x402 Payment Protocol for TRON Agents

Invoke x402-enabled AI agent endpoints with automatic TRC20 token payments on TRON. Currently recommended tokens: USDT, USDD.

Quick Start

The tool

x402_tron_invoke

is implemented by the compiled script

dist/x402_tron_invoke.js

The script is pre-built and ready to run. You can execute it directly from the command line:

# v2 Invoke
node dist/x402_tron_invoke.js --url https://api.example.com --entrypoint chat --input '{"prompt": "hi"}'
Direct/Discovery

node dist/x402_tron_invoke.js --url https://api.example.com/.well-known/agent.json

How It Works

The

x402_tron_invoke

tool:

Constructs the endpoint URL:
- If
```
entrypoint
```
  is provided:
```
{url}/entrypoints/{entrypoint}/invoke
```
  (v2)
- Otherwise: Uses
```
{url}
```
  as-is (v1 / Discovery)
Makes a request (POST for v2, GET default for v1)
If 402 Payment Required is returned:
- Parses payment requirements
- Checks wallet balance and allowance
- Performs an infinite approval if allowance is insufficient
- Signs the payment permit (EIP-712 / TRON Typed Data)
- Retries the request with
```
X-PAYMENT
```
  header
Returns the response

Prerequisites

Wallet: A TRON private key must be available. The skill automatically looks for it in:
1. ```
TRON_PRIVATE_KEY
```
  environment variable.
2. ```
~/.mcporter/mcporter.json
```
  (AIBank standard).
3. ```
x402-config.json
```
  in the current/home directory.
Tokens: Wallet needs USDT/USDD and some TRX for gas.
TronGrid API Key: Required for Mainnet to avoid rate limits (
```
TRON_GRID_API_KEY
```
).

Tool Reference

x402_tron_invoke

Invokes an HTTP endpoint with automatic payment handling.

Modes:

v2 Agent Invoke (Recommended): Provide
```
url
```
(Base URL) +
```
entrypoint
```
.
- Constructs:
```
{url}/entrypoints/{entrypoint}/invoke
```
- Wraps input:
```
{"input": <input>}
```
- Method:
```
POST
```
v1 / Direct / Discovery: Provide
```
url
```
(Full URL) without
```
entrypoint
```
.
- Uses the URL as-is.
- Method:
```
GET
```
  (default) or specified via
```
method
```
  .
- Agent Advice: Use this mode for discovery. If
```
url
```
  returns 404, try appending
```
/.well-known/agent.json
```
  or
```
/entrypoints
```
  .
Status Check: Provide
```
--check
```
or
```
--status
```
.
- Verifies if
```
TRON_PRIVATE_KEY
```
  is correctly configured and outputs the associated wallet address.
- Checks if
```
TRON_GRID_API_KEY
```
  is present (Required for Mainnet).
- Agent Advice: ALWAYS use this instead of
```
env
```
  or
```
echo $TRON_PRIVATE_KEY
```
  .

Parameter	Type	Required	Description
`url`	string	Yes*	Base URL (v2) or Full URL (v1/Discovery). *Not required for `--check` .
`entrypoint`	string	No	Entrypoint name. Required for v2 Invoke.
`input`	object	No	Input data.
`method`	string	No	HTTP method. Default: `POST` (v2), `GET` (Direct).
`network`	string	No	`mainnet` , `nile` , `shasta` (Default: `nile` ).
`check`	boolean	No	Verify wallet configuration and output address.

Example: Chat with Agent (v2 Invoke)

node dist/x402_tron_invoke.js --url https://api.example.com --entrypoint chat --input '{"prompt": "Tell me a joke"}'

(Sends

POST https://api.example.com/entrypoints/chat/invoke

)

Example: Agent Discovery (Direct)

Manifest: Fetch agent metadata.

node dist/x402_tron_invoke.js --url https://api.example.com/.well-known/agent.json

List Entrypoints: List available functions.

node dist/x402_tron_invoke.js --url https://api.example.com/entrypoints

Each entrypoint typically returns:

Path:
```
/entrypoints/{name}/invoke
```
Pricing: Cost in tokens (e.g., 1000 units)
Network: Usually
```
nile
```
or
```
mainnet
```
Input Schema: Expected JSON format for the
```
input
```
parameter

Example: Raw URL (Legacy)

node dist/x402_tron_invoke.js --url https://api.example.com/chat --method POST --input '{"prompt": "Tell me a joke"}'

Cost Reference (USDT/USDD)

Token	Network	Contract Address	Decimals
USDT	Mainnet	`TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t`	6
USDT	Nile	`TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf`	6
USDT	Shasta	`TG3XXyExBkPp9nzdajDZsozEu4BkaSJozs`	6
USDD	Mainnet	`TXDk8mbtRbXeYuMNS83CfKPaYYT8XWv9Hz`	18
