{"id":"d01d757b-7d5a-4a25-a578-7e7352cf78b2","shortId":"6hEYhA","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints 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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach an X-PAYMENT header to each request and the server processes it before returning results.\n\nThe specific endpoint listed here (`/api/v1/orders/69`) is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The purpose of the `/api/v1/orders/69` path specifically is unclear — it may be a demo or placeholder order endpoint rather than a general-purpose API.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC micropayment API","Base network API","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The specific endpoint /api/v1/orders/69 has an unclear purpose — 'Premium API Access' is vague","Cannot verify what data or functionality any endpoint actually returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/69","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/69","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), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/orders/69 is ambiguous. Docs pages all return only 'Connect wallet' with no 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'/api/v1/orders/69':118,241 '/call':19,38 '/docs':202 '/pricing':203 '/readme':206 '/request':164 '0.02':18,37,68,149,163 '000':138 '0x8335':143 '20':137 '2913':144 '6':153 'Base network API' 'USDC micropayment API' 'accept':126 'access':124 'advertis':132 'ai':12,31 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':57 'also':168 'amount':135 'analysi':173 'analyt':56 'api':5,24,45,80,123,261 'attach':96 'avail':233 'base':8,27,76,139,146 'broad':50 'caller':95 'challeng':131 'classif':176 'collect':51 'commit':88 'connect':212 'consist':157 'convers':188 'conversion' 'cost':67 'crawl':236 'crypto-gas-estimates' 'crypto-paid API' 'data':11,30,55,60 'data-analytics' 'decim':154 'demo':250 'describ':120 'detail':219 'document':197,228 'embed':177 'enabl':44 'endpoint':16,35,53,66,115,170,254 'equal':148 'estim':185 'everi':65 'exampl':232 'exchang':180 'exchange-rates' 'expos':169 'extrem':199 'feed':179 'financ':13,32 'finance-price-feeds' 'finance/web3':59 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'util':15,34,63 'valid':187 'validation' 'via':9,28 'wallet':213 'wide':162 'x':99 'x-payment':98 'x402':10,29,43,90,130 'x402 API marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f891c0ad-a0aa-4a99-aeb2-89fd79db6fa9","listingId":"d01d757b-7d5a-4a25-a578-7e7352cf78b2","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:44.511Z"}],"sources":[{"listingId":"d01d757b-7d5a-4a25-a578-7e7352cf78b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:44.511Z","lastSeenAt":"2026-04-22T21:30:30.537Z"}],"details":{"listingId":"d01d757b-7d5a-4a25-a578-7e7352cf78b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/69 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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/69"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates with per-call USDC payment","Running geocoding, validation, or data conversion tasks on a pay-as-you-go basis","Integrating x402-compatible agents with a low-cost utility API suite"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle payments via x402 on Base","Projects needing lightweight, low-cost utility and data endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads requiring SLAs or guaranteed uptime","Users without USDC on Base or an x402-compatible payment flow"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.022Z"},"updatedAt":"2026-04-22T21:30:30.537Z"}}