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

Status	Description	Action
pending	Job queued, not started	Keep polling
processing	Job running	Keep polling, show statusUpdates
completed	Finished successfully	Read response and richData
failed	Encountered error	Check error field
cancelled	Was cancelled	No further action

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

Status	Error	Resolution
400	Invalid request / Prompt too long	Check input (max 10,000 chars)
401	Authentication required	Check API key
403	Agent API not enabled	Enable at bankr.bot/api
404	Job not found	Check jobId is correct
429	Rate limit exceeded	Wait for resetAt timestamp

// 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)