{"id":"c2621460-6d45-4f69-88e3-ef200f241451","shortId":"Lhpg4g","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request","tagline":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 58. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/58/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The x402 challenge was successfully captured, confirming the endpoint is live. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation is extremely sparse. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint appears to be part of a finance/Web3 category based on its URL structure, but the exact data returned (token balances, asset allocations, historical holdings, etc.) is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","web3"],"synonyms":["portfolio holdings API","investment holdings","asset allocation","portfolio data","crypto portfolio","holdings endpoint","x402 finance API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request body schema or response schema provided; integration requires trial and error","Endpoint is hardcoded to portfolio ID 58 — unclear if other portfolio IDs are accessible or what this portfolio represents","The broader lowpaymentfee.com platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/58/holdings","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/portfolios/58/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the endpoint is scoped to a single hardcoded portfolio ID (58) with no explanation of what data it returns or what POST body it 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'/request':12,24 '0.02':11,23,111 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':105 '58':36 '6':114 'accept':82,192 'access':135 'addit':165 'advertis':134 'ai/ml':58 'alloc':216 'analyt':57 'api':53,128,152 'appear':195 'asset':215 'asset allocation' 'avail':223 'balanc':214 'base':8,20,74,97,107,203 'behind':67 'bodi':191 'broader':42 'call':52 'captur':121 'categori':202 'chain':93 'challeng':118 'confirm':122 'connect':160 'contain':185 'contract':98 'cost':103 'crawl':149 'crypto portfolio' 'data':3,15,32,56,61,211 'decim':115 'descript':178 'detail':167 'doc':150 'document':144 'dozen':47 'endpoint':26,54,80,124,194 'equal':110 'etc':219 'exact':210 'exampl':175 'extrem':146 'field':181 'finance/web3':60,201 'gate':66 'grant':137 'histor':217 'hold':2,14,31,183,218 'holdings endpoint' 'id':35 'infer':59 'investment holdings' 'json':87 'json-response' 'key':129 'limit':132 'live':126 'lowpaymentfee.com':28,44 'materi':224 'maximum':102 'micropay':6,18,143 'network':9,21,75 'no-api-key' 'offer':46 'on-chain':91 'openapi':171 'page':155 'paramet':188 'part':39,198 'pay':50 'pay-per-cal':49 'pay-per-request' 'payment':70,88 'per':51,141 'per-request':140 'platform':43 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':83,190 'price':151 'prompt':162 'protocol':71 'pure':138 'rate':131 'readm':154 'request':84,142 'request/response':174 'respons':184 'return':29,86,157,212 'schema':172 'servic':64 'settl':90 'span':55 'spars':147 'specif':79 'structur':207 'success':120 'technic':166 'token':213 'unit':108 'unknown':221 'url':206 'usdc':77,95,112 'usdc-base' 'use':76,113 'util':63 'via':4,16,94 'wallet':161 'x402':5,17,69,117 'x402 finance API' 'x402-payment'","prices":[{"id":"2d1286d5-4631-48c7-b0bd-3656391a57dd","listingId":"c2621460-6d45-4f69-88e3-ef200f241451","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/portfolios/58/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:00.766Z"}],"sources":[{"listingId":"c2621460-6d45-4f69-88e3-ef200f241451","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/58/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:00.766Z","lastSeenAt":"2026-04-23T02:01:26.560Z"}],"details":{"listingId":"c2621460-6d45-4f69-88e3-ef200f241451","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/58/holdings \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/58/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/58/holdings"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages return only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve holdings data for a specific portfolio via micropayment","Integrate portfolio data into trading bots or dashboards without API key management","Agent-driven portfolio analysis with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that need on-demand financial holdings information","Applications requiring low-friction API access without subscriptions"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume bulk data retrieval where per-request pricing adds up","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 58)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.593Z"},"updatedAt":"2026-04-23T02:01:26.560Z"}}