{"id":"d94bb81b-376a-4a81-8fb3-370031503123","shortId":"R3kDrR","kind":"x402","title":"USDT liquidity data on DeFi markets, paid per-request via x402 on Base.","tagline":"USDT liquidity data on DeFi markets, paid per-request via x402 on Base.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for USDT, accessible via the x402 payment protocol on the Base network. Each request costs $0.02 in USDC (20,000 base units of USDC on Base, which has 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to a POST request and receive a JSON response.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/defi/USDT/liquidity` is not listed on the provider's landing page among the advertised endpoints, though the DeFi/finance category is represented by other endpoints. The exact response schema is not documented — no OpenAPI spec, detailed docs, or example responses were found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause documentation is essentially absent beyond the x402 challenge and the landing page overview, the precise fields returned by this liquidity endpoint are unknown. Callers should expect a JSON payload related to USDT liquidity metrics, but the structure must be discovered empirically.","tags":[],"capabilities":["defi-liquidity-data","usdt-market-data","x402-payment","base-network","per-request-pricing","no-api-key"],"categories":["defi","finance"],"synonyms":["USDT liquidity","DeFi liquidity API","tether liquidity","USDT pool data","DeFi market data","liquidity endpoint","USDT DeFi"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/defi/USDT/liquidity path is not listed among the provider's advertised APIs on the landing page","Docs, pricing, and API pages returned only 'Connect wallet' with no usable content","Response format and fields are entirely unknown — must be discovered empirically","This endpoint may be a stub or placeholder given its absence from the provider's own catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/USDT/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/USDT/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 (returns a valid x402 402 challenge), but there is no OpenAPI spec, no documentation, no example responses, and the specific /defi/USDT/liquidity path is not even listed among the provider's advertised endpoints. The response schema is completely 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'0.02':52,117 '000':56 '20':55 '6':65 'DeFi liquidity API' 'DeFi market data' 'USDT DeFi' 'USDT liquidity' 'USDT pool data' 'absent':187 'access':39 'advertis':135 'ai/ml':107 'among':133 'analyt':106 'api':68,100,170 'attach':77 'base':14,28,47,57,62 'base-network' 'beyond':188 'broader':97 'caller':75,207 'categori':140 'challeng':191 'connect':176 'content':182 'cost':51 'crawl':165 'data':3,17,36,105 'decim':66 'defi':5,19,34 'defi-liquidity-data' 'defi/finance':139 'detail':156 'discov':223 'doc':157,167 'document':152,184 'empir':224 'endpoint':30,92,122,136,145,204 'essenti':186 'exact':147 'exampl':159 'expect':209 'field':199 'finance/web3':109 'found':162 'header':81 'infer':108 'infrastructur':111 'json':89,211 'key':69 'land':131,194 'limit':72 'liquid':2,16,35,203,216 'liquidity endpoint' 'list':126 'lowpaymentfee.com':32,103 'market':6,20 'metric':217 'must':221 'network':48 'no-api-key' 'offer':101 'openapi':154 'overview':196 'page':132,171,195 'paid':7,21 'part':94 'payload':212 'payment':43,80 'per':9,23,118 'per-request':8,22 'per-request-pricing' 'post':84 'precis':198 'price':114,168 'prompt':178 'protocol':44 'provid':33,129 'rate':71 'receiv':87 'relat':213 'repres':142 'request':10,24,50,85,119 'requir':74 'respons':90,148,160 'return':173,200 'schema':149 'simpli':76 'span':104 'spec':155 'specif':121 'structur':220 'suit':98 'tether liquidity' 'though':137 'uniform':115 'unit':58 'unknown':206 'usdc':54,60 'usdt':1,15,38,215 'usdt-market-data' 'util':112 'via':11,25,40 'wallet':177 'x402':12,26,42,79,190 'x402-payment'","prices":[{"id":"48615766-45b5-4a38-99dc-3ec5f12c4c0f","listingId":"d94bb81b-376a-4a81-8fb3-370031503123","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/USDT/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":"2026-04-18T18:35:39.726Z"}],"sources":[{"listingId":"d94bb81b-376a-4a81-8fb3-370031503123","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/USDT/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:39.726Z","lastSeenAt":"2026-04-22T21:30:27.682Z"}],"details":{"listingId":"d94bb81b-376a-4a81-8fb3-370031503123","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/USDT/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/USDT/liquidity"},{"claim":"The provider advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the canonical USDC contract on Base","source_url":"https://lowpaymentfee.com/api/v1/defi/USDT/liquidity"},{"claim":"The /api/v1/defi/USDT/liquidity endpoint is not listed among the provider's advertised API endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time USDT liquidity across DeFi protocols","Monitoring USDT pool depth for trading or arbitrage decisions","Integrating USDT liquidity metrics into dashboards or bots","Agent-driven DeFi analytics pipelines that pay per call"],"bestFor":["Developers building DeFi analytics tools needing USDT liquidity data","AI agents that need pay-per-call access without API key management","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["Users needing detailed API documentation or guaranteed response schemas before integrating","High-frequency trading systems where $0.02 per request adds up quickly","Non-USDT or non-DeFi data needs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.036Z"},"updatedAt":"2026-04-22T21:30:27.682Z"}}