{"id":"00bd0a9a-c3c4-4c45-b3aa-3d16a030415b","shortId":"utc8mD","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/156`) behind an x402 paywall. The provider's site advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all settled on the Base network using USDC via the x402 protocol. The specific endpoint listed here appears to be a Stripe invoice retrieval or interaction resource, though no detailed documentation or request/response schema is available beyond the x402 challenge.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is purely payment-gated.\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 spec, no request/response schema beyond the x402 outputSchema stub, and no explanation of what data this particular invoice endpoint returns or what POST body it expects. The endpoint's purpose (Stripe invoice access) is inferred solely from the URL path.","tags":[],"capabilities":["x402-payment-gated","usdc-settlement","base-network","stripe-invoice","per-call-pricing","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI spec or request/response schema provided","The purpose of this specific endpoint (Stripe invoice 156) is unclear — inferred only from URL path","No examples of expected POST body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/156","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of this specific Stripe invoice endpoint is entirely inferred from the URL path. Docs pages return only wallet-connect 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'/api/v1/stripe/invoices/156':39 '/docs':189 '/pricing':191 '/readme':193 '/request':155 '0.02':142,154 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x8335':131 '20':125 '300':167 '6':137 'Base network API' 'USDC micropayment API' 'accept':116 'access':178,242 'across':156 'address':163 'advertis':48,150,177 'ai/ml':61 'analyt':60 'api':57,171 'appear':85 'avail':103 'base':8,22,72,127,133 'base-network' 'behind':40 'beyond':104,214 'bodi':233 'broad':50 'call':12,26,56 'catalog':51 'challeng':107,110 'confirm':111 'connect':199 'consist':145 'content':205 'crypto-gated endpoint' 'data':59,64,224 'decim':138 'detail':97 'document':98,184 'endpoint':6,20,30,82,113,158,228,237 'expect':235 'explan':221 'expos':33 'extrem':186 'finance/web3':63 'flat':151 'gate':3,17,183 'infer':62,244 'interact':93 'invoic':5,19,37,90,227,241 'key':172 'limit':175 'list':83 'live':115 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':122 'network':73 'no-api-key' 'openapi':209 'outputschema':217 'page':194 'particular':226 'path':249 'pay':9,23,54 'pay-per-cal':53 'pay-per-call API' 'payment':123,159,182 'payment-g':181 'paywal':43 'per':11,25,55,143 'per-cal':10,24 'per-call-pricing' 'post':117,232 'post-method' 'price':152 'prompt':201 'protocol':79 'provid':45 'pure':180 'purpos':239 'rate':174 'render':196 'request':118,144 'request/response':100,212 'requir':120 'resourc':38,94 'retriev':91 'return':229 'schema':101,213 'second':168 'sent':161 'servic':67 'settl':69 'sinc':134 'site':47,148 'sole':245 'span':58 'spars':187 'spec':210 'specif':35,81 'stripe':4,18,36,89,240 'stripe invoice API' 'stripe-invoice' 'stub':218 'substant':204 'though':95 'timeout':169 'translat':140 'unit':128 'url':248 'usdc':14,28,75,130,135 'usdc-settlement' 'use':74,136 'util':66 'via':76 'wallet':200 'x402':2,16,42,78,106,109,216 'x402 paid API' 'x402-gated':1,15 'x402-payment-gated'","prices":[{"id":"0e9de99b-b346-4791-8271-564acba7a9c0","listingId":"00bd0a9a-c3c4-4c45-b3aa-3d16a030415b","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:38.442Z"}],"sources":[{"listingId":"00bd0a9a-c3c4-4c45-b3aa-3d16a030415b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:38.442Z","lastSeenAt":"2026-04-25T12:32:37.778Z"}],"details":{"listingId":"00bd0a9a-c3c4-4c45-b3aa-3d16a030415b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/156 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/156"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/156"}],"useCases":["Retrieving or interacting with a specific Stripe invoice via a crypto-settled paywall","Programmatic invoice access without traditional API key registration","Agent-driven payment-gated API consumption on Base L2"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Users who want keyless, pay-as-you-go API access"],"notFor":["Production use requiring documented request/response contracts","Users needing detailed Stripe invoice management features with full documentation","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.982Z"},"updatedAt":"2026-04-25T12:32:37.778Z"}}