":[{"listingId":"fc4bd0ff-cbd8-4604-a071-56fb9e01b329","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:17.439Z","lastSeenAt":"2026-04-22T07:01:21.641Z"}],"details":{"listingId":"fc4bd0ff-cbd8-4604-a071-56fb9e01b329","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/39"},{"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 asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/39"},{"claim":"Docs, API, pricing, and README pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with a low-cost per-call endpoint","Testing x402 payment flows on Base with USDC"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need keyless, pay-per-call API access","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users who need well-documented API contracts with clear input/output schemas","High-volume production workloads requiring guaranteed SLAs and rate limit transparency","Anyone needing to understand exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.881Z"},"updatedAt":"2026-04-22T07:01:21.641Z"}}