I-Bond Rates API
I-Bond Rates provides current and historical interest rates for US Series I Savings Bonds. I-Bonds are inflation-protected savings bonds with a composite rate made up of a fixed rate plus an inflation rate that adjusts every 6 months.
The I-Bond Rates API provides reliable and fast access to i-bond rates data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.
To use I-Bond Rates, you need an API key. You can get one by creating a free account and visiting your dashboard.
GET Endpoint
https://api.apiverve.com/v1/savingsbondsCode Examples
Here are examples of how to call the I-Bond Rates API in different programming languages:
curl -X GET \
"https://api.apiverve.com/v1/savingsbonds?period=2024-11" \
-H "X-API-Key: your_api_key_here"const response = await fetch('https://api.apiverve.com/v1/savingsbonds?period=2024-11', {
method: 'GET',
headers: {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
});
const data = await response.json();
console.log(data);import requests
headers = {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
response = requests.get('https://api.apiverve.com/v1/savingsbonds?period=2024-11', headers=headers)
data = response.json()
print(data)const https = require('https');
const url = require('url');
const options = {
method: 'GET',
headers: {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
};
const req = https.request('https://api.apiverve.com/v1/savingsbonds?period=2024-11', options, (res) => {
let data = '';
res.on('data', (chunk) => data += chunk);
res.on('end', () => console.log(JSON.parse(data)));
});
req.end();<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/savingsbonds?period=2024-11');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'X-API-Key: your_api_key_here',
'Content-Type: application/json'
]);
$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);
print_r($data);
?>package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/savingsbonds?period=2024-11", nil)
req.Header.Set("X-API-Key", "your_api_key_here")
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require 'net/http'
require 'json'
uri = URI('https://api.apiverve.com/v1/savingsbonds?period=2024-11')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
request = Net::HTTP::Get.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'
response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
class Program
{
static async Task Main(string[] args)
{
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key_here");
var response = await client.GetAsync("https://api.apiverve.com/v1/savingsbonds?period=2024-11");
response.EnsureSuccessStatusCode();
var responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine(responseBody);
}
}Authentication
The I-Bond Rates API requires authentication via API key. Include your API key in the request header:
X-API-Key: your_api_key_hereInteractive API Playground
Test the I-Bond Rates API directly in your browser with live requests and responses.
Parameters
The following parameters are available for the I-Bond Rates API:
Get I-Bond Rates
| Parameter | Type | Required | Description | Default | Example |
|---|---|---|---|---|---|
periodPremium | string | optional | Specific issue period to lookup (YYYY-MM format, e.g., 2024-11). Omit for current rates. | - |
Response
The I-Bond Rates API returns responses in JSON, XML, YAML, and CSV formats:
Example Responses
{
"status": "ok",
"error": null,
"data": {
"iBonds": {
"currentRate": 5.27,
"fixedRate": 1.3,
"inflationRate": 1.97,
"purchaseLimit": 10000
},
"eeBonds": {
"currentRate": 2.7,
"guaranteedDoubling": "20 years (guaranteed to double in value)",
"purchaseLimit": 10000
},
"recommendation": "I Bonds",
"recommendationReason": "I Bonds currently offer 5.27% vs EE Bonds at 2.70%",
"nextRateChange": "2024-05-01",
"lastUpdated": "2024-02-01T00:00:00.000Z"
}
}<?xml version="1.0" encoding="UTF-8"?>
<response>
<status>ok</status>
<error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
<data>
<iBonds>
<currentRate>5.27</currentRate>
<fixedRate>1.3</fixedRate>
<inflationRate>1.97</inflationRate>
<purchaseLimit>10000</purchaseLimit>
</iBonds>
<eeBonds>
<currentRate>2.7</currentRate>
