Chord: on-chain trading and market data

Chord indexes every DEX swap on six EVM chains from its own tape, prices tokens from those trades, and routes a swap across every venue on a chain through one router contract. With this skill you read that data and prepare swaps carefully. You never sign, never broadcast, never hold funds.

• API: https://api.getchord.xyz (REST, JSON; every path below starts with /v1). Reference: https://getchord.xyz/docs , OpenAPI https://getchord.xyz/docs/openapi.json , docs as MCP (Streamable HTTP) https://getchord.xyz/docs/mcp
• Auth: none for data (60 requests a minute per IP). X-API-Key: $CHORD_API_KEY raises the limit and is required for Ask. A user gets a key by signing in at https://getchord.xyz/ask , then Settings > API Key. Never print, log or echo a key.
• Helper: python3 scripts/chord.py (path relative to this skill's folder, standard library only): token, price, board (these three also take solana), stock, meta-quote, meta-swap, quote, swap-tx, simulate, ask, get. It resolves symbols to addresses, converts amounts exactly, prints compact JSON, and builds an unsigned transaction only behind --user-confirmed. Prefer it; plain curl works too. Always pass limit on list calls and never cut JSON with head -c (a truncated answer is a wrong answer).
• If chord_* MCP tools are in your tool list (the hosted server at https://api.getchord.xyz/v1/mcp) they wrap the same API with the chain as a parameter: chord_chains says what each chain supports, chord_quote and chord_swap_tx go through the meta aggregator on every EVM chain, the rest are reads, plus chord_ask. Every rule below applies to them.

/v1/meta/quote, POST /v1/meta/swap, /v1/quote, POST /v1/swap and /v1/candles work on all seven with chain=<id>. Always pass it: /v1/quote silently defaults to Monad. The zero address means the chain's native gas token (on Arc it is an alias for the 6-decimal USDC predeploy). Solana is read-only data from Chord's tape of 11 venues (no prop AMMs, no order books, so SOL/USDC is understated): no quote, no swap, no /v1/candles; everything is under /v1/chains/solana/* (references/solana.md).