# Send Spark Bitcoin L2 Proxy for AI Agents to your agent
Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.
## Fast path
- Download the package from Yavira.
- Extract it into a folder your agent can access.
- Paste one of the prompts below and point your agent at the extracted folder.
## Suggested prompts
### New install

```text
I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.
```
### Upgrade existing

```text
I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.
```
## Machine-readable fields
```json
{
  "schemaVersion": "1.0",
  "item": {
    "slug": "sparkbtcbot-proxy",
    "name": "Spark Bitcoin L2 Proxy for AI Agents",
    "source": "tencent",
    "type": "skill",
    "category": "开发工具",
    "sourceUrl": "https://clawhub.ai/echennells/sparkbtcbot-proxy",
    "canonicalUrl": "https://clawhub.ai/echennells/sparkbtcbot-proxy",
    "targetPlatform": "OpenClaw"
  },
  "install": {
    "downloadUrl": "/downloads/sparkbtcbot-proxy",
    "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=sparkbtcbot-proxy",
    "sourcePlatform": "tencent",
    "targetPlatform": "OpenClaw",
    "packageFormat": "ZIP package",
    "primaryDoc": "SKILL.md",
    "includedAssets": [
      "SKILL.md"
    ],
    "downloadMode": "redirect",
    "sourceHealth": {
      "source": "tencent",
      "slug": "sparkbtcbot-proxy",
      "status": "healthy",
      "reason": "direct_download_ok",
      "recommendedAction": "download",
      "checkedAt": "2026-05-09T07:50:31.622Z",
      "expiresAt": "2026-05-16T07:50:31.622Z",
      "httpStatus": 200,
      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=sparkbtcbot-proxy",
      "contentType": "application/zip",
      "probeMethod": "head",
      "details": {
        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=sparkbtcbot-proxy",
        "contentDisposition": "attachment; filename=\"sparkbtcbot-proxy-1.1.0.zip\"",
        "redirectLocation": null,
        "bodySnippet": null,
        "slug": "sparkbtcbot-proxy"
      },
      "scope": "item",
      "summary": "Item download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this item.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/sparkbtcbot-proxy"
    },
    "validation": {
      "installChecklist": [
        "Use the Yavira download entry.",
        "Review SKILL.md after the package is downloaded.",
        "Confirm the extracted package contains the expected setup assets."
      ],
      "postInstallChecks": [
        "Confirm the extracted package includes the expected docs or setup files.",
        "Validate the skill or prompts are available in your target agent workspace.",
        "Capture any manual follow-up steps the agent could not complete."
      ]
    }
  },
  "links": {
    "detailUrl": "https://openagent3.xyz/skills/sparkbtcbot-proxy",
    "downloadUrl": "https://openagent3.xyz/downloads/sparkbtcbot-proxy",
    "agentUrl": "https://openagent3.xyz/skills/sparkbtcbot-proxy/agent",
    "manifestUrl": "https://openagent3.xyz/skills/sparkbtcbot-proxy/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/sparkbtcbot-proxy/agent.md"
  }
}
```
## Documentation

### Spark Bitcoin L2 Proxy for AI Agents

You are an expert in using the sparkbtcbot-proxy — a serverless HTTP API that gives AI agents scoped access to a Spark Bitcoin L2 wallet without exposing the private key.

### Why Use the Proxy Instead of Direct SDK

ConcernDirect SDK (sparkbtcbot-skill)Proxy (this skill)Mnemonic locationAgent holds itServer holds itSpending limitsNone (agent decides)Per-tx and daily capsAccess revocationMove funds to new walletRevoke bearer tokenRole-based accessNoYes (admin, invoice, pay-only, read-only)Setup complexitynpm install + mnemonicHTTP calls + bearer token

Use the proxy when:

You don't trust the agent with full wallet control
You need spending limits or audit logs
You want to revoke access without moving funds
Multiple agents share one wallet with different permissions

Use direct SDK when:

Testing or development
Agent needs offline signing
You're building the proxy itself

### Before You Start

Deploy your own proxy — see sparkbtcbot-proxy for setup instructions. The proxy runs on Vercel (free tier works) with Upstash Redis.


