Coinbase OpenAPI Skill

Coinbase Advanced Trade Skill

Use this skill to run Coinbase Advanced Trade REST operations through uxc + OpenAPI.

Reuse the uxc skill for shared execution, auth, and error-handling guidance.

Prerequisites

• uxc is installed and available in PATH.
• Network access to https://api.coinbase.com.
• Access to the curated OpenAPI schema URL:
  • https://raw.githubusercontent.com/holon-run/uxc/main/skills/coinbase-openapi-skill/references/coinbase-advanced-trade.openapi.json

Scope

This skill covers a curated Coinbase Advanced Trade surface for:

• product and best-bid-ask market reads
• account summary reads
• order create, cancel, and lookup workflows

This skill does not cover:

• Coinbase Exchange APIs
• Coinbase Prime APIs
• Coinbase Derivatives APIs
• wallet or retail app product families outside Advanced Trade

Authentication

Public product endpoints can be read without credentials.

Private account and order endpoints require a Coinbase Advanced Trade bearer JWT. uxc now supports Coinbase's request-scoped JWT flow directly through jwt_bearer_v1, so you can store the API key id and private key in a credential and let uxc mint the short-lived bearer token per request.

Recommended v1 setup:

1. Download or copy the Coinbase API key material:
   • key_id: organizations/{org_id}/apiKeys/{key_id}
   • private_key: Coinbase exports either -----BEGIN EC PRIVATE KEY----- or -----BEGIN PRIVATE KEY-----; uxc accepts both PEM forms for ES256.
2. Store those values in a local credential.
3. Bind the credential to api.coinbase.com with a jwt_bearer_v1 signer.

uxc auth credential set coinbase-advanced-trade \
  --auth-type api_key \
  --field key_id=env:COINBASE_KEY_ID \
  --field private_key=env:COINBASE_PRIVATE_KEY

uxc auth binding add \
  --id coinbase-advanced-trade \
  --host api.coinbase.com \
  --path-prefix /api/v3/brokerage \
  --scheme https \
  --credential coinbase-advanced-trade \
  --signer-json '{"kind":"jwt_bearer_v1","algorithm":"es256","private_key_field":"private_key","header_typ":"JWT","header_kid_field":"key_id","expires_in_seconds":120,"claims":{"static":{"iss":"cdp"},"from_fields":{"sub":"key_id"},"time":{"nbf":"now","exp":"now_plus_ttl"}},"request_claim":{"name":"uri","format":"string","value_template":"{{request.method}} {{request.host}}{{request.path}}"}}' \
  --priority 100

Validate the active mapping when auth looks wrong:

uxc auth binding match https://api.coinbase.com/api/v3/brokerage/accounts

Core Workflow

1. Use the fixed link command by default:

   • command -v coinbase-openapi-cli
   • If missing, create it: uxc link coinbase-openapi-cli https://api.coinbase.com --schema-url https://raw.githubusercontent.com/holon-run/uxc/main/skills/coinbase-openapi-skill/references/coinbase-advanced-trade.openapi.json
   • coinbase-openapi-cli -h

2. Inspect operation help before execution:

   • coinbase-openapi-cli get:/api/v3/brokerage/products -h
   • coinbase-openapi-cli get:/api/v3/brokerage/accounts -h
   • coinbase-openapi-cli post:/api/v3/brokerage/orders -h

3. Prefer product reads before private account or order workflows:

   • coinbase-openapi-cli get:/api/v3/brokerage/products product_type=SPOT limit=20
   • coinbase-openapi-cli get:/api/v3/brokerage/best_bid_ask product_ids=BTC-USD,ETH-USD

4. Treat all order placement and cancellation as high-risk writes.

Operations

• get:/api/v3/brokerage/products
• get:/api/v3/brokerage/products/{product_id}
• get:/api/v3/brokerage/best_bid_ask
• get:/api/v3/brokerage/accounts
• get:/api/v3/brokerage/accounts/{account_uuid}
• post:/api/v3/brokerage/orders
• post:/api/v3/brokerage/orders/batch_cancel
• get:/api/v3/brokerage/orders/historical/{order_id}
• get:/api/v3/brokerage/orders/historical/batch

Guardrails

• Keep automation on the JSON output envelope; do not use --text.
• Parse stable fields first: ok, kind, protocol, data, error.
• uxc mints a fresh short-lived Coinbase JWT on each private request; do not try to bind a stale pre-generated bearer token when jwt_bearer_v1 is available.
• Coinbase exports ES256 private keys in more than one PEM form; this skill expects the raw downloaded PEM and does not require a manual PKCS#8 conversion step.
• Treat post:/api/v3/brokerage/orders and post:/api/v3/brokerage/orders/batch_cancel as high-risk writes.
• Keep initial product/account pulls narrow with small limit values.
• coinbase-openapi-cli ... is equivalent to uxc https://api.coinbase.com --schema-url ....

References

• Usage patterns: references/usage-patterns.md
• Curated OpenAPI schema: references/coinbase-advanced-trade.openapi.json
• Coinbase Advanced Trade overview: https://docs.cdp.coinbase.com/coinbase-app/advanced-trade-apis/overview