{"id":"b3f9e95d-af1d-41ae-8890-9b92c9af11ec","shortId":"jmtLr2","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/56`) suggests it returns or processes a Stripe invoice record (invoice ID 56). Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts HTTP POST requests and returns application/json.\n\nThe parent site lowpaymentfee.com hosts a broader catalog of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all advertised at $0.02 per request with no API keys, no rate limits, and no commitments. However, the docs, pricing, and API pages are essentially empty (showing only a \"Connect wallet\" prompt), so there is no detailed documentation for any of these endpoints, including this one.\n\nBecause this specific endpoint's purpose (Stripe invoice retrieval or processing) is only inferred from the URL path and the generic \"Premium API Access\" description, the actual request body schema and response format are unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payment-gated requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-call","json-response","http-post"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment endpoint","lowpaymentfee","pay-per-request API","Base network API","crypto-gated API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","Request body schema and response format are completely unknown","Endpoint purpose inferred solely from URL path '/api/v1/stripe/invoices/56'; actual behavior unverified","No OpenAPI spec or output schema provided beyond minimal input metadata"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/56","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the endpoint's actual functionality is only inferred from the URL path. The docs pages are 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'0.02':91,147 '000':84 '0x8335':69 '20':83 '2913':70 '56':58 '6':94 'Base network API' 'USDC micropayment endpoint' 'accept':98,240 'access':36,213 'actual':216 'advertis':145 'ai/ml':121 'amount':78 'analysi':123 'analyt':120 'api':35,117,152,165,212 'application/json':104 'base':8,22,64,85 'base-network' 'behind':37 'bodi':218 'broader':111 'call':12,26,81 'catalog':112 'challeng':41,227 'classif':125 'commit':159 'confirm':234 'connect':173 'contract':68 'convers':142 'crypto-gated API' 'data':119 'decim':95 'descript':214 'detail':180 'doc':162 'document':181 'embed':126 'empti':169 'endpoint':6,20,30,97,186,193,236 'equal':90 'essenti':168 'estim':136 'exact':74 'exchang':131 'feed':130 'financ':127 'form':233 'format':222 'gas':135 'gate':3,17,116,243 'generat':143 'generic':210 'geocod':140 'host':109 'howev':160 'http':99 'http-post' 'id':57 'includ':187 'infer':203 'infrastructur':138 'invoic':5,19,54,56,197 'json-response' 'key':153 'limit':156 'live':229 'lowpaymentfee' 'lowpaymentfee.com':32,108 'maximum':77 'network':65 'one':189 'oper':238 'page':166 'parent':106 'path':45,207 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':40,59,242 'payment-g':241 'per':11,25,80,148 'post':100 'premium':34,211 'price':129,163 'process':51,200 'prompt':175 'provid':33 'purpos':195 'quot':134 'rate':132,155 'record':55 'request':101,149,217,244 'requir':79 'resourc':44 'respons':221 'retriev':198 'return':49,103 'schema':219 'scheme':75 'sentiment':122 'settl':61 'show':170 'site':107 'span':118 'specif':43,192 'stripe':4,18,53,196 'stripe invoice API' 'stripe-invoice' 'suggest':47 'summar':124 'token':133 'unit':86 'unknown':224 'url':206 'usdc':14,28,67,88,92 'usdc-settlement' 'use':66,93 'util':139 'valid':141 'via':71 'wallet':174 'web3':128 'well':232 'well-form':231 'x402':2,16,39,73,115,226 'x402 paid API' 'x402-gated':1,15,114 'x402-payment'","prices":[{"id":"1ac30315-6b3a-41c7-86cb-ea2b40aa7593","listingId":"b3f9e95d-af1d-41ae-8890-9b92c9af11ec","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:07.927Z"}],"sources":[{"listingId":"b3f9e95d-af1d-41ae-8890-9b92c9af11ec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:07.927Z","lastSeenAt":"2026-04-25T07:03:30.305Z"}],"details":{"listingId":"b3f9e95d-af1d-41ae-8890-9b92c9af11ec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/56"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/56"},{"claim":"All APIs on the site are advertised at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or processing a specific Stripe invoice via a crypto-gated API call","Demonstrating x402 payment protocol integration with USDC on Base","Agents autonomously paying for invoice data without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call access to invoice data","Projects already using USDC on Base network"],"notFor":["Production invoice management requiring documented schemas and SLAs","Users who need detailed API documentation before integrating","High-volume batch invoice processing (no documented rate limits but no guarantees either)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.543Z"},"updatedAt":"2026-04-25T07:03:30.305Z"}}