{"id":"dad7a02c-dfe4-41c3-94b4-97b9152df4e0","shortId":"h4kvz3","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":"This endpoint at `/api/v1/trades/12` 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/12` resource is listed under \"Premium API Access\" but its exact data payload is not documented in the available crawl material. The site groups its endpoints into categories including trade/finance data, AI inference, and utility services. Based on the URL pattern (`/trades/12`), this likely returns trade-related data for a specific resource identified by ID 12, but the response schema is not published.\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which has 6 decimals, equaling $0.02). Payment is made inline via the x402 `exact` scheme on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. No OpenAPI spec or detailed documentation was found beyond the landing page overview.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","json-response","no-api-key","trade-data"],"categories":["finance","data"],"synonyms":["trade data API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto trade endpoint","402 payment API"],"warnings":["No OpenAPI or response schema available — the actual data returned by /api/v1/trades/12 is unknown","Documentation pages (/docs, /pricing, /README) are empty or require wallet connection to view","The specific meaning of 'trades/12' (trade ID? category?) is undocumented","No examples of request body or response body found in crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no documentation of what /api/v1/trades/12 actually returns, and the docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. The listing is essentially a stub with confirmed 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'/request':17,34 '/trades/12':136 '0.02':16,33,161,182 '000':172 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '12':151 '20':171 '402 payment API' '6':179 'Base network API' 'USDC pay-per-call' 'accept':73,202 'access':102 'address':198 'advertis':167 'ai':126 'ai/ml':57 'analyt':56 'api':53,84,101 'application/json':207 'avail':113 'base':9,26,71,131,173,194 'base-network' 'beyond':216 'call':4,21 'categori':122 'challeng':166 'coin':76 'collect':48 'commit':91 'crawl':114 'crypto trade endpoint' 'data':6,23,55,106,125,143 'decim':180 'detail':212 'document':110,213 'endpoint':7,24,36,63,120,201 'equal':181 'exact':105,190 'finance/web3':58 'found':215 'group':118 'id':150 'identifi':148 'includ':123 'infer':127 'infrastructur':60 'inlin':186 'json-response' 'key':85 'l2':195 'land':218 'like':138 'limit':88 'list':98 'lowpaymentfee' 'lowpaymentfee.com':43 'made':185 'materi':115 'maxamountrequir':169 'micropay':81 'network':72,196 'no-api-key' 'offer':46 'openapi':209 'overview':220 'page':219 'part':40 'pattern':135 'pay':2,19 'pay-per-cal':1,18 'payload':107 'payment':67,183 'per':3,20,79,162 'per-request':78 'per-request-pricing' 'platform':44 'post':203 'premium':100 'price':159 'protocol':52,68 'publish':158 'rate':87 'relat':142 'request':80,163,204 'requir':92 'resourc':96,147 'respons':154 'return':139,206 'schema':155 'scheme':191 'servic':130 'settl':12,29 'site':117 'span':54 'spec':210 'specif':94,146 'trade':5,22,141 'trade data API' 'trade-data' 'trade-rel':140 'trade/finance':124 'unit':174 'url':134 'usd':75 'usdc':14,31,74,176 'usdc-settlement' 'use':64 'util':61,129 'via':10,27,187 'x402':11,28,51,66,165,189 'x402 micropayment API' 'x402-payment' 'x402-protocol':50","prices":[{"id":"e8281bf6-3ba3-452d-b5d5-162a3dc35677","listingId":"dad7a02c-dfe4-41c3-94b4-97b9152df4e0","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:33.397Z"}],"sources":[{"listingId":"dad7a02c-dfe4-41c3-94b4-97b9152df4e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:33.397Z","lastSeenAt":"2026-04-26T09:03:50.203Z"}],"details":{"listingId":"dad7a02c-dfe4-41c3-94b4-97b9152df4e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/12 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/trades/12"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/trades/12"}],"useCases":["Fetching trade-related data on demand without subscription or API key management","Integrating pay-per-call financial data into autonomous agent workflows","Demonstrating x402 protocol micropayments on Base network"],"bestFor":["Agents or apps that need on-demand trade data with no signup","Developers experimenting with x402 micropayment protocol","Low-volume consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume consumers needing bulk/batch trade data at discounted rates","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.513Z"},"updatedAt":"2026-04-26T09:03:50.203Z"}}