{"id":"a9bc9e2d-ce31-4dae-ba63-1085173cd608","shortId":"dnmwJz","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys required.","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/189` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base to the payee address 0x1A2B…85F3, using the x402 \"exact\" scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. There are no API keys, no rate limits, and no signup — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nWhile the platform advertises a wide catalog of endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, etc.), this specific listing covers only the `/api/v1/trades/189` resource. The exact data returned by this particular trade endpoint is not documented in the crawled material; the description simply says \"Premium API Access.\" Documentation pages (/docs, /pricing, /README) all resolve but contain only a \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","trades API","crypto payment API","402 payment required"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no usable content — only a 'Connect wallet' prompt.","The specific data returned by /api/v1/trades/189 is not documented anywhere in the crawled material.","No OpenAPI spec or request/response schema is available.","The broader platform advertises many endpoints but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/189","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty stubs showing only 'Connect wallet'. The purpose of /api/v1/trades/189 specifically is 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'/docs':220 '/pricing':221 '/readme':222 '0.02':10,27,86,138 '000':129 '0x1a2b':116 '0x8335':108 '20':128 '2913':109 '402 payment required' '6':134 '85f3':117 'Base network API' 'USDC micropayment API' 'accept':93 'access':6,23,42,217 'address':115 'advertis':168 'ai/ml':76 'amount':125 'analysi':177 'analyt':75 'api':5,22,41,71,143,216 'appear':56 'attach':153 'base':8,25,50,111,130 'base-network' 'broader':62 'call':70 'caller':151 'catalog':171 'chain':104 'classif':179 'connect':229 'contain':226 'contract':107 'cover':190 'crawl':209 'crypto payment API' 'data':74,79,197 'decim':135 'descript':212 'detail':236 'document':206,218 'dozen':65 'embed':180 'endpoint':36,72,92,173,203 'equal':137 'etc':186 'exact':121,196 'exchang':183 'feed':182 'finance/web3':78 'gate':3,20 'geocod':185 'header':158 'infer':77 'infrastructur':81 'json':98 'json-response' 'key':16,33,144 'limit':147 'list':189 'lowpaymentfee' 'lowpaymentfee.com':38 'materi':210 'maximum':124 'metric':174 'network':51 'no-api-key' 'offer':64 'on-chain':102 'page':219 'part':59 'particular':201 'pay':9,26,68 'pay-per-cal':67 'pay-per-call API' 'pay-per-request' 'paye':114 'payment':46,99,157,163 'per':11,28,69,87 'platform':63,167 'post':94 'post-method' 'premium':4,21,40,215 'price':84,181 'prompt':231 'proof':164 'protocol':47 'provid':39 'rate':146,184 'report':175 'request':12,29,88,95 'requir':17,34,126 'resolv':224 'resourc':54,194 'return':97,198 'say':214 'scheme':122 'sentiment':176 'settl':101 'signup':150 'simpli':152,213 'span':73 'specif':53,188 'summar':178 'technic':235 'trade':202 'trades API' 'unit':131 'usd':139 'usdc':14,31,90,106,133 'usdc-settlement' 'use':118 'util':82 'valid':161 'via':43,105 'wallet':230 'wide':170 'x':156 'x-payment':155 'x402':2,19,45,120,162 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"6cfe146a-5f45-41b6-912f-1f497688d54e","listingId":"a9bc9e2d-ce31-4dae-ba63-1085173cd608","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:55.660Z"}],"sources":[{"listingId":"a9bc9e2d-ce31-4dae-ba63-1085173cd608","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/189","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:55.660Z","lastSeenAt":"2026-04-26T03:03:00.055Z"}],"details":{"listingId":"a9bc9e2d-ce31-4dae-ba63-1085173cd608","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/189 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/189"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/189"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data on a per-request payment basis without needing API keys or subscriptions","Integrating low-cost pay-per-call endpoints into AI agent workflows via x402","Programmatic access to premium data feeds settled in USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 micropayments autonomously","Users who prefer on-chain USDC payments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.46Z"},"updatedAt":"2026-04-26T03:03:00.055Z"}}