{"id":"ca1ce347-b816-43df-8f79-3541ae147174","shortId":"ar8VfD","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/146`) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain via the \"exact\" scheme to a specified wallet address, with the asset being USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe specific functionality of this particular endpoint — retrieving or interacting with Stripe invoice #146 — is not documented in the crawled material. The site's docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is unclear what request body this POST endpoint expects or what response payload it returns. The endpoint appears to be one item in a catalog of x402-gated microservices, but the Stripe invoices path does not appear in the site's main listing of available APIs, making its purpose ambiguous.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","stripe-invoice","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto-settled API"],"warnings":["No documentation available for this specific endpoint — docs pages return only 'Connect wallet'","The /api/v1/stripe/invoices/146 path is not listed among the site's advertised APIs","No request body schema or response schema documented","Purpose of 'Stripe invoice #146' is ambiguous — unclear if this is a demo, a real invoice, or a proxy"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/146","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/invoices/146","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). However, there is no documentation for this specific Stripe invoices endpoint, no request/response schema, and the docs pages are empty. The endpoint path doesn't appear in the site's own API listing, making its purpose 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'/request':138 '0.02':130,137 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '146':167 '20':120 '6':126 'Base network API' 'USDC micropayment API' 'accept':88 'access':153 'across':140 'address':105 'advertis':135 'ai/ml':64 'ambigu':249 'amount':117 'analyt':63 'api':59,146,179,245 'appear':216,236 'asset':108 'avail':244 'base':8,22,75,112,122 'base-network' 'behind':40 'bodi':203 'broader':49 'call':12,26 'catalog':223 'chain':96 'challeng':81 'confirm':82 'connect':188 'content':194 'contract':113 'crawl':173 'crypto':67 'crypto-settled API' 'data':62 'decim':127 'doc':178 'document':170,197 'dozen':53 'endpoint':6,20,30,60,84,143,160,206,215 'equal':129 'exact':99 'expect':207 'expos':33 'financ':66 'function':156 'gate':3,17,227 'infer':65 'instant':152 'interact':163 'invoic':5,19,37,166,232 'item':220 'key':147 'limit':150 'list':242 'live':86 'lowpaymentfee' 'lowpaymentfee.com':32 'main':241 'make':246 'materi':174 'maximum':116 'microservic':228 'network':76 'offer':52 'on-chain':94 'one':219 'page':183 'paid':9,23 'part':46 'particular':159 'path':233 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':211 'payment':91 'paywal':43 'per':11,25,57,131 'per-cal':10,24 'platform':50,134 'post':89,205 'post-endpoint' 'price':139,180 'prompt':190 'purpos':248 'rate':149 'readm':182 'request':58,90,132,202 'requir':118 'resourc':38 'respons':210 'retriev':161 'return':185,213 'scheme':100 'servic':70 'settl':72,93 'site':176,239 'span':61 'specif':35,155 'specifi':103 'stripe':4,18,36,165,231 'stripe invoice API' 'stripe-invoice' 'substant':193 'unclear':200 'uniform':136 'unit':123 'usdc':14,28,78,110,125 'usdc-settlement' 'use':77 'util':69 'via':97 'wallet':104,189 'without':195 'x402':2,16,42,80,226 'x402 paid endpoint' 'x402-gated':1,15,225 'x402-payment'","prices":[{"id":"3917b16a-6ff0-47d9-ab25-df63ce6efca4","listingId":"ca1ce347-b816-43df-8f79-3541ae147174","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/invoices/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:44.438Z"}],"sources":[{"listingId":"ca1ce347-b816-43df-8f79-3541ae147174","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:44.438Z","lastSeenAt":"2026-04-25T11:32:47.124Z"}],"details":{"listingId":"ca1ce347-b816-43df-8f79-3541ae147174","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/146 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/146"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/146"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatically accessing a Stripe invoice resource via x402 payment","Integrating pay-per-request invoice data into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or developers needing x402-compatible invoice endpoints","Testing x402 payment protocol integrations on Base","Low-cost per-request API access without API key management"],"notFor":["Users needing documented request/response schemas before integration","Bulk invoice processing requiring high throughput with guaranteed SLAs","Anyone needing non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.692Z"},"updatedAt":"2026-04-25T11:32:47.124Z"}}