{"id":"d3a8ea5d-229b-43a4-8bcb-76b74e5d7f0d","shortId":"ZkTNvL","kind":"x402","title":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints spanning data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific endpoint at `/api/v1/trades/1` is listed under \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled on the Base network in USDC (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nThe provider's landing page lists roughly 16 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this trades endpoint are unknown.\n\nBecause there is no OpenAPI spec, no example payloads, and no documentation beyond the landing page listing, the precise input parameters and response format for `/api/v1/trades/1` cannot be confirmed. The endpoint is live — it returns a well-formed 402 challenge — but what trade data it returns and what POST body it expects remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","trade-data","post-endpoint"],"categories":["finance","data"],"synonyms":["trade data API","x402 trades","crypto trade endpoint","USDC micropayment API","Base network API","pay-per-request trades","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All doc/pricing/README pages return only 'Connect wallet' with no content","The endpoint path '/api/v1/trades/1' suggests a specific resource (trade ID 1) but no explanation of what trade data is returned","Provider appears to be a demo or early-stage site; reliability and data quality are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/1","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/1","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 challenge, but there is no OpenAPI spec, no request/response schema, and all documentation pages beyond the landing page are empty (\"Connect wallet\" only). The purpose and parameters of the /api/v1/trades/1 endpoint are not documented anywhere in the 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'/request':17,34 '0.02':16,33,93,168 '000':97 '0x8335':86 '16':127 '20':96 '2913':87 '402':240 '6':101 'Base network API' 'USDC micropayment API' 'accept':67 'access':65,111 'across':129 'actual':192 'advertis':110 'ai':139 'ai/ml':48 'analysi':143 'analyt':47,133 'api':43,64,104 'base':9,26,81,98 'base-network' 'beyond':213 'bodi':251 'call':4,21 'cannot':227 'categori':131 'challeng':75,241 'classif':146 'collect':38 'confirm':229 'connect':182 'contract':85 'convers':162 'cost':91 'crawl':173 'crypto trade endpoint' 'data':6,23,46,51,132,136,245 'decim':102 'detail':189 'doc':176 'document':174,212 'embed':147 'enabl':42 'endpoint':7,24,44,57,128,198,231 'estim':157 'exampl':208 'exchang':152 'expect':253 'export':137 'feed':151 'financ':148 'finance/web3':50 'form':239 'format':224 'four':130 'gas':156 'gate':70 'generat':163 'geocod':160 'grant':113 'header':119 'host':36 'howev':171 'infer':49 'infrastructur':53,159 'input':220 'insight':138 'key':105 'land':123,215 'learn':141 'limit':108 'list':61,125,217 'live':233 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'maximum':90 'metric':134 'network':82 'no-api-key' 'openapi':205 'page':124,175,216 'paramet':221 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request trades' 'payload':209 'payment':74,76,118 'per':3,20,94,169 'post':68,250 'post-endpoint' 'precis':219 'premium':63 'price':150,166,177 'prompt':184 'provid':121 'pure':114 'quot':155 'rate':107,153 'readm':178 'remain':254 'report':135 'request':69,95,170 'request/response':193 'respons':223 'return':179,235,247 'rough':126 'schema':194 'sentiment':142 'settl':12,29,78 'span':45 'spec':206 'specif':56 'summar':145 'technic':188 'text':144 'token':154 'trade':5,22,197,244 'trade data API' 'trade-data' 'unclear':255 'unit':99 'unknown':200 'usdc':14,31,84 'usdc-settlement' 'util':54 'valid':161 'via':10,27,115 'wallet':183 'web3':149 'well':238 'well-form':237 'x402':11,28,41,73,117 'x402 trades' 'x402-enabled':40 'x402-payment'","prices":[{"id":"b98189e0-c804-48d5-8547-bd4437c7d70a","listingId":"d3a8ea5d-229b-43a4-8bcb-76b74e5d7f0d","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:32.171Z"}],"sources":[{"listingId":"d3a8ea5d-229b-43a4-8bcb-76b74e5d7f0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:32.171Z","lastSeenAt":"2026-04-26T08:32:38.528Z"}],"details":{"listingId":"d3a8ea5d-229b-43a4-8bcb-76b74e5d7f0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/1 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/1"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/1"},{"claim":"The site lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data on demand without subscription or API key management","Agent-driven workflows that need per-call payment for financial data","Programmatic access to trade information settled via on-chain USDC micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go trade data access","AI agents that can settle x402 payments autonomously on Base","Prototyping financial data integrations without signup or rate limits"],"notFor":["High-volume production use cases where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.536Z"},"updatedAt":"2026-04-26T08:32:38.528Z"}}