{"id":"6eab3ad3-1bae-4ea9-8642-cf571a9df50b","shortId":"PyCZ4g","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/13`) behind an x402 payment wall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The price per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per call. Payment is sent to the on-chain address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nThe parent site lowpaymentfee.com advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint (`/api/v1/stripe/invoices/13`) is labeled \"Premium API Access\" and its exact response payload is undocumented. No OpenAPI schema, request body specification, or example responses were found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint path references a Stripe invoice by ID, it likely returns invoice data or triggers an invoice-related action, but the precise functionality cannot be confirmed from available materials. Agents should treat this as a single-shot POST endpoint that returns `application/json` after a valid x402 USDC payment on Base.","tags":[],"capabilities":["x402-payment","usdc-on-base","stripe-invoice-access","per-call-pricing","no-api-key","post-endpoint"],"categories":["finance","payments"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No OpenAPI schema or request/response documentation available","Docs, pricing, and API pages return only 'Connect wallet' with no content","The exact behavior and response payload of /api/v1/stripe/invoices/13 is undocumented","Endpoint path suggests access to a specific Stripe invoice but this is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/13","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation of the request body, response schema, or what 'Premium API Access' actually returns. The docs pages are empty stubs. The specific functionality of this Stripe invoice endpoint is 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'0.02':75,128 '000':66 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':88 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':93 '20':65 '402':52 '6':71 'Base network API' 'USDC micropayment API' 'access':150 'action':210 'address':87 'advertis':100 'agent':221 'ai/ml':112 'analysi':115 'analyt':111 'api':108,133,149,176 'application/json':234 'avail':219 'base':8,22,58,67,95,242 'behind':40 'bodi':162 'broad':102 'call':12,26,46,78 'cannot':215 'catalog':103 'chain':86 'challeng':53 'classif':117 'commit':140 'confirm':217 'connect':182 'content':188 'contract':92 'crawl':171 'data':110,120,203 'decim':72 'doc':173 'embed':118 'endpoint':6,20,30,144,191,231 'equal':74 'exact':153 'exampl':165 'expos':33 'feed':121 'finance/crypto':119 'found':168 'function':214 'gate':3,17,107 'howev':141 'id':198 'infer':113 'invoic':5,19,37,196,202,208 'invoice-rel':207 'key':134 'label':147 'like':200 'limit':137 'lowpaymentfee' 'lowpaymentfee.com':32,99 'materi':220 'network':59 'no-api-key' 'on-chain':84 'openapi':159 'page':177 'paid':9,23 'parent':97 'path':192 'pay-per-call invoice' 'payload':155 'payment':43,48,79,240 'per':11,25,62,77,129 'per-cal':10,24 'per-call-pricing' 'post':230 'post-endpoint' 'precis':213 'premium':148 'price':61,126,174 'prompt':184 'rate':136 'refer':193 'relat':209 'request':54,63,130,161 'resourc':38 'respons':154,166 'return':50,179,201,233 'schema':160 'sent':81 'sentiment':114 'servic':124 'shot':229 'singl':228 'single-shot':227 'site':98 'span':109 'specif':35,143,163 'stripe':4,18,36,195 'stripe invoice API' 'stripe-invoice-access' 'substant':187 'summar':116 'treat':223 'trigger':205 'undocu':157 'unit':68 'usd':76 'usdc':14,28,55,70,91,239 'usdc-on-base' 'use':89 'util':123 'valid':237 'wall':44 'wallet':183 'without':47 'x402':2,16,42,106,238 'x402 paid endpoint' 'x402-gated':1,15,105 'x402-payment'","prices":[{"id":"c510c559-7f22-4484-8f28-b4b9ad1a802c","listingId":"6eab3ad3-1bae-4ea9-8642-cf571a9df50b","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:43.852Z"}],"sources":[{"listingId":"6eab3ad3-1bae-4ea9-8642-cf571a9df50b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:43.852Z","lastSeenAt":"2026-04-22T19:32:01.298Z"}],"details":{"listingId":"6eab3ad3-1bae-4ea9-8642-cf571a9df50b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/13\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid USDC payment proof on Base to access the resource.","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 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/13"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The parent site lists APIs across data analytics, AI/ML, finance/crypto, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or interacting with a specific Stripe invoice via a crypto-paid API call","Programmatic invoice access without traditional API key authentication","Agent-driven payment workflows that settle in USDC on Base"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers exploring pay-per-call API patterns without subscription overhead","Automated workflows needing Stripe invoice data without managing API keys"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","High-volume batch invoice retrieval where per-call costs add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.748Z"},"updatedAt":"2026-04-22T19:32:01.298Z"}}