Use HTTPS only — never connect to a proxy over plain HTTP. All Vercel deployments use HTTPS by default.


Create least-privilege tokens — don't give agents admin tokens. Use the most restrictive role that works:

read-only for monitoring/dashboard agents
invoice for agents that receive payments but don't spend
pay-only for agents that pay L402 paywalls but don't create invoices
admin only for your own management scripts



Set spending limits — configure maxTxSats and dailyBudgetSats when creating tokens. The proxy enforces these server-side.


Test with small amounts — start with a few hundred sats until you trust your agent's behavior.


Have a revocation plan — know how to revoke tokens via DELETE /api/tokens if an agent is compromised.

### Token Roles

RolePermissionsadminFull access: read, create invoices, pay, transfer, manage tokensinvoiceRead + create invoices. Cannot pay or transfer.pay-onlyRead + pay invoices and L402. Cannot create invoices or transfer.read-onlyRead only (balance, info, transactions, logs). Cannot pay or create invoices.

### Base URL

The proxy runs on Vercel. Your base URL will look like:

https://your-deployment.vercel.app

All requests require authentication:

Authorization: Bearer <your-token>

### Read Operations (any role)

Get Balance

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/balance"

Response:

{
  "success": true,
  "data": {
    "balance": "50000",
    "tokenBalances": {
      "btkn1...": {
        "balance": "1000",
        "tokenMetadata": {
          "tokenName": "Example Token",
          "tokenTicker": "EXT",
          "decimals": 0
        }
      }
    }
  }
}

Get Wallet Info

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/info"

Response:

{
  "success": true,
  "data": {
    "sparkAddress": "sp1p...",
    "identityPublicKey": "02abc..."
  }
}

Get Deposit Address (L1 Bitcoin)

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/deposit-address"

Response:

{
  "success": true,
  "data": {
    "address": "bc1p..."
  }
}

Get Transaction History

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/transactions?limit=10&offset=0"

Get Fee Estimate

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/fee-estimate?invoice=lnbc..."

Response:

{
  "success": true,
  "data": {
    "feeSats": 5
  }
}

Get Activity Logs

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/logs?limit=20"

### Invoice Operations (admin or invoice role)

Create Lightning Invoice (BOLT11)

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"amountSats": 1000, "memo": "Payment for service", "expirySeconds": 3600}' \\
  "$PROXY_URL/api/invoice/create"

Response:

{
  "success": true,
  "data": {
    "encodedInvoice": "lnbc10u1p..."
  }
}

Create Spark Invoice

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"amount": 1000, "memo": "Spark payment"}' \\
  "$PROXY_URL/api/invoice/spark"

### Payment Operations (admin or pay-only role)

Pay Lightning Invoice

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"invoice": "lnbc10u1p...", "maxFeeSats": 10}' \\
  "$PROXY_URL/api/pay"

Response:

{
  "success": true,
  "data": {
    "id": "payment-id-123",
    "status": "LIGHTNING_PAYMENT_SUCCEEDED",
    "paymentPreimage": "abc123..."
  }
}

Transfer to Spark Address

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"receiverSparkAddress": "sp1p...", "amountSats": 1000}' \\
  "$PROXY_URL/api/transfer"

### L402 Paywall Operations (admin or pay-only role)

L402 lets you pay for API access with Lightning. The proxy handles the full flow automatically.

Pay L402 and Fetch Content

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"url": "https://lightningfaucet.com/api/l402/joke", "maxFeeSats": 50}' \\
  "$PROXY_URL/api/l402"

Response (immediate success):

{
  "success": true,
  "data": {
    "status": 200,
    "paid": true,
    "priceSats": 21,
    "preimage": "be2ebe7c...",
    "data": {"setup": "Why do programmers...", "punchline": "..."}
  }
}

Response (cached token reused):

{
  "success": true,
  "data": {
    "status": 200,
    "paid": false,
    "cached": true,
    "data": {"setup": "...", "punchline": "..."}
  }
}

Preview L402 Cost (any role)

Check what an L402 resource costs without paying:

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"url": "https://lightningfaucet.com/api/l402/joke"}' \\
  "$PROXY_URL/api/l402/preview"

