{"id":"286fed31-5b5d-4ca6-aab8-94c8010d9591","shortId":"Z7fMeY","kind":"x402","title":"Pay-per-call trades endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call trades endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/trades/137` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol on the Base network, accepting USDC (USD Coin) for per-request micropayments with no API keys, no rate limits, and no commitments required.\n\nThe specific `/api/v1/trades/137` endpoint is listed under \"Premium API Access\" but its exact functionality is not well-documented in the available crawl material. The endpoint is live and returns a proper 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the precise request/response schemas for this trades endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-micropayment","json-response","no-api-key","trades-data"],"categories":["finance","data"],"synonyms":["trades API","x402 trades","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet'","The exact purpose and response format of /api/v1/trades/137 is undocumented","No OpenAPI spec, no request/response schema, no example payloads available","The 'Premium API Access' label is generic and does not clarify what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/137","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/137","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, but there is no documentation on request parameters, response schema, or what 'trades/137' actually returns. All doc/pricing/API pages are empty beyond 'Connect wallet'. The listing is effectively a stub with confirmed 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'/request':16,32,196 '0.02':15,31,136,195 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '20':130 '300':151 '402':123 'Base network API' 'USDC API' 'accept':71,155 'access':100 'address':145 'advertis':164 'ai/ml':55 'analysi':173 'analyt':54 'api':51,82,99 'application/json':160 'avail':112 'base':8,24,69,132,139 'base-network' 'beyond':201 'broader':162 'call':4,20 'challeng':124 'classif':176 'coin':74 'collect':46 'commit':89 'connect':214 'convers':188 'crawl':113 'data':53,169 'document':109,200 'embed':177 'empti':207 'endpoint':6,22,34,61,94,116,154,165,224 'essenti':206 'estim':185 'exact':103 'exchang':180 'export':170 'feed':179 'finance/web3':56 'function':104 'gas':184 'generat':190 'geocod':186 'howev':199 'infrastructur':58 'insight':171 'json-response' 'key':83 'land':203 'limit':86 'list':96 'live':118 'lowpaymentfee' 'lowpaymentfee.com':41 'materi':114 'metric':167 'micropay':79 'micropayment API' 'network':70 'no-api-key' 'offer':44 'page':204,211 'part':38 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'payment':65,126,141 'per':3,19,77 'per-request':76 'per-request-micropayment' 'platform':42,163 'point':198 'post':156 'precis':218 'premium':98 'price':178,197 'proper':122 'protocol':50,66 'quot':183 'rate':85,181 'report':168 'request':78,125,157 'request/response':219 'requir':90 'return':120,159 'schema':220 'second':152 'sentiment':172 'settl':11,27,143 'show':213 'span':52 'specif':92 'sub':210 'sub-pag':209 'summar':175 'text':174 'timeout':149 'token':182 'trade':5,21,223 'trades API' 'trades-data' 'unit':133 'unknown':226 'usd':73,137 'usdc':13,29,72,135 'usdc-settlement' 'use':62 'util':59 'valid':187 'via':9,25 'wallet':215 'well':108 'well-docu':107 'x402':10,26,49,64 'x402 trades' 'x402-payment' 'x402-protocol':48","prices":[{"id":"082e5995-a0d2-49ff-8f23-1f793a1821dc","listingId":"286fed31-5b5d-4ca6-aab8-94c8010d9591","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:37.699Z"}],"sources":[{"listingId":"286fed31-5b5d-4ca6-aab8-94c8010d9591","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:37.699Z","lastSeenAt":"2026-04-26T07:03:05.456Z"}],"details":{"listingId":"286fed31-5b5d-4ca6-aab8-94c8010d9591","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/137 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/137"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/137"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data for asset ID 137 via a single micropayment","Integrating pay-per-call trade information into automated trading agents","Accessing premium trade data without managing API keys or subscriptions"],"bestFor":["Agents that need on-demand trade data without subscription overhead","Developers experimenting with x402 micropayment-gated APIs","Crypto-native applications already operating on Base network"],"notFor":["High-volume consumers needing bulk/subscription pricing","Users who need detailed API documentation and schemas before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.302Z"},"updatedAt":"2026-04-26T07:03:05.456Z"}}