{"id":"1600bbe1-2c19-4b48-9885-2f9107880b10","shortId":"rYUENF","kind":"x402","title":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utilities at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utilities at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at a flat $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint probed here (`/api/v1/orders/1`) is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. All share the same $0.02 pricing.\n\nDocumentation is extremely thin — the docs, pricing, API, 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 from the crawl. The actual behavior and output of each endpoint cannot be verified from the available material, so treat the advertised capabilities with caution until independently confirmed.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","data-export","analytics-metrics"],"categories":["ai","finance","data","utilities"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available — request and response formats are unknown","The specific endpoint /api/v1/orders/1 is labeled 'Premium API Access' but its actual function is undocumented","Advertised capabilities (AI, analytics, finance, etc.) cannot be independently verified from crawl data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/1","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/orders/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The docs/pricing/API pages are all empty 'Connect wallet' stubs. The actual functionality behind each endpoint is 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'x402-payment'","prices":[{"id":"92dbc222-a9c3-4cbd-817e-ce9524a7e291","listingId":"1600bbe1-2c19-4b48-9885-2f9107880b10","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/orders/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:30.095Z"}],"sources":[{"listingId":"1600bbe1-2c19-4b48-9885-2f9107880b10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:30.095Z","lastSeenAt":"2026-04-23T00:31:10.044Z"}],"details":{"listingId":"1600bbe1-2c19-4b48-9885-2f9107880b10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/1"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API endpoints","Developers prototyping with multiple API categories without signing up for separate services","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.492Z"},"updatedAt":"2026-04-23T00:31:10.044Z"}}