{"id":"1518f399-8d9b-4106-b80b-2dcb663b523c","shortId":"h7zQtE","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment challenge. The specific resource path (`/api/v1/stripe/invoices/169`) suggests it returns or processes a Stripe invoice record (invoice ID 169). Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme challenge requiring up to 0.02 USDC per request (20,000 base units at 6 decimals). The endpoint accepts HTTP POST and returns application/json.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint listed here is scoped to the Stripe invoices path, and no detailed documentation or request/response schemas were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI spec, no request body schema, and no example responses available, the exact input parameters and output format for this endpoint remain unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-call","json-response","http-post"],"categories":["finance","payments"],"synonyms":["stripe invoice API","x402 invoice endpoint","USDC micropayment API","pay-per-request invoice","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI or request/response schema available — input parameters and output format are unknown","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content","The specific purpose of /api/v1/stripe/invoices/169 (a hardcoded invoice ID) is unclear — it may be a demo or test resource","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/169","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational and pricing is clear ($0.02 USDC). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of this specific invoice endpoint is unclear. Effectively a stub 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'0.02':80,130 '000':85 '0x8335':69 '169':58 '20':84 '2913':70 '6':89 'Base network API' 'USDC micropayment API' 'accept':93 'access':36 'advertis':103 'ai/ml':114 'analysi':117 'analyt':113 'api':35,110,135,171 'application/json':98 'avail':201 'base':8,22,64,86 'base-network' 'behind':37 'bodi':195 'broader':100 'call':12,26 'challeng':41,76,216 'classif':119 'commit':143 'confirm':223 'connect':180 'content':186 'contract':68 'crawl':168 'crypto-paid API' 'data':112,122 'decim':90 'detail':159 'doc':170 'document':160 'embed':120 'endpoint':6,20,30,92,147,211,225 'exact':74,203 'exact-schem':73 'exampl':199 'feed':123 'finance/crypto':121 'form':222 'format':208 'found':165 'gate':3,17,109 'howev':144 'http':94 'http-post' 'id':57 'infer':115 'infrastructur':125 'input':204 'invoic':5,19,54,56,155 'json-response' 'key':136 'limit':139 'list':148 'live':218 'lowpaymentfee' 'lowpaymentfee.com':32,101 'minimum':142 'network':65 'openapi':191 'oper':227 'output':207 'page':175 'paramet':205 'path':45,156 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request invoice' 'payment':40,59 'per':11,25,82,131 'platform':102 'post':95 'premium':34 'price':128,172 'process':51 'prompt':182 'provid':33 'rate':138 'readm':174 'record':55 'remain':212 'request':83,132,194 'request/response':162 'requir':77 'resourc':44 'respons':200 'return':49,97,177 'schema':163,196 'scheme':75 'scope':151 'sentiment':116 'settl':61 'span':111 'spec':192 'specif':43,146 'stripe':4,18,53,154 'stripe invoice API' 'stripe-invoices' 'substant':185 'suggest':47 'suit':105 'summar':118 'unit':87 'unknown':213 'usdc':14,28,67,81 'usdc-settlement' 'use':66 'util':126 'wallet':181 'well':221 'well-form':220 'x402':2,16,39,108,215 'x402 invoice endpoint' 'x402-gated':1,15,107 'x402-payment'","prices":[{"id":"3689f63a-3795-4725-8ee7-46b83656b964","listingId":"1518f399-8d9b-4106-b80b-2dcb663b523c","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:50.468Z"}],"sources":[{"listingId":"1518f399-8d9b-4106-b80b-2dcb663b523c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:50.468Z","lastSeenAt":"2026-04-22T20:01:28.963Z"}],"details":{"listingId":"1518f399-8d9b-4106-b80b-2dcb663b523c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/169 \\\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 x402 challenge requires up to 20,000 base units of USDC (0.02 USDC) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/169"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/169"}],"useCases":["Retrieving or processing a specific Stripe invoice via a crypto-paid API call","Integrating pay-per-call invoice access into an agent workflow without API keys","Settling micro-transactions for invoice data on the Base L2 network"],"bestFor":["Agents needing keyless, pay-per-call access to invoice data","Developers experimenting with x402 payment protocol integrations","Workflows requiring on-chain USDC settlement for API access"],"notFor":["Bulk invoice processing requiring thousands of calls (no volume discounts documented)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.408Z"},"updatedAt":"2026-04-22T20:01:28.963Z"}}