Summarize text

Returns JSON with a concise summary of the plain text you send (up to 20,000 characters): one short paragraph and key bullet points, written by IBM Granite 4.0 Micro on Workers AI.

Use this when you need to summarize text such as an article, notes or a transcript into a short summary.

Do not use for URLs or PDFs (extract the text first), exact quotes or citations.

Price: 0.008 USDC per call (x402, eip155:8453). Typical response time: 8000 ms (p95).

Call it over HTTP (x402)

POST https://x402-gateway.blackwoodstate8.workers.dev/v1/summarize. A request without payment gets 402 Payment Required with the PAYMENT-REQUIRED header; any x402 client signs an EIP-3009 authorization and retries with PAYMENT-SIGNATURE (or X-PAYMENT). Invalid input is answered with 400 and not charged.

curl -i -X POST https://x402-gateway.blackwoodstate8.workers.dev/v1/summarize -H 'content-type: application/json' -d '{"text":"The x402 protocol turns the old HTTP 402 Payment Required status into a working payment step. When a client asks for a paid resource, the server answers 402 with machine-readable terms: price, network, asset and the address that receives the money. The client, often an AI agent, signs a USDC authorization and sends the request again. A facilitator checks the signature, settles the payment on-chain and the server returns the data. Sellers never handle cards or accounts, and buyers pay only for the calls they make.","maxBullets":3}'

Call it over MCP

Streamable HTTP at https://x402-gateway.blackwoodstate8.workers.dev/mcp, tool blackwood_text_summarize. Payment goes in _meta["x402/payment"]; without it the tool returns the payment requirements.

Input

Example:

{
  "text": "The x402 protocol turns the old HTTP 402 Payment Required status into a working payment step. When a client asks for a paid resource, the server answers 402 with machine-readable terms: price, network, asset and the address that receives the money. The client, often an AI agent, signs a USDC authorization and sends the request again. A facilitator checks the signature, settles the payment on-chain and the server returns the data. Sellers never handle cards or accounts, and buyers pay only for the calls they make.",
  "maxBullets": 3
}

Output

Real example:

{
  "summary": "The x402 protocol updates the outdated HTTP 402 Payment Required status to enable a functional payment process. When a client requests a paid resource, the server responds with 402, including machine-readable details like price, network, asset, and the receiving address. The client, typically an AI agent, signs a USDC authorization and resubmits the request. A facilitator verifies the signature, processes the payment on-chain, and the server delivers the data. Sellers never manage cards or accounts, and buyers only pay for the actual calls they make.",
  "bullets": [
    "x402 protocol replaces HTTP 402 Payment Required with a functional payment step",
    "Server sends 402 with machine-readable terms (price, network, asset, receiving address) to the client",
    "AI agent signs USDC authorization, facilitator verifies and processes payment on-chain"
  ],
  "model": "@cf/ibm-granite/granite-4.0-h-micro",
  "inputChars": 518,
  "usage": {
    "promptTokens": 200,
    "completionTokens": 173
  }
}

{
  "type": "object",
  "properties": {
    "summary": {
      "type": "string"
    },
    "bullets": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "model": {
      "type": "string"
    },
    "inputChars": {
      "type": "number"
    },
    "usage": {
      "type": "object",
      "properties": {
        "promptTokens": {
          "type": [
            "number",
            "null"
          ]
        },
        "completionTokens": {
          "type": [
            "number",
            "null"
          ]
        }
      },
      "required": [
        "promptTokens",
        "completionTokens"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "summary",
    "bullets",
    "model",
    "inputChars",
    "usage"
  ],
  "additionalProperties": false
}

More

Free schema and example: GET https://x402-gateway.blackwoodstate8.workers.dev/v1/summarize. OpenAPI 3.1 · llms.txt · All services