{"id":"d5376d80-5917-4f13-9cb2-3362e5ca7961","shortId":"CXvR9U","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint listed here (`/api/v1/stripe/invoices/123`) is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform groups its APIs into four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nDocumentation beyond the landing page is effectively empty — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The specific behavior of the `/api/v1/stripe/invoices/123` endpoint (what it returns, what input it expects) is not documented anywhere in the crawled material. The endpoint path suggests Stripe invoice data, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["finance","data","infrastructure"],"synonyms":["x402 API","micropayment API","USDC API","pay-per-call","Base network API","Stripe invoice API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet connect prompt","No OpenAPI or schema definition found for any endpoint","The specific endpoint path '/api/v1/stripe/invoices/123' includes a hardcoded ID (123) which may be a demo or placeholder rather than a real resource","No request body schema or response schema is documented anywhere","The platform lists many endpoint categories but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/123","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs. The purpose of this specific endpoint (stripe/invoices/123) is unclear and undocumented. Pricing is clear 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'/api/v1/stripe/invoices/123':64,212 '/docs':176 '/pricing':178 '/readme':180 '/request':164 '0.02':85,163 '000':79 '20':78 '402':73 'Base network API' 'Stripe invoice API' 'USDC API' 'access':69,99 'advertis':90 'ai':12,28,130 'analysi':134 'analyt':11,27,124 'anywher':224 'api':5,21,39,68,92,119 'attach':102 'avail':206 'base':8,24,57,80 'behavior':209 'beyond':168 'broad':44 'broader':115 'call':4,20,87 'caller':100 'catalog':45 'categori':122 'challeng':74 'classif':137 'connect':186 'content':192 'convers':154 'cover':10,26 'crawl':227 'data':123,127,235 'document':167,201,223 'effect':173 'embed':138 'empti':174 'enabl':38 'endpoint':16,32,51,61,157,213,230 'estim':148 'exampl':205 'exchang':143 'expect':220 'export':128 'feed':142 'financ':13,29,139 'four':121 'gas':147 'generat':155 'geocod':152 'group':117 'header':107 'http-post' 'i.e':84 'infrastructur':150 'input':218 'insight':129 'instant':98 'invoic':234 'json-response' 'key':93 'label':66 'land':170 'learn':132 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'x402-payment'","prices":[{"id":"670ac5fe-4e4f-4c6c-9f84-a11135740977","listingId":"d5376d80-5917-4f13-9cb2-3362e5ca7961","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:33.671Z"}],"sources":[{"listingId":"d5376d80-5917-4f13-9cb2-3362e5ca7961","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:33.671Z","lastSeenAt":"2026-04-25T14:32:46.790Z"}],"details":{"listingId":"d5376d80-5917-4f13-9cb2-3362e5ca7961","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/123"},{"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":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/123"}],"useCases":["Accessing Stripe invoice data via a single paid API call","Programmatic pay-per-use API consumption without subscription or API key management","Agent-driven workflows that need on-demand data retrieval with crypto payment"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who want to avoid monthly subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and documented schemas","Users who need detailed API documentation or client SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.171Z"},"updatedAt":"2026-04-25T14:32:46.790Z"}}