{"id":"392aa685-8337-440a-af1c-3ecd184b7beb","shortId":"4USGr5","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/trades/15` suggests a finance/trading data endpoint, though the exact response payload is not documented. The provider operates a broader platform offering multiple API categories including data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge indicates a maximum amount of 20,000 base units, which at 6 decimals equals $0.02 USD per call. No API keys or rate limits are advertised; access is granted immediately upon payment. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation is extremely sparse—the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response bodies, and no description of what the `/api/v1/trades/15` endpoint specifically returns. The platform appears to be a demonstration or early-stage x402 payment gateway.","tags":[],"capabilities":["x402-payment","per-call-pricing","base-network","usdc-settlement","json-response","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trades API","x402 API","pay-per-call API","Base USDC API","lowpaymentfee","crypto trades endpoint","micropayment API"],"warnings":["No documentation available—docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or response schema provided; actual response payload is unknown","The specific meaning of '/api/v1/trades/15' (trade ID 15?) is undocumented","Platform may be a demo or early-stage project with no SLA guarantees"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/15","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/15","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/request in USDC on Base), but there is no documentation of request parameters, response schema, or what '/api/v1/trades/15' specifically returns. Docs pages are empty beyond a wallet-connect 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'/request':16,32 '0.02':15,31,86,117 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':108 '6':114 'Base USDC API' 'accept':137 'access':7,23,40,129 'advertis':128 'ai/ml':76 'amount':106 'analyt':75 'api':6,22,39,71,122,150 'appear':188 'application/json':142 'base':9,25,94,110 'base-network' 'bodi':175 'broader':67 'call':4,20,120 'categori':72 'challeng':102 'connect':159 'contract':98 'crypto trades endpoint' 'data':53,74,79 'decim':115 'demonstr':192 'descript':178 'detail':166 'doc':149 'document':62,144 'earli':195 'early-stag':194 'endpoint':34,54,136,183 'equal':116 'exact':57 'exampl':173 'extrem':146 'finance/trading':52 'finance/web3':78 'gateway':199 'grant':131 'immedi':132 'includ':73 'indic':103 'infer':77 'infrastructur':81 'json-response' 'key':123 'limit':126 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':105 'micropayment API' 'multipl':70 'network':10,26,95 'no-api-key' 'offer':69 'openapi':170 'oper':65 'page':154 'path':48 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'payload':59 'payment':44,89,134,198 'per':3,19,87,119 'per-call-pricing' 'platform':68,187 'post':138 'post-method' 'premium':5,21,38 'price':84,151 'prompt':161 'protocol':13,29,45 'provid':37,64 'rate':125 'readm':153 'render':156 'request':88,139 'request/response':174 'respons':58,143 'return':141,185 'schema':171 'settl':91 'spars':147 'specif':47,184 'stage':196 'suggest':50 'technic':165 'though':55 'trades API' 'unit':111 'upon':133 'usd':118 'usdc':97 'usdc-settlement' 'use':96 'util':82 'via':11,27,41 'wallet':160 'x402':12,28,43,101,197 'x402 API' 'x402-payment'","prices":[{"id":"a191b120-5071-4c64-a47d-92d76ad276ef","listingId":"392aa685-8337-440a-af1c-3ecd184b7beb","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:34.008Z"}],"sources":[{"listingId":"392aa685-8337-440a-af1c-3ecd184b7beb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:34.008Z","lastSeenAt":"2026-04-26T08:03:30.608Z"}],"details":{"listingId":"392aa685-8337-440a-af1c-3ecd184b7beb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/15 \\\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 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/15"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/15"}],"useCases":["Fetching trade data with per-request USDC micropayments","Integrating x402 payment-gated endpoints into agent workflows","Accessing premium financial data without subscription commitments"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call data access without API keys","Low-volume consumers who want no subscription overhead"],"notFor":["High-volume production workloads needing documented SLAs","Users who need detailed API documentation and response schemas","Anyone without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.469Z"},"updatedAt":"2026-04-26T08:03:30.608Z"}}