{"id":"73c9cbd5-e814-4c21-8b00-9439fc51d68c","shortId":"cbfjAx","kind":"x402","title":"DeFi liquidity data for MASK token, paid per-request via x402 on Base.","tagline":"DeFi liquidity data for MASK token, paid per-request via x402 on Base.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for the MASK token. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled via the x402 protocol using USDC on the Base network.\n\nThe specific endpoint `/api/v1/defi/MASK/liquidity` accepts POST requests and returns JSON. Payment is handled inline via the x402 payment header — no API keys, accounts, or rate limits are required. The x402 challenge confirms the endpoint is live, requesting up to 20,000 base units of USDC (i.e., $0.02) per call, paid to a specified wallet address on Base. The payment scheme is \"exact\" with a 300-second timeout.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint's purpose (MASK token liquidity data) is inferred solely from the URL path and the platform's Finance & Web3 category listing. The actual request body format and response structure are unknown.","tags":[],"capabilities":["defi-liquidity-data","mask-token","x402-payment","usdc-base","per-request-pricing","no-api-key","json-response"],"categories":["defi","finance"],"synonyms":["MASK liquidity","MASK token DeFi","DeFi liquidity API","crypto liquidity data","MASK pool data","token liquidity endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found; request body format and response structure are unknown","The endpoint path suggests MASK token liquidity data but this is inferred from the URL only","This specific /defi/MASK/liquidity endpoint is not listed on the site's homepage API catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/MASK/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/MASK/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual behavior and data format are entirely unknown beyond what the URL path 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'0.02':60,121 '000':115 '20':114 '300':139 'DeFi liquidity API' 'MASK liquidity' 'MASK pool data' 'MASK token DeFi' 'accept':79 'account':97 'actual':208 'address':129 'ai/ml':51 'analyt':50 'api':56,95,152 'avail':179 'base':14,28,73,116,131 'bodi':210 'broader':46 'call':123 'categori':205 'challeng':105 'confirm':106 'connect':160 'content':166 'crawl':182 'crypto liquidity data' 'data':3,17,36,49,191 'defi':1,15,34 'defi-liquidity-data' 'doc':150 'document':142 'endpoint':30,77,108,185 'exact':136 'exampl':178 'extrem':147 'financ':203 'finance/web3':53 'format':211 'handl':87 'header':93 'i.e':120 'infer':52,193 'infrastructur':55 'inlin':88 'json':84 'json-response' 'key':96 'limit':100 'liquid':2,16,35,190 'list':206 'live':110 'lowpaymentfee.com':32 'mask':5,19,39,188 'mask-token' 'materi':183 'network':74 'no-api-key' 'offer':48 'openapi':170 'page':155 'paid':7,21,124 'part':43 'path':198 'payment':85,92,133 'per':9,23,61,122 'per-request':8,22 'per-request-pricing' 'platform':47,201 'post':80 'price':58,151 'prompt':162 'protocol':68 'provid':33 'purpos':187 'rate':99 'readm':154 'render':157 'request':10,24,62,81,111,209 'request/response':173 'requir':102 'respons':213 'return':83 'schema':174 'scheme':134 'second':140 'settl':64 'site':145 'sole':194 'spec':171 'specif':76 'specifi':127 'structur':214 'thin':148 'timeout':141 'token':6,20,40,189 'token liquidity endpoint' 'unit':117 'unknown':216 'url':197 'usag':177 'usdc':70,119 'usdc-base' 'use':69 'via':11,25,65,89 'wallet':128,161 'web3':204 'x402':12,26,67,91,104 'x402-payment'","prices":[{"id":"c0b1630f-f238-4e4b-a5c5-a101fe06523d","listingId":"73c9cbd5-e814-4c21-8b00-9439fc51d68c","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/defi/MASK/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:33.922Z"}],"sources":[{"listingId":"73c9cbd5-e814-4c21-8b00-9439fc51d68c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/MASK/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:33.922Z","lastSeenAt":"2026-04-23T02:00:20.094Z"}],"details":{"listingId":"73c9cbd5-e814-4c21-8b00-9439fc51d68c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/MASK/liquidity \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/defi/MASK/liquidity"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists Finance & Web3 APIs including price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying current liquidity metrics for the MASK token across DeFi protocols","Building dashboards that display MASK token liquidity depth","Automated trading bots that check MASK liquidity before executing trades","Portfolio analytics tools needing real-time DeFi liquidity snapshots"],"bestFor":["Agents or bots needing on-demand MASK liquidity data without API key setup","Developers prototyping DeFi tools who want pay-per-call pricing","x402-compatible clients on the Base network"],"notFor":["Users needing comprehensive multi-token liquidity aggregation in a single call","Anyone requiring detailed API documentation or guaranteed SLAs before integrating","Non-crypto use cases unrelated to DeFi data"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.302Z"},"updatedAt":"2026-04-23T02:00:20.094Z"}}