{"id":"40ad13c5-5ade-48c3-a074-27dc583c6783","shortId":"8btqhn","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 access to a Stripe invoice resource (invoice ID 125) behind an x402 paywall. The site operates a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/stripe/invoices/125` is listed under the title \"Premium API Access\" and accepts HTTP POST requests. The x402 challenge confirms the endpoint is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation 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 documentation, and no examples of what the invoice endpoint actually returns. The endpoint's exact functionality (whether it retrieves a Stripe invoice, creates one, or proxies some other action) cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-request","no-api-key","http-post"],"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 API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","Exact functionality of /api/v1/stripe/invoices/125 is unclear — could be read, create, or proxy","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/125","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation on what this endpoint actually does or returns. No OpenAPI spec, no request/response examples, and all doc pages render only a wallet-connect prompt. The endpoint's purpose ('Premium API Access' for a Stripe invoice) is 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'0.02':10,24,71,143 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':137 '125':42 '20':131 '2913':138 '300':157 '6':147 'Base network API' 'USDC micropayment API' 'accept':116 'access':34,114 'action':218 'actual':199 'address':153 'ai/ml':61 'analyt':60 'api':57,82,113,166 'attach':91 'avail':223 'base':8,22,79,133,140 'base-network' 'behind':43 'call':73 'caller':89 'cannot':219 'challeng':122 'collect':51 'confirm':123,221 'connect':175 'content':181 'creat':212 'crypto payment endpoint' 'data':59,64 'decim':148 'doc':165 'document':160,190 'endpoint':6,20,30,105,125,198,202 'equal':142 'exact':204 'exampl':193 'extrem':162 'finance/web3':63 'function':205 'gate':3,17 'given':144 'header':96 'http':117 'http-post' 'id':41 'infer':62 'infrastructur':66 'invoic':5,19,38,40,197,211 'key':83 'limit':86 'list':108 'live':127 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':224 'network':80 'no-api-key' 'one':213 'openapi':185 'oper':49 'page':170 'pay':9,23,54 'pay-per-call API' 'pay-per-request':53 'payment':95,101,149 'paywal':46 'per':11,25,55,72 'post':118 'premium':112 'price':69,167 'prompt':177 'proof':102 'provid':33 'proxi':215 'rate':85 'readm':169 'render':172 'request':12,26,56,119,128 'request/response':188 'requir':88 'resourc':39 'retriev':208 'return':200 'schema':189 'second':158 'sent':151 'settl':74 'simpli':90 'site':48 'span':58 'spars':163 'spec':186 'specif':104 'stripe':4,18,37,210 'stripe invoice API' 'stripe-invoice' 'substant':180 'timeout':159 'titl':111 'unit':134 'usdc':14,28,76,136,145 'usdc-settlement' 'util':67 'valid':99 'wallet':176 'whether':206 'x':94 'x-payment':93 'x402':2,16,45,100,121 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"27383521-8f5d-44d6-9bc4-32e0412a2b1f","listingId":"40ad13c5-5ade-48c3-a074-27dc583c6783","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:33.671Z"}],"sources":[{"listingId":"40ad13c5-5ade-48c3-a074-27dc583c6783","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:33.671Z","lastSeenAt":"2026-04-25T14:32:46.790Z"}],"details":{"listingId":"40ad13c5-5ade-48c3-a074-27dc583c6783","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/125 \\\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 x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/125"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/125"},{"claim":"Payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/125"}],"useCases":["Retrieving or interacting with Stripe invoice data via a crypto-settled paywall","Programmatic access to invoice information without traditional API key management","Agent-driven payment and data retrieval in a single HTTP round-trip"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents that can settle x402 payments on Base in USDC","Prototyping crypto-gated API access patterns"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume invoice processing where $0.02/request adds up significantly","Anyone who needs to understand the full response schema before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.197Z"},"updatedAt":"2026-04-25T14:32:46.790Z"}}