{"id":"df074676-19e6-4c76-ab9b-91a515aade1f","shortId":"x4Hsw9","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/177`) suggests it returns or processes a Stripe invoice identified by ID 177. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme, with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access. However, the crawled documentation, pricing, and API pages returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schema for this specific invoice endpoint is unknown.\n\nWithout OpenAPI specs, example payloads, or detailed documentation, it is unclear what POST body this endpoint expects or what response it returns beyond the stated MIME type of `application/json`. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-request","json-api"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no technical content","The specific function of /api/v1/stripe/invoices/177 is not documented — it may be a demo or placeholder","No examples of expected POST body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/177","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/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live with a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The purpose of this specific invoice endpoint is unclear beyond its 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'0.02':81,123 '000':85 '0x8335':69 '177':58 '20':84 '2913':70 '402':206 '6':89 'Base network API' 'USDC micropayment API' 'access':36,137 'actual':159 'advertis':95 'ai/ml':107 'analysi':110 'analyt':106 'api':35,103,130,144 'application/json':197 'base':8,22,64,86 'base-network' 'behind':37 'beyond':191 'bodi':182 'broader':92 'call':12,26,125 'challeng':41,207 'classif':112 'confirm':201 'connect':149 'contract':68 'cost':79 'crawl':140 'data':105,116 'decim':90 'detail':156,175 'document':141,176 'embed':113 'emphas':128 'endpoint':6,20,30,166,184,199 'exact':74 'exampl':172 'expect':185 'finance/crypto':114 'gate':3,17 'howev':138 'id':57 'identifi':55 'infer':108 'infrastructur':118 'instant':136 'invoic':5,19,54,165 'json-api' 'key':131 'limit':134 'live':202 'lowpaymentfee' 'lowpaymentfee.com':32,93 'market':115 'maximum':78 'mime':194 'network':65 'openapi':170 'page':145 'path':45 'pay':10,24,100 'pay-per-cal':9,23 'pay-per-call invoice' 'pay-per-request':99 'payload':173 'payment':40,59 'per':11,25,82,101,124 'platform':94,127 'post':181 'premium':34 'price':121,142 'process':51 'prompt':151 'provid':33 'rate':133 'request':83,102 'request/response':160 'resourc':44 'respons':188 'return':49,146,190 'schema':161 'scheme':75 'sentiment':109 'settl':61 'span':104 'spec':171 'specif':43,164 'state':193 'stripe':4,18,53 'stripe invoice API' 'stripe-invoice' 'suggest':47 'suit':97 'summar':111 'technic':155 'type':195 'unclear':179 'unit':87 'unknown':168 'usdc':14,28,67 'usdc-settlement' 'use':66 'util':119 'valid':205 'via':71,203 'wallet':150 'without':169 'x402':2,16,39,73 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"610fc861-5b8f-49bb-ac12-358f576f5ba1","listingId":"df074676-19e6-4c76-ab9b-91a515aade1f","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/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:49.289Z"}],"sources":[{"listingId":"df074676-19e6-4c76-ab9b-91a515aade1f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:49.289Z","lastSeenAt":"2026-04-25T10:03:27.372Z"}],"details":{"listingId":"df074676-19e6-4c76-ab9b-91a515aade1f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/177 \\\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":"Endpoint returns a valid x402 challenge with status 402 and USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/177"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/177"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/177"}],"useCases":["Retrieving or processing a specific Stripe invoice via a crypto-paid 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 API access on Base","Use cases requiring Stripe invoice data behind micropayments"],"notFor":["Production invoice management requiring documented, stable schemas","Users who need fiat-only payment options without crypto wallets","High-volume batch invoice processing (no documented rate limits but no guarantees either)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.457Z"},"updatedAt":"2026-04-25T10:03:27.372Z"}}