Coincap OpenAPI

Name: Coincap OpenAPI API
Brand: CoinCap
Availability: InStock

✓ Official Vendor SpecFinanceBankingbearer9 EndpointsREST

For Agents

Retrieve live crypto asset prices, historical price series, market pairs, exchange data, and fiat conversion rates from a single REST API.

Install Jentic One Beta

Connect the Coincap OpenAPI to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Coincap OpenAPI, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Coincap OpenAPI API.

List ranked crypto assets with current prices, market caps, and supply figures

Look up a specific asset by slug to retrieve detailed metrics

Pull historical price series for an asset over a chosen interval

GET STARTED

Start building with Coincap OpenAPI API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use Coincap OpenAPI API for, with concrete tasks.

★ Lightweight Crypto Price Widget

Power a price ticker, dashboard widget, or mobile app card with live crypto pricing without paying for an enterprise data feed. CoinCap returns ranked assets with USD prices, market cap, supply, and 24-hour change in a single call. Integration takes well under an hour.

Call GET /v3/assets with a limit of 10 and return the top assets by rank with their priceUsd values

Historical Price Charting

Render a price history chart for any supported asset over minute, hour, or day intervals. The /v3/assets/{slug}/history endpoint returns time-series data ready for plotting. Suitable for portfolio apps, blogs, and educational tools.

Fetch hourly history for bitcoin over the past day via GET /v3/assets/bitcoin/history with interval=h1 and return the price points

Cross-Exchange Market Discovery

Discover where a specific cryptocurrency trades and at what volumes by listing the markets associated with the asset. Useful for arbitrage research, liquidity analysis, and routing trades to the best venue.

Call GET /v3/assets/ethereum/markets and return the top venues by 24-hour USD volume

AI Crypto Analyst via Jentic

Build an agent that answers ad-hoc crypto questions by combining live and historical CoinCap data through Jentic. The agent expresses an intent in natural language; Jentic routes it to the correct CoinCap endpoint and executes the call with stored credentials. Cost-effective for assistants that need basic crypto pricing without a heavy data subscription.

Through Jentic, fetch the current price and 24-hour change for bitcoin and summarise the move in one sentence

Key Endpoints

9 endpoints — coincap is a cryptocurrency market data api that aggregates real-time asset prices, exchange listings, market pairs, and conversion rates.

METHOD

PATH

DESCRIPTION

GET

/v3/assets

List ranked crypto assets with current market data

GET

/v3/assets/{slug}

Look up a specific asset by slug

GET

/v3/assets/{slug}/history

Retrieve historical price series for an asset

GET

/v3/assets/{slug}/markets

List markets where a given asset trades

GET

/v3/exchanges

List supported cryptocurrency exchanges

GET

/v3/rates

List conversion rates

GET

/v3/assets

List ranked crypto assets with current market data

GET

/v3/assets/{slug}

Look up a specific asset by slug

GET

/v3/assets/{slug}/history

Retrieve historical price series for an asset

GET

/v3/assets/{slug}/markets

List markets where a given asset trades

GET

/v3/exchanges

List supported cryptocurrency exchanges

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Your CoinCap bearer token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'get the current bitcoin price' or 'list markets for an asset', and Jentic returns the matching CoinCap operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

Time to first call

FAQs

Specific to using Coincap OpenAPI API through Jentic.

What authentication does the CoinCap API use?

CoinCap v3 uses bearer token authentication - pass your API key in the Authorization header as Bearer {key}. Through Jentic, the key is stored in the encrypted vault and the agent receives a scoped execution token rather than the raw bearer string.

Can I retrieve historical price data with the CoinCap API?

Yes. GET /v3/assets/{slug}/history returns price points for a chosen asset over an interval such as m1, m5, h1, h2, h6, h12, or d1. Pair the interval with start and end timestamps to bound the range.

What are the rate limits for the CoinCap API?

Rate limits depend on the API key tier. The OpenAPI spec does not declare per-endpoint thresholds; check the tier attached to your CoinCap account. Free keys have lower throughput than paid tiers.

How do I look up a single asset price through Jentic?

Install the SDK with pip install jentic, search Jentic for get current crypto asset price, load the schema for GET /v3/assets/{slug}, and execute with the asset slug (for example bitcoin).

Does CoinCap return data for stablecoins and fiat currencies?

Stablecoins are listed in /v3/assets like any other crypto asset. Fiat conversion rates are exposed separately via /v3/rates and /v3/rates/{slug}, both quoted relative to USD.

Can I see which exchanges trade a specific cryptocurrency?

Yes. GET /v3/assets/{slug}/markets returns the trading pairs and exchanges where the asset is listed, along with per-market 24-hour USD volume - useful for liquidity and arbitrage analysis.

Can I limit what my agent is allowed to do with the CoinCap API?

Yes. Because Jentic One is self-hosted, you decide which CoinCap operations your agent may call and which credentials it uses. CoinCap is read-only pricing and market data, so you can grant only the calls the agent needs, such as reading an asset price with GET /v3/assets/{slug} or listing exchanges with GET /v3/exchanges, while withholding broader operations like full history retrieval via GET /v3/assets/{slug}/history unless you add them. Your rules set the boundary, and the stored bearer token is injected only for the operations you permit.