USDD	Nile	`TGjgvdTWWrybVLaVeFqSyVqJQWjxqRYbaK`	18

Amount (raw)	Value (USDT, 6 dec)	Typical Use
1000	$0.001	Single API call
5000	$0.005	Multiple results
10000	$0.01	Premium request
1000000	$1.00	Large batch

Understanding 402 Responses

When payment is required, agents return:

{
  "error": "X-PAYMENT header is required",
  "accepts": [{
    "scheme": "exact",
    "network": "nile",
    "maxAmountRequired": "1000",
    "payTo": "T...",
    "asset": "T..."
  }],
  "x402Version": 1
}

The tool handles this automatically.

Supported Tokens

This tool supports TRC20 tokens compatible with the x402 protocol. Recommended:

USDT (Tether)
USDD (Decentralized USD)

Security Rules for Agents

No Private Key Output: The Agent MUST NOT print, echo, or output the
```
TRON_PRIVATE_KEY
```
or any other signing secret to the dialogue context.
Internal Loading Only: The Agent should rely on the skill or underlying scripts to load the key internally.
No Export Commands: The Agent MUST NOT execute shell commands that contain the private key as a literal string.
Sanitized Logs: Ensure that logs or error messages do not leak the key.
Silent Environment Checks: If you need to verify if an environment variable is set, use a "Silent Check".
- Correct:
```
[[ -n $TRON_PRIVATE_KEY ]] && echo "Configured" || echo "Missing"
```
- Forbidden:
```
echo $TRON_PRIVATE_KEY
```
  ,
```
env
```
  ,
```
printenv
```
  ,
```
set
```
  ,
```
export
```
  .
Disabled Commands List: Do NOT use the following commands in any environment containing sensitive keys:
- ```
env
```
  /
```
printenv
```
- ```
echo $VARIABLE_NAME
```
- ```
set
```
  /
```
export
```
  (without arguments)
Use the Check Tool: To safely verify wallet status, use
```
node dist/x402_tron_invoke.js --check
```
.

❌ Negative Example (CRITICAL FAILURE)

"I will check your private key now:
echo $TRON_PRIVATE_KEY
" -> STOP! This leaks the secret to the logs and UI.

✅ Positive Example

"I will verify the wallet configuration:
node dist/x402_tron_invoke.js --check
" -> SAFE. Only the public address is shown.

Troubleshooting

"Private key not found"

Ensure the

TRON_PRIVATE_KEY

environment variable is set or a valid

x402-config.json

exists in the expected locations.

"Insufficient Allowance"

The tool will attempt to broadcast an infinite approve transaction. This requires TRX for gas. Ensure your wallet has TRX.

"Transaction Failed"

Check if you have enough Token balance (USDT/USDD) and TRX for gas.

Binary and Image Handling

If the endpoint returns an image (Content-Type:

image/*

) or binary data (

application/octet-stream

The data is automatically saved to a temporary file (e.g.,
```
/tmp/x402_image_...
```
).
The tool returns a JSON object with:
- ```
file_path
```
  : Path to the temporary file.
- ```
content_type
```
  : The MIME type of the content.
- ```
bytes
```
  : File size in bytes.
Important: The Agent is responsible for deleting the temporary file after it has been used.

Network Reference

Network Chain ID CAIP-2 USDT Contract USDD Contract

TRON Mainnet

0x2b6653dc

eip155:728126428

tron:mainnet

TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t

TXDk8mbtRbXeYuMNS83CfKPaYYT8XWv9Hz

TRON Nile

0xcd8690dc

eip155:3448148188

tron:nile

TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf

TGjgvdTWWrybVLaVeFqSyVqJQWjxqRYbaK

TRON Shasta

0x94a9059e

eip155:2494104990

tron:shasta

TG3XXyExBkPp9nzdajDZsozEu4BkaSJozs

tron-x402-payment

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x402 Payment Protocol for TRON Agents

Quick Start

Direct/Discovery

How It Works

Prerequisites

Tool Reference

x402_tron_invoke

Example: Chat with Agent (v2 Invoke)

Example: Agent Discovery (Direct)

Example: Raw URL (Legacy)

Cost Reference (USDT/USDD)

Understanding 402 Responses

Supported Tokens

Security Rules for Agents

❌ Negative Example (CRITICAL FAILURE)

✅ Positive Example

Troubleshooting

"Private key not found"

"Insufficient Allowance"

"Transaction Failed"

Binary and Image Handling

Network Reference

Quick Start

Manual Installation

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