{"id":"3a45a494-6d91-4d28-bf7d-f9e1e7bdc80f","shortId":"Z7JEJR","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 path `/api/v1/trades/186` suggests a trade-data or financial-trade endpoint, though the exact response payload is not documented. The site advertises a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on Base.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02). Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. No API key or account registration is needed; callers simply attach a valid X-PAYMENT header to authorize each request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/trades/186` endpoint actually returns. The listing is functional but essentially undocumented beyond the payment challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","no-api-key","post-endpoint","trade-data"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto trade endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/trades/186","The exact nature of the data returned by this endpoint is undocumented and unclear","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/186","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint accepts or returns. No OpenAPI spec, no example requests/responses, and the docs pages are empty. The specific purpose of /api/v1/trades/186 is 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'/api/v1/trades/186':58,210 '/docs':179 '/pricing':180 '/readme':183 '0.02':10,28,101,140 '000':129 '0x1a2b':146 '0x8335':134 '20':128 '2913':135 '300':150 '6':138 '85f3':147 'Base network API' 'USDC micropayment API' 'accept':117 'access':6,24,44 'account':157 'actual':212 'address':145 'advertis':79 'ai/ml':91 'analyt':90 'api':5,16,23,34,43,87,154 'attach':163 'author':171 'base':8,26,52,108,130,137 'beyond':221 'broad':81 'caller':161 'catalog':82 'challeng':111,224 'confirm':112 'connect':189 'content':195 'crypto trade endpoint' 'data':63,89 'decim':139 'descript':206 'document':76,174 'endpoint':38,68,114,211 'essenti':219 'exact':71,124 'exact-schem':123 'extrem':176 'financ':93 'financi':66 'financial-trad':65 'function':217 'gate':3,21,86 'header':169 'infer':92 'infrastructur':96 'key':17,35,155 'list':215 'live':116 'lowpaymentfee' 'lowpaymentfee.com':40 'metadata':225 'need':160 'network':53 'no-api-key' 'openapi':199 'page':184 'path':57 'pay':9,27 'pay-per-call API' 'payload':73 'payment':48,126,141,168,223 'per':11,29,102 'per-request-billing' 'post':118 'post-endpoint' 'premium':4,22,42 'price':99 'prompt':191 'protocol':49 'provid':41 'registr':158 'render':186 'request':12,30,103,119,173 'request/response':202 'requir':18,36,121 'resourc':56 'respons':72 'return':213 'schema':203 'scheme':125 'second':151 'sent':143 'settl':104 'simpli':162 'site':78 'span':88 'spars':177 'spec':200 'specif':55 'suggest':59 'though':69 'timeout':152 'trade':62,67 'trade data API' 'trade-data':61 'undocu':220 'unit':131 'usdc':14,32,106,133 'usdc-base' 'util':97 'valid':165 'via':45 'wallet':190 'web3':94 'x':167 'x-payment':166 'x402':2,20,47,85,110 'x402 API' 'x402-gated':1,19,84 'x402-payment'","prices":[{"id":"74af70b8-5a12-41c6-84e8-d870efd04d9d","listingId":"3a45a494-6d91-4d28-bf7d-f9e1e7bdc80f","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:46.772Z"}],"sources":[{"listingId":"3a45a494-6d91-4d28-bf7d-f9e1e7bdc80f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:46.772Z","lastSeenAt":"2026-04-26T05:32:45.867Z"}],"details":{"listingId":"3a45a494-6d91-4d28-bf7d-f9e1e7bdc80f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/186 \\\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 HTTP 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/186"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/186"}],"useCases":["Fetching trade or financial data on a per-request payment basis without needing an API key","Integrating x402-compatible agents that autonomously pay for data access","Prototyping pay-per-call workflows using USDC on Base"],"bestFor":["Agents or bots that support x402 payment protocol","Developers wanting zero-signup, pay-per-use data access","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.914Z"},"updatedAt":"2026-04-26T05:32:45.867Z"}}