{"id":"c62ee962-3685-493e-850d-970b936778f9","shortId":"FNZJgX","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/22` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site-wide pricing displayed on the landing page. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe provider's landing page lists 16 endpoints across 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 (geocoding, validation, conversion, generation). Documentation pages beyond the landing page returned only a \"Connect wallet\" stub, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable. The `/api/v1/collections/22` path does not map obviously to any of the individually listed endpoints, so it may be a bundle or aggregate access point — this is unclear from available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-gateway","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","no-auth API","crypto pay API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content.","The endpoint path /api/v1/collections/22 does not match any of the 16 individually listed endpoints — its exact function is unclear.","No OpenAPI spec, no request/response schema, and no example payloads are available.","No SLA, rate-limit, or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, documentation pages are empty stubs ('Connect wallet'), there is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/collections/22 is ambiguous. This is effectively a stub listing with confirmed liveness but very sparse 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'0.02':9,25,133 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x8335':122 '16':165 '20':115 '2913':123 '300':156 '6':129 'Base network API' 'USDC API' 'accept':105 'access':103,246 'account':89 'across':167 'address':152 'advertis':111 'aggreg':245 'ai':176 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':180 'analyt':48,171 'api':4,20,45,86,102 'attach':66 'avail':252 'base':7,23,72,117,125 'beyond':203 'bundl':243 'call':44 'caller':65 'categori':169 'challeng':64,110 'classif':183 'collect':5,21 'connect':210 'consist':136 'contract':121 'convers':199 'conversion' 'crypto pay API' 'crypto-gas' 'data':47,52,170 'data-analytics' 'decim':130 'descript':218 'detail':214 'display':143 'document':201 'embed':184 'endpoint':57,95,166,237 'equal':132 'estim':194 'everi':56 'exampl':220 'exchang':189 'exchange-rates' 'export':174 'feed':188 'financ':185 'finance-prices' 'finance/web3':51 'four':168 'gas':193 'gate':3,19,59 'generat':200 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'usdc':13,29,68,120,127 'usdc-base' 'use':128 'util':54 'valid':198 'validation' 'wallet':211 'web3':186 'wide':141 'x':77 'x-payment':76 'x402':2,18,39,62,109 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"c8e1f03f-9cec-4379-97e9-4468042a1662","listingId":"c62ee962-3685-493e-850d-970b936778f9","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T23:59:55.388Z"}],"sources":[{"listingId":"c62ee962-3685-493e-850d-970b936778f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T23:59:55.388Z","lastSeenAt":"2026-04-22T02:31:45.700Z"}],"details":{"listingId":"c62ee962-3685-493e-850d-970b936778f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/22 \\\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":"The site lists 16 endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/22"},{"claim":"Site advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"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 micropayments","Geocoding or data validation utilities accessible to autonomous agents via x402 payment headers","Exporting analytics data or generating reports without subscription commitments"],"bestFor":["AI agents and bots that can sign x402 USDC payments on Base","Developers wanting zero-signup, pay-as-you-go access to common utility APIs","Low-volume or sporadic callers who don't want monthly subscriptions"],"notFor":["High-volume production workloads needing bulk pricing or SLAs","Users without a Base-network USDC wallet or x402-compatible client","Anyone requiring detailed API documentation or guaranteed uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.044Z"},"updatedAt":"2026-04-22T02:31:45.700Z"}}