{"id":"60bf997c-befa-4df4-a479-99d4a64c68af","shortId":"DrFh7u","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad suite of 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, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/keys/4` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the \"Premium API Access\" label at this specific path is unclear; it may be an API key provisioning endpoint or a meta-access endpoint, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","cheap API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/keys/4 ('Premium API Access') is unclear — it may be a key provisioning endpoint rather than a data endpoint","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request body schema or response examples are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/4","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/keys/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, and the landing page describes the platform's offerings and pricing. However, there is no OpenAPI spec, no request/response schema, no documentation for what this specific endpoint returns, and no usage examples. The actual functionality of '/api/v1/keys/4' labeled 'Premium API Access' is 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'/api/v1/keys/4':112 '/pricing':179 '/readme':181 '/request':19,38 '0.02':18,37,95,133 '000':128 '20':127 '402':122 '6':138 'Base network API' 'USDC API' 'accept':164 'access':118,216,236 'across':54 'actual':210 'addit':193 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,152,215,228 'application/json':169 'avail':208,244 'base':8,27,103,129,141 'behind':212 'beyond':171 'broad':50 'call':4,23 'cannot':240 'categori':56 'challeng':123 'cheap API access' 'classif':71 'classification' 'commit':160 'confirm':242 'connect':189 'content':194 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':139 'document':170,203 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,163,231,237 'estim':82 'exact':148 'exampl':207 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':211 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':153,229 'label':217 'land':173 'learn':66 'limit':156 'list':114 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'x402-payment'","prices":[{"id":"dba14b17-c94e-495d-891d-ca71d84d95b2","listingId":"60bf997c-befa-4df4-a479-99d4a64c68af","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/keys/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.356Z"}],"sources":[{"listingId":"60bf997c-befa-4df4-a479-99d4a64c68af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.356Z","lastSeenAt":"2026-04-22T01:02:18.642Z"}],"details":{"listingId":"60bf997c-befa-4df4-a479-99d4a64c68af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/4 \\\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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/keys/4 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/keys/4"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Geocoding, data validation, and format conversion as utility microservices","Exporting analytics data and generating insights reports on a per-request basis"],"bestFor":["AI agents that need low-friction, keyless API access via crypto micropayments","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.902Z"},"updatedAt":"2026-04-22T01:02:18.642Z"}}