{"id":"348e911a-46d0-4ec6-acc0-d155be64ab62","shortId":"TjBc4F","kind":"x402","title":"Perpetual-swap liquidity data via x402 micropayment on Base, $0.02/request in USDC.","tagline":"Perpetual-swap liquidity data via x402 micropayment on Base, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides DeFi perpetual-swap (PERP) liquidity data behind an x402 paywall. It accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme to a specified wallet address, with no API keys, rate limits, or subscriptions required.\n\nThe provider operates a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all priced at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and focuses on perpetual-swap liquidity information, though the exact response schema and supported request parameters are not documented in the available material. The crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no further technical documentation.\n\nBecause no OpenAPI spec, request/response schema, or usage examples are available, the precise fields accepted in the POST body and the structure of the returned liquidity data remain unknown. Agents should expect a JSON response (the x402 challenge declares mimeType \"application/json\") but will need to experiment or contact the provider for detailed field-level documentation.","tags":[],"capabilities":["defi-liquidity-data","perpetual-swap-data","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["finance","defi","crypto"],"synonyms":["perp liquidity","perpetual swap liquidity","DeFi liquidity API","PERP market depth","x402 DeFi data","crypto liquidity endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no technical content.","Request body schema and response schema are completely unknown; no examples exist in crawled material.","The endpoint's specific data coverage (which perp markets, which DEXes) is not described anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/PERP/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/PERP/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual data returned is entirely 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'0.02':11,25,51,121 '000':56 '20':55 '6':68 'DeFi liquidity API' 'PERP market depth' 'accept':46,190 'address':85 'agent':205 'ai/ml':110 'analyt':109 'api':88 'application/json':216 'avail':155,186 'base':10,24,57,63 'base-network' 'behind':41 'bodi':194 'broad':99 'call':54,105 'catalog':100 'categori':132 'chain':75 'challeng':213 'charg':50 'connect':168 'contact':223 'crawl':158 'crypto liquidity endpoint' 'data':5,19,40,108,114,202 'decim':69 'declar':214 'defi':34 'defi-liquidity-data' 'detail':227 'doc':159 'document':152,175,231 'endpoint':30,106,126 'exact':79,143 'exampl':184 'expect':207 'experi':221 'field':189,229 'field-level':228 'financ':130 'finance/web3':112 'focus':134 'infer':111 'inform':140 'json':209 'key':89 'level':230 'limit':91 'liquid':4,18,39,139,201 'lowpaymentfee.com':32 'market':113 'materi':156 'micropay':8,22 'mimetyp':215 'need':219 'network':64 'no-api-key' 'on-chain':73 'openapi':178 'oper':97 'page':163 'paramet':149 'pay':103 'pay-per-cal':102 'pay-per-request' 'payment':70 'paywal':44 'per':53,104,122 'perp':38 'perp liquidity' 'perpetu':2,16,36,137 'perpetual swap liquidity' 'perpetual-swap':1,15,35,136 'perpetual-swap-data' 'post':47,193 'precis':188 'price':119,160 'prompt':170 'provid':33,96,225 'rate':90 'readm':162 'remain':203 'render':165 'request':48,123,148 'request/response':180 'requir':94 'respons':144,210 'return':200 'schema':145,181 'scheme':80 'servic':117 'settl':72 'sit':127 'span':107 'spec':179 'specif':125 'specifi':83 'structur':197 'subscript':93 'support':147 'swap':3,17,37,138 'technic':174 'though':141 'unit':58 'unknown':204 'usag':183 'usdc':14,28,52,60,66 'usdc-payment' 'util':116 'via':6,20,76 'wallet':84,169 'web3':131 'x402':7,21,43,78,212 'x402 DeFi data' 'x402-micropayment'","prices":[{"id":"50b31842-abae-48d5-a252-40317b7fe12a","listingId":"348e911a-46d0-4ec6-acc0-d155be64ab62","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/PERP/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":"2026-04-18T18:34:24.490Z"}],"sources":[{"listingId":"348e911a-46d0-4ec6-acc0-d155be64ab62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/PERP/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:24.490Z","lastSeenAt":"2026-04-23T00:31:02.340Z"}],"details":{"listingId":"348e911a-46d0-4ec6-acc0-d155be64ab62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/PERP/liquidity \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/PERP/liquidity"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/PERP/liquidity"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time liquidity depth for perpetual-swap markets","Feeding DeFi liquidity metrics into trading bots or dashboards","Comparing perp liquidity across venues programmatically"],"bestFor":["Agents or bots that need on-demand DeFi liquidity snapshots without managing API keys","Developers building perp-trading tools who want pay-per-call pricing","Crypto analytics dashboards requiring liquidity data on Base"],"notFor":["Users who need free or bulk-discounted high-frequency data feeds","Anyone requiring detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:53:05.107Z"},"updatedAt":"2026-04-23T00:31:02.340Z"}}