{"id":"d7e84c54-a199-4554-bfd8-69854f4527a3","shortId":"X6U7cR","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 Stripe invoice resource (`/api/v1/stripe/invoices/94`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts POST requests and returns JSON.\n\nThe specific endpoint listed here appears to be a single Stripe invoice lookup (invoice ID 94), which is distinct from the broader suite of APIs advertised on the lowpaymentfee.com homepage (analytics, AI/ML, finance, infrastructure utilities). The site advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access. The x402 challenge for this particular endpoint specifies a maxAmountRequired of 20,000 base units of USDC (which has 6 decimals), equating to $0.02 per call — consistent with the site's stated pricing.\n\nPayment settles on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The challenge uses the \"exact\" payment scheme with x402 version 1 and a 300-second timeout. Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice-lookup","per-call-payment","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 invoice endpoint","pay-per-call invoice","USDC gated API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The endpoint targets a specific invoice ID (94); unclear if this is a demo or a real resource","No examples of successful responses available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/94","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/94","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of this invoice endpoint (ID 94) is unclear — it may be a demo or a specific resource. Effectively a stub 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'0.02':106,146 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':171 '1':182 '20':134 '300':185 '402':50 '402 payment API' '6':142 '94':81 'Base network API' 'USDC gated API' 'accept':60 'access':122 'across':109 'address':164 'advertis':91,103 'ai/ml':97 'analyt':96 'api':90,115,197 'appear':71 'avail':225 'base':8,22,56,136,160 'behind':39 'broader':87 'call':12,26,44,148 'challeng':51,125,173 'connect':206 'consist':149 'content':212 'contract':169 'crawl':228 'decim':143 'distinct':84 'doc':196 'document':188 'endpoint':6,20,30,59,68,112,129 'equat':144 'exact':176 'exampl':224 'expos':33 'extrem':193 'financ':98 'flat':105 'gate':3,17 'homepag':95 'id':80 'infrastructur':99 'instant':121 'invoic':5,19,36,77,79 'json':65 'json-response' 'key':116 'l2':161 'limit':119 'list':69 'lookup':78 'lowpaymentfee' 'lowpaymentfee.com':32,94 'materi':229 'maxamountrequir':132 'network':57,162 'openapi':216 'page':201 'paid':9,23 'particular':128 'pay-per-call invoice' 'payment':46,156,177 'paywal':42 'per':11,25,107,147 'per-cal':10,24 'per-call-payment' 'post':61 'price':155,198 'prompt':208 'rate':118 'readm':200 'render':203 'request':52,62,108 'request/response':219 'resourc':37 'return':48,64 'schema':220 'scheme':178 'second':186 'settl':157 'singl':75 'site':102,152,191 'spars':194 'spec':217 'specif':67 'specifi':130 'state':154 'stripe':4,18,35,76 'stripe invoice API' 'stripe-invoice-lookup' 'substant':211 'suit':88 'timeout':187 'unit':137 'usag':223 'usdc':14,28,53,139,168 'usdc-base' 'use':166,174 'util':100 'version':181 'wallet':207 'without':45 'x402':2,16,41,124,180 'x402 invoice endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5df5bf66-07b6-44f9-861f-6625704cb388","listingId":"d7e84c54-a199-4554-bfd8-69854f4527a3","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:12.694Z"}],"sources":[{"listingId":"d7e84c54-a199-4554-bfd8-69854f4527a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:12.694Z","lastSeenAt":"2026-04-25T05:33:15.757Z"}],"details":{"listingId":"d7e84c54-a199-4554-bfd8-69854f4527a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/94 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests 20,000 base units of USDC (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/94"},{"claim":"The site advertises $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/94"}],"useCases":["Retrieving Stripe invoice data via a single paid API call","Agent-driven invoice lookups without API key management","Programmatic access to invoice records settled in USDC on Base"],"bestFor":["Agents that need one-off invoice data without subscription overhead","Developers testing x402 payment flows on Base","Crypto-native applications needing Stripe invoice integration"],"notFor":["Bulk invoice processing requiring thousands of calls (no documented batch support)","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.307Z"},"updatedAt":"2026-04-25T05:33:15.757Z"}}