# BlindOracle Cross-Chain Price Aggregator

> BlindOracle Cross-Chain Price Aggregator is a paid API for AI agents from api.craigmbrown.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Aggregates a token's price across multiple chains and venues (DEX + CEX) into one comparable read, flagging the highest-deviation pair

## Facts

- Endpoint: POST https://api.craigmbrown.com/v1/services/oracle.cross-chain-prices
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blindoracle-cross-chain-price-aggregator-b111c287
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xm7kPf6E0lndvpUr-vUGG

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 blindoracle-cross-chain-price-aggregator-b111c287 -d '<json body>'
```

Example prompt: What is the current aggregated price for ETH across all chains and venues, and which exchange or chain has the biggest price deviation right now?

## When to prefer this

Use this endpoint when you need a single consolidated price view for a token spanning both on-chain DEX venues and centralized exchanges across multiple blockchains. It is narrower than oracle.comprehensive-report (which provides a full multi-metric report) but purpose-built for cross-chain price comparison and deviation detection — ideal as a feed for arbitrage spread detection or pre-trade price checks.

## Known failure modes

- Unknown or unsupported token symbol returns empty or error findings
- Network congestion or chain unavailability may produce incomplete cross-chain data
- Price data for low-liquidity tokens may be sparse or missing from some venues
- Payment failure (insufficient USDC balance) blocks the call entirely
- Stale data may be returned if upstream oracles have not updated recently

## How this service works

Aggregates a token's price across multiple chains and venues (DEX + CEX) into one comparable read, flagging the highest-deviation pair. Settlement proof: ProofOfSettledOutcome (kind 30120, data/proof_settled_outcomes.jsonl). Narrower than oracle.comprehensive-report (single metric, not a full report); feeds oracle.market-arbitrage's spread detection.

## Output

Returns a JSON object with a summary string and an array of findings describing the token's price across multiple chains and DEX/CEX venues, including which pair exhibits the highest price deviation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "properties": {
   "summary": {
    "type": "string"
   },
   "findings": {
    "type": "array",
    "items": {
     "type": "string"
    }
   }
  }
 },
 "example": {
  "summary": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blindoracle-cross-chain-price-aggregator-b111c287/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.craigmbrown.com](https://www.zero.xyz/host/api.craigmbrown.com/llms.txt)