{"id":"3c8e6838-603c-45d7-91e8-3e1c2056145c","shortId":"PL2KKb","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 Stripe invoice resource (`/api/v1/stripe/invoices/63`) behind an x402 payment wall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The specific resource appears to be a single Stripe invoice lookup or action, though the exact response payload is undocumented.\n\nThe parent site lowpaymentfee.com advertises a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and utility services. All endpoints are listed at $0.02 per request with no API keys, no rate limits, and settlement on Base. This particular endpoint's x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's uniform pricing.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is live and returns a well-formed x402 challenge, but without documentation it is unclear what POST body is expected or what the response contains beyond the stated MIME type of application/json.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-request endpoint","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only a wallet connect prompt","No OpenAPI spec or request/response schema provided","The exact purpose and expected input for this Stripe invoice endpoint is undocumented","Cannot verify what data or action this endpoint actually returns/performs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/63","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/63","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 with clear pricing ($0.02 USDC on Base), but there is zero documentation on request format, expected POST body, or response schema. The /docs and related pages are empty. The specific purpose of this Stripe invoice endpoint is 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'/api/v1/stripe/invoices/63':38 '/docs':160 '/pricing':162 '/readme':164 '0.02':113,147 '000':138 '20':137 '402':51 '6':143 'Base network API' 'USDC micropayment API' 'action':71 'advertis':83 'ai/ml':96 'analyt':95 'api':92,118 'appear':62 'application/json':227 'avail':189 'base':8,22,57,126,139 'base-network' 'behind':39 'beyond':221 'bodi':213 'broader':85 'call':12,26,45,91 'catalog':86 'challeng':52,132,204 'classif':100 'connect':170 'consist':148 'contain':220 'content':176 'crawl':192 'data':94,104 'decim':144 'document':155,207 'embed':101 'endpoint':6,20,30,109,129,194 'equal':146 'exact':74 'exampl':188 'expect':215 'expos':33 'extrem':157 'finance/crypto':102 'form':202 'gate':3,17 'infer':97 'invoic':5,19,36,68 'key':119 'limit':122 'list':111 'live':196 'lookup':69 'lowpaymentfee' 'lowpaymentfee.com':32,82 'market':103 'maxamountrequir':135 'mime':224 'network':58 'no-api-key' 'openapi':180 'page':165 'paid':9,23 'parent':80 'particular':128 'pay':89 'pay-per-cal':88 'pay-per-call' 'pay-per-request endpoint' 'payload':76 'payment':42,47 'per':11,25,90,114 'per-cal':10,24 'post':212 'price':154 'prompt':172 'rate':121 'render':167 'request':53,115 'request/response':183 'resourc':37,61 'respons':75,219 'return':49,198 'schema':184 'sentiment':98 'servic':107 'settlement':124 'singl':66 'site':81,151 'span':93 'spars':158 'spec':181 'specif':60 'specifi':133 'state':223 'stripe':4,18,35,67 'stripe invoice API' 'stripe-invoice' 'summar':99 'though':72 'type':225 'unclear':210 'undocu':78 'uniform':153 'unit':140 'usag':187 'usdc':14,28,54,142 'usdc-settlement' 'util':106 'wall':43 'wallet':171 'well':201 'well-form':200 'without':46,206 'x402':2,16,41,131,203 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"638289ca-cd65-4c74-9403-8b7edd62c85d","listingId":"3c8e6838-603c-45d7-91e8-3e1c2056145c","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:03.085Z"}],"sources":[{"listingId":"3c8e6838-603c-45d7-91e8-3e1c2056145c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:03.085Z","lastSeenAt":"2026-04-25T07:03:30.047Z"}],"details":{"listingId":"3c8e6838-603c-45d7-91e8-3e1c2056145c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/63\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment proof to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/63"},{"claim":"The site advertises $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/63"},{"claim":"The site lists APIs across data analytics, AI/ML, finance/crypto, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or interacting with a Stripe invoice via a crypto-settled pay-per-call interface","Programmatic invoice access without traditional API key provisioning","Agent-driven payment workflows that settle in USDC on Base"],"bestFor":["Developers or agents that already hold USDC on Base and want keyless API access","Scenarios requiring one-off invoice lookups without subscription commitments","Exploring x402 protocol integrations with Stripe-backed resources"],"notFor":["Production use requiring documented request/response schemas and SLAs","Users who need bulk invoice management or Stripe dashboard-level functionality","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.82Z"},"updatedAt":"2026-04-25T07:03:30.047Z"}}