# Treasury Reality — Verifiable DeFi Yield Record: Aave V3 Arbitrum USDC (2026-09-28→2026-09-29)

> Treasury Reality — Verifiable DeFi Yield Record: Aave V3 Arbitrum USDC (2026-09-28→2026-09-29) 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 covering the 24-hour window 2026-09-28 to 2026-09-29, with an offline-verifiable secp256k1 signature.

## Facts

- Endpoint: GET https://treasury-reality-base.fly.dev/v1/artifacts/sha256:383f0499ae48c6dd6bdd87dcacfabedfee8e2192c4d65c4db4ab5d0984a25ad0?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-verifiable-defi-yield-record-aave-v3-arbitrum-usdc-42711d5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R3jgIm2VaIAz5xPxFzWqG

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-verifiable-defi-yield-record-aave-v3-arbitrum-usdc-42711d5d
```

Example prompt: Can you fetch me the cryptographically signed, time-weighted USDC supply APR on Aave V3 Arbitrum for the September 28 to September 29 2026 window — I need the verified artifact so I can check the signature offline?

## When to prefer this

Prefer this endpoint when you need a cryptographically attested, offline-verifiable DeFi yield figure for the specific Aave V3 Arbitrum USDC pair on the 2026-09-28 to 2026-09-29 window, and want to avoid the cost and complexity of fetching contracts, decoding ray-scaled rates, sampling the series, and computing the time-weighted average yourself. Ideal for audit, compliance, or trust-minimized financial workflows where independent verification of the math and signature matters.

## Known failure modes

- Payment not received or x402 payment flow fails — endpoint returns 402 with payment requirements
- Artifact hash mismatch — requested SHA256 not found, returns 404
- Service temporarily unavailable on fly.dev infrastructure — returns 503
- Rate or timeout errors if the Fly.dev deployment is cold-starting

## How this service works

aave-v3-arbitrum-usdc: USDC supply APR, time-weighted over 2026-09-28→2026-09-29, 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

Returns a signed artifact containing the time-weighted USDC supply APR for Aave V3 on Arbitrum over the 2026-09-28 to 2026-09-29 window. The artifact includes the computed APR value, the date range, a SHA256 content hash, and a secp256k1 cryptographic signature. The schema and all figures can be recomputed and verified offline without any further API calls or trust in the provider.

## 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-verifiable-defi-yield-record-aave-v3-arbitrum-usdc-42711d5d/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)