{"id":"4bc39b8d-10ca-4f82-ab01-c8de8cc978ba","shortId":"CFvbLT","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides x402-protocol access to a Stripe invoice resource (invoice ID 142). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories — all gated behind x402 payment challenges on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/142` is labeled \"Premium API Access\" and accepts POST requests. 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 timeout of 300 seconds. The response MIME type is application/json.\n\nThe platform advertises a flat $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. Documentation pages (/docs, /pricing, /api, /README) all resolve but contain only a \"Connect wallet\" prompt, so detailed request/response schemas and usage documentation are unavailable. The exact data returned by this particular invoice endpoint is unclear — it may return Stripe invoice details or serve as a proxy for Stripe billing operations, but this is speculative given the sparse documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","stripe-invoice","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto-gated API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No request body schema or response schema documented for this endpoint","The specific function of /api/v1/stripe/invoices/142 is unclear — it may be a demo or placeholder","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/142","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of this specific invoice endpoint is 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'/api/v1/stripe/invoices/142':84 '/docs':161 '/pricing':162 '/readme':164 '/request':144 '0.02':10,24,113,143 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x8335':108 '142':45 '20':102 '300':130 '6':118 'Base network API' 'USDC micropayment API' 'accept':91 'access':37,89,158 'across':59 'address':124 'advertis':140 'ai/ml':62 'analyt':61 'api':58,88,149 'application/json':137 'base':8,22,77,104,110 'behind':71 'bill':207 'broader':51 'categori':68 'challeng':74,96 'connect':171 'contain':168 'cost':100 'crypto-gated API' 'data':60,185 'decim':119 'detail':175,199 'document':159,180,216 'endpoint':6,20,30,83,191 'equal':112 'exact':184 'finance/web3':64 'flat':142 'gate':3,17,70 'given':213 'id':44 'indic':97 'infer':63 'infrastructur':66 'instant':157 'invoic':5,19,41,43,190,198 'json-response' 'key':150 'label':86 'limit':153 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':99 'may':195 'mime':134 'minimum':155 'model':146 'network':78 'offer':53 'oper':208 'page':160 'part':48 'particular':189 'pay':9,23,55 'pay-per-call API' 'pay-per-request':54 'payment':73,120 'per':11,25,56,114 'platform':52,139 'post':92 'post-method' 'premium':87 'price':145 'prompt':173 'protocol':36 'provid':33 'proxi':204 'rate':152 'request':12,26,57,93,115 'request/response':176 'resolv':166 'resourc':42 'respons':133 'return':186,196 'schema':177 'second':131 'sent':122 'serv':201 'spars':215 'specif':82 'specul':212 'stripe':4,18,40,197,206 'stripe invoice API' 'stripe-invoice' 'timeout':128 'type':135 'unavail':182 'unclear':193 'unit':105 'usag':179 'usdc':14,28,80,107,116 'usdc-base' 'use':79,117 'util':67 'wallet':172 'x402':2,16,35,72,95 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"bfe24333-26f5-494d-b001-39f47ca891ea","listingId":"4bc39b8d-10ca-4f82-ab01-c8de8cc978ba","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:40.856Z"}],"sources":[{"listingId":"4bc39b8d-10ca-4f82-ab01-c8de8cc978ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:40.856Z","lastSeenAt":"2026-04-25T13:03:04.248Z"}],"details":{"listingId":"4bc39b8d-10ca-4f82-ab01-c8de8cc978ba","quickStartSnippet":"# 1. Send a POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/142\n\n# 2. Parse the 402 response, construct an X-PAYMENT header with a valid\n#    USDC payment proof on Base, then retry:\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/142 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/142"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) resolve but contain only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or interacting with Stripe invoice data via a crypto-payment-gated endpoint","Demonstrating x402 protocol integration for pay-per-request billing","Programmatic invoice access without traditional API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base network","Use cases needing keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Production workflows requiring guaranteed SLAs or support","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.858Z"},"updatedAt":"2026-04-25T13:03:04.248Z"}}