Real-time blockchain event monitoring with webhooks. Use when user asks about setting up webhooks, real-time event streaming, monitoring wallet addresses, tr...
SKILL.md

---
name: moralis-streams-api
description: Real-time blockchain event monitoring with webhooks. Use when user asks about setting up webhooks, real-time event streaming, monitoring wallet addresses, tracking token transfers in real-time, listening to all addresses on a chain, creating/updating/deleting streams, adding/removing addresses from streams, or receiving blockchain events as they happen. Supports all EVM chains. NOT for querying historical or current blockchain state - use moralis-data-api instead.
version: 1.2.1
license: MIT
compatibility: Requires curl for API calls. Requires MORALIS_API_KEY env var for authentication.
metadata:
  author: MoralisWeb3
  homepage: https://docs.moralis.com
  repository: https://github.com/MoralisWeb3/onchain-skills
  openclaw:
    requires:
      env:
        - MORALIS_API_KEY
      bins:
        - curl
    primaryEnv: MORALIS_API_KEY
allowed-tools: Bash Read Grep Glob
---

## CRITICAL: Read Rule Files Before Implementing

**The #1 cause of bugs is using wrong HTTP methods or stream configurations.**

For EVERY endpoint:
1. Read `rules/{EndpointName}.md`
2. Check HTTP method (PUT for create, POST for update, DELETE for delete)
3. Verify stream ID format (UUID, not hex)
4. Use hex chain IDs (0x1, 0x89), not names (eth, polygon)

**Reading Order:**
1. This SKILL.md (core patterns)
2. Endpoint rule file in `rules/`
3. Pattern references in `references/` (for edge cases only)

---

## Setup

### API Key (optional)

**Never ask the user to paste their API key into the chat.** Instead:

1. Check if `MORALIS_API_KEY` is set in the environment (try running `[ -n "$MORALIS_API_KEY" ] && echo "API key is set" || echo "API key is NOT set"`).
2. If not set, offer to create the `.env` file with an empty placeholder: `MORALIS_API_KEY=`
3. Tell the user to open the `.env` file and paste their key there themselves.
4. Let them know: without the key, you won't be able to test or call the Moralis API on their behalf.

If they don't have a key yet, point them to [admin.moralis.com/register](https://admin.moralis.com/register) (free, no credit card).

### Environment Variable Discovery

The `.env` file location depends on how skills are installed:

Create the `.env` file in the project root (same directory the user runs Claude Code from). Make sure `.env` is in `.gitignore`.

### Verify Your Key

```bash
curl "https://api.moralis-streams.com/streams/evm?limit=10" \
  -H "X-API-Key: $MORALIS_API_KEY"
```

---

## Base URL

```
https://api.moralis-streams.com
```

**Important:** Different from Data API (`deep-index.moralis.io`).

## Authentication

All requests require: `X-API-Key: $MORALIS_API_KEY`

---

## HTTP Methods (CRITICAL)

| Action | Method | Endpoint |
|--------|--------|----------|
| Create stream | `PUT` | `/streams/evm` |
| Update stream | `POST` | `/streams/evm/{id}` |
| Delete stream | `DELETE` | `/streams/evm/{id}` |
| Get streams | `GET` | `/streams/evm` |
| Replace addresses | `PATCH` | `/streams/evm/{id}/address` |

**Common mistake:** Using POST to create streams. Use PUT instead.

---

## Stream Types

| Type | Description |
|------|-------------|
| `tx` | Native transactions |
| `log` | Contract event logs |
| `erc20transfer` | ERC20 token transfers |
| `erc20approval` | ERC20 approvals |
| `nfttransfer` | NFT transfers |
| `internalTx` | Internal transactions |

---

## Quick Reference: Most Common Patterns

### Stream ID Format (ALWAYS UUID)

```typescript
// WRONG - Hex format
"0x1234567890abcdef"

// CORRECT - UUID format
"a1b2c3d4-e5f6-7890-abcd-ef1234567890"
```

### Chain IDs (ALWAYS hex)

```typescript
"0x1"     // Ethereum
"0x89"    // Polygon
"0x38"    // BSC
"0xa4b1"  // Arbitrum
"0xa"     // Optimism
"0x2105"  // Base
```

### Event Signatures (topic0)

```typescript
"Transfer(address,address,uint256)"   // ERC20/NFT Transfer
"Approval(address,address,uint256)"   // ERC20 Approval
```

### Status Values (lowercase only)

```typescript
"active"      // CORRECT - normal operating state
"paused"      // CORRECT - manually paused
"error"       // CORRECT - auto-set when webhook success rate <70%
"terminated"  // CORRECT - unrecoverable, after 24h in error
"ACTIVE"      // WRONG
```

