# MycелiaSignal Cross-Chain Gas Index

> MycелiaSignal Cross-Chain Gas Index is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns a cryptographically signed (Ed25519) cross-chain gas index aggregating gas price data across multiple blockchain networks.

## Facts

- Endpoint: GET https://api.myceliasignal.com/oracle/gas/index
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-myceliasignal-com-29f471b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KTt71JscdQ5ruR_7mI2gg

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 api-myceliasignal-com-29f471b2
```

Example prompt: What's the current cross-chain gas index right now? I need a cryptographically signed attestation I can verify on-chain.

## When to prefer this

Use this endpoint when you need a cryptographically attested, cross-chain aggregate gas index rather than gas prices for a single chain (e.g. use the sibling Polygon gas endpoint for single-chain). Prefer this when building smart contracts, DeFi protocols, or off-chain systems that require a verifiable, multi-network gas benchmark with Ed25519 signature proofs.

## Known failure modes

- Payment not provided or invalid — 402 Payment Required
- Rate limit exceeded — service unavailable
- Oracle data temporarily unavailable — upstream data source failure
- Invalid or expired Ed25519 signature returned — attestation integrity issue

## How this service works

Cross-chain gas index — normalized transaction cost comparison across Ethereum, Base, Arbitrum, Polygon and Solana — Ed25519 signed attestation

## Output

Returns a cross-chain gas index value aggregated across multiple blockchain networks, accompanied by an Ed25519 cryptographic signature for on-chain or off-chain verification. The response enables trustless consumption of gas price benchmarks.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## 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/api-myceliasignal-com-29f471b2/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)