# SYNTHORA Multi-Chain Gas Price Oracle

> SYNTHORA Multi-Chain Gas Price Oracle is a paid API for AI agents from owlracle-multichain-gas-oracle.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns tiered gas price estimates (base fee, max fee, priority fee) plus block time and tx-per-block for Ethereum, Polygon, BSC, and other EVM chains via Owlracle.

## Facts

- Endpoint: POST https://owlracle-multichain-gas-oracle.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-multi-chain-gas-price-oracle-9d82a856
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yi7DcHGJBUkEVPGKEwjq2

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 synthora-multi-chain-gas-price-oracle-9d82a856 -d '<json body>'
```

Example prompt: Pull the current gas price estimates for Ethereum, Polygon, and BSC — give me base fee, max fee, and estimated confirmation time for each chain so I can decide where to route my transaction.

## When to prefer this

Choose this endpoint when you need multi-chain gas price data in a single call with confirmation-speed tiers, especially for autonomous transaction agents or execution routers that need to compare Ethereum, Polygon, and BSC gas costs simultaneously. Prefer this over single-chain RPC calls when cross-chain price comparison or agent-to-agent routing decisions are required.

## Known failure modes

- Owlracle upstream API unavailable — returns error or stale data
- Unsupported chain requested — may return null or missing fields for that chain
- Invalid or missing keys/caller fields — authentication or routing failure
- Network timeout to underlying oracle — delayed or failed response
- Chain has zero base fee (e.g. BSC) — base_fee_gwei returns 0, which is expected but may confuse consumers

## How this service works

Returns tiered gas price estimates (acceptance-probability speeds with maxFeePerGas, priority fee and base fee) plus average block time and tx-per-block for Ethereum, Polygon, BSC and more from Owlracle. Serves autonomous transaction agents and agent-to-agent execution routers pricing gas per confirmation confidence across chains. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A JSON object containing per-chain gas data: base_fee_gwei, gas_price_gwei, and estimated_time_sec for each requested chain (Ethereum, Polygon, BSC, and others), along with provenance indicating the Owlracle source URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "keys": {
   "type": "string",
   "description": "keys"
  },
  "caller": {
   "type": "string",
   "description": "caller"
  },
  "payload": {
   "type": "string",
   "description": "payload"
  },
  "provides": {
   "type": "string",
   "description": "provides"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "owlracle-multichain-gas-oracle",
  "result": {
   "bsc": {
    "base_fee_gwei": 0,
    "gas_price_gwei": 0,
    "estimated_time_sec": 0
   },
   "polygon": {
    "base_fee_gwei": 249.203563058,
    "gas_price_gwei": 0,
    "estimated_time_sec": 0
   },
   "ethereum": {
    "base_fee_gwei": 0.093168755,
    "gas_price_gwei": 0,
    "estimated_time_sec": 0
   }
  },
  "provenance": {
   "url": "https://api.owlracle.info/v4/eth/gas",
   "source": "Multi-Chain Gas Price Oracle"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-multi-chain-gas-price-oracle-9d82a856/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from owlracle-multichain-gas-oracle.hergertsynthora.com](https://www.zero.xyz/host/owlracle-multichain-gas-oracle.hergertsynthora.com/llms.txt)