---

## Common Pitfalls (Top 5)

1. **Using POST to create streams** - Use `PUT` instead
2. **Wrong base URL** - Use `api.moralis-streams.com`, NOT `deep-index.moralis.io`
3. **Hex stream ID** - Must be UUID format, not hex
4. **String chain names** - Use hex (0x1), not names (eth)
5. **Uppercase status** - Use lowercase ("active", "paused")
6. **Not returning 200 on test webhook** - Stream won't start unless your endpoint returns 2xx on the test webhook sent during create/update

See [references/CommonPitfalls.md](references/CommonPitfalls.md) for complete reference.

---

## Triggers (Read-Only Contract Calls)

Enrich webhook data with on-chain reads (e.g., `balanceOf`). Triggers execute `view`/`pure` functions and attach results to webhook events. Supports dynamic selectors (`$contract`, `$from`, `$to`). See [references/Triggers.md](references/Triggers.md) for complete reference with examples.

---

## Native Balances in Webhooks

Configure `getNativeBalances` to include native token balances (ETH, BNB, etc.) in webhook payloads. Requires Business plan+. See [references/UsefulStreamOptions.md](references/UsefulStreamOptions.md) for configuration details.

---

## Delivery and Error Handling

- **Two webhooks per event**: Unconfirmed (`confirmed: false`) + Confirmed (`confirmed: true`). Idempotent handlers required.
- **Streams auto-terminate after 24 hours in error state** (webhook success rate <70%). This is **unrecoverable** — you must create a new stream.
- **Test webhook**: Sent on every create/update. Must return 200 or stream won't start.

See [references/DeliveryGuarantees.md](references/DeliveryGuarantees.md) and [references/ErrorHandling.md](references/ErrorHandling.md).

---

## Webhook Security

Webhooks are signed with your streams secret (different from API key).

- **Header:** `x-signature`
- **Algorithm:** `sha3(JSON.stringify(body) + secret)`

```javascript
const verifySignature = (req, secret) => {
  const provided = req.headers["x-signature"];
  const generated = web3.utils.sha3(JSON.stringify(req.body) + secret);
  if (generated !== provided) throw new Error("Invalid Signature");
};
```

See [references/WebhookSecurity.md](references/WebhookSecurity.md) for complete examples.

---

## Testing Endpoints

```bash
WEBHOOK_URL="https://your-server.com/webhook"

# List streams (requires limit)
curl "https://api.moralis-streams.com/streams/evm?limit=100" \
  -H "X-API-Key: $MORALIS_API_KEY"

# Create stream (PUT, not POST)
curl -X PUT "https://api.moralis-streams.com/streams/evm" \
  -H "X-API-Key: $MORALIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "webhookUrl": "'${WEBHOOK_URL}'",
    "description": "Test stream",
    "tag": "test",
    "topic0": ["Transfer(address,address,uint256)"],
    "allAddresses": false,
    "chainIds": ["0x1"]
  }'

# Pause stream (POST to status)
curl -X POST "https://api.moralis-streams.com/streams/evm/<stream_id>/status" \
  -H "X-API-Key: $MORALIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"status": "paused"}'
```

---

## Quick Troubleshooting

| Issue | Cause | Solution |
|-------|-------|----------|
| "400 Bad Request" | Invalid config | Check webhookUrl, topic0 format, chainIds |
| "404 Not Found" | Wrong stream ID | Verify UUID format |
| "Method Not Allowed" | Wrong HTTP method | PUT for create, POST for update |
| "Missing limit" | GET /streams/evm | Add `?limit=100` |
| "No webhooks" | Stream paused | Check status is "active" |

---

## Endpoint Catalog

Complete list of all 20 Streams API endpoints organized by category.

### Stream Management

Create, update, delete, and manage streams.

