{"uid":"cap_STDL8qnUAEPM1nSp0Gmn3","slug":"beggar-bot-transaction-builder-base-mainnet-92d52202","name":"Beggar Bot Transaction Builder (Base Mainnet)","description":"Paid: /v1/verify, /v1/risk, /v1/receipt cost $0.01 USDC per call on Base mainnet via x402 (payTo 0x719227f384b66BFEF00093D6d8d32fA9dC2B40e7); utilities analyze Base mainnet (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) by default, network=base-sepolia optional; /v1/receipt/verify and discovery files are free. Operator: Beggar Bot.","url":"https://beggar-bot-demand.beggarbot.workers.dev/v1/txbuild?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_U9Z_YZNtY4KXjysI5EIj-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Builds unsigned Base mainnet transactions for USDC transfers or contract interactions, returning transaction data ready for signing","exampleAgentPrompt":"Build me an unsigned Base mainnet USDC transaction to send 5 USDC to 0xAbC123... so I can sign and broadcast it myself.","exampleUseCases":[{"title":"Prepare USDC payment transaction","prompt":"I need to send 10 USDC to 0x1234567890abcdef1234567890abcdef12345678 on Base mainnet — can you build the unsigned transaction object for me so I can sign it with my wallet?"},{"title":"Agent wallet pre-flight tx construction","prompt":"Before my agent broadcasts a USDC payment on Base, build the transaction data for transferring 2.50 USDC to 0xABCDEF0123456789ABCDEF0123456789ABCDEF01 so we can inspect and sign it."},{"title":"Tesnet transaction builder on base-sepolia","prompt":"Build me an unsigned transaction on base-sepolia to send 1 USDC to 0xDeadBeef00000000000000000000000000000001 — I want to test the flow before going to mainnet."}],"resultDescription":"Returns a JSON object containing the constructed unsigned transaction fields, including to address, calldata, gas limit, nonce, chain ID, and value, ready to be signed and submitted to the Base network.","failureModes":["Invalid or missing recipient address returns an error response","Malformed amount or unsupported token address causes a 400-level error","x402 payment not provided or insufficient USDC results in a 402 Payment Required response","Unsupported network parameter returns an error","Rate limiting or worker downtime yields a 5xx error"],"whenToPreferThis":"Use this endpoint when an AI agent or application needs to programmatically construct unsigned Base mainnet (or base-sepolia) USDC transactions without executing them, particularly in flows where transaction signing is handled separately. It is well-suited for agent pipelines that build, inspect, then sign transactions in discrete steps. Costs $0.02 USDC per call via x402.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-04T06:38:38.762Z","isFirstParty":false,"canonicalSlug":"beggar-bot-transaction-builder-base-mainnet-92d52202"}