RSI (relative strength index)

Compute the relative strength index (Wilder's smoothing, default period 14) over a price series you supply, such as daily closes. Send POST /api/rsi with the required field values and pay $0.001 per call over x402 or MPP, or call it free by solving a proof-of-work challenge. It returns a JSON object with period, count, rsi, latest and reading.

Returns one value per input position (null until the first full period), the latest value, and a reading: overbought at 70 or above, oversold at 30 or below, else neutral. No market data is fetched: pass your own closes.

Category: Live public data · Tags: stats rsi technical-analysis momentum timeseries · Also found as: relative-strength-index rsi-indicator overbought-oversold

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/rsi \
  -H "Content-Type: application/json" \
  -d '{"values":[44.34,44.09,44.15,43.61,44.33,44.83,45.1,45.42,45.84,46.08,45.89,46.03,45.61,46.28,46.28,46,46.03,46.41,46.22,45.64],"period":14}'

Without payment this returns HTTP 402 Payment Required with the exact price for rsi; any x402 v2 or MPP client pays it and retries.

Example response

{
  "period": 14,
  "count": 20,
  "rsi": [
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    null,
    70.4641,
    66.2496,
    66.4809,
    69.3469,
    66.2947,
    57.915
  ],
  "latest": 57.915,
  "reading": "neutral"
}

From an MCP client

catalog.call {
  "slug": "rsi",
  "params": {
    "values": [
      44.34,
      44.09,
      44.15,
      43.61,
      44.33,
      44.83,
      45.1,
      45.42,
      45.84,
      46.08,
      45.89,
      46.03,
      45.61,
      46.28,
      46.28,
      46,
      46.03,
      46.41,
      46.22,
      45.64
    ],
    "period": 14
  }
}

On the hosted connector at https://agent402.tools/mcp, catalog.call runs rsi free (rate-limited, no wallet). Local install: npx -y agent402-mcp.

Errors and behavior

• values is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Free tier: no outbound network call leaves the server for this tool, so proof-of-work (16 leading zero bits of sha256) pays for it.
• A GET or HEAD to /api/rsi returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/rsi", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "values": [
      44.34,
      44.09,
      44.15,
      43.61,
      44.33,
      44.83,
      45.1,
      45.42,
      45.84,
      46.08,
      45.89,
      46.03,
      45.61,
      46.28,
      46.28,
      46,
      46.03,
      46.41,
      46.22,
      45.64
    ],
    "period": 14
  }),
});

No wallet? Pay with compute

Fetch a challenge, solve the sha256 puzzle (16 leading zero bits, a fraction of a second of CPU), and resend with the X-Pow-Solution header:

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=rsi")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/rsi", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"values":[44.34,44.09,44.15,43.61,44.33,44.83,45.1,45.42,45.84,46.08,45.89,46.03,45.61,46.28,46.28,46,46.03,46.41,46.22,45.64],"period":14}) });

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