{"id":"a1abdbf5-bfa3-49b7-b7f5-ac761d3c49a3","shortId":"A3khyu","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, 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 resource `/api/v1/trades/157` appears to be part of a broader platform offering data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utility endpoints — all gated behind per-request USDC micropayments at $0.02 each.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base. The x402 challenge specifies a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys or rate limits are advertised; access is purely pay-per-call. The payment timeout is 300 seconds.\n\nThe specific functionality behind `/api/v1/trades/157` is unclear — the path suggests a trade-related resource (possibly a specific trade record or trade execution endpoint), but no documentation, request schema, or response schema is available for this particular route. The broader site lists categories like finance/price feeds, token quotes, and gas estimates, so this endpoint likely falls under the finance or trading domain. However, without concrete docs or example responses, the exact behavior cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","json-api","post-method","no-api-key"],"categories":["finance","data"],"synonyms":["trade data API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto trade endpoint","web3 API"],"warnings":["No documentation available for /api/v1/trades/157 — the specific functionality is unknown","No request or response schema provided; behavior must be discovered empirically","Docs, pricing, README, and API pages on the site all render as blank 'Connect wallet' prompts","The endpoint path suggests a specific trade resource (ID 157) but context is missing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what /api/v1/trades/157 actually returns. The crawled docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. This is effectively a stub 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'0.02':10,24,78,119 '000':109 '0x8335':97 '20':108 '2913':98 '300':139 '6':114 'Base network API' 'USDC pay-per-call' 'accept':82 'access':6,20,36,128 'advertis':127 'ai/ml':61 'analyt':60 'api':5,19,35,121 'appear':50 'avail':174 'base':8,22,44,100,110 'base-network' 'behavior':212 'behind':71,144 'broader':56,180 'call':134 'cannot':213 'categori':183 'chain':93 'challeng':103 'concret':205 'confirm':215 'contract':96 'crypto trade endpoint' 'data':59,64 'decim':115 'doc':206 'document':167 'domain':202 'endpoint':30,68,81,164,194 'equal':118 'estim':191 'exact':211 'exampl':208 'execut':163 'fall':196 'feed':186 'financ':199 'finance/price':185 'finance/web3':63 'function':143 'gas':190 'gate':3,17,70 'howev':203 'infer':62 'infrastructur':66 'json':87 'json-api' 'key':122 'like':184,195 'limit':125 'list':182 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':106 'micropay':76 'network':45 'no-api-key' 'offer':58 'on-chain':91 'part':53 'particular':177 'path':149 'pay':9,23,132 'pay-per-cal':131 'payment':40,88,136 'per':11,25,73,133 'per-request':72 'per-request-billing' 'platform':57 'possibl':156 'post':83 'post-method' 'premium':4,18,34 'protocol':41 'provid':33 'pure':130 'quot':188 'rate':124 'record':160 'relat':154 'request':12,26,74,84,168 'resourc':48,155 'respons':171,209 'return':86 'rout':178 'schema':169,172 'second':140 'settl':90 'site':181 'specif':47,142,158 'specifi':104 'suggest':150 'timeout':137 'token':187 'trade':153,159,162,201 'trade data API' 'trade-rel':152 'unclear':147 'unit':111 'usdc':14,28,75,95,117 'usdc-micropayment' 'util':67 'via':37,94 'web3 API' 'without':204 'x402':2,16,39,102 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87f57efc-8c71-4ba8-901b-3758bc058113","listingId":"a1abdbf5-bfa3-49b7-b7f5-ac761d3c49a3","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:44.412Z"}],"sources":[{"listingId":"a1abdbf5-bfa3-49b7-b7f5-ac761d3c49a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:44.412Z","lastSeenAt":"2026-04-26T05:32:45.751Z"}],"details":{"listingId":"a1abdbf5-bfa3-49b7-b7f5-ac761d3c49a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/157 \\\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":"The x402 challenge specifies maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/157"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/157"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade-related data or executing trade queries with per-request USDC payment","Integrating pay-per-call APIs into agent workflows without API key management","Accessing financial or trading data on-demand via x402 protocol"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment-gated endpoints","Use cases requiring low-cost, no-commitment API calls on Base"],"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 USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.026Z"},"updatedAt":"2026-04-26T05:32:45.751Z"}}