{"id":"6586b359-3808-4508-9a56-bd311d1d0aa2","shortId":"2qjYFg","kind":"x402","title":"Yearn Finance TVL data via x402 micropayment on Base for $0.02/request","tagline":"Yearn Finance TVL data via x402 micropayment on Base for $0.02/request","description":"This endpoint returns Yearn Finance Total Value Locked (TVL) data, accessible through the x402 payment protocol on the Base network. It is one of many endpoints offered by lowpaymentfee.com, a platform that provides pay-per-request APIs spanning DeFi data, analytics, AI/ML inference, finance, and utility services — all gated behind x402 micropayments settled in USDC on Base.\n\nThe specific endpoint at `/api/v1/defi/yearn/tvl` accepts POST requests and returns JSON. Each call costs 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made via the x402 `X-PAYMENT` header using the \"exact\" scheme. No API keys or accounts are required; callers simply attach a valid x402 payment header to each request.\n\nThe provider's landing page advertises uniform $0.02 pricing across all endpoints, no rate limits, and no minimum commitments. However, no OpenAPI schema, detailed request/response documentation, or usage examples are available from the crawled pages. The exact structure of the TVL response (e.g., whether it includes historical data, per-vault breakdowns, or just an aggregate number) is unknown from the available material.","tags":[],"capabilities":["defi-data","yearn-finance-tvl","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["defi","finance"],"synonyms":["yearn tvl","yearn finance total value locked","defi tvl api","yearn protocol tvl","tvl data endpoint","yearn vaults tvl"],"warnings":["No API documentation or OpenAPI schema available — request and response formats are unknown","The endpoint path suggests Yearn TVL data but no details on data freshness, granularity, or structure are documented","Other crawled pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","This endpoint is not listed on the provider's landing page (only generic categories are shown); it may be undocumented or experimental"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/yearn/tvl","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/yearn/tvl","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the crawled pages beyond the landing page are empty wallet-connect stubs. The actual data returned by this endpoint is entirely 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'/request':12,24 '0.02':11,23,103,149 '000':98 '20':97 '6':108 'accept':88 'access':35 'account':128 'across':151 'advertis':147 'aggreg':197 'ai/ml':67 'analyt':66 'api':62,125 'attach':133 'avail':172,203 'base':9,21,43,82,99 'behind':75 'breakdown':193 'call':95 'caller':131 'commit':160 'cost':96 'crawl':175 'data':4,16,34,65,189 'decim':109 'defi':64 'defi tvl api' 'defi-data' 'detail':165 'document':167 'e.g':184 'endpoint':26,50,85,153 'exact':122,178 'exampl':170 'financ':2,14,29,69 'gate':74 'header':119,138 'histor':188 'howev':161 'includ':187 'infer':68 'json':93 'json-api' 'key':126 'land':145 'limit':156 'lock':32 'lowpaymentfee.com':53 'made':112 'mani':49 'materi':204 'micropay':7,19,77 'minimum':159 'network':44 'number':198 'offer':51 'one':47 'openapi':163 'page':146,176 'pay':59 'pay-per-request':58 'payment':39,110,118,137 'per':60,191 'per-vault':190 'platform':55 'post':89 'price':150 'protocol':40 'provid':57,143 'rate':155 'request':61,90,141 'request/response':166 'requir':130 'respons':183 'return':27,92 'schema':164 'scheme':123 'servic':72 'settl':78 'simpli':132 'sinc':105 'span':63 'specif':84 'structur':179 'total':30 'tvl':3,15,33,182 'tvl data endpoint' 'uniform':148 'unit':100 'unknown':200 'usag':169 'usd':104 'usdc':80,102,106 'usdc-base' 'use':107,120 'util':71 'valid':135 'valu':31 'vault':192 'via':5,17,113 'whether':185 'x':117 'x-payment':116 'x402':6,18,38,76,115,136 'x402-payment' 'yearn':1,13,28 'yearn finance total value locked' 'yearn protocol tvl' 'yearn tvl' 'yearn vaults tvl' 'yearn-finance-tvl'","prices":[{"id":"e910e1b0-d2ae-44e2-9287-0c494f8eee7e","listingId":"6586b359-3808-4508-9a56-bd311d1d0aa2","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/yearn/tvl","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.214Z"}],"sources":[{"listingId":"6586b359-3808-4508-9a56-bd311d1d0aa2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/yearn/tvl","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.214Z","lastSeenAt":"2026-04-22T04:02:47.815Z"}],"details":{"listingId":"6586b359-3808-4508-9a56-bd311d1d0aa2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/yearn/tvl \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","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","source_url":"https://lowpaymentfee.com/api/v1/defi/yearn/tvl"},{"claim":"The provider advertises $0.02/request pricing, no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/yearn/tvl"}],"useCases":["Fetching current Yearn Finance TVL for portfolio dashboards","Monitoring DeFi protocol TVL changes programmatically","Integrating Yearn TVL data into trading or analytics agents","Comparing DeFi protocol TVL across platforms"],"bestFor":["Agents needing on-demand DeFi TVL data without API key management","Developers building DeFi dashboards who prefer pay-per-call pricing","Automated workflows that need Yearn Finance metrics with minimal setup"],"notFor":["High-frequency polling where per-request costs would accumulate significantly","Users who need detailed Yearn vault-level breakdowns (unclear if supported)","Free-tier or bulk-discount data consumers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:45.941Z"},"updatedAt":"2026-04-22T04:02:47.815Z"}}