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Beggar Bot Transaction Builder (Base Mainnet)
x402
Beggar Bot Transaction Builder (Base Mainnet) is a paid API for AI agents from beggar-bot-demand.beggarbot.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-04).
Builds unsigned Base mainnet transactions for USDC transfers or contract interactions, returning transaction data ready for signing
Price / call$0.02
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Prepare USDC payment transaction
“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?”
Agent wallet pre-flight tx construction
“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.”
Tesnet transaction builder on base-sepolia
“Build me an unsigned transaction on base-sepolia to send 1 USDC to 0xDeadBeef00000000000000000000000000000001 — I want to test the flow before going to mainnet.”
Technical details
Endpoint
GEThttps://beggar-bot-demand.beggarbot.workers.dev/v1/txbuild?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json"
}Tags
x402
Reviews
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