{"id":"44a44be3-1163-4ea5-8499-60b0dffcef3f","shortId":"gvzTza","kind":"x402","title":"API3 DeFi liquidity data via x402 micropayment on Base, $0.02/request in USDC.","tagline":"API3 DeFi liquidity data via x402 micropayment on Base, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides DeFi liquidity data related to API3, accessible via the x402 payment protocol. It accepts POST requests and charges $0.02 per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required — payment is handled inline via the x402 X-PAYMENT header.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request and settled in USDC on Base. This specific endpoint sits under the Finance & Web3 category and appears to serve API3 protocol liquidity information, though the exact response schema is not documented. The x402 challenge confirms the endpoint is live and returns a 402 Payment Required response with a valid payment challenge (x402Version 1, scheme \"exact\").\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no example request/response, and no description of the data fields returned. The endpoint's purpose is inferred solely from its URL path (`/api/v1/defi/API3/liquidity`) and the provider's general site structure. Prospective users should expect to experiment with the endpoint to discover its actual response format.","tags":[],"capabilities":["x402-payment","defi-liquidity-data","api3-protocol","usdc-base-settlement","pay-per-request","no-api-key"],"categories":["defi","finance"],"synonyms":["API3 liquidity","DeFi liquidity API","API3 DeFi data","crypto liquidity endpoint","x402 DeFi API","Base USDC micropayment API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","No request or response schema documented; actual data fields are unknown.","Endpoint purpose inferred solely from URL path '/api/v1/defi/API3/liquidity' — actual functionality unverified.","The endpoint is not listed on the provider's homepage catalog, which may indicate it is experimental or unlisted."],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/API3/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/API3/liquidity","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 via a valid x402 402 challenge, but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The endpoint's purpose is inferred only from its URL path. This is effectively a stub 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'/request':11,24 '0.02':10,23,50,113 '000':54 '1':168 '20':53 '402':158 '6':66 'API3 DeFi data' 'API3 liquidity' 'Base USDC micropayment API' 'DeFi liquidity API' 'accept':45 'access':38 'actual':239 'ai/ml':103 'analyt':102 'api':69,179 'api3':1,14,37,135 'api3-protocol' 'appear':132 'base':9,22,55,61,121 'broad':92 'call':52,98 'catalog':93 'categori':130 'challeng':149,166 'charg':49 'confirm':150 'connect':185 'content':191 'crypto liquidity endpoint' 'data':4,17,34,101,106,205 'decim':67 'defi':2,15,32 'defi-liquidity-data' 'descript':202 'discov':237 'doc':176 'document':146,171 'endpoint':28,99,124,152,209,235 'exact':141,170 'exampl':198 'expect':230 'experi':232 'extrem':173 'field':206 'financ':128 'finance/web3':105 'format':241 'general':224 'handl':78 'header':86 'host':90 'infer':104,213 'inform':138 'inlin':79 'key':70 'limit':73 'liquid':3,16,33,137 'live':154 'lowpaymentfee.com':30,89 'micropay':7,20 'network':62 'no-api-key' 'openapi':195 'page':180 'path':218 'pay':96 'pay-per-cal':95 'pay-per-request' 'payment':42,76,85,159,165 'per':51,97,114 'post':46 'price':111,177 'prompt':187 'prospect':227 'protocol':43,136 'provid':31,88,222 'purpos':211 'rate':72 'relat':35 'render':182 'request':47,115 'request/response':199 'requir':75,160 'respons':142,161,240 'return':156,207 'schema':143 'scheme':169 'serv':134 'servic':109 'settl':117 'sit':125 'site':225 'sole':214 'span':100 'spars':174 'spec':196 'specif':123 'structur':226 'though':139 'unit':56 'url':217 'usdc':13,26,58,64,119 'usdc-base-settlement' 'user':228 'util':108 'valid':164 'via':5,18,39,80 'wallet':186 'web3':129 'x':84 'x-payment':83 'x402':6,19,41,82,148 'x402 DeFi API' 'x402-payment' 'x402version':167","prices":[{"id":"08aef772-f772-4c37-917a-16103e849039","listingId":"44a44be3-1163-4ea5-8499-60b0dffcef3f","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/API3/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":"2026-04-18T18:36:28.165Z"}],"sources":[{"listingId":"44a44be3-1163-4ea5-8499-60b0dffcef3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/API3/liquidity","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:28.165Z","lastSeenAt":"2026-04-22T21:30:29.813Z"}],"details":{"listingId":"44a44be3-1163-4ea5-8499-60b0dffcef3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/API3/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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/API3/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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/defi/API3/liquidity"}],"useCases":["Querying real-time API3 protocol liquidity metrics for DeFi dashboards","Integrating API3 liquidity data into automated trading or analytics pipelines","Agent-driven DeFi research requiring per-call payment without API key management"],"bestFor":["Developers needing on-demand API3 liquidity data without subscription commitments","AI agents that can settle x402 micropayments on Base","DeFi analytics tools requiring low-cost, keyless API access"],"notFor":["Users who need comprehensive API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.686Z"},"updatedAt":"2026-04-22T21:30:29.813Z"}}