{"uid":"cap_8EjLNJZ6PRFztZAY4C_mn","slug":"coin-railz-portfolio-tracker-5bfebc9f","name":"Coin Railz Portfolio Tracker","description":"Real-time multi-chain portfolio valuation - infrastructure for portfolio management agents (B2B2C infrastructure)","url":"https://coinrailz.com/x402/service/portfolio-tracker","method":"POST","headers":{},"bodySchema":{"type":"object","required":["walletAddress"],"properties":{"chains":{"type":"array","description":"Chains to track (default: ethereum, base, polygon)"},"walletAddress":{"type":"string","description":"Wallet address to track"}}},"responseSchema":{"type":"object","properties":{"holdings":{"type":"array","description":"Token holdings across chains"},"totalValueUsd":{"type":"number","description":"Total portfolio value in USD"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.5","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.5/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qMfGCA92jSNX0Yipq-Ewy","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.5","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns real-time token holdings and total USD value for a wallet address across multiple EVM chains","exampleAgentPrompt":"What's the total USD value of my crypto portfolio for wallet 0xAbCd1234...5678 — check across Ethereum, Base, and Polygon and list all my token holdings?","exampleUseCases":[{"title":"Track agent portfolio value updates","prompt":"Can you check my wallet holdings on Ethereum, Base, and Polygon right now and tell me what my total portfolio is worth in USD? I want to see all the tokens I'm holding and their current values."},{"title":"Monitor multi-chain DeFi position risk","prompt":"Show me the real-time USD value of all my tokens across Ethereum and Polygon — I need to see my complete portfolio snapshot to decide if I should rebalance my positions."},{"title":"Reconcile portfolio across exchanges","prompt":"I just moved some tokens around — can you pull my current holdings across Base, Polygon, and Ethereum and give me the total value in dollars so I know exactly what I have across all chains?"}],"resultDescription":"Returns an array of token holdings across the specified chains (including token name, amount, and chain) plus a totalValueUsd number representing the aggregate portfolio value in US dollars.","failureModes":["Invalid or malformed wallet address returns an error","Unsupported chain name in the chains array causes a validation error","Wallet with no holdings returns empty holdings array and zero totalValueUsd","Network or RPC timeout for a specific chain may return partial results","Payment failure (insufficient USDC) blocks the request entirely"],"whenToPreferThis":"Use this endpoint when you need a real-time, multi-chain snapshot of a wallet's token portfolio value in USD — especially when supporting portfolio management agents that need to aggregate holdings across Ethereum, Base, Polygon, and other EVM chains in a single call. Prefer over single-chain balance endpoints when cross-chain aggregation is needed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:48:05.282Z","isFirstParty":false}