{"id":"46ef2e08-c899-4aba-b44f-5fac8059b88d","shortId":"Yaxcm2","kind":"x402","title":"DeFi liquidity data for LRC (Loopring) via pay-per-call x402 on Base network.","tagline":"DeFi liquidity data for LRC (Loopring) via pay-per-call x402 on Base network.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for the LRC (Loopring) token. It is part of a broader suite of APIs offered by the provider spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the provider's advertised flat $0.02/request pricing across all endpoints. No API keys are required; access is granted immediately upon valid x402 payment. The provider advertises no rate limits.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the liquidity endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data schema and response format must be discovered by calling it. The specific endpoint path suggests it returns liquidity metrics for the LRC token in a DeFi context, but the exact fields, data sources, and update frequency are unknown.","tags":[],"capabilities":["defi-liquidity-data","lrc-loopring","x402-payment","usdc-base-network","pay-per-request","no-api-key"],"categories":["defi","finance"],"synonyms":["Loopring liquidity","LRC liquidity API","DeFi liquidity endpoint","token liquidity data","Loopring DeFi data","crypto liquidity API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or output schema provided; request and response formats are unknown","No information on data sources, update frequency, or coverage for LRC liquidity data","Provider offers a very broad set of endpoints (analytics, AI, finance, utils) all at $0.02 — quality and depth of each is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/LRC/liquidity","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/defi/LRC/liquidity","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 with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual data returned is entirely 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'lrc-loopring' 'maximum':100 'metric':224 'must':210 'network':15,30,76 'no-api-key' 'offer':53 'openapi':175 'page':160 'part':46 'path':219 'pay':9,24 'pay-per-cal':8,23 'pay-per-request' 'payment':71,85,143 'per':10,25,103 'post':80 'price':127,157 'prompt':167 'proper':199 'protocol':72 'provid':35,56,121,145 'rate':148 'readm':159 'render':162 'request':81 'request/response':178 'requir':102,135 'respons':208 'return':83,191,197,222 'schema':176,206 'scheme':98 'settl':87 'sourc':238 'span':57 'spars':153 'specif':217 'substant':170 'suggest':220 'suit':50 'token':43,228 'token liquidity data' 'unit':109 'unknown':243 'updat':240 'upon':140 'usd':117 'usdc':89,111 'usdc-base-network' 'use':94 'util':65 'valid':141 'via':7,22 'wallet':166 'x402':12,27,70,96,142 'x402-payment'","prices":[{"id":"73836c4a-0d10-4695-9e6a-4e62b431ba35","listingId":"46ef2e08-c899-4aba-b44f-5fac8059b88d","amountUsd":null,"unit":"per_call","nativeCurrency":"USD 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:43.370Z"}],"sources":[{"listingId":"46ef2e08-c899-4aba-b44f-5fac8059b88d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/LRC/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:43.370Z","lastSeenAt":"2026-04-22T21:30:27.845Z"}],"details":{"listingId":"46ef2e08-c899-4aba-b44f-5fac8059b88d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/LRC/liquidity \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/defi/LRC/liquidity"},{"claim":"Max amount required is 20000 base units of USDC (= $0.02) per request","source_url":"https://lowpaymentfee.com/api/v1/defi/LRC/liquidity"},{"claim":"Provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/LRC/liquidity"},{"claim":"Documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying current 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