{"id":"e431c6d9-a5d3-44b8-8e3b-bf0ac965efd8","shortId":"S5Ynrg","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/charges/164` is listed under the \"Premium API Access\" description in the x402 challenge. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The challenge specifies an exact payment scheme with a max amount of 20,000 base units of USDC (0.02 USD given 6 decimals), paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The actual functionality behind this specific endpoint path (`/stripe/charges/164`) is unclear; it may relate to Stripe charge creation or retrieval, but no schema, request parameters, or response format are documented. The platform appears to be a demonstration or early-stage x402 payment gateway offering multiple API categories at uniform pricing.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["payments","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment required"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet'","The actual functionality of this specific endpoint path is unclear","No request or response schema provided","No examples of successful responses available","Platform may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/164","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/164","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 proper 402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or actual functionality. The docs pages are empty. The specific purpose of '/api/v1/stripe/charges/164' is 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'/request':16,34 '/stripe/charges/164':189 '0.02':15,33,79,149 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':143 '402 payment required' '6':152 'Base network API' 'USDC micropayment endpoint' 'access':7,25,44,99,116 'actual':182 'address':156 'advertis':107 'ai':66 'amount':141 'analyt':65 'api':6,24,43,98,109,227 'appear':213 'attach':119 'base':9,27,87,145,159 'behind':184 'call':4,22 'caller':117 'categori':62,228 'challeng':104,132 'charg':197 'connect':174 'content':180 'creation':198 'crypto-paid API' 'data':64 'decim':153 'demonstr':217 'descript':100 'doc':165 'document':160,210 'earli':220 'early-stag':219 'endpoint':38,55,75,91,187 'exact':135 'extrem':162 'financ':69 'format':208 'function':183 'gateway':224 'given':151 'header':124 'http-post' 'includ':63 'infrastructur':72 'instant':115 'json-response' 'key':110 'learn':68 'limit':113 'list':94 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':67 'mani':54 'max':140 'may':193 'multipl':226 'network':10,28,88 'no-api-key' 'offer':56,225 'one':52 'page':169 'paid':154 'paramet':205 'path':188 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,123,129,136,223 'per':3,21,80 'platform':59,106,212 'premium':5,23,42,97 'price':77,166,231 'prompt':176 'proof':130 'protocol':13,31,49 'provid':41 'rate':112 'readm':168 'relat':194 'render':171 'request':81,204 'respons':207 'retriev':200 'schema':203 'scheme':137 'settl':82 'simpli':118 'span':61 'spars':163 'specif':90,186 'specifi':133 'stage':221 'stripe':196 'unclear':191 'uniform':230 'unit':146 'usd':150 'usdc':18,36,84,148 'usdc-base-network' 'util':73 'valid':127 'via':11,29,45 'wallet':175 'web3':70 'x':122 'x-payment':121 'x402':12,30,47,103,128,222 'x402 API' 'x402-payment'","prices":[{"id":"5ea4d174-34e2-4a13-acf6-d2a0e7a3456d","listingId":"e431c6d9-a5d3-44b8-8e3b-bf0ac965efd8","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:08.322Z"}],"sources":[{"listingId":"e431c6d9-a5d3-44b8-8e3b-bf0ac965efd8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:08.322Z","lastSeenAt":"2026-04-23T02:31:40.232Z"}],"details":{"listingId":"e431c6d9-a5d3-44b8-8e3b-bf0ac965efd8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/164 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/164"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers exploring x402 payment protocol implementations","AI agents needing keyless pay-per-call API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","Production workloads that need well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.353Z"},"updatedAt":"2026-04-23T02:31:40.232Z"}}