{"id":"84ad691d-39a9-4214-b482-5f4ca7560d35","shortId":"3zN2qh","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 broad catalog of 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 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/trades/134` is listed under \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint name \"trades/134\" suggests it may return trade-related data (possibly a specific trade record), but the exact request format and response structure are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","finance-data","web3-data","geocoding","utility-apis"],"categories":["finance","llm","geo","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","trades API","premium API access"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/trades/134 is undocumented","The endpoint path 'trades/134' with a numeric ID suggests a specific resource, but it's unclear what trade data it returns or what POST body it expects"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/134","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/trades/134","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, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of '/api/v1/trades/134' is unclear beyond the generic 'Premium API Access' 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'/api/v1/trades/134':109 '/docs':181 '/pricing':183 '/readme':185 '/request':17,34 '0.02':16,33,93,136 '000':125 '0x8335':130 '20':124 '2913':131 '300':152 '402':119 '6':140 'Base network API' 'USDC API' 'access':115,163 'across':50 'addit':196 'advertis':162 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,114,156 'avail':212 'base':7,24,100,126,133 'base-network' 'broad':46 'call':91 'catalog':47 'categori':52 'challeng':120 'classif':66 'connect':191 'content':198 'convers':83 'crawl':215 'data':9,26,53,228 'data-analytics' 'decim':141 'document':176,207 'embed':67 'enabl':40 'endpoint':14,31,49,86,108,218 'equal':135 'estim':77 'exact':148,236 'exampl':211 'exchang':72 'export':57 'expos':44 'extrem':178 'feed':71 'financ':11,28,68 'finance-data' 'format':238 'four':51 'gas':76 'gate':3,20 'generat':84 'geocod':81 'geocoding' 'given':137 'header':175 'includ':169 'infrastructur':79 'insight':58 'instant':165 'key':157 'learn':61 'limit':160 'list':111 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':144 'materi':216 'may':223 'metric':55 'micropayment API' 'name':219 'network':101 'offer':8,25 'openapi':202 'page':186 'pay':89 'pay-per-cal':88 'pay-per-call API' 'pay-per-request' 'payment':142,167,174 'per':90 'platform':5,22,42 'possibl':229 'premium':113 'premium API access' 'price':70 'prompt':193 'protocol':105 'quot':75 'rate':73,159 'record':233 'relat':227 'render':188 'report':56 'request':121,237 'request/response':205 'respons':240 'return':117,224 'schema':206 'scheme':149 'second':153 'sentiment':62 'settl':95 'spars':179 'spec':203 'specif':107,231 'structur':241 'suggest':221 'summar':65 'technic':197 'text':64 'timeout':154 'token':74 'trade':226,232 'trade-rel':225 'trades API' 'trades/134':220 'unit':127 'unknown':243 'usag':210 'usdc':97,129,138 'usdc-settlement' 'util':13,30,80 'utility-apis' 'valid':82 'via':102,145 'wallet':192 'web3':69 'web3-data' 'x':173 'x-payment':172 'x402':2,19,39,104,147 'x402 API' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"145cd712-71e6-46c9-94f8-c415fa327b16","listingId":"84ad691d-39a9-4214-b482-5f4ca7560d35","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/trades/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:37.698Z"}],"sources":[{"listingId":"84ad691d-39a9-4214-b482-5f4ca7560d35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:37.698Z","lastSeenAt":"2026-04-22T23:02:05.150Z"}],"details":{"listingId":"84ad691d-39a9-4214-b482-5f4ca7560d35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/134 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/134"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data on-demand without API key registration","Integrating pay-per-call data endpoints into autonomous agents","Accessing AI inference (sentiment, summarization, classification) with per-request USDC payments","Querying crypto gas estimates or token quotes via micropayments"],"bestFor":["AI agents needing keyless, pay-per-call API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume use cases where $0.02/request adds up significantly versus subscription pricing","Users who need detailed API documentation or SDKs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.298Z"},"updatedAt":"2026-04-22T23:02:05.150Z"}}