Bankr Dev - API Workflow

API Workflow

Complete reference for the asynchronous job pattern used by the Bankr Agent API.

Core Pattern: Submit-Poll-Complete

1. SUBMIT  -> POST /agent/prompt   -> Get jobId + threadId
2. POLL    -> GET /agent/job/{id}  -> Check status every 2s
3. COMPLETE -> Terminal status      -> Process response + richData

Endpoints

POST /agent/prompt

const response = await fetch(`${API_URL}/agent/prompt`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({
    prompt: "What is my ETH balance?",
    threadId: "thr_XYZ789", // optional: continue conversation
  }),
});
// → { success: true, jobId: "job_abc123", threadId: "thr_XYZ789", status: "pending" }

Request fields:

• prompt (string, required): Natural language prompt (max 10,000 chars)
• threadId (string, optional): Continue existing conversation. Omit for new thread.

GET /agent/job/{jobId}

const status = await fetch(`${API_URL}/agent/job/${jobId}`, {
  headers: { "x-api-key": API_KEY },
});

POST /agent/job/{jobId}/cancel

const cancel = await fetch(`${API_URL}/agent/job/${jobId}/cancel`, {
  method: "POST",
  headers: { "x-api-key": API_KEY, "Content-Type": "application/json" },
});

Job Status States

Response Fields

Standard (all states)

• success, jobId, threadId, status, prompt, createdAt

Completed

• response — Natural language text
• richData — Array of structured data (charts, social cards)
• transactions — Array of executed transactions
• completedAt, processingTime

Processing

• statusUpdates — Array of { message, timestamp }
• startedAt, cancellable

Failed

• error — Error message
• completedAt

Cancelled

• cancelledAt

Polling Implementation

async function waitForCompletion(
  jobId: string,
  onProgress?: (message: string) => void
): Promise<JobStatusResponse> {
  const POLL_INTERVAL = 2000; // 2 seconds
  const MAX_POLLS = 150;      // 5 minutes max
  let lastUpdateCount = 0;

  for (let i = 0; i < MAX_POLLS; i++) {
    const status = await getJobStatus(jobId);

    // Report new status updates
    if (onProgress && status.statusUpdates) {
      for (let j = lastUpdateCount; j < status.statusUpdates.length; j++) {
        onProgress(status.statusUpdates[j].message);
      }
      lastUpdateCount = status.statusUpdates.length;
    }

    // Terminal states
    if (["completed", "failed", "cancelled"].includes(status.status)) {
      return status;
    }

    await new Promise((r) => setTimeout(r, POLL_INTERVAL));
  }

  throw new Error("Job timed out");
}

Polling Best Practices

• 2-second interval — don't poll faster
• 5-minute timeout — suggest cancellation after that
• Track shown updates — only display new statusUpdates
• Handle network errors — retry with backoff on fetch failures

Conversation Threads

// Start a conversation
const first = await submitPrompt("What is the price of ETH?");
const threadId = first.threadId;

// Continue the conversation (agent remembers context)
const second = await submitPrompt("And what about BTC?", threadId);

// Each response includes the same threadId

Rich Data

Completed jobs may include richData:

type RichData = {
  type?: string;          // "social-card", "chart", etc.
  [key: string]: unknown;
};

The response field always has a text summary regardless of richData content.

Error Handling

// Handle rate limits
if (response.status === 429) {
  const error = await response.json();
  const waitMs = error.resetAt - Date.now();
  console.log(`Rate limited. Resets in ${Math.ceil(waitMs / 60000)} minutes`);
}

Complete Example

import { submitPrompt, waitForCompletion } from "./bankr-client";

async function main() {
  // Submit
  const { jobId } = await submitPrompt("Swap 0.1 ETH for USDC on Base");
  console.log(`Job: ${jobId}`);

  // Poll with progress
  const result = await waitForCompletion(jobId, (msg) => {
    console.log(`Progress: ${msg}`);
  });

  // Handle result
  if (result.status === "completed") {
    console.log(result.response);
    for (const tx of result.transactions || []) {
      console.log(`Transaction: ${tx.type}`);
    }
  } else if (result.status === "failed") {
    console.error(`Failed: ${result.error}`);
  }
}

Related Skills

• bankr-api-basics - Endpoint documentation and TypeScript interfaces
• bankr-client-patterns - Reusable client code with execute() helper
• bankr-sign-submit-api - Synchronous endpoints (no polling needed)