Agent Skills › sediman-agent/OpenSkynet › venice-x402

venice-x402

GitHub

管理Venice x402钱包信用，支持通过Base链USDC充值、查询余额及交易记录。涵盖支付发现、签名结算流程及402响应处理，最低充值5美元，无需账户即可按请求付费。

skills/veniceai_skills/venice-x402/SKILL.md sediman-agent/OpenSkynet

Trigger Scenarios

用户需要为Venice API充值或支付用户希望查询x402钱包余额或交易历史遇到402 Payment Required错误需解决支付问题

Install

npx skills add sediman-agent/OpenSkynet --skill venice-x402 -g -y

More Options

Non-standard path

npx skills add https://github.com/sediman-agent/OpenSkynet/tree/main/skills/veniceai_skills/venice-x402 -g -y

Use without installing

npx skills use sediman-agent/OpenSkynet@venice-x402

指定 Agent (Claude Code)

npx skills add sediman-agent/OpenSkynet --skill venice-x402 -a claude-code -g -y

安装 repo 全部 skill

npx skills add sediman-agent/OpenSkynet --all -g -y

预览 repo 内 skill

npx skills add sediman-agent/OpenSkynet --list

SKILL.md

Frontmatter

{
    "name": "venice-x402",
    "description": "Manage Venice x402 wallet credits. Covers POST \/x402\/top-up (payment discovery + signed USDC settlement), GET \/x402\/balance\/{walletAddress}, GET \/x402\/transactions\/{walletAddress}, USDC on Base (chain 8453), minimum $5 top-up, transaction types TOP_UP\/CHARGE\/REFUND, and the x402 v2 PAYMENT-REQUIRED response shape returned by all inference endpoints."
}

Venice x402 (wallet credits)

x402 is Venice's wallet-based payment flow. Pay per request with USDC on Base, no account required. Three admin endpoints plus the protocol-level 402 response returned by every inference endpoint.

Endpoint	Auth	Purpose
`POST /x402/top-up`	None (discovery) / `X-402-Payment` (settlement)	Discover payment requirements, then settle a signed USDC transfer.
`GET /x402/balance/{walletAddress}`	SIWE (`X-Sign-In-With-X`)	Current USD balance for a wallet.
`GET /x402/transactions/{walletAddress}`	SIWE	Paginated ledger: `TOP_UP`, `CHARGE`, `REFUND`.

For the SIWE header format itself, see venice-auth.

Pay with a wallet: end-to-end

1. Call an inference endpoint with no balance → `402`

Any inference endpoint (e.g. POST /chat/completions) returns a 402 with structured topUpInstructions and siwxChallenge when the wallet balance is too low. The PAYMENT-REQUIRED response header carries the x402 v2 paymentRequired object (base64-encoded JSON containing x402Version, error, resource, accepts[], and optional extensions) — it is not the same payload as the 402 body, which is a richer balance/top-up document.

{
  "error": "Payment required",
  "code": "PAYMENT_REQUIRED",
  "message": "Insufficient x402 balance",
  "suggestedTopUpUsd": 10,
  "minimumTopUpUsd": 5,
  "supportedTokens": ["USDC"],
  "supportedChains": ["base"],
  "topUpInstructions": {
    "step1": "POST /api/v1/x402/top-up with no payment header to get payment requirements",
    "step2": "Sign a USDC transfer authorization using the x402 SDK (createPaymentHeader)",
    "step3": "POST /api/v1/x402/top-up with the signed X-402-Payment header",
    "receiverWallet": "<RECEIVER_WALLET_ADDRESS>",
    "tokenAddress": "<USDC_TOKEN_ADDRESS>",
    "tokenDecimals": 6,
    "network": "eip155:8453",
    "minimumAmountUsd": 5
  },
  "siwxChallenge": {
    "info": { "domain": "api.venice.ai", "statement": "Sign in to Venice AI", ... },
    "supportedChains": ["eip155:8453"]
  }
}

