{"id":"e5bed704-c451-4289-9726-c49077f153b4","shortId":"ZDrTSg","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","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/138` appears to be part of a broader platform offering data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utility endpoints — all gated behind per-request USDC micropayments.\n\nThe x402 challenge confirms the endpoint is live and accepts payments in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment timeout is 300 seconds.\n\nHowever, the specific functionality of `/api/v1/trades/138` is unclear. The path suggests a trade-related resource (possibly retrieving or executing a trade record with ID 138), but no documentation, request schema, or response schema is available. The site's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without knowing what this endpoint actually returns, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request","USDC API","Base network API","trades endpoint","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/trades/138 is undocumented — the path suggests trade data but no schema or description is available beyond the generic 'Premium API Access' label.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request body schema or response schema is provided; callers must discover behavior experimentally.","The endpoint path includes a numeric ID (138) which may refer to a specific resource that could become stale or invalid."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/trades/138 is unknown. The docs pages are empty beyond a wallet-connect 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'0.02':10,24,106 '000':101 '0x8335':91 '138':170 '20':100 '2913':92 '300':143 '6':111 'Base network API' 'USDC API' 'accept':86 'access':6,20,36,124 'actual':205 'advertis':115 'ai/ml':61 'amount':98 'analyt':60 'api':5,19,35,117,187 'appear':50 'attach':127 'avail':180 'base':8,22,44,94,102 'base-network' 'behind':71 'broader':56 'caller':125,207 'challeng':79 'confirm':80 'connect':193 'content':199 'contract':90 'data':59,64 'decim':112 'doc':184 'document':173 'endpoint':30,68,82,204 'equal':105 'execut':164 'exploratori':213 'finance/web3':63 'function':148 'gate':3,17,70 'header':132 'howev':145 'id':169 'infer':62 'infrastructur':66 'instant':123 'integr':214 'key':118 'know':201 'limit':121 'live':84 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':97 'micropay':76 'micropayment API' 'network':45 'no-api-key' 'offer':58 'page':188 'part':53 'path':154 'pay':9,23 'pay-per-request' 'payment':40,87,131,137,140 'per':11,25,73,107 'per-request':72 'per-request-billing' 'platform':57,114 'possibl':161 'post-endpoint' 'premium':4,18,34 'price':185 'prompt':195 'proof':138 'protocol':41 'provid':33 'rate':120 'record':167 'relat':159 'render':190 'request':12,26,74,108,174 'resourc':48,160 'respons':177 'retriev':162 'return':206 'schema':175,178 'second':144 'simpli':126 'site':182 'specif':47,147 'suggest':155 'timeout':141 'trade':158,166 'trade-rel':157 'trades endpoint' 'treat':209 'unclear':152 'unit':103 'usdc':14,28,75,89,109 'usdc-micropayment' 'use':110 'util':67 'valid':135 'via':37 'wallet':194 'without':200 'x':130 'x-payment':129 'x402':2,16,39,78,136 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87b4243c-86e7-4262-9ab2-46b65b35869e","listingId":"e5bed704-c451-4289-9726-c49077f153b4","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:40.206Z"}],"sources":[{"listingId":"e5bed704-c451-4289-9726-c49077f153b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:40.206Z","lastSeenAt":"2026-04-26T07:03:05.549Z"}],"details":{"listingId":"e5bed704-c451-4289-9726-c49077f153b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/138 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/138"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/138"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related operations via a single micropayment","Exploring x402 payment protocol integration with USDC on Base","Building agent workflows that pay per API call without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who prefer no subscriptions or commitments"],"notFor":["Users who need detailed API documentation before integrating","High-volume production workloads where per-request pricing at $0.02 may add up","Anyone needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.185Z"},"updatedAt":"2026-04-26T07:03:05.549Z"}}