{"id":"d3eba4a4-0a05-4e31-a5eb-b0f6456d562d","shortId":"tMEv8G","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 \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource `/api/v1/trades/139` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract `0x8335…2913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payments are sent to `0x1A2B…85F3` with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nHowever, the specific functionality of `/api/v1/trades/139` is unclear. The site's landing page lists categories like Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but does not mention a `/trades/` path. The `139` in the URL may be a resource or trade ID. No request/response schema documentation was found — the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation on what this particular endpoint accepts or returns, consumers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-api","no-api-key","http-post"],"categories":["finance","data"],"synonyms":["trades API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No documentation found for /api/v1/trades/139 — the path is not listed on the site's landing page","All doc/pricing/API/README pages returned only 'Connect wallet' with no content","The '139' in the URL may be a specific resource ID; the general /trades/ endpoint behavior is undocumented","Request and response schemas are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/139","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /trades/139 path, no request/response schema, and the docs pages are empty. The specific purpose of this endpoint is 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'/trades':178 '0.02':10,28,88,125 '000':120 '0x1a2b':134 '0x8335':110 '139':181 '20':119 '2913':111 '300':138 '6':128 '85f3':135 'Base network API' 'USDC micropayment API' 'accept':102,143,223 'access':6,24,44 'ai':167 'ai/ml':78 'amount':117 'analyt':77,166 'api':5,16,23,34,43,73,201 'appear':58 'application/json':148 'base':8,26,52,113,121 'base-network' 'broader':64 'call':72 'categori':163 'challeng':95 'confirm':96 'connect':209 'consum':226 'content':215 'contract':109 'crypto payment API' 'data':76,81,165 'decim':129 'doc':199 'document':195,217 'dozen':67 'endpoint':38,74,98,142,222 'equal':124 'exact':104 'exact-schem':103 'exploratori':232 'financ':169 'finance/web3':80 'found':197 'function':152 'gate':3,21 'howev':149 'http':144 'http-post' 'id':191 'infer':79 'infrastructur':83,172 'integr':233 'json-api' 'key':17,35 'land':160 'like':164 'list':162 'live':100 'lowpaymentfee' 'lowpaymentfee.com':40 'max':116 'may':185 'mention':176 'ml':168 'network':53 'no-api-key' 'offer':66 'page':161,204 'part':61 'particular':221 'path':179 'pay':9,27,70 'pay-per-cal':69 'pay-per-call API' 'pay-per-request' 'payment':48,106,130 'per':11,29,71,89 'platform':65 'post':145 'premium':4,22,42 'price':86,200 'prompt':211 'protocol':49 'provid':41 'readm':203 'request':12,30,90 'request/response':193 'requir':18,36 'resourc':56,188 'return':147,206,225 'schema':194 'scheme':105 'second':139 'sent':132 'site':158 'span':75 'specif':55,151 'substant':214 'timeout':140 'trade':190 'trades API' 'treat':228 'unclear':156 'unit':122 'url':184 'usdc':14,32,92,108,126 'usdc-payment' 'use':127 'util':84 'via':45 'wallet':210 'web3':170 'without':216 'x402':2,20,47,94 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"34184c0f-a1a7-4e1e-8bc3-68a7d9429fa8","listingId":"d3eba4a4-0a05-4e31-a5eb-b0f6456d562d","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:34.601Z"}],"sources":[{"listingId":"d3eba4a4-0a05-4e31-a5eb-b0f6456d562d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/139","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:34.601Z","lastSeenAt":"2026-04-26T08:32:38.589Z"}],"details":{"listingId":"d3eba4a4-0a05-4e31-a5eb-b0f6456d562d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/139 \\\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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/trades/139"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/139"},{"claim":"The site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure but does not list a /trades/ path","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data or executing trade lookups via a single paid API call","Integrating pay-per-request APIs into agent workflows without managing API keys","Exploring x402 protocol-based micropayment endpoints on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base automatically","Use cases needing keyless, per-call API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed trade analytics with guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.476Z"},"updatedAt":"2026-04-26T08:32:38.589Z"}}