{"id":"e244132f-e7ea-4087-88a6-e7c7d91f67d5","shortId":"mkTZES","kind":"x402","title":"x402-gated premium API access on Base network, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base network, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/trades/153` appears to be part of a broader platform offering data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utility APIs—all gated behind per-request USDC micropayments.\n\nThe x402 challenge confirms the endpoint is live and accepts payments in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access—callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific resource at `/api/v1/trades/153` is labeled \"Premium API Access\" but lacks detailed documentation about what data it returns. The broader site lists endpoints for metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation—all at the same $0.02/request price point. However, the `/trades/153` path suggests trade-related data, possibly a specific trade record or trading signal. Without further documentation, the exact response schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["trade data API","micropayment API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation available for the /api/v1/trades/153 endpoint—response schema is unknown","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content","The specific purpose of 'trades/153' is unclear—could be a trade record, signal, or placeholder","No OpenAPI spec or detailed schema provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/153","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation on what /api/v1/trades/153 actually returns, no request/response schema, and the crawled docs pages are empty ('Connect wallet' only). This is effectively a stub 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'/request':192 '/trades/153':197 '0.02':11,26,108,191 '000':103 '0x8335':93 '20':102 '2913':94 '6':113 'Base network API' 'USDC API' 'accept':88 'access':6,21,38,126,150 'advertis':117 'ai/ml':63 'amount':100 'analysi':169 'analyt':62 'api':5,20,37,70,119,149 'appear':52 'attach':129 'base':8,23,46,96,104 'base-network' 'behind':73 'broader':58,161 'caller':127 'challeng':81 'classif':172 'confirm':82 'contract':92 'convers':184 'data':61,66,157,203 'decim':114 'detail':153 'document':154,214 'embed':173 'endpoint':32,50,84,164 'equal':107 'estim':181 'exact':216 'exchang':176 'feed':175 'finance/web3':65 'gas':180 'gate':3,18,72 'generat':186 'geocod':182 'header':134 'howev':195 'infer':64 'infrastructur':68 'instant':125 'json-response' 'key':120 'label':147 'lack':152 'limit':123 'list':163 'live':86 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':99 'metric':166 'micropay':78 'micropayment API' 'network':9,24,47 'no-api-key' 'offer':60 'part':55 'path':198 'pay':10,25 'pay-per-call API' 'payment':42,89,133,139 'per':12,27,75,109 'per-request':74 'per-request-billing' 'platform':59,116 'point':194 'possibl':204 'premium':4,19,36,148 'price':174,193 'proof':140 'protocol':43 'provid':35 'quot':179 'rate':122,177 'record':208 'relat':202 'report':167 'request':13,28,76,110 'resourc':143 'respons':217 'return':159 'schema':218 'sentiment':168 'signal':211 'simpli':128 'site':162 'specif':49,142,206 'suggest':199 'summar':171 'text':170 'token':178 'trade':201,207,210 'trade data API' 'trade-rel':200 'unit':105 'unknown':220 'usdc':15,30,77,91,111 'usdc-micropayment' 'use':112 'util':69 'valid':137,183 'via':39 'without':212 'x':132 'x-payment':131 'x402':2,17,41,80,138 'x402 endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"121e407b-dc05-407c-a3f0-2fad99771c2f","listingId":"e244132f-e7ea-4087-88a6-e7c7d91f67d5","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:43.815Z"}],"sources":[{"listingId":"e244132f-e7ea-4087-88a6-e7c7d91f67d5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:43.815Z","lastSeenAt":"2026-04-26T05:32:45.790Z"}],"details":{"listingId":"e244132f-e7ea-4087-88a6-e7c7d91f67d5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/153 \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/153"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/153"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units (= $0.02 with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/trades/153"}],"useCases":["Accessing trade-related data with per-request USDC micropayments","Integrating pay-as-you-go API calls into autonomous agents","Fetching premium data without managing API keys or subscriptions"],"bestFor":["Agents that need keyless, pay-per-call API access","Developers wanting to avoid subscription commitments for sporadic API usage","Crypto-native applications already operating on Base network"],"notFor":["High-volume use cases where per-request fees add up (no bulk discount documented)","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.009Z"},"updatedAt":"2026-04-26T05:32:45.790Z"}}