{"id":"34bccde1-e255-44dc-8efb-63a7ae723caf","shortId":"JqQbUM","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, settling on the Base network using USDC. The specific resource path `/api/v1/trades/195` suggests a trades-related data endpoint, though the exact response payload is not documented. The site advertises a broad catalog of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests with an exact-payment scheme. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. No API keys or rate limits are advertised — access is granted purely through per-request micropayment.\n\nDocumentation is extremely sparse. The docs, API, pricing, 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/195` endpoint actually returns. The endpoint appears to be part of a larger platform offering many similarly priced endpoints, but without documentation it is unclear what input parameters are accepted or what data is returned.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","trades-data"],"categories":["finance","data"],"synonyms":["trade data API","x402 trades endpoint","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","crypto trades"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/trades/195 is not listed in the site's public API catalog, making its purpose unclear.","No request or response schema is provided; consumers cannot know what to send or expect back.","No OpenAPI or machine-readable spec discovered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/195","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint accepts or returns. No OpenAPI spec, no examples, no request/response schema. The docs pages are empty. The specific resource /api/v1/trades/195 is not mentioned anywhere on the site's landing page 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'0.02':10,28,102,137 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '20':127 '300':148 '6':133 'Base network API' 'USDC pay-per-call' 'accept':113,233 'access':6,24,44,159 'actual':206 'address':142 'advertis':79,158 'ai':91 'amount':124 'analyt':90 'api':5,16,23,34,43,87,152,174 'appear':210 'base':8,26,53,129,145 'base-network' 'broad':81 'catalog':82 'challeng':107 'confirm':108 'connect':183 'content':189 'crypto trades' 'data':67,89,236 'decim':134 'descript':200 'doc':173 'document':76,168,225 'endpoint':38,68,110,205,209,222 'equal':136 'exact':71,119 'exact-pay':118 'extrem':170 'financ':94 'gate':3,21,86 'grant':161 'infrastructur':97 'input':230 'key':17,35,153 'larger':216 'learn':93 'limit':156 'live':112 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':92 'mani':219 'max':123 'micropay':167 'micropayment API' 'network':54 'no-api-key' 'offer':218 'openapi':193 'page':178 'paramet':231 'part':213 'path':60 'pay':9,27 'payload':73 'payment':48,120,138 'per':11,29,103,165 'per-request':164 'per-request-billing' 'platform':217 'post':114 'premium':4,22,42 'price':100,175,221 'prompt':185 'protocol':49 'provid':41 'pure':162 'rate':155 'readm':177 'relat':66 'render':180 'request':12,30,104,115,166 'request/response':196 'requir':18,36,125 'resourc':59 'respons':72 'return':207,238 'schema':197 'scheme':121 'second':149 'sent':140 'settl':50 'similar':220 'site':78 'span':88 'spars':171 'spec':194 'specif':58 'suggest':62 'though':69 'timeout':150 'trade':65 'trade data API' 'trades-data' 'trades-rel':64 'unclear':228 'unit':130 'usdc':14,32,56,132 'usdc-micropayment' 'use':55 'util':98 'via':45 'wallet':184 'web3':95 'without':224 'x402':2,20,47,85,106 'x402 trades endpoint' 'x402-gated':1,19,84 'x402-payment'","prices":[{"id":"3550282e-0ac5-4613-ad58-0e678445b17a","listingId":"34bccde1-e255-44dc-8efb-63a7ae723caf","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:49.720Z"}],"sources":[{"listingId":"34bccde1-e255-44dc-8efb-63a7ae723caf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:49.720Z","lastSeenAt":"2026-04-26T09:03:50.868Z"}],"details":{"listingId":"34bccde1-e255-44dc-8efb-63a7ae723caf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/195 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/195"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/195"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade-related data with per-request USDC micropayments","Agent-driven data retrieval without pre-registration or API keys","Programmatic access to financial or trade information on demand"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols","Low-volume consumers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.739Z"},"updatedAt":"2026-04-26T09:03:50.868Z"}}