Response:

{
  "success": true,
  "data": {
    "requires_payment": true,
    "invoice_amount_sats": 21,
    "invoice": "lnbc210n1p...",
    "macaroon": "AgELbGlnaHRuaW5n..."
  }
}

Handling Pending L402 Payments (IMPORTANT)

Lightning payments are asynchronous. If the preimage isn't available within ~7.5 seconds, the proxy returns a pending status:

{
  "success": true,
  "data": {
    "status": "pending",
    "pendingId": "a1b2c3d4...",
    "message": "Payment sent but preimage not yet available. Poll GET /api/l402/status?id=<pendingId> to complete.",
    "priceSats": 21
  }
}

You MUST handle this case. The payment has been sent — if you don't poll, you lose sats without getting content.

Poll for completion:

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/l402/status?id=a1b2c3d4..."

Recommended retry logic:

async function fetchL402(proxyUrl, token, targetUrl, maxFeeSats = 50) {
  const response = await fetch(\`${proxyUrl}/api/l402\`, {
    method: 'POST',
    headers: {
      'Authorization': \`Bearer ${token}\`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ url: targetUrl, maxFeeSats }),
  });

  const result = await response.json();

  if (result.data?.status === 'pending') {
    const pendingId = result.data.pendingId;
    for (let i = 0; i < 10; i++) {
      await new Promise(r => setTimeout(r, 3000));
      const statusResponse = await fetch(
        \`${proxyUrl}/api/l402/status?id=${pendingId}\`,
        { headers: { 'Authorization': \`Bearer ${token}\` } }
      );
      const statusResult = await statusResponse.json();
      if (statusResult.data?.status !== 'pending') {
        return statusResult;
      }
    }
    throw new Error('L402 payment timed out');
  }

  return result;
}

### Token Management (admin role only)

List Tokens

curl -H "Authorization: Bearer $TOKEN" \\
  "$PROXY_URL/api/tokens"

Create Token

curl -X POST -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"role": "invoice", "label": "merchant-bot", "maxTxSats": 5000, "dailyBudgetSats": 50000}' \\
  "$PROXY_URL/api/tokens"

Response includes the full token string — save it, shown only once:

{
  "success": true,
  "data": {
    "token": "sbp_abc123...",
    "role": "invoice",
    "label": "merchant-bot"
  }
}

Revoke Token

curl -X DELETE -H "Authorization: Bearer $TOKEN" \\
  -H "Content-Type: application/json" \\
  -d '{"token": "sbp_abc123..."}' \\
  "$PROXY_URL/api/tokens"

### Complete Agent Class (JavaScript)

export class SparkProxyAgent {
  #baseUrl;
  #token;

  constructor(baseUrl, token) {
    this.#baseUrl = baseUrl.replace(/\\/$/, '');
    this.#token = token;
  }

  async #request(method, path, body = null) {
    const options = {
      method,
      headers: {
        'Authorization': \`Bearer ${this.#token}\`,
        'Content-Type': 'application/json',
      },
    };
    if (body) {
      options.body = JSON.stringify(body);
    }

    const response = await fetch(\`${this.#baseUrl}${path}\`, options);
    const result = await response.json();

    if (!result.success) {
      throw new Error(result.error || 'Request failed');
    }
    return result.data;
  }

  async getBalance() {
    return this.#request('GET', '/api/balance');
  }

  async getInfo() {
    return this.#request('GET', '/api/info');
  }

  async getDepositAddress() {
    return this.#request('GET', '/api/deposit-address');
  }

  async getTransactions(limit = 10, offset = 0) {
    return this.#request('GET', \`/api/transactions?limit=${limit}&offset=${offset}\`);
  }

  async getFeeEstimate(invoice) {
    return this.#request('GET', \`/api/fee-estimate?invoice=${encodeURIComponent(invoice)}\`);
  }

  async createLightningInvoice(amountSats, memo = '', expirySeconds = 3600) {
    return this.#request('POST', '/api/invoice/create', {
      amountSats,
      memo,
      expirySeconds,
    });
  }

