{"id":"1812fe3e-fe46-490b-953a-ac3d1d2df229","shortId":"TJrJPz","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 challenge. The specific resource path (`/api/v1/stripe/invoices/135`) suggests it returns or processes a Stripe invoice record. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). The endpoint accepts HTTP POST and returns application/json.\n\nlowpaymentfee.com is a broader platform offering multiple x402-gated API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payments settle on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The specific behavior of the `/stripe/invoices/135` endpoint (whether it retrieves an existing invoice, creates one, or performs some other operation) is not documented and must be inferred from the path alone.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-request","json-response","http-post"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 payment API","USDC micropayment","Base network API","pay-per-call API","lowpaymentfee","crypto-gated API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The specific behavior of /api/v1/stripe/invoices/135 is undocumented — unclear whether it retrieves, creates, or modifies an invoice","No example requests or responses available to verify endpoint functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/135","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific purpose of this invoice endpoint is unclear. The docs pages are empty beyond a wallet-connect 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'/api/v1/stripe/invoices/135':46 '/docs':162 '/pricing':163 '/readme':166 '/stripe/invoices/135':199 '0.02':73,136 '000':77 '0x8335':66 '20':76 '2913':67 '6':81 'Base network API' 'USDC micropayment' 'accept':85 'access':36 'advertis':134 'ai/ml':106 'alon':224 'analysi':109 'analyt':105 'api':35,101,141 'application/json':90 'avail':193 'base':8,22,61,78,154 'base-network' 'behavior':196 'behind':37 'broader':94 'call':12,26 'categori':102 'challeng':41 'classif':111 'commit':149 'connect':172 'contract':65 'convers':129 'cost':71 'creat':207 'crypto-gated API' 'data':104,115 'decim':82 'detail':179 'document':157,188,216 'embed':112 'endpoint':6,20,30,84,132,200 'estim':123 'exampl':192 'exchang':118 'exist':205 'extrem':159 'feed':117 'financ':113 'gas':122 'gate':3,17,100 'generat':130 'geocod':127 'http':86 'http-post' 'includ':103 'infer':107,220 'infrastructur':125 'invoic':5,19,54,206 'json-response' 'key':142 'l2':155 'limit':145 'lowpaymentfee' 'lowpaymentfee.com':32,91 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'x402-payment'","prices":[{"id":"cfee9052-461f-4ff9-9a9f-c90941494993","listingId":"1812fe3e-fe46-490b-953a-ac3d1d2df229","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:42.064Z"}],"sources":[{"listingId":"1812fe3e-fe46-490b-953a-ac3d1d2df229","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:42.064Z","lastSeenAt":"2026-04-25T13:03:04.291Z"}],"details":{"listingId":"1812fe3e-fe46-490b-953a-ac3d1d2df229","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/135 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/135"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/135"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or processing Stripe invoice data via a single pay-per-call request","Integrating x402 payment-gated invoice access into agent workflows","Accessing financial data endpoints without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use API access","Quick one-off invoice data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume batch invoice processing where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.803Z"},"updatedAt":"2026-04-25T13:03:04.291Z"}}