{"id":"6d3554da-84d3-4ea8-abf2-26d167ab17fa","shortId":"2xFaxp","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/88`) behind an x402 payment challenge. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 0.02 USDC per request (20000 base units at 6 decimals). The x402 challenge version is 1, using the \"exact\" payment scheme, with a 300-second timeout.\n\nThe provider, lowpaymentfee.com, offers a broader catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the Stripe invoices endpoint (resource ID 88), whose exact response payload and business logic are not documented in the crawled material.\n\nThe endpoint is live: the probe received a proper HTTP 402 with a well-formed x402 challenge. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this invoice endpoint is unknown beyond what the x402 challenge's outputSchema indicates (HTTP POST, discoverable).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 invoice endpoint","USDC pay-per-call","Base network API","crypto-paid invoice","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content.","Request and response schemas for this specific endpoint are completely unknown.","The purpose and behavior of '/api/v1/stripe/invoices/88' (a hardcoded invoice ID) is unclear — it may be a demo or placeholder resource.","The broader catalog lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live with a valid x402 402 challenge, but there is no documentation, no request/response schema, and no explanation of what the Stripe invoices endpoint actually returns. All doc pages render only 'Connect wallet' with no content. The listing is essentially a stub with confirmed liveness and 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'/api/v1/stripe/invoices/88':38 '/docs':196 '/pricing':197 '/readme':199 '0.02':68,136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':62 '1':83 '20000':72 '300':91 '402':186 '402 payment API' '6':76 '88':161 'Base network API' 'USDC pay-per-call' 'accept':46 'actual':213 'ai/ml':110 'analysi':112 'analyt':109 'api':106,141 'base':8,22,57,73 'base-network' 'behind':39 'beyond':222 'broader':99 'busi':167 'call':12,26,105 'catalog':100 'challeng':43,80,193,226 'classif':114 'commit':148 'connect':204 'content':210 'contract':61 'convers':131 'cost':66 'crawl':174 'crypto-paid invoice' 'data':108 'decim':77 'discover':232 'document':171,194 'embed':115 'endpoint':6,20,30,45,158,177,219 'estim':125 'exact':86,163 'exchang':120 'expos':33 'feed':119 'financ':116 'form':191 'gas':124 'gate':3,17 'generat':132 'geocod':129 'howev':149 'http':185,230 'id':160 'indic':229 'infrastructur':127 'invoic':5,19,36,157,218 'json':51 'json-response' 'key':142 'limit':145 'list':152 'live':179 'logic':168 'lowpaymentfee' 'lowpaymentfee.com':32,96 'materi':175 'maximum':65 'network':58 'no-api-key' 'offer':97 'outputschema':228 'page':195 'pay':10,24,103 'pay-per-cal':9,23,102 'pay-per-call' 'payload':165 'payment':42,52,87 'per':11,25,70,104,137 'post':47,231 'price':118,134 'probe':181 'prompt':206 'proper':184 'provid':95 'quot':123 'rate':121,144 'receiv':182 'request':48,71,138 'request/response':214 'resourc':37,159 'respons':164 'return':50,201 'schema':215 'scheme':88 'second':92 'sentiment':111 'settl':54 'span':107 'specif':151 'stripe':4,18,35,156 'stripe invoice API' 'stripe-invoices' 'substant':209 'summar':113 'timeout':93 'token':122 'unit':74 'unknown':221 'usdc':14,28,60,69 'usdc-settlement' 'use':59,84 'util':128 'valid':130 'version':81 'wallet':205 'web3':117 'well':190 'well-form':189 'whose':162 'x402':2,16,41,79,192,225 'x402 invoice endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e5e4fe3e-55cb-438d-a9ec-f5c58aca5e06","listingId":"6d3554da-84d3-4ea8-abf2-26d167ab17fa","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:10.277Z"}],"sources":[{"listingId":"6d3554da-84d3-4ea8-abf2-26d167ab17fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:10.277Z","lastSeenAt":"2026-04-25T05:33:15.669Z"}],"details":{"listingId":"6d3554da-84d3-4ea8-abf2-26d167ab17fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/88 \\\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":"Endpoint returns HTTP 402 with x402 v1 challenge, exact scheme, Base network, USDC asset at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/88"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/88"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or interacting with a Stripe invoice programmatically via crypto micropayment","Agent-driven invoice access without traditional API key provisioning","Paying per-request for financial document retrieval on Base L2"],"bestFor":["Agents or services that need keyless, pay-per-call access to invoice data","Developers building on Base who want USDC-settled API calls","Workflows requiring no upfront subscription or rate-limit negotiation"],"notFor":["Users needing detailed API documentation or guaranteed SLA before integrating","High-volume invoice processing where per-call pricing may add up","Non-crypto users who cannot settle payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.482Z"},"updatedAt":"2026-04-25T05:33:15.669Z"}}