  async createSparkInvoice(amount, memo = '') {
    return this.#request('POST', '/api/invoice/spark', { amount, memo });
  }

  async payLightningInvoice(invoice, maxFeeSats = 10) {
    return this.#request('POST', '/api/pay', { invoice, maxFeeSats });
  }

  async transfer(receiverSparkAddress, amountSats) {
    return this.#request('POST', '/api/transfer', {
      receiverSparkAddress,
      amountSats,
    });
  }

  async previewL402(url) {
    return this.#request('POST', '/api/l402/preview', { url });
  }

  async fetchL402(url, options = {}) {
    const { method = 'GET', headers = {}, body, maxFeeSats = 50 } = options;

    const result = await this.#request('POST', '/api/l402', {
      url,
      method,
      headers,
      body,
      maxFeeSats,
    });

    // Handle pending status with polling
    if (result.status === 'pending') {
      const pendingId = result.pendingId;
      for (let i = 0; i < 10; i++) {
        await new Promise(r => setTimeout(r, 3000));
        const status = await this.#request('GET', \`/api/l402/status?id=${pendingId}\`);
        if (status.status !== 'pending') {
          return status;
        }
      }
      throw new Error('L402 payment timed out');
    }

    return result;
  }
}

// Usage
const agent = new SparkProxyAgent(
  process.env.PROXY_URL,
  process.env.PROXY_TOKEN
);

const balance = await agent.getBalance();
console.log('Balance:', balance.balance, 'sats');

const invoice = await agent.createLightningInvoice(1000, 'Test payment');
console.log('Invoice:', invoice.encodedInvoice);

const l402Result = await agent.fetchL402('https://lightningfaucet.com/api/l402/joke');
console.log('Joke:', l402Result.data);

### Environment Variables for Agent

PROXY_URL=https://your-deployment.vercel.app
PROXY_TOKEN=sbp_your_token_here

### Error Handling

All errors return:

{
  "success": false,
  "error": "Error message here"
}

Common errors:

401 Unauthorized — Invalid or missing bearer token
403 Forbidden — Token role doesn't permit this operation
400 Bad Request — Missing required parameters
429 Too Many Requests — Daily budget exceeded
500 Internal Server Error — Spark SDK or server error

### Spending Limits

The proxy enforces two types of limits:

Global limits (from env vars):

MAX_TRANSACTION_SATS — per-transaction cap
DAILY_BUDGET_SATS — daily total cap (resets midnight UTC)



Per-token limits (set when creating token):

maxTxSats — per-transaction cap for this token
dailyBudgetSats — daily cap for this token

The lower of global and per-token limits applies.

### Security Notes

Treat bearer tokens like passwords — they grant wallet access up to their role
Use the most restrictive role possible — if an agent only creates invoices, use invoice role
Set per-token spending limits — don't rely solely on global limits
Monitor logs — check /api/logs for unexpected activity
Revoke compromised tokens immediately — no need to move funds

### Resources

Proxy repo: https://github.com/echennells/sparkbtcbot-proxy
Direct SDK skill: https://github.com/echennells/sparkbtcbot-skill
Spark docs: https://docs.spark.money
L402 spec: https://docs.lightning.engineering/the-lightning-network/l402
## Trust
- Source: tencent
- Verification: Indexed source record
- Publisher: echennells
- Version: 1.1.0
## Source health
- Status: healthy
- Item download looks usable.
- Yavira can redirect you to the upstream package for this item.
- Health scope: item
- Reason: direct_download_ok
- Checked at: 2026-05-09T07:50:31.622Z
- Expires at: 2026-05-16T07:50:31.622Z
- Recommended action: Download for OpenClaw
## Links
- [Detail page](https://openagent3.xyz/skills/sparkbtcbot-proxy)
- [Send to Agent page](https://openagent3.xyz/skills/sparkbtcbot-proxy/agent)
- [JSON manifest](https://openagent3.xyz/skills/sparkbtcbot-proxy/agent.json)
- [Markdown brief](https://openagent3.xyz/skills/sparkbtcbot-proxy/agent.md)
- [Download page](https://openagent3.xyz/downloads/sparkbtcbot-proxy)