watchers.crypto-address-activity

# 1. Probe the endpoint with no auth — receive 402 with PaymentRequirements
curl -sS -X POST 'https://2s.io/api/watchers/crypto-address-activity' \
  -H 'Content-Type: application/json' \
  -d '{"chain":"base","address":"xxxxxxxxxxxxxxxxxxxx","callbackUrl":"https://example.com","direction":"in","assetTypes":["native"],"minValueUsd":0,"payload":{},"expiresInSeconds":60,"maxFires":1,"label":"example"}'

# 2. Sign the EIP-3009 transferWithAuthorization for the advertised price +
#    payTo from the 402 envelope, then retry with PAYMENT-SIGNATURE:
curl -sS -X POST 'https://2s.io/api/watchers/crypto-address-activity' \
  -H 'Content-Type: application/json' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>' \
  -d '{"chain":"base","address":"xxxxxxxxxxxxxxxxxxxx","callbackUrl":"https://example.com","direction":"in","assetTypes":["native"],"minValueUsd":0,"payload":{},"expiresInSeconds":60,"maxFires":1,"label":"example"}'

# Or just use the canonical runner — it handles the whole loop:
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/watchers/crypto-address-activity'

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.watchers.cryptoAddressActivity({
  "chain": "base",
  "address": "xxxxxxxxxxxxxxxxxxxx",
  "callbackUrl": "https://example.com",
  "direction": "in",
  "assetTypes": [
    "native"
  ],
  "minValueUsd": 0,
  "payload": {},
  "expiresInSeconds": 60,
  "maxFires": 1,
  "label": "example"
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.watchers.crypto_address_activity(chain="base", address="xxxxxxxxxxxxxxxxxxxx", callbackUrl="https://example.com", direction="in", assetTypes=["native"], minValueUsd=0, payload={}, expiresInSeconds=60, maxFires=1, label="example")

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
//    EVM_PRIVATE_KEY funds x402 payments per call.

// claude_desktop_config.json
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

// 2. Once the server is running, agents call this tool via standard MCP:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "watchers.crypto-address-activity",
    "arguments": {
      "chain": "base",
      "address": "xxxxxxxxxxxxxxxxxxxx",
      "callbackUrl": "https://example.com",
      "direction": "in",
      "assetTypes": [
        "native"
      ],
      "minValueUsd": 0,
      "payload": {},
      "expiresInSeconds": 60,
      "maxFires": 1,
      "label": "example"
    }
  }
}

{
  "ok": true,
  "items": [
    {
      "watcherId": "example",
      "status": "example",
      "chain": "example",
      "address": "example",
      "direction": "example",
      "assetTypes": [
        "example"
      ],
      "minValueUsd": 1,
      "maxFires": 1,
      "firesRemaining": 1,
      "expiresAt": "example",
      "statusUrl": "example",
      "callbackSigner": "example"
    }
  ],
  "total": 1,
  "source": {
    "provider": "example",
    "url": "example",
    "license": "example"
  }
}