{"id":"e266117f-0687-4369-9e03-34cf4f5db5cb","shortId":"3FTsX2","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 marketplace 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 priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/173` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USDC, i.e., $0.02). Payment is made via the `exact` scheme to the specified wallet address. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation 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 usage examples available. The actual functionality behind the \"Premium API Access\" label for resource 173 is unclear; it could map to any of the listed service categories. Without documentation, callers must experiment to discover the expected input format and output structure.","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":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","crypto paid api","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of resource/173 ('Premium API Access') is undocumented and unclear","No request body schema or response schema is available; callers must guess input format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/173","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/generate/resource/173","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 x402 402 challenge, confirming it is operational. However, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what 'Premium API Access' resource 173 actually does. The listing is effectively a stub with confirmed liveness and 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'/api/v1/generate/resource/173':118 '/docs':172 '/pricing':173 '/readme':176 '/request':17,34 '0.02':16,33,90,141,144 '000':136 '173':214 '20':135 'accept':159 'access':124,210 'across':49 'actual':204 'address':156 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,105,123,209 'application/json':165 'avail':202 'base':7,24,98,137 'base network api' 'behind':206 'caller':229 'categori':51,226 'challeng':130 'classif':66 'classification' 'commit':113 'connect':182 'content':188 'convers':83 'could':218 'crypto paid api' 'data':9,26,52,56 'data-analytics' 'discov':233 'document':167,197,228 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,116,158 'estim':77 'exact':150 'exampl':201 'exchang':72 'expect':235 'experi':231 'export':57 'expos':44 'extrem':169 'feed':71 'financ':11,28,68 'finance-data' 'format':237 'four':50 'function':205 'gas':76 'generat':84 'geocod':81 'geocoding' 'http':160 'i.e':143 'infrastructur':79 'input':236 'insight':58 'key':106 'label':211 'learn':61 'limit':109 'list':120,224 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':60 'made':147 'map':219 'marketplac':42 'maxamountrequir':133 'metric':54 'micropayment api' 'must':230 'network':99 'offer':8,25 'openapi':192 'output':239 'page':177 'pay per call api' 'pay-per-request' 'payabl':3,20,93 'payment':145 'per':91 'platform':5,22 'post':161 'premium':122,208 'price':70,88 'prompt':184 'protocol':103 'quot':75 'rate':73,108 'render':179 'report':55 'request':92,162 'request/response':195 'resourc':213 'respons':166 'return':126,164 'schema':196 'scheme':151 'sentiment':62 'sentiment-analysis' 'servic':225 'spars':170 'spec':193 'specif':115 'specifi':154 'standard':128 'structur':240 'summar':65 'text':64 'text-summarization' 'token':74 'unclear':216 'unit':138 'upfront':112 'usag':200 'usdc':95,140,142 'usdc api' 'usdc-base' 'util':13,30,80 'utility-apis' 'valid':82 'varieti':46 'via':100,148 'wallet':155,183 'web3':69 'without':227 'x402':2,19,39,102,129 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"fc120c93-5910-432f-a14d-ffbfb9026dcd","listingId":"e266117f-0687-4369-9e03-34cf4f5db5cb","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/generate/resource/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:14.912Z"}],"sources":[{"listingId":"e266117f-0687-4369-9e03-34cf4f5db5cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:14.912Z","lastSeenAt":"2026-04-23T16:06:40.067Z"}],"details":{"listingId":"e266117f-0687-4369-9e03-34cf4f5db5cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/173 \\\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":"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 resource/173 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/173"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-request payment basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty usage patterns where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users who need detailed API documentation or request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.503Z"},"updatedAt":"2026-04-23T16:06:40.067Z"}}