2. Discover payment requirements — `POST /x402/top-up` (no header)

curl -X POST https://api.venice.ai/api/v1/x402/top-up

Response 402:

{
  "x402Version": 2,
  "accepts": [{
    "protocol": "x402",
    "version": 2,
    "network": "eip155:8453",
    "asset": "<USDC_TOKEN_ADDRESS>",
    "amount": "5000000",          // base units; USDC = 6 decimals → 5 USDC
    "payTo": "<RECEIVER_WALLET_ADDRESS>"
  }]
}

3. Sign a USDC transfer → `POST /x402/top-up` with `X-402-Payment`

The x402 SDK does the EIP-712 USDC transferWithAuthorization signing for you:

npm install x402

import { createPaymentHeader } from 'x402'
import { Wallet } from 'ethers'

const wallet = new Wallet(process.env.WALLET_KEY!)
// 1. Discover
const discover = await fetch(`${base}/x402/top-up`, { method: 'POST' })
const { accepts: [req] } = await discover.json()

// 2. Sign payment for $10 (write your own amount in base units)
const amount = '10000000' // $10
const header = await createPaymentHeader({ ...req, amount }, wallet)

// 3. Settle
const settle = await fetch(`${base}/x402/top-up`, {
  method: 'POST',
  headers: { 'X-402-Payment': header },
})
const { data } = await settle.json()
console.log(data.newBalance, data.amountCredited, data.paymentId)

200 response:

{
  "success": true,
  "data": {
    "walletAddress": "0x...",
    "amountCredited": 10,
    "newBalance": 22.5,
    "paymentId": "payment_01HZ..."
  }
}

4. Call inference again — credits are now debited from the wallet

The venice-x402-client SDK wraps steps 1–4: it catches 402, auto-tops-up to a configured amount, and retries.

`GET /x402/balance/{walletAddress}`

curl "https://api.venice.ai/api/v1/x402/balance/0xYOUR_WALLET" \
  -H "X-Sign-In-With-X: <base64 siwe>"

{
  "success": true,
  "data": {
    "walletAddress": "0x...",
    "balanceUsd": 12.5,
    "canConsume": true,
    "minimumTopUpUsd": 5,
    "suggestedTopUpUsd": 10,
    "diemBalanceUsd": 5.25    // optional — present if the wallet is linked to a Venice account with DIEM
  }
}

The SIWE signer must match the path wallet — 403 otherwise.

`GET /x402/transactions/{walletAddress}`

curl "https://api.venice.ai/api/v1/x402/transactions/0xYOUR_WALLET?limit=50&offset=0" \
  -H "X-Sign-In-With-X: <base64 siwe>"

{
  "success": true,
  "data": {
    "walletAddress": "0x...",
    "currentBalance": 12.35,
    "transactions": [
      {
        "id": "ledger_01H...",
        "amount": -0.15,
        "balanceAfter": 12.35,
        "type": "CHARGE",
        "createdAt": "2026-04-03T12:34:56.000Z",
        "requestId": "chatcmpl-...",
        "modelId": "zai-org-glm-5-1"
      },
      {
        "id": "ledger_01H...",
        "amount": 10,
        "balanceAfter": 12.5,
        "type": "TOP_UP",
        "createdAt": "2026-04-03T12:00:00.000Z",
        "requestId": null,
        "modelId": null
      }
    ],
    "pagination": { "limit": 50, "offset": 0, "hasMore": false }
  }
}

Transaction types

`type`	Sign of `amount`	Meaning
`TOP_UP`	positive	`/x402/top-up` settlement.
`CHARGE`	negative	Inference debit. `requestId` / `modelId` link back to the call.
`REFUND`	positive	Failed request refund or manual adjustment.

Query parameters

`/x402/transactions/{walletAddress}`

Param	Notes
`limit`	1–100. Default 50.
`offset`	Number of entries to skip. Default 0.

