{"id":"eb8d2e77-26db-4a1a-b63d-cc3b4433bbe4","shortId":"a2GeCa","kind":"x402","title":"XMR liquidity data via pay-per-call x402 on Base (USDC, $0.02/request)","tagline":"XMR liquidity data via pay-per-call x402 on Base (USDC, $0.02/request)","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data for Monero (XMR) through a simple HTTP POST call, paid per-request using the x402 protocol. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader catalog hosted at lowpaymentfee.com that spans data analytics, AI/ML inference, finance/Web3 market data, and utility services, all uniformly priced at $0.02 per call. The specific path `/api/v1/defi/XMR/liquidity` is not listed on the provider's landing page among the advertised endpoints, but the x402 challenge is live and returns a well-formed 402 response with an outputSchema indicating a discoverable POST method.\n\nDocumentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and no example payloads. The actual shape of the liquidity data returned after successful payment is unknown from available materials.","tags":[],"capabilities":["defi-liquidity-data","xmr-monero","x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["defi","crypto","finance"],"synonyms":["Monero liquidity","XMR DeFi data","XMR liquidity pool","crypto liquidity API","Monero market depth","DeFi liquidity endpoint","XMR pool data"],"warnings":["This specific endpoint (/api/v1/defi/XMR/liquidity) is not listed among the provider's advertised APIs on the landing page","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content","No request body schema or response schema is available — the data format returned after payment is unknown","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/XMR/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/XMR/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no documentation, no request/response schema, no examples, and this specific endpoint is not even listed on the provider's own landing page. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. Effectively a stub 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'/request':14,28 '0.02':13,27,64,127 '000':70 '20':69 '402':159 '6':74 'DeFi liquidity endpoint' 'Monero liquidity' 'Monero market depth' 'XMR DeFi data' 'XMR liquidity pool' 'XMR pool data' 'actual':212 'addit':191 'advertis':145 'ai/ml':115 'among':143 'analyt':114 'api':77,177 'attach':88 'avail':225 'base':11,25,61,71 'beyond':202 'broader':106 'call':8,22,45,129 'caller':86 'catalog':107 'challeng':150,205 'commit':83 'connect':186 'crypto liquidity API' 'data':3,17,36,113,119,217 'decim':75 'defi':34 'defi-liquidity-data' 'detail':193 'discover':166 'doc':176 'document':169 'endpoint':30,101,146 'exampl':209 'extrem':171 'finance/web3':117 'form':158 'header':93 'host':108 'http':43 'http-post' 'indic':164 'infer':116 'key':78 'land':141 'limit':80 'liquid':2,16,35,216 'list':136 'live':152 'lowpaymentfee.com':32,110 'market':118 'materi':226 'maxamountrequir':67 'metadata':206 'method':168 'monero':38 'network':62 'no-api-key' 'openapi':197 'outputschema':163 'page':142,181 'paid':46 'part':103 'path':132 'pay':6,20 'pay-per-cal':5,19 'pay-per-request' 'payload':210 'payment':54,92,98,221 'per':7,21,48,65,128 'per-request':47 'post':44,167 'price':125,178 'prompt':188 'proof':99 'protocol':53 'provid':33,139,174 'rate':79 'readm':180 'render':183 'request':49,66 'request/response':200 'requir':85 'respons':160 'return':154,218 'schema':201 'servic':122 'settl':56 'shape':213 'simpl':42 'simpli':87 'span':112 'spars':172 'spec':198 'specif':131 'success':220 'technic':192 'uniform':124 'unit':72 'unknown':223 'upfront':82 'usdc':12,26,58 'usdc-base-network' 'use':50 'util':121 'valid':96 'via':4,18 'wallet':187 'well':157 'well-form':156 'x':91 'x-payment':90 'x402':9,23,52,97,149,204 'x402-payment' 'xmr':1,15,39 'xmr-monero'","prices":[{"id":"46a40aa3-da85-499d-b7c8-6292eec146b2","listingId":"eb8d2e77-26db-4a1a-b63d-cc3b4433bbe4","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/XMR/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":"2026-04-18T18:34:23.311Z"}],"sources":[{"listingId":"eb8d2e77-26db-4a1a-b63d-cc3b4433bbe4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/XMR/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:23.311Z","lastSeenAt":"2026-04-23T00:31:02.287Z"}],"details":{"listingId":"eb8d2e77-26db-4a1a-b63d-cc3b4433bbe4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/XMR/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":"The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/XMR/liquidity"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages all show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time XMR liquidity across DeFi protocols","Building trading bots that need Monero liquidity snapshots","Monitoring DeFi pool depth for XMR pairs","Integrating XMR liquidity checks into portfolio dashboards"],"bestFor":["Agents or bots needing on-demand XMR liquidity data without API key management","Developers prototyping DeFi dashboards who want instant pay-per-call access","Automated trading systems that need low-friction crypto data endpoints"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before integrating","High-volume consumers who would benefit from subscription-based bulk pricing","Anyone needing historical XMR liquidity time-series (no evidence this is supported)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:01:18.39Z"},"updatedAt":"2026-04-23T00:31:02.287Z"}}