{"id":"6a5e3223-81c1-474c-a752-4e28fa2d18ca","shortId":"b4DWp9","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 wall. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/189` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no explanation of what data the Stripe invoices endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","stripe-invoices","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-call endpoint","lowpaymentfee"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The purpose and expected input/output of the /stripe/invoices/189 endpoint is unclear","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/189","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — every doc page just shows 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what the Stripe invoices endpoint actually does or what inputs it expects. Pricing is clear ($0.02/request) but the functional purpose is 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'0.02':109 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '0x8335':104 '20':98 '300':124 '402':201 '6':114 'Base network API' 'USDC micropayment API' 'accept':84 'access':36,135 'actual':192 'addit':164 'address':120 'advertis':134 'ai/ml':61 'analyt':60 'api':35,56,128,150 'base':8,22,76,100,106 'behind':37 'beyond':175 'broader':47 'call':12,26 'challeng':92,178,202 'connect':159 'cost':96 'data':59,64,187 'decim':115 'detail':166 'difficult':210 'doc':149 'document':144,207 'dozen':50 'endpoint':6,20,30,57,82,191,195 'equal':108 'expect':221 'explan':184 'extrem':146 'finance/web3':63 'gate':3,17,69 'grant':137 'header':143 'indic':93 'infer':62 'infrastructur':66 'invoic':5,19,190 'json':89 'json-response' 'key':129 'know':212 'lack':205 'limit':132 'live':197 'lowpaymentfee' 'lowpaymentfee.com':32 'make':208 'maximum':95 'network':77 'offer':49 'openapi':170 'outputschema':180 'page':154 'part':44 'pay':10,24,53 'pay-per-cal':9,23 'pay-per-call endpoint' 'pay-per-request':52 'payload':214 'payment':40,116,142 'per':11,25,54,110 'platform':48 'post':85 'post-method' 'premium':34 'price':151 'prompt':161 'protocol':73 'provid':33 'pure':138 'rate':131 'readm':153 'render':156 'request':55,86,111 'request/response':173 'respons':219 'return':88,193,198 'schema':174 'second':125 'send':216 'sent':118 'span':58 'spars':147 'spec':171 'specif':81 'stripe':4,18,189 'stripe invoice API' 'stripe-invoices' 'stub':181 'technic':165 'timeout':126 'unit':101 'usdc':14,28,79,103,112 'usdc-base' 'use':78,113 'util':67 'valid':200 'via':70 'wall':41 'wallet':160 'x402':2,16,39,72,91,141,177 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1abc811e-e0c5-40dd-ba07-fdd5e773a906","listingId":"6a5e3223-81c1-474c-a752-4e28fa2d18ca","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/189","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":"6a5e3223-81c1-474c-a752-4e28fa2d18ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/189","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:50.468Z","lastSeenAt":"2026-04-25T10:03:27.418Z"}],"details":{"listingId":"6a5e3223-81c1-474c-a752-4e28fa2d18ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/189 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/189"},{"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 address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/189"}],"useCases":["Retrieving Stripe invoice data via a pay-per-request model without API keys","Programmatic access to invoice information settled in USDC on Base","Agent-driven invoice lookups with automatic x402 micropayments"],"bestFor":["Developers wanting keyless, pay-per-call access to invoice data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed API documentation or request/response schemas before integrating","High-volume invoice processing where per-request fees add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.415Z"},"updatedAt":"2026-04-25T10:03:27.418Z"}}