{"id":"0d7f5930-ea99-4ec3-bd29-74c09ddd029f","shortId":"t7Nxgr","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/9`) 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 costs $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02), settled on-chain to a designated wallet address. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The x402 challenge specifies a 300-second timeout for payment completion.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories at the same $0.02/request price point, including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services (geocoding, validation, conversion). However, documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The actual behavior and response format of this specific Stripe invoices endpoint is not documented, making it unclear what data it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages are all empty (show only 'Connect wallet')","Response schema and request parameters for /api/v1/stripe/invoices/9 are completely undocumented","It is unclear what data this Stripe invoices endpoint actually returns","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/9","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/9","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 402 challenge, confirming it is operational. However, there is no documentation of request parameters, response schema, or what the Stripe invoices endpoint actually returns. The docs, API, pricing, and README pages are all blank beyond a wallet-connect prompt. The listing is effectively a stub with only the payment challenge as evidence of 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'/request':139 '0.02':72,84,138 '000':76 '20':75 '300':121 '402':50 '6':82 'Base network API' 'USDC micropayment API' 'accept':60 'actual':189 'address':93 'advertis':101,131 'ai/ml':145 'analysi':148 'analyt':144 'api':95,133,172 'attach':104 'base':8,22,56,77 'base-network' 'behavior':190 'behind':39 'beyond':163 'broader':128 'call':12,26,44 'caller':102 'categori':134 'chain':88 'challeng':51,118 'classif':150 'complet':126 'connect':181 'content':187 'convers':160 'cost':71 'crypto payment endpoint' 'data':143,153,207 'decim':83 'design':91 'doc':171 'document':162,202 'embed':151 'empti':169 'endpoint':6,20,30,59,68,199 'essenti':168 'expos':33 'feed':154 'finance/crypto':152 'format':193 'gate':3,17 'geocod':158 'header':109 'howev':161 'includ':142 'infer':146 'invoic':5,19,36,198 'json':65 'json-response' 'key':96 'land':165 'limit':99 'list':69 'lowpaymentfee' 'lowpaymentfee.com':32,129 'make':203 'multipl':132 'network':57 'no-api-key' 'on-chain':86 'page':166,176 'paid':9,23 'pay-per-call API' 'payment':46,108,114,125 'paywal':42 'per':11,25,73 'per-cal':10,24 'per-call-pricing' 'platform':130 'point':141 'post':61 'price':140,173 'prompt':183 'proof':115 'rate':98 'readm':175 'render':178 'request':52,62,74 'resourc':37 'respons':192 'return':48,64,209 'second':122 'sentiment':147 'servic':157 'settl':85 'simpli':103 'specif':67,196 'specifi':119 'stripe':4,18,35,197 'stripe invoice API' 'stripe-invoices' 'substant':186 'summar':149 'timeout':123 'unclear':205 'unit':78 'usdc':14,28,53,80 'usdc-settlement' 'util':156 'valid':112,159 'wallet':92,182 'without':45 'x':107 'x-payment':106 'x402':2,16,41,113,117 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0caac88a-7377-44d1-80aa-66b7bdd8c6dd","listingId":"0d7f5930-ea99-4ec3-bd29-74c09ddd029f","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:13.871Z"}],"sources":[{"listingId":"0d7f5930-ea99-4ec3-bd29-74c09ddd029f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:13.871Z","lastSeenAt":"2026-04-25T05:33:15.782Z"}],"details":{"listingId":"0d7f5930-ea99-4ec3-bd29-74c09ddd029f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/9 \\\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":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/9"},{"claim":"The platform advertises $0.02/request pricing 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/9"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a per-call USDC micropayment","Demonstrating x402 protocol payment flows for API access","Integrating pay-per-use invoice lookups into agent workflows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand Stripe invoice data without API key management","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume invoice processing where subscription pricing is more economical","Users who need detailed API documentation and response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.303Z"},"updatedAt":"2026-04-25T05:33:15.782Z"}}