{"id":"b1e7a581-7472-4ebc-b089-30f96dfd4d7a","shortId":"3qpgmN","kind":"x402","title":"Uniswap TVL data via x402 micropayment on Base — $0.02 per request, no API key needed.","tagline":"Uniswap TVL data via x402 micropayment on Base — $0.02 per request, no API key needed.","description":"This endpoint provides Uniswap Total Value Locked (TVL) data through the x402 payment protocol. It is hosted at lowpaymentfee.com, a platform offering a broad catalog of pay-per-call APIs spanning DeFi, analytics, AI/ML, finance, and utility services. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscriptions required — payment is handled inline via the x402 header.\n\nThe specific endpoint `/api/v1/defi/uniswap/tvl` accepts POST requests and returns JSON. Based on the URL path, it likely returns current or historical TVL figures for Uniswap pools or the protocol as a whole. However, no detailed documentation, request schema, or example responses were found in the crawled material; the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.\n\nThe endpoint is confirmed live: it returns a proper 402 challenge with x402 version 1, advertising a maximum cost of 20,000 base units of USDC (0.02 USD) on the Base network, paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is Base-native USDC. Timeout is 300 seconds. No OpenAPI spec, AI plugin manifest, or agents.txt was detected.","tags":[],"capabilities":["defi-tvl","uniswap-data","x402-payment","base-network","usdc-settlement","pay-per-request","json-api"],"categories":["defi","finance"],"synonyms":["uniswap total value locked","uniswap TVL API","DeFi TVL endpoint","uniswap liquidity data","x402 DeFi API","micropayment DeFi data","Base USDC API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.","No request or response schema found; the exact data returned by this endpoint is unknown.","No OpenAPI spec or AI plugin manifest detected.","Endpoint is not listed on the provider's own landing page catalog (the landing page lists finance and DeFi endpoints but not this specific /defi/uniswap/tvl path)."],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/uniswap/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/uniswap/tvl","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page listing, and no example payloads. The docs/pricing/API pages are empty. This is effectively a stub listing with only the payment challenge as 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'0.02':9,24,73,188 '000':183 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':201 '1':176 '20':182 '300':209 '402':171 'Base USDC API' 'DeFi TVL endpoint' 'accept':101 'address':196 'advertis':177 'agents.txt':218 'ai':214 'ai/ml':65 'analyt':64 'api':13,28,61,82,146 'asset':199 'base':8,23,78,107,184,192,204 'base-n':203 'base-network' 'broad':54 'call':60 'catalog':55 'challeng':172 'confirm':165 'connect':155 'content':161 'contract':200 'cost':72,180 'crawl':142 'current':115 'data':3,18,39 'defi':63 'defi-tvl' 'detail':131 'detect':220 'doc':145 'document':132 'endpoint':32,99,163 'exampl':136 'figur':119 'financ':66 'found':139 'handl':91 'header':96 'histor':117 'host':47 'howev':129 'inlin':92 'json':106 'json-api' 'key':14,29,83 'like':113 'limit':85 'live':166 'lock':37 'lowpaymentfee.com':49 'manifest':216 'materi':143 'maximum':179 'micropay':6,21 'micropayment DeFi data' 'nativ':205 'need':15,30 'network':79,193 'offer':52 'openapi':212 'page':150 'paid':194 'path':111 'pay':58 'pay-per-cal':57 'pay-per-request' 'payment':43,89 'per':10,25,59 'platform':51 'plugin':215 'pool':122 'post':102 'price':147 'prompt':157 'proper':170 'protocol':44,125 'provid':33 'rate':84 'readm':149 'render':152 'request':11,26,71,103,133 'requir':88 'respons':137 'return':105,114,168 'schema':134 'second':210 'servic':69 'span':62 'spec':213 'specif':98 'subscript':87 'substant':160 'timeout':207 'total':35 'tvl':2,17,38,118 'uniswap':1,16,34,121 'uniswap TVL API' 'uniswap liquidity data' 'uniswap total value locked' 'uniswap-data' 'unit':185 'url':110 'usd':189 'usdc':75,187,206 'usdc-settlement' 'util':68 'valu':36 'version':175 'via':4,19,93 'wallet':156 'whole':128 'x402':5,20,42,95,174 'x402 DeFi API' 'x402-payment'","prices":[{"id":"af453033-f20d-49c1-894e-9b00d3f722ba","listingId":"b1e7a581-7472-4ebc-b089-30f96dfd4d7a","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/uniswap/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":"2026-04-19T12:29:46.931Z"}],"sources":[{"listingId":"b1e7a581-7472-4ebc-b089-30f96dfd4d7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/uniswap/tvl","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T12:29:46.931Z","lastSeenAt":"2026-04-22T18:32:55.513Z"}],"details":{"listingId":"b1e7a581-7472-4ebc-b089-30f96dfd4d7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/uniswap/tvl \\\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 version 1 challenge, maxAmountRequired 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/defi/uniswap/tvl"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/defi/uniswap/tvl"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a Connect wallet prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current Uniswap TVL for portfolio dashboards","Monitoring DeFi liquidity trends programmatically","Feeding TVL data into trading or analytics agents","Comparing Uniswap TVL across time periods"],"bestFor":["Agents or bots needing on-demand DeFi TVL without API key management","Developers who want pay-per-call pricing with no subscription","Applications already using x402 payment flows on Base"],"notFor":["Users needing detailed Uniswap pool-level analytics (no evidence this endpoint provides that granularity)","High-volume consumers who would benefit from bulk/subscription pricing","Anyone requiring comprehensive API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:23.493Z"},"updatedAt":"2026-04-22T18:32:55.513Z"}}