{"id":"89ed89d2-8e0a-45cb-9556-498c03ae6b04","shortId":"cDu95P","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment wall. The specific resource path (`/api/v1/stripe/invoices/174`) suggests it returns or processes a Stripe invoice object. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe x402 challenge indicates a maximum amount of 20,000 base units of USDC. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the provider's site-wide pricing of $0.02/request across all their API offerings. The provider advertises no API keys, no rate limits, and instant access; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform lists endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02 per-call price point. However, this specific listing is for the Stripe invoices endpoint only. Documentation pages on the site returned minimal content (just \"Connect wallet\"), so the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoices","per-call-billing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","Request and response schemas are completely unknown; no OpenAPI spec provided","The specific functionality of /api/v1/stripe/invoices/174 is unclear — it may be a demo or placeholder","The site lists many diverse endpoints (AI, finance, geo, etc.) all at $0.02, which may indicate a demo/showcase platform rather than production services"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/174","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the documentation pages are effectively empty. The purpose of this specific Stripe invoices endpoint is unclear beyond its 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'/request':109 '0.02':95,108,174 '000':82 '0x8335':66 '20':81 '2913':67 '6':90 'Base network API' 'USDC micropayment API' 'access':36,126 'across':110,147 'advertis':117 'ai/ml':149 'amount':79 'api':35,113,119 'attach':129 'base':8,22,61,83 'behind':37 'broader':142 'call':12,26,177 'caller':127 'challeng':75 'classif':152 'connect':200 'consist':98 'content':198 'contract':65 'convers':168 'convert':93 'data/analytics':148 'decim':91 'document':191 'embed':153 'endpoint':6,20,30,146,189,209 'estim':162 'exact':71,204 'exchang':157 'feed':156 'finance/web3':154 'gas':161 'gate':3,17 'generat':169 'geocod':166 'header':134 'howev':180 'indic':76 'infrastructur':164 'instant':125 'invoic':5,19,54,188 'key':120 'limit':123 'list':145,183 'lowpaymentfee' 'lowpaymentfee.com':32,143 'maximum':78 'minim':197 'network':62 'no-api-key' 'object':55 'offer':114 'page':192 'path':45 'pay':9,23 'pay-per-call API' 'payment':40,56,133,139 'per':11,25,96,176 'per-cal':10,24,175 'per-call-billing' 'platform':144 'point':179 'premium':34 'price':106,155,178 'process':51 'proof':140 'provid':33,101,116 'quot':160 'rate':122,158 'request':97 'request/response':205 'resourc':44 'return':49,196 'schema':206 'scheme':72 'sentiment':150 'settl':58 'simpli':128 'sinc':87 'site':104,195 'site-wid':103 'specif':43,182 'stripe':4,18,53,187 'stripe invoice API' 'stripe-invoices' 'suggest':47 'summar':151 'token':159 'unit':84 'unknown':211 'usdc':14,28,64,86,88 'usdc-base' 'use':63,89 'util':165 'valid':137,167 'via':68 'wall':41 'wallet':201 'wide':105 'x':132 'x-payment':131 'x402':2,16,39,70,74,138 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"dbbee952-a50c-4d1a-a752-6eabc450a8d6","listingId":"89ed89d2-8e0a-45cb-9556-498c03ae6b04","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:49.280Z"}],"sources":[{"listingId":"89ed89d2-8e0a-45cb-9556-498c03ae6b04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:49.280Z","lastSeenAt":"2026-04-25T10:03:27.410Z"}],"details":{"listingId":"89ed89d2-8e0a-45cb-9556-498c03ae6b04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/174 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/174"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/174"}],"useCases":["Retrieving or processing a Stripe invoice via a pay-per-call x402 gateway","Programmatic invoice access without traditional API key management","Agent-driven payment workflows that settle in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request access to Stripe invoice data","AI agents that can settle x402 payments autonomously on Base","Prototyping micropayment-gated API flows"],"notFor":["Bulk invoice processing requiring thousands of calls (costs add up at $0.02 each)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot produce x402 payment proofs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.416Z"},"updatedAt":"2026-04-25T10:03:27.410Z"}}