{"id":"3e3abefa-4fa9-49c7-97aa-96c4d2f8632a","shortId":"BvL7KJ","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/113`) behind an x402 payment wall. The provider operates a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC via the x402 protocol.\n\nThe specific endpoint listed here is described only as \"Premium API Access\" and returns invoice-related data in JSON format when called via POST with a valid X-PAYMENT header. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). This matches the provider's stated flat pricing of $0.02 per request across all endpoints. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the invoice endpoint actually returns or what parameters it accepts. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice-access","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API","crypto-paid endpoint"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or input/output schema available — request parameters and response format are unknown","The endpoint path references a specific invoice ID (113); unclear if this is parameterized or fixed","Provider platform lists many endpoints but this specific one (/stripe/invoices/113) is not listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/113","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02/request in USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the endpoint actually returns or accepts. The endpoint path suggests Stripe invoice data but this is 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'0.02':127,145 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '20':121 '402':210 '6':134 'Base network API' 'USDC micropayment API' 'accept':204 'access':92 'across':148 'actual':198 'address':155 'advertis':116 'ai/ml':62 'analyt':61 'api':58,91,166 'base':8,22,73,123,158 'base-network' 'behind':40 'broader':49 'call':12,26,57,103 'captur':212 'challeng':115,211 'confirm':208 'connect':175 'content':181 'cost':119 'crypto':65 'crypto-paid endpoint' 'data':60,98 'decim':135 'describ':87 'descript':192 'difficult':220 'doc':165 'document':160,217 'dozen':52 'endpoint':6,20,30,83,150,197,206 'exampl':189 'experiment':224 'expos':33 'extrem':162 'financ':64 'flat':142 'format':101 'gate':3,17 'header':112 'infer':63 'invoic':5,19,37,96,196 'invoice-rel':95 'json':100 'json-response' 'lack':215 'list':84 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32 'mainnet':159 'make':218 'match':137 'maximum':118 'network':74 'no-api-key' 'offer':51 'openapi':185 'oper':47 'page':170 'paramet':202 'pay':9,23,55 'pay-per-cal':54 'pay-per-call' 'pay-per-request API' 'payment':43,111,151 'per':11,25,56,129,146 'per-cal':10,24 'platform':50 'post':105 'premium':90 'price':143,167 'prompt':177 'protocol':80 'provid':46,139 'readm':169 'relat':97 'render':172 'request':130,147 'request/response':188 'resourc':38 'return':94,199 'schema':186 'sent':153 'servic':68 'settl':70 'sinc':131 'span':59 'spars':163 'specif':35,82 'state':141 'stripe':4,18,36 'stripe invoice API' 'stripe-invoice-access' 'substant':180 'unit':124 'usd':128 'usdc':14,28,76,126,132 'usdc-settlement' 'use':75,133,222 'util':67 'valid':108 'via':77,104 'wall':44 'wallet':176 'without':223 'x':110 'x-payment':109 'x402':2,16,42,79,114 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b58a4406-7d46-467c-9061-2294f28cb7a9","listingId":"3e3abefa-4fa9-49c7-97aa-96c4d2f8632a","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:27.059Z"}],"sources":[{"listingId":"3e3abefa-4fa9-49c7-97aa-96c4d2f8632a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:27.059Z","lastSeenAt":"2026-04-25T16:03:44.564Z"}],"details":{"listingId":"3e3abefa-4fa9-49c7-97aa-96c4d2f8632a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/113 \\\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/113"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/113"},{"claim":"Provider advertises $0.02 per request flat pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"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 crypto-settled micropayment","Programmatic access to invoice #113 without traditional API keys","Agent-driven payment-gated data retrieval on Base"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that can settle USDC payments on Base for per-call API access","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or schema before integrating","Bulk invoice retrieval or batch operations (single invoice endpoint)","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.509Z"},"updatedAt":"2026-04-25T16:03:44.564Z"}}