{"id":"9c5103fe-fa97-4e43-b335-2359ecff0bf1","shortId":"D2X5s7","kind":"x402","title":"DeFi liquidity data for FXS token, paid per-request via x402 on Base network.","tagline":"DeFi liquidity data for FXS token, paid per-request via x402 on Base network.","description":"This endpoint provides DeFi liquidity information for the FXS (Frax Share) token. It is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. Each request costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API keys, subscriptions, or rate limits — just an x402 payment header.\n\nThe specific endpoint at `/api/v1/defi/FXS/liquidity` accepts POST requests and returns JSON. While the site's landing page lists many endpoint categories (analytics, AI/ML, finance, infrastructure), this particular endpoint falls under the DeFi / Finance & Web3 category. The exact response schema is not documented in the crawled material, so the structure of the returned liquidity data must be inferred from the endpoint path: it likely includes liquidity pool metrics, TVL, or similar DeFi analytics for the FXS token.\n\nThe platform advertises uniform $0.02 pricing across all endpoints, no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["defi-liquidity-data","fxs-token","x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key","json-response"],"categories":["defi","finance"],"synonyms":["FXS liquidity","Frax Share liquidity","DeFi liquidity API","FXS pool data","token liquidity endpoint","crypto liquidity data"],"warnings":["No request or response schema documented anywhere in crawled material","Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt","This specific endpoint (/api/v1/defi/FXS/liquidity) is not listed on the site's landing page catalog, raising questions about its provenance","Exact response format and fields are unknown — integration requires trial-and-error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/FXS/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/FXS/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 per request in USDC on Base). However, there is no documented request or response schema, no examples, and all documentation pages returned only a wallet-connect prompt. The specific data returned by this DeFi liquidity endpoint is entirely inferred from the URL 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'/docs':195 '/pricing':196 '/readme':197 '0.02':75,179 '000':77 '20':76 '6':83 'DeFi liquidity API' 'FXS liquidity' 'FXS pool data' 'Frax Share liquidity' 'accept':104 'access':192 'across':181 'advertis':177 'ai/ml':121 'analyt':120,170 'api':60,88,185 'base':14,29,68,78 'base-network' 'broad':53 'call':59 'catalog':54 'categori':119,133 'connect':201 'content':207 'cost':74 'crawl':143 'crypto liquidity data' 'data':3,18,152 'decim':84 'defi':1,16,34,130,169 'defi-liquidity-data' 'detail':209 'document':140,193 'endpoint':32,101,118,126,158,183 'exact':135 'fall':127 'financ':122,131 'frax':40 'fxs':5,20,39,173 'fxs-token' 'header':98 'includ':162 'infer':155 'inform':36 'infrastructur':123 'instant':191 'json':109 'json-response' 'key':89,186 'land':114 'like':161 'limit':93,189 'liquid':2,17,35,151,163 'list':116 'lowpaymentfee.com':48 'mani':117 'materi':144 'metric':165 'must':153 'network':15,30,69 'no-api-key' 'offer':51 'page':115,194 'paid':7,22 'part':45 'particular':125 'path':159 'pay':57 'pay-per-cal':56 'payment':97 'per':9,24,58 'per-request':8,23 'per-request-pricing' 'platform':49,176 'pool':164 'post':105 'price':180 'prompt':203 'protocol':65 'provid':33 'rate':92,188 'request':10,25,73,106 'request/response':210 'requir':86 'respons':136 'return':108,150,198 'schema':137,211 'settl':61 'share':41 'similar':168 'site':112 'specif':100 'structur':147 'subscript':90 'substant':206 'token':6,21,42,174 'token liquidity endpoint' 'tvl':166 'unavail':213 'uniform':178 'unit':79 'usdc':71,81 'usdc-settlement' 'use':70 'via':11,26,62 'wallet':202 'web3':132 'x402':12,27,64,96 'x402-payment'","prices":[{"id":"af14d311-d366-490a-a999-71ab4c3a628c","listingId":"9c5103fe-fa97-4e43-b335-2359ecff0bf1","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/FXS/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":"2026-04-18T18:37:29.999Z"}],"sources":[{"listingId":"9c5103fe-fa97-4e43-b335-2359ecff0bf1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/FXS/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:29.999Z","lastSeenAt":"2026-04-22T20:00:35.976Z"}],"details":{"listingId":"9c5103fe-fa97-4e43-b335-2359ecff0bf1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/FXS/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":"The endpoint returns a 402 challenge requiring x402 payment with USDC on Base network at maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/defi/FXS/liquidity"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/FXS/liquidity"}],"useCases":["Querying current liquidity metrics for the FXS (Frax Share) token across DeFi protocols","Building dashboards that track FXS liquidity depth over time","Automated trading bots that check FXS liquidity before executing swaps","Portfolio analytics tools needing real-time DeFi liquidity data"],"bestFor":["Agents or bots that need on-demand FXS liquidity data without managing API keys","Developers prototyping DeFi analytics with minimal setup","Pay-as-you-go access to token-specific liquidity information"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-frequency bulk data consumers who would benefit from subscription pricing","Non-crypto use cases unrelated to DeFi liquidity"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.832Z"},"updatedAt":"2026-04-22T20:00:35.976Z"}}