{"id":"99fd5d2b-e06d-4c54-8617-0b5a4ca372cc","shortId":"taFQe8","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/136` 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 endpoint accepts POST requests and returns application/json responses.\n\nHowever, the specific `/api/v1/trades/136` path is not listed among the documented endpoints on the site's landing page, and no documentation describes what this particular trade resource returns. The crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the exact functionality and expected input/output of this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","json-api","post-method"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC gated endpoint","Base network API","trades API","lowpaymentfee"],"warnings":["The /api/v1/trades/136 path is not listed among the site's documented endpoints — its purpose is unclear.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema or request/response examples are available for this endpoint.","No input schema is documented; callers must guess at the expected POST body."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/136","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/136","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 the specific /api/v1/trades/136 resource is undocumented. No OpenAPI schema, no request/response examples, and all doc pages rendered only a wallet-connect prompt. The exact functionality is 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'0.02':10,24,106 '000':101 '0x8335':91 '20':100 '2913':92 '6':111 'Base network API' 'USDC gated endpoint' 'accept':86,141 'access':6,20,36,124 'advertis':115 'ai/ml':61 'among':156 'amount':98 'analyt':60 'api':5,19,35,117 'appear':50 'application/json':146 'attach':127 'base':8,22,44,94,102 'base-network' 'behind':71 'broader':56 'caller':125 'challeng':79 'confirm':80 'connect':187 'content':193 'contract':90 'crawl':177 'data':59,64 'decim':112 'describ':169 'detail':201 'doc':178 'document':158,168,202 'endpoint':30,68,82,140,159,211 'equal':105 'exact':204 'exampl':199 'expect':207 'finance/web3':63 'function':205 'gate':3,17,70 'header':132 'howev':148 'infer':62 'infrastructur':66 'input/output':208 'instant':123 'json-api' 'key':118 'land':164 'limit':121 'list':155 'live':84 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':97 'micropay':76 'micropayment API' 'network':45 'offer':58 'openapi':196 'page':165,182 'part':53 'particular':172 'path':152 'pay':9,23 'pay-per-request API' 'payment':40,87,131,137 'per':11,25,73,107 'per-request':72 'per-request-billing' 'platform':57,114 'post':142 'post-method' 'premium':4,18,34 'price':179 'prompt':189 'proof':138 'protocol':41 'provid':33 'rate':120 'readm':181 'remain':212 'render':184 'request':12,26,74,108,143 'request/response':198 'resourc':48,174 'respons':147 'return':145,175 'schema':197 'simpli':126 'site':162 'specif':47,150 'substant':192 'trade':173 'trades API' 'unclear':213 'unit':103 'usdc':14,28,75,89,109 'usdc-micropayment' 'use':110 'util':67 'valid':135 'via':37 'wallet':188 'without':194 'x':130 'x-payment':129 'x402':2,16,39,78,136 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"db00b35c-fd72-42f5-91b1-9cf47b1d8e47","listingId":"99fd5d2b-e06d-4c54-8617-0b5a4ca372cc","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:36.486Z"}],"sources":[{"listingId":"99fd5d2b-e06d-4c54-8617-0b5a4ca372cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:36.486Z","lastSeenAt":"2026-04-26T08:03:30.712Z"}],"details":{"listingId":"99fd5d2b-e06d-4c54-8617-0b5a4ca372cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/136 \\\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/136"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/136"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints under Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related queries with per-request USDC micropayments","Agent-driven API consumption without API keys or subscriptions","Programmatic access to premium data behind x402 payment gates"],"bestFor":["Developers wanting keyless, pay-per-use API access on Base","AI agents that can settle x402 micropayments autonomously","Users who prefer crypto-native per-call billing over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.35Z"},"updatedAt":"2026-04-26T08:03:30.712Z"}}