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CoinCap RSI (Relative Strength Index) Endpoint
x402
CoinCap RSI (Relative Strength Index) Endpoint is a paid API for AI agents from rest.coincap.io, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-13).
Returns the Relative Strength Index (RSI) technical indicator for a specified cryptocurrency asset slug
Price / call$0.004
Success—
StatusUnknown
How this service works
CoinCap gives AI agents, apps, and developers real-time cryptocurrency market data. Two ways to access: - **API key** — sign up at https://coincap.io and pass `Authorization: Bearer <key>` or `?apiKey=<key>`. - **Keyless x402** (agents) — the 10 `agentFriendly` endpoints accept per-call USDC payment on Base via the [x402 protocol](https://x402.gitbook.io/x402). No signup needed. See `/.well-known/x402.json` for the machine-readable payment catalog.
Output
Returns RSI technical indicator data for the specified cryptocurrency asset, including the RSI value (typically 0–100) that indicates whether the asset is overbought (above 70), oversold (below 30), or neutral, along with any associated metadata such as the time period used for calculation.
Example use cases
Crypto trading momentum check
“Pull the RSI for ethereum right now and tell me whether it looks overbought, oversold, or neutral — I'm deciding whether to enter a position.”
Automated trading signal alert
“Check the RSI for solana and alert me if it drops below 30, indicating it might be oversold and worth buying.”
Portfolio rebalancing decision support
“I'm thinking about trimming my cardano position — what does the RSI look like for cardano right now? Is it in overbought territory?”
Technical details
Endpoint
GEThttps://rest.coincap.io/v3/agentFriendly/ta/%7Bslug%7D/rsiWhen to prefer
Choose this endpoint when you need RSI specifically for cryptocurrency assets and want a per-call pay-as-you-go model via x402 USDC micropayments on Base (no API key signup required). Prefer this over general crypto data endpoints when you specifically need momentum/oscillator technical indicators rather than raw price data. Prefer over alternatives when building autonomous agent workflows where signing up for API keys is impractical.
Side effects
- Invalid or unrecognized asset slug returns an error or empty result
- Payment failure via x402 protocol if USDC balance is insufficient
- Rate limiting if too many requests are made without valid API key or payment
- Network timeout for slow response from upstream market data feeds
- Asset slug not found if the coin is delisted or not tracked by CoinCap
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slugrequired | string |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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