P2p

• fiat (e.g., CNY)
• asset (e.g., USDT)
• user intent: buy crypto or sell crypto
• preferred payment method(s)
• target amount (optional but recommended for ad filtering)

Core Concepts

tradeType mapping (avoid ambiguity)

• User wants to buy crypto (pay fiat, receive USDT/BTC) → tradeType=BUY
• User wants to sell crypto (receive fiat, pay USDT/BTC) → tradeType=SELL

Always reflect this mapping in responses when the user’s wording is ambiguous.

Capabilities

Phase 1 — Public Market (No Auth)

• Quote P2P prices
• Search ads
• Compare payment methods
• Filter/Rank ads by limits and merchant indicators

Phase 2 — Personal Orders (Requires API Key)

• List P2P order history
• Filter by trade type / time range
• Provide summary statistics

Security & Privacy Rules

Credentials

• Required env vars:
  • BINANCE_API_KEY (sent as header)
  • BINANCE_SECRET_KEY (used for signing)

Never display full secrets

• API Key: show first 5 + last 4 characters: abc12...z789
• Secret Key: always mask; show only last 5: ***...c123

Permission minimization

• Binance API permissions: Enable Reading only.
• Do NOT request/encourage trading, withdrawal, or modification permissions.

Storage guidance

• Prefer environment injection (session/runtime env vars) over writing to disk.
• Only write to .env if the user explicitly agrees.
• Ensure .env is in .gitignore before saving.

⚠️ CRITICAL: SAPI Signing (Different from Standard Binance API)

Parameter ordering

• DO NOT sort parameters for SAPI requests.
• Keep original insertion order when building the query string.

Example:

# ✅ Correct for SAPI: keep insertion order
params = {"page": 1, "rows": 20, "timestamp": 1710460800000}
query_string = urlencode(params)  # NO sorting

# ❌ Wrong (standard Binance API only): sorted
query_string = urlencode(sorted(params.items()))

Signing details

See: references/authentication.md for:

• RFC 3986 percent-encoding
• HMAC SHA256 signing process
• Required headers (incl. User-Agent)
• SAPI-specific parameter ordering

API Overview

Public Queries (MGS C2C Agent API — No Auth)

Base URL: https://www.binance.com

Parameter notes:

• tradeType: BUY or SELL (treat as case-insensitive)
• limit: 1–20 (default 10)
• tradeMethodIdentifiers: pass as a plain string (not JSON array) — e.g. tradeMethodIdentifiers=BANK or tradeMethodIdentifiers=WECHAT. Values must use the identifier field returned by the trade-methods endpoint (see workflow below). ⚠️ Do NOT use JSON array syntax like ["BANK"] — it will return empty results.

Workflow: Compare Prices by Payment Method

When the user wants to compare prices across payment methods (e.g., "Alipay vs WeChat"), follow this two-step flow:

Step 1 — Call trade-methods to get the correct identifiers for the target fiat:

GET /bapi/c2c/v1/public/c2c/agent/trade-methods?fiat=CNY
→ [{"identifier":"ALIPAY",...}, {"identifier":"WECHAT",...}, {"identifier":"BANK",...}]

Step 2 — Pass the identifier as a plain string into ad-list via tradeMethodIdentifiers, one payment method per request, then compare:

GET /bapi/c2c/v1/public/c2c/agent/ad-list?fiat=CNY&asset=USDT&tradeType=BUY&limit=5&tradeMethodIdentifiers=ALIPAY&tradeMethodIdentifiers=WECHAT

Compare the best price from each result set.

Important: Do not hardcode identifier values like "Alipay" or "BANK". Always call trade-methods first to get the exact identifier strings for the given fiat currency.

Personal Orders (Binance SAPI — Requires Auth)

Base URL: https://api.binance.com

Authentication requirements:

• Header: X-MBX-APIKEY
• Query: timestamp + signature
• Header: User-Agent: binance-wallet/1.0.0 (Skill)

Output Format Guidelines

Price quote

• Show both sides when available (best buy / best sell).
• Use fiat symbol and 2-decimal formatting.

Example:

USDT/CNY (P2P)
- Buy USDT (you buy crypto): ¥7.20
- Sell USDT (you sell crypto): ¥7.18

Ad list

Return Top N items with a stable schema:

1. adNo (ad number / identifier)
2. price (fiat)
3. merchant name
4. completion rate
5. limits
6. payment methods (identifiers)

Avoid generating parameterized external URLs unless the API returns them.

Placing orders (when user requests):

• This skill does NOT support automated order placement.

• When user wants to place an order, provide a direct link to the specific ad using the adNo:

  https://c2c.binance.com/en/adv?code={adNo}
  

  • {adNo}: the ad number/identifier from the ad list result

  Example: https://c2c.binance.com/en/adv?code=123

• This opens the specific ad detail page where user can place order directly with the selected advertisement.

Personal orders

• Time format: YYYY-MM-DD HH:mm (UTC+0) — always display in UTC timezone
• Include: type, asset/fiat, amount, total, status
• Provide a brief summary line (count + totals) when filtering

Time field conversion (for createTime in listUserOrderHistory):

• The createTime field returns a Unix timestamp in milliseconds (13 digits).
• Convert to human-readable format in UTC+0 timezone:

  # Python example
  from datetime import datetime, timezone
  readable_time = datetime.fromtimestamp(createTime / 1000, tz=timezone.utc).strftime('%Y-%m-%d %H:%M (UTC+0)')
  
  # JavaScript example
  const readableTime = new Date(createTime).toISOString().replace('T', ' ').slice(0, 16) + ' (UTC+0)';
  // Or more explicitly:
  const date = new Date(createTime);
  const readableTime = date.getUTCFullYear() + '-' +
    String(date.getUTCMonth() + 1).padStart(2, '0') + '-' +
    String(date.getUTCDate()).padStart(2, '0') + ' ' +
    String(date.getUTCHours()).padStart(2, '0') + ':' +
    String(date.getUTCMinutes()).padStart(2, '0') + ' (UTC+0)';
  

• Always display the converted time to users with timezone info, not the raw timestamp.

Error Handling (User-Facing)

• Invalid API key (-2015): prompt to verify .env / API Management.
• Signature failed (-1022): warn about wrong secret, sorted params, or stale timestamp.
• Timestamp invalid (-1021): advise time sync / regenerate timestamp.
• Rate limit: ask to retry later.

Limitations (By Design)

This skill does NOT:

• Place/cancel orders
• Mark as paid / release coins
• Submit appeals
• Post/modify advertisements
• Expose sensitive order-detail endpoints beyond what’s needed for history/summary

For in-app actions, guide users to the official P2P orders page (only as a general entry point).

Developer Notes

Version Check (First Invocation per Conversation)

On the first invocation of this skill per conversation, call:

• GET /bapi/c2c/v1/public/c2c/agent/check-version?version=1.0.1 (Base: https://www.binance.com)

Behavior:

• If needUpdate=true: show: New version of P2P Skill is available (current: {clientVersion}, latest: {latestVersion}), update recommended.
• Else / on failure: proceed silently.

Client-side operations

• Asset filtering: if API doesn’t support it, fetch then filter locally.
• Aggregations: compute totals client-side when summary endpoint is insufficient.