{"id":"1008daa9-cd5e-4a96-8be9-c661ad963e46","shortId":"gneEbK","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 `/api/v1/trades/158` 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, using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific functionality behind `/api/v1/trades/158` is not documented in the crawled material. The path suggests it may return data about a particular trade (ID 158), but this is speculative. The broader platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium API access"],"warnings":["The specific purpose and response format of /api/v1/trades/158 is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path suggests trade-specific data but this is inferred from the URL pattern, not confirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/158","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/158","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 confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/trades/158 is undocumented. No request/response schema, no examples, and all documentation pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/docs':224 '/pricing':225 '/readme':226 '0.02':10,28,88,136 '000':127 '0x8335':110 '158':187 '20':126 '2913':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':95 'access':6,24,44 'ai/ml':78 'amount':121 'analysi':204 'analyt':77 'api':5,16,23,34,43,73,140 'appear':58 'attach':151 'base':8,26,52,113,128 'behind':166 'broader':64,193 'call':72,124 'caller':149 'chain':106 'classif':207 'commit':148 'connect':230 'content':236 'contract':109 'convers':219 'crawl':173 'data':76,81,181,200 'decim':133 'document':170,222 'dozen':67 'embed':208 'endpoint':38,74,94,196 'equal':135 'estim':216 'exact':117 'exchang':211 'export':201 'feed':210 'finance/web3':80 'function':165 'gas':215 'gate':3,21 'generat':221 'geocod':217 'header':156 'id':186 'infer':79 'infrastructur':83 'insight':202 'json':100 'json-api' 'key':17,35,141 'limit':144 'list':195 'lowpaymentfee' 'lowpaymentfee.com':40 'materi':174 'maximum':120 'may':179 'metric':198 'network':53 'no-api-key' 'offer':66 'on-chain':104 'page':223 'part':61 'particular':184 'path':176 'pay':9,27,70 'pay-per-cal':69 'pay-per-call API' 'pay-per-request' 'payment':48,101,155,161 'per':11,29,71,89,123 'platform':65,194 'post':96 'post-method' 'premium':4,22,42 'premium API access' 'price':86,209 'prompt':232 'proof':162 'protocol':49 'provid':41 'quot':214 'rate':143,212 'report':199 'request':12,30,90,97 'requir':18,36,122 'resourc':56 'return':99,180,227 'scheme':118 'sentiment':203 'settl':103 'simpli':150 'span':75 'specif':55,164 'specul':191 'subscript':147 'substant':235 'suggest':177 'summar':206 'text':205 'token':213 'trade':185 'trade data API' 'unit':129 'usdc':14,32,92,108,131 'usdc-base' 'use':114 'util':84 'valid':159,218 'via':45,107 'wallet':231 'x':154 'x-payment':153 'x402':2,20,47,116,160 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"cf983fb0-40bd-4fd0-b035-96d57ad4c528","listingId":"1008daa9-cd5e-4a96-8be9-c661ad963e46","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:41.389Z"}],"sources":[{"listingId":"1008daa9-cd5e-4a96-8be9-c661ad963e46","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:41.389Z","lastSeenAt":"2026-04-26T07:03:05.604Z"}],"details":{"listingId":"1008daa9-cd5e-4a96-8be9-c661ad963e46","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/158 \\\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 endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/trades/158"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/158"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data on a per-request payment basis without needing an API key","Integrating pay-per-call endpoints into autonomous agent workflows on Base","Accessing premium data feeds with USDC micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping workflows that need on-demand data without subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.083Z"},"updatedAt":"2026-04-26T07:03:05.604Z"}}