{"id":"688d0900-1549-4132-8aaf-1ab810148ae6","shortId":"gmuhKs","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/17`) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services—all priced at $0.02 per request. However, this specific listing covers only the Stripe invoices endpoint. The site's documentation, pricing, and API reference pages appear to be behind a wallet-connect gate and contain no additional detail beyond the landing page.\n\nBecause the endpoint path references a Stripe invoice by ID, it likely returns invoice metadata or triggers an invoice-related action. The exact request body schema and response format are not documented in any crawled material, so callers should experiment or contact the provider for specifics.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request invoice","lowpaymentfee"],"warnings":["No request or response schema documented; callers must guess the expected POST body","All documentation pages (docs, api, pricing, README) return only a wallet-connect prompt with no content","The endpoint references a specific Stripe invoice ID (17), which may be a demo or placeholder resource","No OpenAPI spec or ai-plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/17","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/17","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and the docs/pricing/API pages are all gated behind wallet-connect with no useful content. The purpose of this specific invoice endpoint is 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'0.02':68,134 '000':73 '0x8335':61 '20':72 '2913':62 '6':77 'Base network API' 'USDC micropayment API' 'accept':45 'action':195 'addit':168 'advertis':105 'ai/ml':118 'analysi':121 'analyt':117 'api':80,114,153 'appear':156 'attach':89 'base':8,22,56,74 'behind':40,159 'beyond':170 'bodi':199 'broader':102 'call':12,26,113 'caller':87,212 'catalog':108 'classif':123 'connect':163 'contact':216 'contain':166 'contract':60 'cost':66 'cover':141 'crawl':209 'data':116,127 'decim':78 'detail':169 'document':150,206 'embed':124 'endpoint':6,20,30,146,176 'exact':197 'experi':214 'expos':33 'finance/crypto':125 'format':203 'gate':3,17,164 'header':94 'howev':137 'id':183 'infer':119 'invoic':5,19,37,145,181,187,193 'invoice-rel':192 'json':50 'json-response' 'key':81 'land':172 'like':185 'limit':84 'list':140 'lowpaymentfee' 'lowpaymentfee.com':32,103 'market':126 'materi':210 'maximum':65 'metadata':188 'network':57 'no-api-key' 'page':155,173 'paid':9,23 'path':177 'pay':111 'pay-per-cal':110 'pay-per-call' 'pay-per-request invoice' 'payment':51,93,99 'paywal':43 'per':11,25,70,112,135 'per-cal':10,24 'platform':104 'post':46 'price':132,151 'proof':100 'provid':218 'rate':83 'refer':154,178 'relat':194 'request':47,71,136,198 'requir':86 'resourc':38 'respons':202 'return':49,186 'schema':200 'sentiment':120 'servic':130 'settl':53 'simpli':88 'site':148 'span':115 'specif':35,139,220 'stripe':4,18,36,144,180 'stripe invoice API' 'stripe-invoice' 'summar':122 'trigger':190 'unit':75 'usdc':14,28,59,69 'usdc-base' 'use':58 'util':129 'valid':97 'wallet':162 'wallet-connect':161 'wide':107 'x':92 'x-payment':91 'x402':2,16,42,98 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"04e175a1-3c62-4c99-86dd-e4e30fa30d7e","listingId":"688d0900-1549-4132-8aaf-1ab810148ae6","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:51.703Z"}],"sources":[{"listingId":"688d0900-1549-4132-8aaf-1ab810148ae6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:51.703Z","lastSeenAt":"2026-04-25T10:03:27.485Z"}],"details":{"listingId":"688d0900-1549-4132-8aaf-1ab810148ae6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/17 \\\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":"The endpoint returns a 402 challenge requesting USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/17"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/17"}],"useCases":["Retrieving or acting on a Stripe invoice programmatically via a crypto-paid API","Demonstrating x402 payment flows for agent-to-agent commerce","Integrating invoice data into automated financial workflows without traditional API keys"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need on-demand invoice access without subscription commitments","Crypto-native applications that prefer USDC micropayments over traditional billing"],"notFor":["Users who need bulk invoice management across many Stripe accounts","Anyone requiring detailed API documentation or guaranteed SLAs before integrating","Non-crypto users who cannot produce an x402 payment header"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.309Z"},"updatedAt":"2026-04-25T10:03:27.485Z"}}