{"id":"db084297-39f3-45e3-8627-784b38668b9a","shortId":"gVbsgv","kind":"x402","title":"DeFi liquidity data for SAND token, paid per-request via x402 on Base.","tagline":"DeFi liquidity data for SAND token, paid per-request via x402 on Base.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for the SAND token (The Sandbox). It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol on the Base network, settling in USDC.\n\nThe specific endpoint `/api/v1/defi/SAND/liquidity` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the provider's stated flat pricing of $0.02 per request across all endpoints. No API keys are required; payment is handled entirely through the x402 payment header.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a wallet-connect prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what fields the liquidity response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means consumers must discover the response format empirically.","tags":[],"capabilities":["defi-liquidity-data","sand-token","x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key"],"categories":["defi","crypto"],"synonyms":["SAND liquidity","DeFi liquidity API","Sandbox token liquidity","crypto liquidity data","SAND DeFi","token liquidity endpoint"],"warnings":["No documentation available — docs, pricing, and API pages render only a wallet-connect prompt with no content","No OpenAPI or JSON schema describing request parameters or response fields","Response format for SAND liquidity data must be discovered empirically","This endpoint is not listed on the provider's homepage; only generic categories are shown, so its existence is inferred solely from the probe"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/SAND/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/SAND/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 and returns a valid x402 challenge with clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty beyond a wallet-connect prompt. The actual response format for SAND liquidity data is 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'0.02':115,133 '000':104 '0x8335':109 '20':103 '2913':110 '402':202 '6':120 'DeFi liquidity API' 'SAND DeFi' 'SAND liquidity' 'Sandbox token liquidity' 'accept':89 'across':136 'advertis':98 'ai/ml':64 'analyt':63 'api':55,140,161 'base':14,28,80,105,112 'base-network' 'broader':48 'call':54 'challeng':97,203 'confirm':197 'connect':169 'consist':124 'consum':210 'contain':193 'content':174 'cost':101 'crypto':67 'crypto liquidity data' 'data':3,17,36,62 'decim':121 'defi':1,15,34 'defi-liquidity-data' 'descript':186 'detail':185 'discov':212 'doc':158 'document':153,208 'empir':216 'endpoint':30,72,87,138,195 'entir':147 'equal':114 'exampl':182 'extrem':155 'field':189 'financ':66 'flat':130 'format':215 'handl':146 'header':152 'infer':65 'json':94 'key':141 'lack':206 'liquid':2,16,35,191 'live':198 'lowpaymentfee.com':32 'maximum':100 'mean':209 'must':211 'network':81 'no-api-key' 'offer':56 'openapi':178 'page':162 'paid':7,21 'part':45 'pay':52 'pay-per-cal':51 'payment':76,144,151 'per':9,23,53,116,134 'per-request':8,22 'per-request-pricing' 'post':90 'price':131,159 'prompt':170 'proper':201 'protocol':77 'provid':33,60,127 'render':164 'request':10,24,91,117,135 'request/response':181 'requir':143 'respons':192,214 'return':93,199 'sand':5,19,39 'sand-token' 'sandbox':42 'schema':179 'servic':70 'settl':82 'span':61 'spars':156 'specif':86 'state':129 'suit':49 'token':6,20,40 'token liquidity endpoint' 'unit':106 'usdc':84,108,118 'usdc-settlement' 'use':73,119 'util':69 'via':11,25 'wallet':168 'wallet-connect':167 'x402':12,26,75,96,150 'x402-payment'","prices":[{"id":"767b7498-c884-4978-bba9-618d45f177a1","listingId":"db084297-39f3-45e3-8627-784b38668b9a","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/SAND/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":"2026-04-18T18:34:40.001Z"}],"sources":[{"listingId":"db084297-39f3-45e3-8627-784b38668b9a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/SAND/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:40.001Z","lastSeenAt":"2026-04-22T23:00:50.310Z"}],"details":{"listingId":"db084297-39f3-45e3-8627-784b38668b9a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/SAND/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 provider advertises $0.02 per request flat pricing with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/SAND/liquidity"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units (=$0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/defi/SAND/liquidity"}],"useCases":["Querying real-time liquidity depth for SAND across DeFi protocols","Building dashboards that track SAND liquidity changes over time","Automated trading bots that need liquidity data before executing SAND trades","Portfolio analytics tools that assess liquidity risk for SAND holdings"],"bestFor":["Agents or bots needing on-demand SAND liquidity data without API key management","Developers who want pay-per-call DeFi data with no subscription commitment","x402-native applications settling micropayments on Base"],"notFor":["Users needing comprehensive DeFi analytics across many tokens in a single call","Anyone requiring detailed API documentation or guaranteed SLA before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:31:58.189Z"},"updatedAt":"2026-04-22T23:00:50.310Z"}}