{"id":"20c6eec9-8057-44ab-9d0a-ecbb92407225","shortId":"M6p4F5","kind":"x402","title":"CRV liquidity data via x402 micropayment on Base for $0.02 per request","tagline":"CRV liquidity data via x402 micropayment on Base for $0.02 per request","description":"This endpoint provides DeFi liquidity data for the CRV (Curve DAO) token, accessible via the x402 payment protocol on the Base network. It is part of a broader API platform at lowpaymentfee.com that offers data & analytics, AI/ML, finance/Web3, and infrastructure endpoints, all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The x402 challenge is live and returns a proper 402 Payment Required response. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific request body schema and response format for the CRV liquidity endpoint are not documented anywhere in the crawled material, so the exact fields returned (e.g., pool TVL, volume, APY, token reserves) must be inferred from the endpoint path and DeFi conventions. Use with the understanding that input/output schemas are unknown.","tags":[],"capabilities":["defi-liquidity-data","crv-curve-dao","x402-micropayment","usdc-base-settlement","per-request-pricing","no-api-key","json-response"],"categories":["defi","finance","crypto"],"synonyms":["Curve DAO liquidity","CRV liquidity API","DeFi liquidity endpoint","Curve pool data","CRV DeFi data","crypto liquidity API","x402 DeFi"],"warnings":["No request body schema documented — input format is unknown","No response schema or example response available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific DeFi data fields returned by this endpoint are entirely unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/CRV/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/CRV/liquidity","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the request body, response schema, or what specific liquidity data is returned. Docs pages are empty beyond a wallet connect prompt. This is effectively a stub listing with a confirmed live payment 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'000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':105 '300':140 '402':125 '6':114 'CRV DeFi data' 'CRV liquidity API' 'Curve DAO liquidity' 'Curve pool data' 'DeFi liquidity endpoint' 'accept':85 'access':37 'address':134 'ai/ml':61 'amount':103 'analyt':60 'anywher':180 'api':53,74,148,194 'base':8,20,45,97,107 'bodi':167 'broader':52 'challeng':118 'commit':81 'connect':157 'content':163 'contract':98 'convent':206 'crawl':183 'crv':1,13,33,174 'crv-curve-dao' 'crypto liquidity API' 'curv':34 'dao':35 'data':3,15,30,59 'decim':115 'defi':28,205 'defi-liquidity-data' 'doc':147 'document':142,179 'e.g':190 'endpoint':26,65,84,176,202 'equal':110 'exact':187 'extrem':144 'field':188 'finance/web3':62 'format':171 'infer':199 'infrastructur':64 'input/output':212 'json':90 'json-response' 'key':75 'limit':78 'liquid':2,14,29,175 'live':120 'lowpaymentfee.com':56 'materi':184 'maximum':102 'micropay':6,18 'must':197 'network':46 'no-api-key' 'offer':58 'page':152 'part':49 'path':203 'payment':41,91,126,130 'per':11,23,70 'per-request-pricing' 'platform':54 'pool':191 'post':86 'price':67,149 'prompt':159 'proper':124 'protocol':42 'provid':27 'rate':77 'readm':151 'render':154 'request':12,24,71,87,166 'requir':82,127 'reserv':196 'respons':128,170 'return':89,122,189 'schema':168,213 'second':141 'sent':132 'settl':93 'spars':145 'specif':165 'timeout':138 'token':36,195 'tvl':192 'understand':210 'unit':108 'unknown':215 'usdc':95,112 'usdc-base-settlement' 'use':113,207 'via':4,16,38 'volum':193 'wallet':158 'x402':5,17,40,117 'x402 DeFi' 'x402-micropayment'","prices":[{"id":"e64c18d5-4798-4904-b331-8ef9d2e9b2fd","listingId":"20c6eec9-8057-44ab-9d0a-ecbb92407225","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/CRV/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":"2026-04-18T18:37:45.227Z"}],"sources":[{"listingId":"20c6eec9-8057-44ab-9d0a-ecbb92407225","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/CRV/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:45.227Z","lastSeenAt":"2026-04-22T20:00:36.675Z"}],"details":{"listingId":"20c6eec9-8057-44ab-9d0a-ecbb92407225","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/CRV/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/defi/CRV/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/CRV/liquidity"}],"useCases":["Querying real-time CRV liquidity pool metrics for trading decisions","Monitoring Curve DAO liquidity depth from automated agents","Integrating CRV liquidity data into DeFi dashboards or bots","Pay-per-call access to DeFi data without managing API keys"],"bestFor":["AI agents needing on-demand CRV liquidity data with micropayments","DeFi developers building Curve-related analytics tools","Low-volume consumers who want pay-per-use without subscriptions"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing comprehensive multi-protocol DeFi data in a single call","Anyone requiring detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.051Z"},"updatedAt":"2026-04-22T20:00:36.675Z"}}