Coil Market Data API

openapi: 3.2.0
info:
  title: Coil Agent Market Data API
  version: 1.2.0
  description: 'A trading desk''s discipline for your AI agent: when to trade, when to wait and when to sit in cash, plus the scores to act on. Market data and trading signals for AI agents, paid per call in USDC — no account, no API key, no signup. New here? Start with GET /api/crypto/gate — $0.001, the cheapest answer we sell and the most common first call: is crypto risk-on right now. Paid endpoints run from $0.001 to $0.25 per read, plus the published research studies (free index: GET /api/research), plus a $0.25 one-hour Coil Live session: market regime verdicts, 0-100 opportunity / entry-timing / hold-strength scores per name, ranked buy lists, sector and macro rotation, day-trade state maps, per-symbol hold state, a point-in-time archive, and a 24/7 crypto board — across 650+ names (S&P 500, Nasdaq-100, macro ETFs) and 81 Robinhood-tradable crypto pairs. Equities re-score about every 5 minutes through the US market day; crypto runs around the clock. Every response is timestamped (computed_at) and carries an on-chain settlement receipt.


    FREE FIRST, no payment and no key: a live top-3 preview per book (/api/board/agent?preview=1, identical schema), a sample of the board (top 3 per book, headline fields) one market day delayed over MCP (claude mcp add --transport http coil https://mcp.coil.trade/mcp), one complete committed day from the append-only log, our own forward-return audit (/api/board/signal-audit) and a sha256 commitment log (/api/board/proof). A free key or a wallet sign-in (SIWX) unlocks ~25 live calls/day on the cheap reads.


    Impersonal research publication — identical for every buyer, not individualized investment advice; scores describe historical and technical structure, not future returns. Markets can lose money; crypto is highly volatile and can lose value rapidly, including total loss.'
  x-guidance: 'The reads follow a trading desk''s routine, top-down: the gate first (is the market worth trading today; on a cash reading nothing new opens), then where money is moving, then the set-ups with their entry windows, then one name before any buy, and the hold state of what you own (a broken trend ends the thesis; exits come before entries). Start here: /api/crypto/gate ($0.001) is the cheapest answer we sell and the most common first call — is crypto risk-on right now, straight from the BTC 200-day master gate. /api/board/regime ($0.005) asks the same question of the equity tape and /api/board/indices ($0.005) gives the index ladder; those two are the usual next calls. Then drill in. If the regime is favorable, /api/board/buylist ($0.05) returns today''s ranked candidates, or /api/board/name?sym=NVDA ($0.005, up to 10 symbols) scores tickers you hold. /api/board/hold?sym= ($0.005) says whether a position''s trend state is intact. /api/crypto/day ($0.005) is the 24/7 board for 81 Robinhood-tradable coins. Call any paid path with no payment header to get HTTP 402 carrying BOTH x402 v2 requirements (also base64 in PAYMENT-REQUIRED) and an MPP ''WWW-Authenticate: Payment'' challenge; pay on Base, Solana or Algorand and the same request returns JSON plus an on-chain receipt. 402 amounts are atomic units (USDC 6dp: $0.005 = "5000"); OpenAPI price.amount is decimal USD. Free first: ?preview=1, the delayed MCP server, /api/board/signal-audit, /api/board/proof; poll /api/board/state (free) and buy only when its hash moves. Rank by opp_pct; read the book regime before acting on any name score. BEHAVIOUR LAYER: when to call, when to come back and when to STOP is the skill at https://coil.trade/skills/coil-board/SKILL.md (an agent reading only this spec never saw it before). ALGORAND FEES ARE SPONSORED: both Algorand rails carry a feePayer, so you need zero ALGO to pay — Base and Solana require gas tokens. That rail is easiest for a wallet holding only USDC.'
  contact:
    email: support@coil.trade
    url: https://coil.trade/agents
  x-polling-contract: Every response (paid AND the free preview) carries a freshness block — market_open, data_age_seconds, next_refresh_at, and a plain-language poll_hint — plus the same values in the X-Coil-Market-Open / X-Coil-Next-Refresh / X-Coil-Data-Age response headers. It tells you when the board will actually change, so you poll only when there is new data instead of re-buying an identical payload. When the US market is shut it says so and gives the next session time. Market holidays are not modelled (a holiday reads as open while the board simply will not advance — data_age_seconds still reveals it).
servers:
- url: https://coil.trade
tags:


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# Full source: https://artifacts.apis.io/coil-trade/openapi/coil-trade-market-data-api-openapi.yml