| Endpoint | Description |
|----------|-------------|
| [AddAddressToStream](rules/AddAddressToStream.md) | Add address to stream |
| [CreateStream](rules/CreateStream.md) | Create stream |
| [DeleteAddressFromStream](rules/DeleteAddressFromStream.md) | Delete address from stream |
| [DeleteStream](rules/DeleteStream.md) | Delete stream |
| [DuplicateStream](rules/DuplicateStream.md) | Duplicate stream |
| [GetAddresses](rules/GetAddresses.md) | Get addresses by stream |
| [GetHistory](rules/GetHistory.md) | Get history |
| [GetLogs](rules/GetLogs.md) | Get logs |
| [GetSettings](rules/GetSettings.md) | Get project settings |
| [GetStats](rules/GetStats.md) | Get project stats |
| [GetStatsByStreamId](rules/GetStatsByStreamId.md) | Get project stats by Stream ID |
| [GetStream](rules/GetStream.md) | Get a specific evm stream. |
| [GetStreamBlockDataByNumber](rules/GetStreamBlockDataByNumber.md) | Get webhook data returned on the block number with provided stream config |
| [GetStreamBlockDataToWebhookByNumber](rules/GetStreamBlockDataToWebhookByNumber.md) | Send webhook based on a specific block number using stream config and addresses. |
| [GetStreams](rules/GetStreams.md) | Get streams |
| [ReplaceAddressFromStream](rules/ReplaceAddressFromStream.md) | Replaces address from stream |
| [UpdateStream](rules/UpdateStream.md) | Update stream |
| [UpdateStreamStatus](rules/UpdateStreamStatus.md) | Update stream status |

### Status & Settings

Pause/resume streams and configure settings.

| Endpoint | Description |
|----------|-------------|
| [SetSettings](rules/SetSettings.md) | Set project settings |

### History & Analytics

Stream history, replay, statistics, logs, and block data.

| Endpoint | Description |
|----------|-------------|
| [ReplayHistory](rules/ReplayHistory.md) | Replay history |


## Listen to All Addresses

Set `allAddresses: true` with a `topic0` and `abi` to monitor an event across every contract on a chain (e.g., all ERC20 transfers network-wide). Requires higher-tier plans. See [references/ListenToAllAddresses.md](references/ListenToAllAddresses.md) for complete examples, ABI templates, and gotchas.

## Example: Create ERC20 Transfer Monitor

```bash
curl -X PUT "https://api.moralis-streams.com/streams/evm" \
  -H "X-API-Key: $MORALIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "webhookUrl": "https://your-server.com/webhook",
    "description": "Monitor ERC20 transfers",
    "tag": "erc20-monitor",
    "topic0": ["Transfer(address,address,uint256)"],
    "allAddresses": true,
    "chainIds": ["0x1", "0x89"],
    "advancedOptions": [{
      "topic0": "Transfer(address,address,uint256)",
      "includeNativeHash": true
    }]
  }'
```

---

## Pagination

List endpoints use cursor-based pagination:

```bash
# First page
curl "...?limit=100" -H "X-API-Key: $KEY"

# Next page
curl "...?limit=100&cursor=<cursor>" -H "X-API-Key: $KEY"
```

---

## Supported Chains

All major EVM chains: Ethereum (0x1), Polygon (0x89), BSC (0x38), Arbitrum (0xa4b1), Optimism (0xa), Base (0x2105), Avalanche (0xa86a), and more.

See [references/StreamConfiguration.md](references/StreamConfiguration.md) for complete chain ID list.

---

## Reference Documentation

- [references/CommonPitfalls.md](references/CommonPitfalls.md) - Complete pitfalls reference
- [references/DeliveryGuarantees.md](references/DeliveryGuarantees.md) - At-least-once delivery, dual webhooks, confirmation blocks, test webhooks
- [references/ErrorHandling.md](references/ErrorHandling.md) - Retry schedule, error/terminated states, rate limits, re-org handling
- [references/FAQ.md](references/FAQ.md) - Streams API frequently asked questions
- [references/FilterStreams.md](references/FilterStreams.md) - Webhook data filtering to reduce noise
- [references/ListenToAllAddresses.md](references/ListenToAllAddresses.md) - Monitor events across all contracts on a chain
- [references/MonitorMultipleAddresses.md](references/MonitorMultipleAddresses.md) - Multi-address monitoring patterns
- [references/ReplayFailedWebhooks.md](references/ReplayFailedWebhooks.md) - Replay failed webhook guide
- [references/StreamConfiguration.md](references/StreamConfiguration.md) - Stream config reference
- [references/Triggers.md](references/Triggers.md) - Read-only contract call enrichment (balanceOf, etc.)
- [references/Tutorials.md](references/Tutorials.md) - Real-world examples and tutorials
- [references/UsefulStreamOptions.md](references/UsefulStreamOptions.md) - Advanced stream configuration options
- [references/WebhookResponseBody.md](references/WebhookResponseBody.md) - Webhook payload structure
- [references/WebhookSecurity.md](references/WebhookSecurity.md) - Signature verification

---

## See Also

- Endpoint rules: `rules/*.md` files
- Data API: @moralis-data-api for querying blockchain state
Moralis Streams Api

SKILL.md

related skills
