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CoinCap Asset Market-Cap History
x402
CoinCap Asset Market-Cap History is a paid API for AI agents from rest.coincap.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns a historical time-series of market capitalization data points for a specific cryptocurrency asset identified by its CoinCap slug.
Price / call$0.01
Success—
StatusUnknown
How this service works
Historical market-cap series for an asset slug (capped data points).
Output
Returns a capped series of historical market capitalization data points for the specified asset slug, each containing a timestamp and the corresponding market cap value in USD, allowing analysis of how the asset's total market valuation has changed over time.
Example use cases
Crypto portfolio valuation over time
“Can you grab the historical market cap data for ethereum from CoinCap? I want to see how its total valuation has trended so I can understand its growth trajectory.”
Research report on Bitcoin dominance
“I'm writing a report on Bitcoin's market dominance — can you fetch bitcoin's historical market cap series from CoinCap so I can chart how it has changed?”
Comparing asset maturity for investment decision
“I'm deciding between investing in solana versus cardano — can you pull the historical market cap history for solana from CoinCap so I can see how established it is by valuation?”
Technical details
Endpoint
GEThttps://rest.coincap.io/v3/agentFriendly/asset_mcap_history/bitcoinWhen to prefer
Use this endpoint when you specifically need historical market capitalization data for a single cryptocurrency asset identified by its CoinCap slug. Prefer this over general price history endpoints when total market valuation (rather than per-unit price) is the metric of interest. It is ideal for trend analysis, charting market cap growth, or comparing an asset's historical valuation footprint.
Side effects
- Invalid or unknown asset slug returns an error or empty result
- Rate limiting or payment failure results in a 402 or 429 response
- Network timeouts for slow responses
- Capped data points may not cover the full historical range requested
- Slug casing or formatting mismatch may cause lookup failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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