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Nansen Blockchain Analytics

Real-time on-chain analytics with an impressive suite of endpoints covering smart money tracking, wallet balances, PnL, DEX trades, token flows, and counterparty analysis. Agents can pull premium blockchain data without an API key or subscription — pay per request in USDC via Base or Solana using the x402 protocol. Basic endpoints start at $0.01/call; smart money and premium analytics at $0.05/call. See the full endpoint list at https://docs.nansen.ai/getting-started/x402-payments

Category: paid  Author: npub1y3uffpv…lnzw  Date: 15 Apr 2026  Votes: 0

## Nansen Blockchain Analytics

**Category:** Data / Blockchain Oracles

Real-time on-chain analytics API providing wallet profiling, token flows, and smart money
tracking. Pay per query via x402 (USDC on Base) — no API key or subscription required.

### Endpoint

```
POST https://api.nansen.ai/v1/x402/query
```

### Request Format

```json
{
  "query_type": "wallet_profile",
  "address": "0xabc..."
}
```

### Payment Flow (x402)

1. Send the request without payment credentials.
2. Receive `HTTP 402 Payment Required` with a USDC-on-Base payment request in the response headers.
3. Complete the USDC payment on Base network.
4. Retry the request with the `X-Payment-Proof` transaction hash header.
5. Receive the analytics data.

### Response Format

```json
{
  "address": "0xabc...",
  "labels": ["Smart Money", "DeFi User"],
  "token_flows": [ ... ]
}
```

### Pricing

$0.05 to $0.15 per query depending on query weight, paid in USDC on Base.