{"id":"2c2d6128-24bb-4a47-a065-c55a78c73be3","shortId":"wyu92K","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a variety of endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are pay-per-request using the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/item/31` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The endpoint accepts POST requests and returns application/json. However, the exact functionality behind this particular item ID is not documented — the site's landing page lists many named endpoints (metrics, reports, sentiment analysis, summarization, etc.) but `/api/v1/item/31` does not map clearly to any of them.\n\nThe broader platform advertises endpoints priced at $0.02 per request, though the 402 challenge for this specific endpoint shows a maxAmountRequired of 20,000 (in the asset's smallest unit). Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","http-post"],"categories":["api-platform","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["The exact purpose of /api/v1/item/31 is unknown — it does not correspond to any named endpoint on the landing page.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive documentation.","maxAmountRequired is 20000 in USDC smallest units; actual dollar cost depends on USDC decimals (likely $0.02 if 6 decimals).","No OpenAPI spec, no request/response schema, and no usage examples are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/31","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/item/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but the specific functionality of /api/v1/item/31 is undocumented. All documentation pages returned only 'Connect wallet' with no content. No request/response schemas, no examples, and no clear description of what this item endpoint actually 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'/docs':195 '/pricing':196 '/readme':197 '/request':17,34 '0.02':16,33,170 '000':111,186 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':110,185 '402':105,175 'Base network API' 'USDC API' 'accept':77,120 'access':101 'across':49 'advertis':166 'ai':10,27,54 'analysi':150 'analyt':53 'api':4,21,41,82,100 'application/json':125 'asset':189 'base':7,24,75,117 'behind':130 'broader':164 'categori':51 'challeng':106,176 'clear':158 'commit':89 'connect':201 'content':207 'data':9,26,52 'descript':213 'detail':209 'document':137,193 'enabl':40 'endpoint':14,31,48,63,93,119,146,167,180 'etc':152 'exact':128 'exampl':216 'expos':44 'financ':11,28,57 'four':50 'function':129 'howev':126 'http-post' 'id':134 'infrastructur':60 'item':133 'json-response' 'key':83 'land':141 'learn':56 'limit':86 'list':97,143 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':55 'mani':144 'map':157 'maxamountrequir':183 'metric':147 'micropayment API' 'name':145 'network':76 'no-api-key' 'offer':8,25 'page':142,194 'paramet':212 'particular':132 'pay':66 'pay-per-call API' 'pay-per-request':65 'payabl':3,20 'payment':79 'per':67,171 'platform':5,22,42,165 'post':121 'premium':99 'price':168 'prompt':203 'protocol':72 'rate':85 'report':148 'request':68,107,122,172 'request/response':210 'requir':90 'return':103,124,198 'schema':211 'sentiment':149 'show':181 'site':139 'smallest':191 'specif':92,179 'substant':206 'summar':151 'though':173 'unavail':218 'unit':112,192 'usag':215 'usdc':78,114 'usdc-base' 'use':69 'util':13,30,61 'varieti':46 'wallet':202 'web3':58 'x402':2,19,39,71 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"c85ae1d2-ed95-440d-8f4e-018a7dd0deb7","listingId":"2c2d6128-24bb-4a47-a065-c55a78c73be3","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/item/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:55.421Z"}],"sources":[{"listingId":"2c2d6128-24bb-4a47-a065-c55a78c73be3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:55.421Z","lastSeenAt":"2026-04-23T20:01:19.802Z"}],"details":{"listingId":"2c2d6128-24bb-4a47-a065-c55a78c73be3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/31 \\\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 landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network payments.","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/item/31 requests USDC on Base with maxAmountRequired of 20000 and a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/item/31"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without traditional API key registration","Making pay-per-request calls from autonomous agents via x402","Integrating low-friction paid endpoints into workflows on the Base network"],"bestFor":["Agents or developers wanting keyless, pay-per-use API access","x402-compatible clients on the Base network","Quick one-off API calls without subscription commitments"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may be expensive","Anyone requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:21:00.899Z"},"updatedAt":"2026-04-23T20:01:19.802Z"}}