{"id":"9b410101-c1b1-4426-a93a-2c43b2f752ee","shortId":"UkJgVJ","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides x402-protocol access to a Stripe invoice resource (invoice #139). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/139` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The x402 challenge was successfully captured with version 1, scheme \"exact\", and a 300-second payment timeout.\n\nThe platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact behavior and response format of this particular invoice endpoint are unknown; there is no OpenAPI spec, no request/response examples, and no detailed documentation available. The endpoint is live (402 challenge confirmed), but what data it actually returns upon successful payment is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 API","USDC payment API","pay-per-call API","lowpaymentfee","Base network API","crypto payment endpoint"],"warnings":["No OpenAPI specification or schema available","All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no content","The exact response payload and request body format are unknown","Purpose of 'Stripe invoice #139' endpoint is unclear — it may be a demo or placeholder","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/139","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/139","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 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response examples, and the purpose of this specific invoice endpoint is ambiguous. Effectively a stub 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'/request':149 '0.02':10,24,123,148 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':103 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '1':134 '139':44 '20':113 '300':139 '402':215 '6':119 'Base network API' 'USDC payment API' 'accept':90 'access':37,88,161 'across':58 'actual':222 'address':102 'advertis':145 'ai/ml':61 'amount':110 'analyt':60 'api':57,87,154,169 'avail':210 'base':8,22,76,100,115 'base-network' 'behavior':187 'broader':50 'captur':131 'chain':98 'challeng':128,216 'confirm':217 'connect':178 'content':184 'contract':106 'crypto payment endpoint' 'data':59,220 'decim':120 'detail':208 'doc':168 'document':163,209 'endpoint':6,20,30,82,195,212 'equal':122 'exact':136,186 'exampl':205 'extrem':165 'finance/web3':63 'format':190 'gate':3,17,68 'howev':162 'infer':62 'infrastructur':65 'instant':160 'invoic':5,19,41,43,194 'key':155 'label':85 'limit':158 'live':214 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':109 'model':151 'network':77 'no-api-key' 'offer':52 'on-chain':96 'openapi':201 'page':173 'part':47 'particular':193 'pay':9,23,54 'pay-per-call API' 'pay-per-request':53 'payment':72,93,141,226 'per':11,25,55,124 'platform':51,144 'post':91 'premium':86 'price':150,170 'prompt':180 'protocol':36,73 'provid':33 'rate':157 'readm':172 'request':12,26,56,92,125 'request/response':204 'requir':111 'resourc':42 'respons':189 'return':175,223 'scheme':135 'second':140 'settl':95 'spars':166 'spec':202 'specif':81 'stripe':4,18,40 'stripe invoice API' 'stripe-invoice' 'substant':183 'success':130,225 'timeout':142 'unclear':228 'uniform':147 'unit':116 'unknown':197 'upon':224 'usdc':14,28,79,105,118 'usdc-settlement' 'use':78,104 'util':66 'version':133 'via':69 'wallet':179 'x402':2,16,35,71,127 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"c002d6ac-5401-477c-b1c6-5aa1506c1648","listingId":"9b410101-c1b1-4426-a93a-2c43b2f752ee","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:43.852Z"}],"sources":[{"listingId":"9b410101-c1b1-4426-a93a-2c43b2f752ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/139","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:43.852Z","lastSeenAt":"2026-04-25T11:32:47.124Z"}],"details":{"listingId":"9b410101-c1b1-4426-a93a-2c43b2f752ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/139 \\\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/139"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/139"},{"claim":"Documentation, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a single micropayment without API key registration","Programmatic access to invoice #139 details for automated billing workflows","Agent-driven payment and data retrieval using x402 protocol on Base"],"bestFor":["Developers wanting keyless, pay-per-request access to invoice data","AI agents that can settle x402 payments on Base in USDC","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schema before purchasing","Bulk invoice retrieval across many invoice IDs (only invoice 139 is exposed at this endpoint)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.693Z"},"updatedAt":"2026-04-25T11:32:47.124Z"}}