{"id":"f1daee59-e2d5-4ceb-8a76-8fffa105d93b","shortId":"hRBthJ","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 provides \"Premium API Access\" behind an x402 payment wall. The specific resource path (`/api/v1/stripe/invoices/145`) suggests it returns or processes a Stripe invoice record. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC, which with 6 decimals equals $0.02 USD per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified.\n\nThe x402 challenge was successfully captured (HTTP 402 with a well-formed accepts block), confirming the endpoint is live. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI spec, request/response schemas, or example payloads are available, so the exact input parameters and output format for this invoice endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema available — request parameters and response format are unknown","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content","The specific behavior of /api/v1/stripe/invoices/145 is unclear — it may be a demo or placeholder","No examples or error handling documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/145","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of this invoice endpoint is only inferable from the URL path. Effectively a stub 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'0.02':93,142 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':214 '0x8335':66 '20':82 '2913':67 '300':217 '402':195 '6':90 'Base network API' 'USDC micropayment API' 'accept':201 'access':36 'actual':178 'address':213 'advertis':101 'ai/ml':113 'amount':77 'analysi':116 'analyt':112 'api':35,109,147,162 'avail':229 'base':8,22,61,84 'base-network' 'behavior':179 'behind':37 'block':202 'broader':98 'call':12,26,80 'captur':193 'challeng':190 'classif':118 'commit':155 'confirm':203 'connect':169 'content':175 'contract':65 'convers':135 'crawl':158 'data':111,121 'decim':91 'direct':211 'doc':161 'document':159 'embed':119 'endpoint':6,20,30,138,185,205,241 'equal':92 'estim':129 'exact':72,232 'exact-pay':71 'exampl':226 'exchang':124 'feed':123 'finance/web3':120 'form':200 'format':237 'gas':128 'gate':3,17 'generat':136 'geocod':133 'howev':156 'http':194 'infer':114 'infrastructur':131 'input':233 'invoic':5,19,54,240 'key':148 'limit':151 'list':140 'live':207 'lowpaymentfee' 'lowpaymentfee.com':32,99 'maximum':76 'minimum':154 'network':62 'no-api-key' 'openapi':221 'output':236 'page':160 'paramet':234 'path':45 'pay':10,24,106 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':105 'payload':227 'payment':40,56,73,209 'per':11,25,79,95,107,143 'platform':100 'premium':34 'price':122,163 'process':51 'prompt':171 'provid':33 'quot':127 'rate':125,150 'readm':164 'record':55 'remain':186 'request':96,108,144 'request/response':223 'requir':78 'resourc':44 'respons':181 'return':49,166 'schema':182,224 'scheme':74 'second':218 'sentiment':115 'settl':58 'span':110 'spec':222 'specif':43 'stripe':4,18,53 'stripe invoice API' 'stripe-invoice' 'substant':174 'success':192 'suggest':47 'suit':103 'summar':117 'timeout':219 'token':126 'unit':85 'unknown':243 'unverifi':187 'usd':94 'usdc':14,28,64,87 'usdc-settlement' 'use':63 'util':132 'valid':134 'via':68 'wall':41 'wallet':170 'well':199 'well-form':198 'x402':2,16,39,70,189 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ab21da12-f97f-44d0-9cf9-bb7b10549b59","listingId":"f1daee59-e2d5-4ceb-8a76-8fffa105d93b","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:43.871Z"}],"sources":[{"listingId":"f1daee59-e2d5-4ceb-8a76-8fffa105d93b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:43.871Z","lastSeenAt":"2026-04-25T11:32:47.072Z"}],"details":{"listingId":"f1daee59-e2d5-4ceb-8a76-8fffa105d93b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/145 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/145"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/145"},{"claim":"Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/145"}],"useCases":["Retrieving or processing a specific Stripe invoice via a crypto-paid API call","Programmatic invoice access without traditional API key provisioning","Agent-driven payment flows where USDC on Base settles per-request costs"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents that can settle x402 payments autonomously on Base","Projects already holding USDC on Base looking for low-friction API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume batch invoice processing where $0.02/call adds up significantly","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.746Z"},"updatedAt":"2026-04-25T11:32:47.072Z"}}