{"id":"4d35205b-d3ab-47f8-b1c5-93ae9e32ff5f","shortId":"nSA8U9","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 access to a Stripe invoice resource (invoice ID 98) behind an x402 payment wall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments — just an x402 payment header on each call.\n\nThis specific endpoint (/api/v1/stripe/invoices/98) is labeled \"Premium API Access\" and appears to be a Stripe invoice-related resource. The probe confirmed it is live, returning a proper 402 challenge. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl.","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 paid API","USDC micropayment API","pay-per-request endpoint","lowpaymentfee","Base USDC API","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content.","The specific purpose of /api/v1/stripe/invoices/98 ('Premium API Access') is ambiguous — it is unclear what data it returns or what input it expects.","No examples or error handling documentation found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of this specific invoice endpoint is unclear. Effectively a stub 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'0.02':71,119 '000':75 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':65 '20':74 '402':168 '402 payment required' '6':79 '98':42 'Base USDC API' 'USDC micropayment API' 'accept':49 'access':34,148 'advertis':85 'ai/ml':97 'analysi':100 'analyt':96 'api':93,124,147,177 'appear':150 'avail':206 'base':8,22,60,76 'base-network' 'behind':43 'broader':82 'call':12,26,92,139 'challeng':169 'classif':102 'commit':131 'confirm':161 'connect':186 'contract':64 'convers':112 'cost':69 'crawl':209 'data':95,106 'decim':80 'detail':193 'doc':176 'document':171 'embed':103 'endpoint':6,20,30,115,142 'exampl':205 'extrem':173 'finance/crypto':104 'gate':3,17 'generat':113 'geocod':110 'header':136 'howev':170 'id':41 'infer':98 'invoic':5,19,38,40,156 'invoice-rel':155 'json':54 'json-response' 'key':125 'label':145 'limit':128 'list':117 'live':164 'lowpaymentfee' 'lowpaymentfee.com':32,83 'market':105 'maximum':68 'network':61 'no-api-key' 'openapi':197 'page':181 'pay':10,24,90 'pay-per-cal':9,23,89 'pay-per-call' 'pay-per-request endpoint' 'payment':46,55,135 'per':11,25,72,91,120 'platform':84 'post':50 'premium':146 'price':178 'probe':160 'prompt':188 'proper':167 'provid':33 'rate':127 'readm':180 'relat':157 'render':183 'request':51,73,121 'request/response':200 'resourc':39,158 'return':53,165 'schema':201 'sentiment':99 'servic':109 'settl':57 'span':94 'spars':174 'spec':198 'specif':141 'stripe':4,18,37,154 'stripe invoice API' 'stripe-invoices' 'suit':87 'summar':101 'technic':192 'unit':77 'usag':204 'usdc':14,28,63 'usdc-settlement' 'use':62 'util':108 'valid':111 'wall':47 'wallet':187 'x402':2,16,45,134 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a166a464-0e0a-485e-868a-a606f158ebf6","listingId":"4d35205b-d3ab-47f8-b1c5-93ae9e32ff5f","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:17.414Z"}],"sources":[{"listingId":"4d35205b-d3ab-47f8-b1c5-93ae9e32ff5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:17.414Z","lastSeenAt":"2026-04-25T04:03:27.070Z"}],"details":{"listingId":"4d35205b-d3ab-47f8-b1c5-93ae9e32ff5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/98 \\\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 a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/98"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/98"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data via a single paid API call","Programmatic access to invoice details without traditional API key management","Agent-driven invoice lookups settled with on-chain USDC micropayments"],"bestFor":["Agents or services that need on-demand Stripe invoice data without subscription overhead","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, pay-as-you-go invoice retrieval"],"notFor":["High-volume invoice processing where per-call fees add up","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.184Z"},"updatedAt":"2026-04-25T04:03:27.070Z"}}