Use offset + limit and pagination.hasMore for paging.

Constants

Chain — Base mainnet, chain ID 8453 (eip155:8453).
Token — USDC (6 decimals). Native USDC on Base; not USDbC.
Minimum top-up — $5 by default. A small number of allow-listed wallets (e.g. internal test wallets) may have a lower per-wallet override — always use the minimumTopUpUsd returned in topUpInstructions / /x402/balance rather than hardcoding 5.
x402 SDK — npm install x402 for raw payment header signing, or venice-x402-client for the managed Venice flow.
Receiver wallet + token contract are returned in topUpInstructions; don't hardcode them.

Errors

Code	Meaning
`400`	Below minimum top-up, invalid wallet format, or other validation.
`401`	`X-Sign-In-With-X` header is present but invalid (bad signature, expired, nonce reuse, unsupported chain) — returned as `X402_SIGN_IN_*` error codes.
`402`	Expected discovery response on `/x402/top-up` (no payment header), on `/x402/balance` and `/x402/transactions` when the SIWE header is absent, and on any inference endpoint when the wallet balance is insufficient. Settlement errors use `INVALID_PAYMENT` / `INVALID_PAYMENT_FORMAT` / `INSUFFICIENT_FUNDS` / `EXPIRED_PAYMENT` codes.
`403`	SIWE wallet ≠ path wallet.
`429`	Too many top-ups/balance checks.
`500`	Settlement failure; retry with a fresh nonce.

Gotchas

Use the x402 SDK (npm install x402) for signing. Hand-rolling the EIP-712 transferWithAuthorization is risky — nonce reuse ⇒ INVALID_PAYMENT.
The SIWE signer wallet must match the walletAddress path param on balance / transactions. Separate wallets can't inspect each other.
/x402/top-up is unauthenticated on the discovery call — auth is implicit via the signed X-402-Payment header on settlement.
balanceUsd on /x402/balance is the USDC credit balance only. diemBalanceUsd, when present, is a separate linked-account number — sum them yourself if you need a combined figure.
PAYMENT-REQUIRED (uppercase, hyphens) is the header with base64-encoded x402 paymentRequired object; don't confuse it with the body field code: "PAYMENT_REQUIRED" (which only appears on insufficient-balance bodies, not on auth-style 402s).
On /x402/balance and /x402/transactions, missing the SIWE header returns 402 (not 401). Only a present-but-invalid header returns 401 with a X402_SIGN_IN_* code.
The x402 v2 accepts[].amount is in base units (e.g. "5000000" = 5 USDC). Don't multiply by decimals again.
DIEM, BUNDLED_CREDITS, and Bearer-account USD are independent from wallet credits. For account balance, use venice-billing.

Version History

c9d8953 Current 2026-07-05 20:06

Metadata

Files: 0
Version: c9d8953
Hash: 9f6b920e
Indexed: 2026-07-05 20:06

venice-x402

venice-x402

Trigger Scenarios

Install

SKILL.md

Venice x402 (wallet credits)

Pay with a wallet: end-to-end

1. Call an inference endpoint with no balance → 402

2. Discover payment requirements — POST /x402/top-up (no header)

3. Sign a USDC transfer → POST /x402/top-up with X-402-Payment

4. Call inference again — credits are now debited from the wallet

GET /x402/balance/{walletAddress}

GET /x402/transactions/{walletAddress}

Transaction types

Query parameters

/x402/transactions/{walletAddress}

Constants

Errors

Gotchas

Version History

Same Skill Collection

1. Call an inference endpoint with no balance → `402`

2. Discover payment requirements — `POST /x402/top-up` (no header)

3. Sign a USDC transfer → `POST /x402/top-up` with `X-402-Payment`

`GET /x402/balance/{walletAddress}`

`GET /x402/transactions/{walletAddress}`

`/x402/transactions/{walletAddress}`