# Coin Railz Token Approval Transaction Generator

> Coin Railz Token Approval Transaction Generator is a paid API for AI agents from coinrailz.com, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-15).

Generates ERC-20 token approval transactions required for DeFi agent interactions with smart contracts

## Facts

- Endpoint: POST https://coinrailz.com/x402/approval-manager
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coin-railz-token-approval-transaction-generator-d1ba2bed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uhaOM07Iv1negebr8Z5s0

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability coin-railz-token-approval-transaction-generator-d1ba2bed -d '<json body>'
```

Example prompt: I need to approve my USDC token spending on the Uniswap router contract before executing a swap — generate the token approval transaction for my wallet.

## When to prefer this

Use this endpoint when a DeFi agent needs to programmatically generate ERC-20 token approval transactions before executing swaps, liquidity provisions, or any smart contract interaction requiring token allowances. It is essential B2B2C infrastructure for automated trading bots and AI agents operating in DeFi environments where manual wallet approvals are not feasible.

## Known failure modes

- Invalid token contract address returns error
- Invalid spender contract address returns error
- Insufficient USDC balance for $0.20 service fee
- Malformed wallet address causes transaction generation failure
- Unsupported chain or token standard returns error

## How this service works

Token approval transaction generator - required infrastructure for DeFi agents (B2B2C infrastructure)

## Output

Returns a JSON object with success status, service name ('approval-manager'), a result message, and a UTC timestamp confirming the approval transaction was generated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Query parameter for the service"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "application/json",
 "format": "json",
 "example": {
  "result": "Service executed successfully",
  "service": "approval-manager",
  "success": true,
  "timestamp": "2026-02-07T01:49:56.224Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coin-railz-token-approval-transaction-generator-d1ba2bed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)