{"id":"b66a58e1-5c36-470d-8939-1f5b569b745e","shortId":"UXR9UU","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 provides access to a Stripe invoice resource (invoice ID 120) behind an x402 payment wall. The provider operates a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/120` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all endpoints with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 exact data returned by this invoice endpoint is unknown beyond the stated mime type of application/json. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice-access","per-request-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","crypto-gated API","Base network API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found; request body and response structure are entirely unknown","The specific purpose of /api/v1/stripe/invoices/120 is undocumented — it may expose third-party Stripe invoice data, raising potential data-handling concerns","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/120","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/120","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 challenge with clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific invoice endpoint is unclear beyond its URL 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'/api/v1/stripe/invoices/120':90 '/docs':156 '/pricing':158 '/readme':160 '/request':133 '0.02':117,132 '000':106 '0x8335':111 '120':42 '20':105 '2913':112 '402':213 '6':122 'Base network API' 'USDC micropayment API' 'accept':91 'access':34 'across':136 'advertis':100 'ai/ml':66 'analyt':65 'api':61,141 'application/json':204 'avail':187 'base':8,22,81,107,114 'base-network' 'behind':43 'beyond':198 'broader':52 'call':12,26 'challeng':99,214 'commit':149 'confirm':129,208 'connect':166 'cost':103 'crypto-gated API' 'data':64,69,190 'decim':123 'detail':173 'document':151,182 'dozen':55 'endpoint':6,20,30,62,89,138,195,206 'equal':116 'exact':189 'exampl':186 'extrem':153 'finance/web3':68 'flat':131 'gate':3,17,74 'id':41 'infer':67 'invoic':5,19,38,40,194 'json':96 'json-response' 'key':142 'land':127 'limit':145 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':102 'mime':201 'minimum':148 'model':135 'network':82 'no-api-key' 'offer':54 'openapi':177 'oper':50 'page':128,161 'paid':9,23 'pay':58 'pay-per-call API' 'pay-per-request':57 'payment':46 'per':11,25,59,118 'per-cal':10,24 'per-request-pricing' 'platform':53 'post':92 'price':134 'prompt':168 'protocol':78 'provid':33,49,125 'rate':144 'render':163 'request':60,93,119 'request/response':180 'requir':150 'resourc':39 'respons':215 'return':95,191 'schema':181 'servic':72 'settl':84 'span':63 'spars':154 'spec':178 'specif':88 'state':200 'stripe':4,18,37 'stripe invoice API' 'stripe-invoice-access' 'technic':172 'type':202 'unit':108 'unknown':197 'usag':185 'usdc':14,28,86,110,120 'usdc-settlement' 'use':121 'util':71 'valid':212 'via':75,210 'wall':47 'wallet':167 'x402':2,16,45,77,98 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"4c974c1b-9623-4dd6-9d04-392e210ac5ef","listingId":"b66a58e1-5c36-470d-8939-1f5b569b745e","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/120","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":"b66a58e1-5c36-470d-8939-1f5b569b745e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:33.671Z","lastSeenAt":"2026-04-25T14:32:46.770Z"}],"details":{"listingId":"b66a58e1-5c36-470d-8939-1f5b569b745e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/120 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/120"},{"claim":"The provider advertises $0.02/request flat 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/120"}],"useCases":["Retrieving Stripe invoice data without traditional API key management","Agent-driven invoice lookups settled in USDC on Base","Programmatic access to invoice #120 via micropayment"],"bestFor":["Agents or services that need on-demand Stripe invoice data with crypto-native payment","Developers exploring x402 protocol integrations","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing bulk invoice retrieval or batch operations (no documented batch support)","Anyone requiring detailed API documentation or guaranteed SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.204Z"},"updatedAt":"2026-04-25T14:32:46.770Z"}}