# BRL/USD Live Exchange Rate Oracle (Ed25519 Signed)

> BRL/USD Live Exchange Rate Oracle (Ed25519 Signed) is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Returns a live BRL/USD exchange rate derived from exchange order books (USDT/USD ÷ USDT/BRL), with DePix peg pricing and an Ed25519 signed attestation.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/price/brl/usd?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/brl-usd-live-exchange-rate-oracle-ed25519-signed-02d210fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ruDsQvcK61Mt8eVq_FXzW

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability brl-usd-live-exchange-rate-oracle-ed25519-signed-02d210fc
```

Example prompt: What's the live BRL to USD exchange rate right now? I need the cryptographically signed attestation from order book data, including the DePix peg price.

## When to prefer this

Choose this endpoint when you need a cryptographically verifiable, signed BRL/USD exchange rate derived from live crypto exchange order books rather than traditional forex APIs. Especially valuable when you need DePix peg pricing, an auditable Ed25519 attestation for compliance or logging, or 24/7 availability without traditional banking hours constraints.

## Known failure modes

- Exchange order book data temporarily unavailable, causing rate computation failure
- Ed25519 signing service failure preventing attestation generation
- Rate limiting or payment verification failure for the $0.01 USDC per call fee
- Stale or missing USDT/BRL or USDT/USD order book data leading to no price output

## How this service works

BRL/USD — live Brazilian real to US dollar from exchange order books (USDT/USD ÷ USDT/BRL), 24/7; prices DePix (1:1 BRL on Liquid) at its peg — Ed25519 signed attestation

## Output

Returns a live BRL/USD exchange rate computed from exchange order book data (USDT/USD ÷ USDT/BRL), the DePix price at its 1:1 BRL peg, and an Ed25519 signed attestation confirming the data integrity and timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/brl-usd-live-exchange-rate-oracle-ed25519-signed-02d210fc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.myceliasignal.com](https://www.zero.xyz/host/api.myceliasignal.com/llms.txt)