{"id":"e5e7f957-099d-4753-9cee-f519a6148a61","shortId":"p5xmvx","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/orders/24` is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/orders/24` endpoint specifically is unclear — it may be a generic order-retrieval or order-creation endpoint, but this is not documented. The broader site lists 16 endpoints but provides no schema details for any of them.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","micropayment API","USDC API","Base network API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and expected request body for /api/v1/orders/24 is undocumented","No example requests or responses are available anywhere in the crawled material","The breadth of claimed capabilities (16 endpoints across 4 categories) cannot be verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/24","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/24","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/orders/24 is undocumented. Effectively a stub 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'/api/v1/orders/24':113,216 '/call':12,31 '/docs':181 '/pricing':182 '/readme':185 '0.02':11,30,99,143 '000':132 '0x8335':137 '16':243 '20':131 '2913':138 '6':147 'Base network API' 'USDC API' 'accept':121 'access':119 'across':58 'addit':196 'advertis':127 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,159 'attach':167 'avail':211 'base':8,27,107,133,140 'base-network' 'broad':50 'broader':240 'caller':165 'catalog':51 'categori':60 'challeng':126 'classif':75 'classification' 'connect':191 'content':197 'convers':92 'creation':232 'crypto payment API' 'data':14,33,61,65 'data-analytics' 'decim':148 'describ':115 'detail':249 'document':176,206,238 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,217,233,244 'equal':142 'estim':86 'exact':155 'exampl':210 'exchang':81 'export':66 'extrem':178 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'gas':85 'generat':93 'generic':225 'geocod':90 'geocoding' 'given':144 'header':172 'infrastructur':88 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'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"238e7d33-5f19-4116-85f2-211dccc31bb2","listingId":"e5e7f957-099d-4753-9cee-f519a6148a61","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:04.265Z"}],"sources":[{"listingId":"e5e7f957-099d-4753-9cee-f519a6148a61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:04.265Z","lastSeenAt":"2026-04-23T00:31:04.756Z"}],"details":{"listingId":"e5e7f957-099d-4753-9cee-f519a6148a61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/24 \\\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":"All endpoints priced at $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","source_url":"https://lowpaymentfee.com/api/v1/orders/24"},{"claim":"16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle payments in USDC on Base per request","Low-volume or sporadic API consumers who prefer pay-as-you-go over subscriptions"],"notFor":["High-volume users who need bulk pricing or subscription discounts","Developers who need detailed API documentation, schemas, or SDKs before integrating","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.909Z"},"updatedAt":"2026-04-23T00:31:04.756Z"}}