{"id":"c7c0ae91-bd6c-4f39-8d30-da7f2f20c2cf","shortId":"kg3Y97","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is gated by the x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint at `/api/v1/collections/38` is listed as \"Premium API Access.\" The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. The broader site offers roughly 16 endpoints organized into four categories: Data & Analytics (metrics, reports, 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 are priced at $0.02 per call.\n\nDocumentation is extremely sparse — 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 endpoint accepts POST requests and returns application/json, but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-base","no-api-key","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation"],"categories":["api-gateway","ai","finance","data"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are entirely unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/collections/38 is unclear; it may be a bundle or a single endpoint","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/38","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/collections/38","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 /docs and related pages are empty. The purpose of '/collections/38' specifically is unclear beyond the generic label 'Premium API 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'/api/v1/collections/38':97 '/docs':184 '/pricing':185 '/readme':188 '0.02':9,25,126,176 '000':112 '0x8335':118 '16':134 '20':111 '2913':119 '6':122 'Base network API' 'USDC micropayment API' 'accept':220 'access':103 'account':89 'advertis':107 'ai':146 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':150 'analyt':48,141 'api':4,20,45,86,102 'application/json':225 'asset':117 'attach':66 'avail':214 'base':7,23,72,113,121 'bodi':230 'broader':130 'call':44,178 'caller':65 'categori':139 'challeng':64,106 'classif':153 'collect':5,21 'connect':194 'content':200 'convers':170 'crawl':217 'crypto-gas' 'crypto-paid API' 'data':47,52,140 'data-analytics' 'decim':123 'document':179,209 'embed':154 'endpoint':57,95,135,219 'equal':125 'estim':164 'everi':56 'exact':228 'exampl':213 'exchang':159 'exchange-rates' 'export':144 'extrem':181 'feed':158 'financ':155 'finance-prices' 'finance/web3':51 'format':231 'four':138 'gas':163 'gate':3,19,59 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'x-payment':76 'x402':2,18,39,62,105 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"410580d7-6f98-4253-be16-5770361acc5e","listingId":"c7c0ae91-bd6c-4f39-8d30-da7f2f20c2cf","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/collections/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:51.748Z"}],"sources":[{"listingId":"c7c0ae91-bd6c-4f39-8d30-da7f2f20c2cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:51.748Z","lastSeenAt":"2026-04-22T02:31:46.225Z"}],"details":{"listingId":"c7c0ae91-bd6c-4f39-8d30-da7f2f20c2cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/38"},{"claim":"The site lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto gas estimates or token price quotes with per-call USDC payment","Running data analytics or export jobs paid per request via x402 protocol","Geocoding or data validation as a utility microservice with no subscription commitment"],"bestFor":["AI agents with Base-network USDC wallets needing frictionless API access","Developers prototyping against multiple API categories without signup","Low-volume or bursty workloads where pay-per-call is cheaper than a subscription"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.441Z"},"updatedAt":"2026-04-22T02:31:46.225Z"}}