{"id":"9e458efd-bdf8-4ca2-a354-79c1b8b253e3","shortId":"f5Meyg","kind":"x402","title":"ICP liquidity data via pay-per-call x402 on Base (USDC, $0.02/request)","tagline":"ICP liquidity data via pay-per-call x402 on Base (USDC, $0.02/request)","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for ICP (Internet Computer Protocol) via a simple HTTP POST call, gated by the x402 payment protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no sign-up required. The caller includes an X-PAYMENT header with a valid x402 payment proof, and the server returns a JSON response with the requested liquidity information.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all priced at $0.02 per request and settled in USDC on Base. The specific `/api/v1/defi/ICP/liquidity` route is not listed on the provider's landing page among the showcased endpoints, but it responds with a valid x402 402 challenge, confirming it is live and operational.\n\nBecause there is no OpenAPI schema, no documentation beyond the landing page, and no example request/response payloads available, the exact shape of the input body and the returned liquidity data structure are unknown. Callers should expect a JSON response (mimeType is `application/json`) and should experiment with POST bodies to discover accepted parameters. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base mainnet.","tags":[],"capabilities":["defi-liquidity-data","icp-token","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["defi","finance"],"synonyms":["ICP liquidity","Internet Computer liquidity","DeFi liquidity API","ICP DeFi data","crypto liquidity endpoint","ICP pool data","x402 DeFi API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/defi/ICP/liquidity route is not listed among the provider's advertised APIs on the landing page","Request body format and response structure are completely unknown — no examples found","Docs, pricing, API, and README pages all returned only a 'Connect wallet' stub with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/ICP/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/ICP/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 (valid x402 402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example request/response, and this specific route is not even listed on the provider's landing page. Effectively a stub 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'/request':14,28 '0.02':13,27,57,134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':233 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':237 '402':167 'DeFi liquidity API' 'ICP DeFi data' 'ICP liquidity' 'ICP pool data' 'Internet Computer liquidity' 'accept':225 'address':232 'ai/ml':123 'among':156 'analyt':122 'api':65,119 'application/json':216 'avail':192 'base':11,25,62,142,239 'beyond':183 'bodi':199,222 'broader':108 'call':8,22,47,118 'caller':77,208 'challeng':168 'comput':40 'confirm':169 'contract':236 'cost':56 'crypto liquidity endpoint' 'data':3,17,36,121,127,204 'defi':34 'defi-liquidity-data' 'discov':224 'document':182 'dozen':113 'endpoint':30,103,159 'exact':194 'exampl':189 'expect':210 'experi':219 'finance/web3':125 'gate':48 'header':83 'http':45 'icp':1,15,38 'icp-token' 'includ':78 'infer':124 'inform':101 'input':198 'internet':39 'json':95,212 'json-response' 'key':66 'land':154,185 'limit':69 'liquid':2,16,35,100,203 'list':149 'live':172 'lowpaymentfee.com':32,110 'mainnet':240 'market':126 'mimetyp':214 'network':63 'no-api-key' 'offer':112 'openapi':179 'oper':174 'page':155,186 'paramet':226 'part':105 'pay':6,20,116 'pay-per-cal':5,19,115 'pay-per-call' 'payload':191 'payment':52,82,88,228 'per':7,21,117,135 'platform':109 'post':46,221 'price':132 'proof':89 'protocol':41,53 'provid':33,152 'rate':68 'request':55,99,136 'request/response':190 'requir':75 'respond':162 'respons':96,213 'return':93,202 'rout':146 'schema':180 'server':92 'servic':130 'settl':138,230 'shape':195 'showcas':158 'sign':73 'sign-up':72 'simpl':44 'span':120 'specif':144 'structur':205 'unknown':207 'usdc':12,26,59,140,235 'usdc-base' 'use':234 'util':129 'valid':86,165 'via':4,18,42 'x':81 'x-payment':80 'x402':9,23,51,87,166 'x402 DeFi API' 'x402-payment'","prices":[{"id":"b031f516-15ed-497b-987a-1c26a926e3e0","listingId":"9e458efd-bdf8-4ca2-a354-79c1b8b253e3","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/ICP/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":"2026-04-18T18:34:57.554Z"}],"sources":[{"listingId":"9e458efd-bdf8-4ca2-a354-79c1b8b253e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/ICP/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:57.554Z","lastSeenAt":"2026-04-22T23:00:51.324Z"}],"details":{"listingId":"9e458efd-bdf8-4ca2-a354-79c1b8b253e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/ICP/liquidity \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/defi/ICP/liquidity"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/defi/ICP/liquidity"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/defi/ICP/liquidity route is not among the endpoints listed on the landing page","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time ICP liquidity pool data for trading bots","Monitoring ICP DeFi liquidity depth from an autonomous agent","Integrating ICP liquidity metrics into a portfolio dashboard"],"bestFor":["Agents or bots that need on-demand ICP liquidity data without managing API keys","Developers building DeFi dashboards who want simple pay-per-call pricing","Automated trading systems that need programmatic access to liquidity info"],"notFor":["Users who need free or bulk-discounted high-volume data feeds","Anyone requiring detailed API documentation or guaranteed SLA before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.146Z"},"updatedAt":"2026-04-22T23:00:51.324Z"}}