{"id":"3be399f2-19cd-490c-9c40-98a61ed542a1","shortId":"FBwKSX","kind":"x402","title":"DeFi liquidity data for MATIC via x402 micropayment on Base, $0.02 per request.","tagline":"DeFi liquidity data for MATIC via x402 micropayment on Base, $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for the MATIC token. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs, all gated behind the x402 payment protocol on the Base network. Each request costs $0.02 (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 each POST request.\n\nThe specific endpoint `/api/v1/defi/MATIC/liquidity` is categorized under Finance & Web3 and presumably returns liquidity pool or liquidity-related metrics for the MATIC (Polygon) token. However, the crawled documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the liquidity response contains or what parameters the POST body accepts. The endpoint is confirmed live (returns a valid 402 x402 challenge), but the actual data quality and schema remain unknown.\n\nPayment settles in USDC (contract 0x8335…2913) on the Base L2 network to address 0x1A2B…85F3. The x402 challenge specifies scheme \"exact\", maxAmountRequired of 20000 base units (= $0.02), and a timeout of 300 seconds. The output mimeType is application/json.","tags":[],"capabilities":["defi-liquidity-data","matic-token","x402-micropayment","base-network-settlement","usdc-payment","no-api-key","per-request-pricing"],"categories":["defi","finance"],"synonyms":["MATIC liquidity","Polygon liquidity data","DeFi liquidity API","MATIC pool data","crypto liquidity endpoint","x402 DeFi API"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No request body schema or response schema documented; callers must guess what to POST and what they receive.","The endpoint path /api/v1/defi/MATIC/liquidity is not listed on the provider's homepage among their advertised APIs, raising questions about its status.","Data source, freshness, and accuracy of the liquidity information are completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/MATIC/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/MATIC/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the documentation pages are empty beyond a wallet-connect prompt. The actual data returned is entirely unknown, making this effectively a stub 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'0.02':11,24,69,222 '000':71 '0x1a2b':209 '0x8335':200 '20':70 '20000':219 '2913':201 '300':227 '402':183 '6':80 '85f3':210 'DeFi liquidity API' 'MATIC liquidity' 'MATIC pool data' 'Polygon liquidity data' 'accept':174 'actual':188 'address':208 'ai/ml':49 'analyt':48 'api':54,83,134 'application/json':233 'attach':92 'base':10,23,64,72,77,204,220 'base-network-settlement' 'behind':57 'bodi':173 'broader':44 'caller':90 'categor':106 'challeng':185,213 'confirm':178 'connect':143 'contain':167 'contract':199 'cost':68 'crawl':127 'crypto liquidity endpoint' 'data':3,16,34,47,189 'decim':81 'defi':1,14,32 'defi-liquidity-data' 'descript':160 'detail':149 'doc':133 'document':128 'endpoint':28,103,176 'exact':216 'exampl':157 'extrem':130 'field':163 'financ':108 'finance/web3':51 'gate':56 'header':96 'howev':125 'infer':50 'infrastructur':53 'key':84 'l2':205 'limit':87 'liquid':2,15,33,113,117,165 'liquidity-rel':116 'live':179 'lowpaymentfee.com':30 'matic':5,18,37,122 'matic-token' 'maxamountrequir':217 'metric':119 'micropay':8,21 'mimetyp':231 'network':65,206 'no-api-key' 'offer':46 'openapi':153 'output':230 'page':138 'paramet':170 'part':41 'payment':60,95,195 'per':12,25 'per-request-pricing' 'platform':45 'polygon':123 'pool':114 'post':99,172 'presum':111 'price':135 'prompt':145 'protocol':61 'provid':31 'qualiti':190 'rate':86 'readm':137 'relat':118 'remain':193 'render':140 'request':13,26,67,100 'request/response':156 'requir':89 'respons':166 'return':112,180 'schema':154,192 'scheme':215 'second':228 'settl':196 'simpli':91 'specif':102 'specifi':214 'thin':131 'timeout':225 'token':38,124 'unit':73,221 'unknown':194 'usdc':75,198 'usdc-payment' 'valid':182 'via':6,19 'wallet':144 'web3':109 'x402':7,20,59,94,184,212 'x402 DeFi API' 'x402-micropayment'","prices":[{"id":"24c8a10e-fe88-4a03-890b-09749ceb9cec","listingId":"3be399f2-19cd-490c-9c40-98a61ed542a1","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/MATIC/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":"2026-04-18T18:33:39.216Z"}],"sources":[{"listingId":"3be399f2-19cd-490c-9c40-98a61ed542a1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/MATIC/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:39.216Z","lastSeenAt":"2026-04-23T00:30:59.082Z"}],"details":{"listingId":"3be399f2-19cd-490c-9c40-98a61ed542a1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/MATIC/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/MATIC/liquidity"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/MATIC/liquidity"}],"useCases":["Querying current liquidity metrics for MATIC in DeFi protocols","Building dashboards that display MATIC liquidity across pools","Automated trading bots that need liquidity depth data before executing swaps","Research and analytics on MATIC DeFi ecosystem liquidity"],"bestFor":["Agents or bots that need on-demand MATIC liquidity data without managing API keys","Developers prototyping DeFi tools who want pay-per-call pricing","x402-native applications on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-frequency use cases where $0.02 per call adds up significantly","Non-MATIC token liquidity queries (separate endpoints may exist but are not documented here)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:33:00.264Z"},"updatedAt":"2026-04-23T00:30:59.082Z"}}