{"id":"0f16ccc0-f650-4ec9-bee9-85a26b3d1034","shortId":"8wHKDs","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated 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 (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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/claims/93` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page 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 example payloads available. It is unclear what specific data or functionality the `/api/v1/claims/93` endpoint returns, as the description is generic (\"Premium API Access\") and does not match any of the named API categories on the homepage. Without documentation or examples, agents will need to experiment to determine the expected input and output formats.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment required"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no useful content","The specific endpoint /api/v1/claims/93 ('Premium API Access') does not correspond to any named API on the homepage — its actual functionality is unknown","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/93","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/claims/93","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation, no request/response examples, and the specific purpose of /api/v1/claims/93 is unclear. The docs, pricing, and README pages are all empty beyond a wallet connect 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'/api/v1/claims/93':109,214 '/docs':174 '/pricing':175 '/readme':178 '/request':17,34 '0.02':16,33,93,136 '000':125 '0x8335':130 '20':124 '2913':131 '402':119 '402 payment required' '6':134 'accept':159 'access':115,224 'across':49 'agent':242 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,114,147,223,233 'application/json':164 'avail':204 'base':7,24,100,126,133 'base network api' 'base-network' 'beyond':166 'call':91 'categori':51,234 'challeng':120 'classif':66 'classification' 'commit':155 'connect':184 'content':190 'convers':83 'data':9,26,52,56,210 'data-analytics' 'decim':135 'descript':219 'determin':248 'document':165,199,239 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,108,158,215 'estim':77 'exact':143 'exampl':202,241 'exchang':72 'expect':250 'experi':246 'export':57 'expos':44 'extrem':171 'feed':71 'financ':11,28,68 'finance-data' 'format':254 'four':50 'function':212 'gas':76 'gate':3,20 'generat':84 'generic':221 'geocod':81 'geocoding' 'homepag':237 'http':160 'infrastructur':79 'input':251 'insight':58 'key':148 'land':168 'learn':61 'limit':151 'list':111 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':139 'match':228 'metric':54 'micropayment api' 'name':232 'need':244 'network':101 'no-api-key' 'offer':8,25 'openapi':194 'output':253 'page':169,179 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payload':203 'payment':137 'per':90 'platform':5,22,42 'post':161 'premium':113,222 'price':70 'prompt':186 'protocol':105 'quot':75 'rate':73,150 'render':181 'report':55 'request':121 'request/response':197 'requir':156 'return':117,163,216 'schema':198 'scheme':144 'sentiment':62 'sentiment-analysis' 'settl':95 'spars':172 'spec':195 'specif':107,209 'summar':65 'text':64 'text-summarization' 'token':74 'unclear':207 'unit':127 'upfront':154 'usdc':97,129 'usdc api' 'usdc-settlement' 'util':13,30,80 'valid':82 'varieti':46 'via':102,140 'wallet':185 'web3':69 'without':238 'x402':2,19,39,104,142 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"23947f60-be30-4584-ae8d-2e4326276b78","listingId":"0f16ccc0-f650-4ec9-bee9-85a26b3d1034","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/claims/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:56.752Z"}],"sources":[{"listingId":"0f16ccc0-f650-4ec9-bee9-85a26b3d1034","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:56.752Z","lastSeenAt":"2026-04-23T06:31:03.879Z"}],"details":{"listingId":"0f16ccc0-f650-4ec9-bee9-85a26b3d1034","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/93 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/claims/93 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/93"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on demand","Running utility tasks like geocoding, validation, or data conversion with micropayments"],"bestFor":["Agents that need diverse API access without subscription commitments","Developers wanting to prototype with pay-per-use endpoints on Base","Crypto-native applications that can settle in USDC on Base"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Use cases needing high-volume batch processing where per-request pricing is inefficient","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.056Z"},"updatedAt":"2026-04-23T06:31:03.879Z"}}