{"id":"3ec1777a-34c4-4c25-9a2f-25ea8644d61d","shortId":"NXSVZd","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/crypto market data, and general utilities. 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/35` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. The site's landing page confirms a flat $0.02/request price across all endpoints.\n\nThe broader platform also offers 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 $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the exact request/response schemas for this collection endpoint are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","utility-apis","post-endpoint"],"categories":["api-gateway","data","llm","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No request or response schema available — the exact payload format for /api/v1/collections/35 is unknown.","Documentation pages (/docs, /pricing, /README, /api) returned no useful content beyond 'Connect wallet'.","The generic name 'Premium API Access' gives no indication of what data or functionality this specific endpoint provides.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/35","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/35","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). However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and the purpose of '/collections/35' specifically is opaque. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':143 '0.02':9,25,131,142,178 '000':118 '0x8335':123 '20':117 '2913':124 '6':127 'Base network API' 'USDC API' 'accept':106 'access':104 'account':90 'across':145 'advertis':112 'ai-inference' 'ai/ml':49 'also':151 'amount':115 'analysi':156 'analyt':48 'api':4,20,45,87,103 'attach':67 'base':7,23,73,119,126 'beyond':183 'broader':149 'call':44 'caller':66 'challeng':65,111 'classif':159 'collect':5,21,205 'confirm':139 'connect':190 'convers':171 'crypto-data' 'data':47,53 'data-analytics' 'decim':128 'detail':197 'document':181 'embed':160 'endpoint':58,96,147,153,206 'equal':130 'estim':168 'everi':57 'exact':200 'exchang':163 'feed':162 'finance-data' 'finance/crypto':51 'flat':141 'gas':167 'gate':3,19,60 'general':55 'generat':173 'geocod':169 'header':80 'host':34 'immedi':85 'infer':50 'key':15,31,88 'land':137,185 'limit':93 'list':100 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'market':52 'maximum':114 'micropayment API' 'network':74 'no-api-key' 'offer':152 'page':138,182,186 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':64,70,79 'per':10,26,43,132 'platform':150 'point':180 'post':107 'post-endpoint' 'premium':102 'price':144,161,179 'prompt':192 'protocol':40 'quot':166 'rate':92,164 'receiv':82 'request':11,27,108,133 'request/response':201 'requir':16,32 'respons':84 'return':187 'schema':202 'sentiment':155 'site':135 'span':46 'specif':95 'suit':36 'summar':158 'technic':196 'text':157 'token':165 'unit':120 'unknown':208 'usdc':13,29,69,122 'usdc-base' 'util':56 'utility-apis' 'valid':170 'wallet':191 'x':78 'x-payment':77 'x402':2,18,39,63,110 'x402 API marketplace' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"aee8d34e-e50c-403b-bda1-e0ad2a7ed344","listingId":"3ec1777a-34c4-4c25-9a2f-25ea8644d61d","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:51.153Z"}],"sources":[{"listingId":"3ec1777a-34c4-4c25-9a2f-25ea8644d61d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:51.153Z","lastSeenAt":"2026-04-22T04:02:21.074Z"}],"details":{"listingId":"3ec1777a-34c4-4c25-9a2f-25ea8644d61d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat $0.02 per request pricing across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/collections/35"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/35"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/crypto, and utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand data or AI inference without managing API keys or subscriptions","Programmatic access to analytics, sentiment analysis, or summarization with per-call crypto payment","Fetching real-time crypto gas estimates or token quotes via a single USDC micropayment","Geocoding or data conversion utilities paid per request on Base"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers who want pay-as-you-go pricing without signup or rate limits","Prototyping workflows that combine multiple API categories (AI, finance, utilities) under one payment scheme"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discount documented)","Users who need detailed API documentation or guaranteed SLAs (docs pages are empty)","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.549Z"},"updatedAt":"2026-04-22T04:02:21.074Z"}}