{"id":"c0745dea-1f57-4ff9-aa6e-478988073c6d","shortId":"FLcSg4","kind":"x402","title":"DeFi liquidity data for DOT via pay-per-call x402 on Base (USDC).","tagline":"DeFi liquidity data for DOT via pay-per-call x402 on Base (USDC).","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for the DOT (Polkadot) token. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. The endpoint is accessed via HTTP POST and is gated by the x402 payment protocol, settling in USDC on the Base network.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request by attaching an X-PAYMENT header with a valid x402 payment proof. The response MIME type is application/json.\n\nDocumentation is extremely sparse. The provider's docs, API, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the liquidity endpoint returns or what parameters it accepts. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data quality and response structure are unknown.","tags":[],"capabilities":["defi-liquidity-data","dot-polkadot","x402-payment","usdc-base-network","pay-per-request","json-response"],"categories":["defi","finance","crypto"],"synonyms":["Polkadot liquidity","DOT DeFi data","DOT liquidity pool","crypto liquidity API","DeFi analytics DOT"],"warnings":["No OpenAPI schema or request/response documentation available","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content","Response structure and accepted request parameters are completely unknown","Data quality and freshness of DOT liquidity information cannot be verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/DOT/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/DOT/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 with a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or what 'liquidity' data is actually returned. The docs/pricing/README pages are all blank wallet-connect stubs. Without any schema or examples, this is effectively a stub 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'000':98 '20':97 '402':194 '6':104 'DOT DeFi data' 'DOT liquidity pool' 'DeFi analytics DOT' 'Polkadot liquidity' 'accept':185 'access':73 'actual':198 'advertis':113 'ai/ml':63 'analyt':62 'api':54,107,145 'application/json':136 'attach':119 'base':13,27,90,99 'broader':47 'call':10,24 'caller':114 'challeng':195 'confirm':189 'connect':155 'crypto':66 'crypto liquidity API' 'data':3,17,36,61,199 'decim':105 'defi':1,15,34 'defi-liquidity-data' 'descript':173 'detail':162 'doc':144 'document':137 'dot':5,19,39 'dot-polkadot' 'endpoint':30,71,179,187 'exampl':170 'extrem':139 'field':176 'financ':65 'gate':79 'header':124 'http':75 'infer':64 'json-response' 'key':108 'limit':111 'liquid':2,16,35,178 'live':190 'lowpaymentfee.com':32 'mime':133 'minim':154 'network':91 'offer':55 'openapi':166 'page':149 'paramet':183 'part':44 'pay':8,22,51,115 'pay-per-cal':7,21 'pay-per-request':50 'payment':83,123,129 'per':9,23,52,95,116 'polkadot':40 'post':76 'price':92,146 'prompt':157 'proof':130 'proper':193 'protocol':84 'provid':33,59,142 'qualiti':200 'rate':110 'readm':148 'request':53,96,117 'request/response':169 'resolv':151 'respons':132,202 'return':180,191 'schema':167 'servic':69 'settl':85 'span':60 'spars':140 'structur':203 'suit':48 'technic':161 'token':41 'type':134 'unit':100 'unknown':205 'usdc':14,28,87,102 'usdc-base-network' 'util':68 'valid':127 'via':6,20,74 'wallet':156 'x':122 'x-payment':121 'x402':11,25,82,128 'x402-payment'","prices":[{"id":"0d81a32a-5594-4278-b92f-bd83cf7b5118","listingId":"c0745dea-1f57-4ff9-aa6e-478988073c6d","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/DOT/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":"2026-04-18T18:37:14.303Z"}],"sources":[{"listingId":"c0745dea-1f57-4ff9-aa6e-478988073c6d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/DOT/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:14.303Z","lastSeenAt":"2026-04-22T21:30:31.803Z"}],"details":{"listingId":"c0745dea-1f57-4ff9-aa6e-478988073c6d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/DOT/liquidity \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/defi/DOT/liquidity"},{"claim":"Provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/DOT/liquidity"}],"useCases":["Querying current DeFi liquidity metrics for DOT/Polkadot","Monitoring DOT liquidity pool depth for trading strategies","Integrating DOT liquidity data into automated DeFi dashboards"],"bestFor":["Agents needing on-demand DOT liquidity data without API key signup","Developers building DeFi dashboards that include Polkadot ecosystem data","Automated trading bots that need per-call liquidity snapshots"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-frequency use cases where $0.02/request cost adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.503Z"},"updatedAt":"2026-04-22T21:30:31.803Z"}}