# Treasury Reality — Aave V3 Arbitrum USDC Supply APR (2026-09-23→2026-09-24)

> Treasury Reality — Aave V3 Arbitrum USDC Supply APR (2026-09-23→2026-09-24) is a paid API for AI agents from treasury-reality-base.fly.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-02).

Returns a cryptographically signed, time-weighted USDC supply APR record for Aave V3 on Arbitrum over a specific 24-hour period, verifiable offline without trusting the provider.

## Facts

- Endpoint: GET https://treasury-reality-base.fly.dev/v1/artifacts/sha256:3d13bc011648a3688e50956efb2b5407bcce12f277c727528691289a88b868bf?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/treasury-reality-aave-v3-arbitrum-usdc-supply-apr-2026-09-23-2026-09-24-24007eb5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y4l-iaqJYa0jdG99cSmgc

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 treasury-reality-aave-v3-arbitrum-usdc-supply-apr-2026-09-23-2026-09-24-24007eb5
```

Example prompt: Can you fetch the signed, time-weighted USDC supply APR record for Aave V3 on Arbitrum covering September 23–24 2026? I want the verified figure I can check offline against the secp256k1 signature.

## When to prefer this

Prefer this endpoint when you need a cryptographically attested, time-weighted DeFi yield figure for Aave V3 USDC on Arbitrum for the specific 2026-09-23 to 2026-09-24 window, without spending agent compute decoding raw ray-scaled contracts or sampling on-chain data yourself. It is ideal for audit trails, oracle inputs, or compliance workflows that require offline verifiability via secp256k1 signatures rather than trusting a live API response.

## Known failure modes

- Payment not included or invalid x402 payment header — returns 402 Payment Required
- Artifact hash mismatch — SHA256 in the URL does not correspond to a stored artifact, returns 404
- Network or hosting unavailability on fly.dev infrastructure — returns 5xx
- Rate or signature verification fails offline if the local recomputation diverges from the published schema

## How this service works

aave-v3-arbitrum-usdc: USDC supply APR, time-weighted over 2026-09-23→2026-09-24, signed. Cheaper than the agent turns you'd burn finding the contracts, decoding ray-scaled rates, sampling the series, and time-weighting it — you trust the math, not us. Verify it offline — schema, every published figure recomputed, and the secp256k1 signature — with no API call and no trust in us.

## Output

A signed artifact containing the time-weighted USDC supply APR for Aave V3 on Arbitrum over the 2026-09-23 to 2026-09-24 window. The response includes the computed yield rate (derived from ray-scaled on-chain data), sampling methodology, and a secp256k1 cryptographic signature over the result, allowing full offline verification of both the math and the authenticity of the figure without any additional API calls.

## 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": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/treasury-reality-aave-v3-arbitrum-usdc-supply-apr-2026-09-23-2026-09-24-24007eb5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from treasury-reality-base.fly.dev](https://www.zero.xyz/host/treasury-reality-base.fly.dev/llms.txt)