{"id":"2928ee40-7bae-430b-9c15-ef35cdd5f541","shortId":"jDYvVc","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 specific Stripe invoice resource (`/api/v1/stripe/invoices/157`) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). The payee address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing is for the Stripe invoices endpoint (invoice ID 157), and no documentation exists describing the request body schema or the response payload for this particular route.\n\nThe endpoint is live and returns a valid x402 version-1 challenge. The root site loads successfully (HTTP 200), but the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive documentation. Without request/response schemas or any description of what invoice data is returned, agents must treat this as a low-documentation endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice-data","per-call-pricing","no-api-key","json-response"],"categories":["finance","payments"],"synonyms":["stripe invoice API","x402 invoice endpoint","USDC pay-per-call","Base network API","crypto-gated invoice","lowpaymentfee","402 payment API"],"warnings":["No request or response schema documented — agents cannot know what to send or what they will receive","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no content","Endpoint targets a single hardcoded invoice ID (157); unclear if this is a demo or production resource","No OpenAPI specification available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/157","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/157","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 there is zero documentation on request body, response schema, or what data invoice 157 actually contains. Docs pages are empty (wallet-connect only). No OpenAPI spec, no examples, and the endpoint targets a single hardcoded invoice ID, limiting general 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'/api/v1/stripe/invoices/157':39 '0.02':68,110 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':83 '0x8335':61 '157':136 '20':72 '200':172 '2913':62 '402 payment API' '6':77 'Base network API' 'USDC pay-per-call' 'accept':45 'address':81 'advertis':88 'agent':204 'ai/ml':100 'analyt':99 'api':96,115,176 'base':8,22,56,74 'base-network' 'behind':40 'bodi':144 'broader':85 'call':12,26 'catalog':91 'challeng':165 'commit':123 'connect':185 'contract':60 'cost':66 'crypto-gated invoice' 'data':98,103,201 'decim':78 'describ':141 'descript':197 'doc':175 'document':139,191,212 'endpoint':6,20,30,133,155,213 'exist':140 'expos':33 'finance/web3':102 'gate':3,17,95 'howev':124 'http':171 'id':135 'infer':101 'invoic':5,19,37,132,134,200 'json':50 'json-response' 'key':116 'limit':119 'list':127 'live':157 'load':169 'low':211 'low-document':210 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maximum':65 'minimum':122 'must':205 'network':57 'no-api-key' 'page':180 'paid':9,23 'particular':152 'paye':80 'payload':149 'payment':51 'paywal':43 'per':11,25,70,111 'per-cal':10,24 'per-call-pricing' 'platform':87 'post':46 'price':108,177 'prompt':187 'rate':118 'readm':179 'render':182 'request':47,71,112,143 'request/response':193 'resourc':38 'respons':148 'return':49,159,203 'root':167 'rout':153 'schema':145,194 'servic':106 'settl':53 'site':168 'span':97 'specif':35,126 'stripe':4,18,36,131 'stripe invoice API' 'stripe-invoice-data' 'substant':190 'success':170 'treat':206 'unit':75 'usdc':14,28,59,69 'usdc-settlement' 'use':58 'util':105 'valid':161 'version':163 'wallet':186 'wide':90 'without':192 'x402':2,16,42,94,162 'x402 invoice endpoint' 'x402-gated':1,15,93 'x402-payment'","prices":[{"id":"cd462690-70d7-4e6e-a502-edff1f1077a9","listingId":"2928ee40-7bae-430b-9c15-ef35cdd5f541","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/157","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":"2928ee40-7bae-430b-9c15-ef35cdd5f541","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:42.064Z","lastSeenAt":"2026-04-22T21:31:28.914Z"}],"details":{"listingId":"2928ee40-7bae-430b-9c15-ef35cdd5f541","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/157 \\\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 a valid x402 version-1 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/157"},{"claim":"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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/157"}],"useCases":["Retrieving Stripe invoice data (invoice 157) via a single paid API call","Demonstrating x402 payment-gated API access on Base","Programmatic invoice lookup without traditional API key management"],"bestFor":["Agents or services that need to fetch specific Stripe invoice data without managing API keys","Developers experimenting with x402 payment protocols on Base","Automated workflows that can settle micro-payments in USDC"],"notFor":["Bulk invoice retrieval or querying across multiple invoices","Users who need detailed API documentation or request/response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.804Z"},"updatedAt":"2026-04-22T21:31:28.914Z"}}