{"id":"2c13a7b8-15f4-43c6-ae95-09dc24ab6695","shortId":"HE4Y4Y","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 broad catalog 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 `/api/v1/trades/122` is listed as \"Premium API Access\" and was confirmed live via a 402 challenge. It accepts POST requests and charges 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. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The specific purpose of the `/api/v1/trades/122` endpoint (what trade data it returns or what it does) is not documented beyond the generic \"Premium API Access\" label. Prospective users should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key","data-analytics","ai-inference","finance-data","web3","utility-services"],"categories":["data","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API","serverless API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all return only a wallet-connect prompt with no content.","No OpenAPI or schema definition found for any endpoint.","The specific function of /api/v1/trades/122 ('Premium API Access') is not explained anywhere in available materials.","Request body format and response structure are completely unknown.","The platform lists many endpoint categories but none appear individually documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/122","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/trades/122 is undocumented. This is effectively a stub 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'/api/v1/trades/122':118,219 '/docs':183 '/pricing':184 '/readme':187 '/request':17,34 '0.02':16,33,91,153 '000':142 '0x8335':147 '20':141 '2913':148 '300':169 '402':131 '6':157 'Base network API' 'USDC API' 'accept':134 'access':124,238 'across':50 'actual':249 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,106,123,237 'application/json':177 'avail':213 'awar':244 'base':7,24,99,143,150 'behavior':250 'beyond':233 'broad':46 'catalog':47 'categori':52 'challeng':132 'charg':138 'classif':67 'commit':114 'confirm':127 'connect':193 'content':199 'convers':84 'crypto-paid API' 'data':9,26,53,57,223 'data-analytics' 'decim':158 'document':178,208,232,247 'embed':68 'enabl':40 'endpoint':14,31,49,87,117,220,253 'equal':152 'estim':78 'exact':165 'exampl':212 'exchang':73 'export':58 'expos':44 'extrem':180 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'gas':77 'generat':85 'generic':235 'geocod':82 'given':154 'infrastructur':80 'insight':59 'json-response' 'key':107 'label':239 'learn':62 'limit':110 'list':120 'live':128 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':61 'made':161 'metric':55 'micropayment API' 'mime':174 'network':100 'no-api-key' 'offer':8,25 'openapi':203 'page':188 'pay-per-call API' 'pay-per-request' 'payabl':3,20,94 'payment':159 'per':92 'platform':5,22,42 'post':135 'post-method' 'premium':122,236 'price':71,89 'prompt':195 'prospect':240 'protocol':104 'purpos':216 'quot':76 'rate':74,109 'report':56 'request':93,136 'request/response':206 'respons':173 'return':190,225 'schema':207 'scheme':166 'second':170 'sentiment':63 'serverless API' 'spars':181 'spec':204 'specif':116,215 'substant':198 'summar':66 'text':65 'timeout':171 'token':75 'trade':222 'type':175 'unit':144 'unknown':255 'upfront':113 'usag':211 'usdc':96,146,155 'usdc-base' 'user':241 'util':13,30,81 'utility-services' 'valid':83 'via':101,129,162 'wallet':194 'web3':70 'without':246 'x402':2,19,39,103,164 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"feedd7fb-c46a-46f6-a29e-4585a7273477","listingId":"2c13a7b8-15f4-43c6-ae95-09dc24ab6695","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:30.356Z"}],"sources":[{"listingId":"2c13a7b8-15f4-43c6-ae95-09dc24ab6695","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/122","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:30.356Z","lastSeenAt":"2026-04-23T00:32:17.066Z"}],"details":{"listingId":"2c13a7b8-15f4-43c6-ae95-09dc24ab6695","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/122 \\\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 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":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge confirms maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/122"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/trades/122"}],"useCases":["Accessing trade or market data on a per-request payment basis without API key registration","Integrating low-cost AI inference (sentiment, summarization, classification, embeddings) into agent workflows","Fetching real-time crypto gas estimates or token quotes with instant x402 payment"],"bestFor":["AI agents that need keyless, pay-per-call API access on Base","Developers prototyping with low-cost data and AI endpoints","Web3-native applications that prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto payment overhead is impractical","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.703Z"},"updatedAt":"2026-04-23T00:32:17.066Z"}}