{"id":"cc7fad29-4f6c-426b-9c7a-69cd815c4239","shortId":"XusmzX","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/9` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several 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 are priced at $0.02 per request. However, the specific `/api/v1/trades/9` endpoint does not clearly map to any of these listed categories, and no documentation describes what data or functionality it returns.\n\nThe endpoint is confirmed live — it returns a proper HTTP 402 challenge with x402 version 1 headers. Documentation on the site is extremely thin; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data endpoint","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/trades/9 does not appear in the site's listed API catalog, so its purpose is unknown.","No request body schema or response schema is documented or discoverable.","No OpenAPI specification found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the specific endpoint path '/api/v1/trades/9' is not described anywhere on the site. The docs pages are empty. This is effectively a stub 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'0.02':10,28,92,170 '000':88 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':79 '1':213 '20':87 '402':208 '6':98 'Base network API' 'USDC micropayment API' 'accept':70 'access':6,24,68 'across':130 'advertis':128 'ai':140 'amount':85 'analysi':144 'analyt':134 'api':5,16,23,34,49,67,101,224 'attach':112 'avail':252 'base':8,26,57,81,89 'base-network' 'broader':125 'call':48 'caller':110 'categori':132,187 'challeng':209 'classif':147 'clear':180 'collect':43 'commit':107 'confirm':201 'connect':233 'content':239 'contract':78 'convers':164 'crypto-paid API' 'data':133,137,193 'decim':99 'describ':191 'doc':223 'document':190,215 'embed':148 'endpoint':38,61,129,177,199 'estim':158 'exampl':250 'exchang':153 'export':138 'extrem':220 'feed':152 'financ':149 'function':195 'gas':157 'gate':3,21,50 'generat':165 'geocod':162 'header':117,214 'howev':173 'http':207 'i.e':91 'infrastructur':160 'insight':139 'key':17,35,102 'learn':142 'limit':104 'list':64,186 'live':202 'lowpaymentfee' 'lowpaymentfee.com':40,126 'machin':141 'map':181 'maximum':84 'metric':135 'network':58 'no-api-key' 'openapi':243 'page':228 'pay':9,27,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request' 'payload':251 'payment':73,116,122 'per':11,29,47,93,171 'platform':127 'post':71 'post-endpoint' 'premium':4,22,66 'premium data endpoint' 'price':151,168,225 'prompt':235 'proof':123 'proper':206 'protocol':54 'provid':41 'quot':156 'rate':103,154 'readm':227 'render':230 'report':136 'request':12,30,72,94,172 'request/response':246 'requir':18,36,109 'return':197,204 'schema':247 'sentiment':143 'settl':75 'sever':131 'simpli':111 'sinc':95 'site':218 'spec':244 'specif':60,175 'summar':146 'text':145 'thin':221 'token':155 'unit':90 'upfront':106 'usdc':14,32,77,96 'usdc-settlement' 'use':97 'util':161 'valid':120,163 'version':212 'via':51 'wallet':234 'web3':150 'x':115 'x-payment':114 'x402':2,20,53,121,211 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"5a22f4f0-f8f3-4f5e-bc98-82f59a1d2bf7","listingId":"cc7fad29-4f6c-426b-9c7a-69cd815c4239","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:19.527Z"}],"sources":[{"listingId":"cc7fad29-4f6c-426b-9c7a-69cd815c4239","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:19.527Z","lastSeenAt":"2026-04-25T22:32:43.189Z"}],"details":{"listingId":"cc7fad29-4f6c-426b-9c7a-69cd815c4239","quickStartSnippet":"# The endpoint requires an x402 payment proof in the X-PAYMENT header.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/trades/9 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge. Attach a valid X-PAYMENT header to complete the call.","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 x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/trades/9"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/9"},{"claim":"All listed APIs 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 site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium data or trade information without managing API keys","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into Web3 applications"],"bestFor":["Developers wanting zero-friction API access without subscriptions or API key management","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Applications requiring free or high-volume bulk access at lower marginal cost","Developers not set up for crypto payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.393Z"},"updatedAt":"2026-04-25T22:32:43.189Z"}}