{"id":"1331c81e-37d8-42b4-a94b-61c03a9d92e3","shortId":"KqRmhS","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 126) behind an x402 paywall. The site operates a suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/stripe/invoices/126` is listed under the title \"Premium API Access.\" The x402 challenge confirms it accepts POST requests, requires up to 20,000 base units of USDC (0x8335…on Base, 6 decimals → $0.02), and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation on the site is extremely thin — 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 documentation, and no example payloads available. The actual data returned by this endpoint after successful payment is unknown; the description \"Premium API Access\" and the path segment \"stripe/invoices\" suggest it may return or interact with Stripe invoice data, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","stripe-invoice","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The actual data returned by this endpoint after payment is unknown","Endpoint path suggests Stripe invoice interaction but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/126","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind \"Premium API Access\" / \"stripe/invoices/126\" is opaque. Docs pages return only wallet-connect 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'0.02':10,24,71,140 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':135 '126':42 '20':129 '300':158 '6':138 'Base network API' 'USDC micropayment API' 'accept':123 'access':34,117,216 'actual':201 'address':149 'ai/ml':61 'analyt':60 'api':57,83,116,170,215 'application/json':143 'attach':94 'avail':199,238 'base':8,22,80,131,137 'behind':43 'call':56 'caller':92 'cannot':234 'challeng':120 'commit':89 'confirm':121,236 'connect':179 'content':185 'data':59,64,202,231 'decim':139 'descript':213 'doc':169 'document':161,194 'endpoint':6,20,30,108,206 'exact':153 'exampl':197 'extrem':166 'finance/web3':63 'gate':3,17 'header':99 'id':41 'infer':62 'infrastructur':66 'interact':227 'invoic':5,19,38,40,230 'json-response' 'key':84 'limit':86 'list':111 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':239 'may':224 'network':81 'no-api-key' 'openapi':189 'oper':49 'page':174 'path':219 'pay':9,23,54 'pay-per-cal':53 'pay-per-call API' 'pay-per-request' 'payload':198 'payment':98,104,145,154,209 'paywal':46 'per':13,27,55,72 'post':124 'premium':115,214 'premium API access' 'price':69,171 'prompt':181 'proof':105 'provid':33 'rate':85 'readm':173 'render':176 'request':14,28,73,125 'request/response':192 'requir':91,126 'resourc':39 'return':142,203,225 'schema':193 'scheme':155 'second':159 'segment':220 'sent':147 'settl':75 'simpli':93 'site':48,164 'span':58 'spec':190 'specif':107 'stripe':4,18,37,229 'stripe invoice API' 'stripe-invoice' 'stripe/invoices':221 'success':208 'suggest':222 'suit':51 'thin':167 'timeout':160 'titl':114 'unit':132 'unknown':211 'upfront':88 'usdc':12,26,77,134 'usdc-base' 'use':151 'util':67 'valid':102 'wallet':180 'x':97 'x-payment':96 'x402':2,16,45,103,119 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e4a19ca1-e978-402e-9094-6620518d16cb","listingId":"1331c81e-37d8-42b4-a94b-61c03a9d92e3","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:36.629Z"}],"sources":[{"listingId":"1331c81e-37d8-42b4-a94b-61c03a9d92e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:36.629Z","lastSeenAt":"2026-04-25T13:03:04.058Z"}],"details":{"listingId":"1331c81e-37d8-42b4-a94b-61c03a9d92e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/126 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/126"},{"claim":"All APIs on the site are priced at $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/126"}],"useCases":["Retrieving Stripe invoice data programmatically via a single micropayment","Agent-driven access to paid API resources without pre-registration or API keys","Demonstrating x402 payment protocol integration on Base network"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access on Base","Projects requiring Stripe invoice data without subscription overhead"],"notFor":["Production workloads requiring documented request/response schemas","Users who need non-crypto payment options","High-volume batch processing where per-request fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.08Z"},"updatedAt":"2026-04-25T13:03:04.058Z"}}