Nulucre Agents — The On-Chain Credit Score for AI Agents

Two autonomous AI agents accepting USDC micropayments via x402 on Base mainnet and Stellar pubnet. No API keys, no accounts, no subscriptions — pure agent-to-agent commerce.

Agents

🔵 Reputation Oracle

The credit score for crypto wallets. Returns a 0-100 trust score across 81+ chains with ECDSA cryptographic proof.

Scoring Breakdown

Component	Max Score	Source
Wallet Age	30	Etherscan V2
TX Volume	40	Etherscan V2
DeFi Activity	20	Moralis / DeBank
Base Activity	10	Basescan via Etherscan V2
Multi-Chain EVM	10	Alchemy (Polygon, Arbitrum, Optimism)
Ankr Coverage	10	Ankr (81+ chains)
Total	100+	Multi-source

Pricing & Networks

Tier	Endpoint	Price	Networks
Standard	GET /reputation/{wallet}	$0.003 USDC	Base Mainnet + Stellar Pubnet
Signed	GET /reputation/signed/{wallet}	$0.01 USDC	Base Mainnet + Stellar Pubnet
Stellar Score	GET /reputation/stellar/{gAddress}	$0.003 USDC	Stellar Pubnet
Stellar Signed	GET /reputation/stellar/signed/{gAddress}	$0.01 USDC	Stellar Pubnet
Verification	POST /verify	$0.01 USDC	Base Mainnet + Stellar Pubnet
TVL Lookup	GET /tvl/{protocol}	FREE	-
Health	GET /health	FREE	-

Cryptographic Verification

Signed scores are independently verifiable by any agent:

• JWKS endpoint: https://nulucre.com/.well-known/jwks.json
• Algorithm: ECDSA-P256
• Signed by: nulucre.com

Status Labels:

Score	Status
80–100	TRUSTED
60–79	VERIFIED
40–59	CAUTION
20–39	RISKY
0–19	BLACKLISTED

Standard Response:

{
  "wallet": "0x123...abc",
  "score": 97,
  "status": "TRUSTED",
  "breakdown": {
    "walletAge": { "score": 30, "raw": "3827 days" },
    "txVolume": { "score": 40, "raw": "10000 txs" },
    "defiActivity": { "score": 8, "raw": "4 protocols" },
    "multiChain": { "score": 9, "raw": "3 EVM chains" },
    "ankrCoverage": { "score": 10, "raw": "16 chains with assets" }
  },
  "chains": ["ethereum", "base", "polygon", "arbitrum", "optimism", "ankr-81-chains"],
  "timestamp": "2026-03-24T00:00:00.000Z"
}

Signed Response:

{
  "wallet": "0x123...abc",
  "score": 97,
  "status": "TRUSTED",
  "proof": {
    "signature": "MEQCIFruX2vD...",
    "algorithm": "ECDSA-P256",
    "signedBy": "nulucre.com",
    "verifyAt": "https://nulucre.com/.well-known/jwks.json"
  }
}

---

🟡 Fact Verification Agent — $0.01 USDC per report

Verifies DeFi protocol TVL claims against DeFi Llama on-chain data. Returns ACCURATE, MISLEADING, or FALSE.

Endpoint: POST https://nulucre.com/verify

Request Body:

{
  "claim": "Aave has $12B TVL",
  "protocol": "aave"
}

Example Response:

{
  "verdict": "ACCURATE",
  "claimedTVL": 12000000000,
  "actualTVL": 11840000000,
  "discrepancyPercent": -1.3,
  "dataSource": "DeFi Llama",
  "timestamp": "2026-03-24T00:00:00.000Z"
}

Verdicts:

• ACCURATE (< 5% difference)
• MOSTLY_ACCURATE (5–10%)
• INACCURATE (10–25%)
• MISLEADING (25–50%)
• FALSE (> 50%)

---

🆓 Free Endpoints

Health check: GET https://nulucre.com/health

Raw TVL lookup: GET https://nulucre.com/tvl/{protocol}

---

How x402 Payment Works

1. Agent calls your endpoint
2. Server returns 402 Payment Required with payment details for Base or Stellar
3. Agent sends USDC on Base mainnet or Stellar pubnet
4. Agent includes payment proof in next request header
5. Server verifies and returns data

No accounts. No API keys. Fully autonomous agent-to-agent payments.

Payment Details

Network	Token	Address
Base Mainnet	USDC (ERC-20)	0xd97C122cB81894213C67Bcc774448955d09915bC
Stellar Pubnet	USDC (SEP-41)	GCRUBFDANV52JP3URUJ7EZGPZKFEESBTW7T3FV2SJXZZGB6HDNRBWV24

Stack

• Node.js + Express
• x402 payment protocol
• Etherscan V2 (wallet age + tx volume)
• Moralis / DeBank (DeFi activity)
• Alchemy (Polygon, Arbitrum, Optimism)
• Ankr (81+ chains)
• DeFi Llama (TVL verification)
• ECDSA-P256 cryptographic signing
• OpenZeppelin Stellar facilitator
• PM2 + Nginx on Ubuntu VPS

Agent Discovery

https://nulucre.com/.well-known/SKILL.md
https://nulucre.com/.well-known/x402.json
https://nulucre.com/.well-known/agent.json
https://nulucre.com/.well-known/jwks.json
https://nulucre.com/openapi.json

🆓 Try It Free — No Payment Needed

Test the API instantly with no x402 setup required:

curl https://nulucre.com/reputation/0x000000000000000000000000000000000000TEST

Returns a sample wallet score response immediately. For real wallet scoring, use any EVM address — $0.001 USDC via x402.

Quick Start

# Free health check
curl https://nulucre.com/health

# Free TVL lookup
curl https://nulucre.com/tvl/aave

# EVM wallet reputation query (requires x402 payment)
curl https://nulucre.com/reputation/0xYourWalletAddress

# EVM signed reputation query with ECDSA proof
curl https://nulucre.com/reputation/signed/0xYourWalletAddress

# Stellar native wallet reputation query (requires x402 payment)
curl https://nulucre.com/reputation/stellar/GYourStellarAddress

# Stellar signed reputation query with ECDSA proof
curl https://nulucre.com/reputation/stellar/signed/GYourStellarAddress

# Fact verification (requires x402 payment)
curl -X POST https://nulucre.com/verify \
  -H "Content-Type: application/json" \
  -d '{"claim": "Uniswap has $5B TVL", "protocol": "uniswap"}'

Copy and paste this replacing your existing Quick Start section → commit! 👊

Links

• 🌐 Website: https://nulucre.com
• 📦 x402.json: https://nulucre.com/.well-known/x402.json
• 🔑 JWKS: https://nulucre.com/.well-known/jwks.json
• 📧 Contact: [email protected]

License

MIT