<guaranteedDoubling>20 years (guaranteed to double in value)</guaranteedDoubling>
<purchaseLimit>10000</purchaseLimit>
</eeBonds>
<recommendation>I Bonds</recommendation>
<recommendationReason>I Bonds currently offer 5.27% vs EE Bonds at 2.70%</recommendationReason>
<nextRateChange>2024-05-01</nextRateChange>
<lastUpdated>2024-02-01T00:00:00.000Z</lastUpdated>
</data>
</response>
status: ok
error: null
data:
iBonds:
currentRate: 5.27
fixedRate: 1.3
inflationRate: 1.97
purchaseLimit: 10000
eeBonds:
currentRate: 2.7
guaranteedDoubling: 20 years (guaranteed to double in value)
purchaseLimit: 10000
recommendation: I Bonds
recommendationReason: I Bonds currently offer 5.27% vs EE Bonds at 2.70%
nextRateChange: '2024-05-01'
lastUpdated: '2024-02-01T00:00:00.000Z'
| key | value |
|---|---|
| iBonds | {currentRate:5.27,fixedRate:1.3,inflationRate:1.97,purchaseLimit:10000} |
| eeBonds | {currentRate:2.7,guaranteedDoubling:20 years (guaranteed to double in value),purchaseLimit:10000} |
| recommendation | I Bonds |
| recommendationReason | I Bonds currently offer 5.27% vs EE Bonds at 2.70% |
| nextRateChange | 2024-05-01 |
| lastUpdated | 2024-02-01T00:00:00.000Z |
Response Structure
All API responses follow a consistent structure with the following fields:
| Field | Type | Description | Example |
|---|---|---|---|
status | string | Indicates whether the request was successful ("ok") or failed ("error") | ok |
error | string | null | Contains error message if status is "error", otherwise null | null |
data | object | null | Contains the API response data if successful, otherwise null | {...} |
Learn more about response formats →
Response Data Fields
When the request is successful, the data object contains the following fields:
| Field | Type | Sample Value | Description |
|---|---|---|---|
iBonds | object | - | |
â”” currentRate | number | - | |
â”” fixedRate | number | Fixed rate component (set at purchase, never changes) | |
â”” inflationRate | number | Inflation rate component (adjusts every 6 months) | |
â”” purchaseLimit | number | Annual electronic purchase limit per person in dollars | |
eeBonds | object | - | |
â”” currentRate | number | - | |
â”” guaranteedDoubling | string | - | |
â”” purchaseLimit | number | Annual electronic purchase limit per person in dollars | |
recommendation | string | - | |
recommendationReason | string | - | |
nextRateChange | string | Date of next scheduled I-Bond rate announcement | |
lastUpdated | string | ISO 8601 timestamp of last data refresh |
Headers
Required and optional headers for I-Bond Rates API requests:
| Header Name | Required | Example Value | Description |
|---|---|---|---|
X-API-Key | required | your_api_key_here | Your APIVerve API key. Found in your dashboard under API Keys. |
Accept | optional | application/json | Specify response format: application/json (default), application/xml, or application/yaml |
User-Agent | optional | MyApp/1.0 | Identifies your application for analytics and debugging purposes |
X-Request-ID | optional | req_123456789 | Custom request identifier for tracking and debugging requests |
Cache-Control | optional | no-cache | Control caching behavior for the request and response |
GraphQL AccessALPHA
Access I-Bond Rates through GraphQL to combine it with other API calls in a single request. Query only the i-bond rates data you need with precise field selection, and orchestrate complex data fetching workflows.
Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.
POST https://api.apiverve.com/v1/graphqlquery {
savingsbonds(
input: {
period: "2024-11"
}
) {
iBonds {
currentRate
fixedRate
inflationRate
purchaseLimit
}
eeBonds {
currentRate
guaranteedDoubling
purchaseLimit
}
recommendation
recommendationReason
nextRateChange
lastUpdated
}
}Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.
CORS Support
The I-Bond Rates API supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call I-Bond Rates directly from browser-based applications without proxy servers.
| CORS Header | Value | Description |
|---|---|---|
Access-Control-Allow-Origin | * | Accepts requests from any origin |
Access-Control-Allow-Methods | * | Accepts any HTTP method |
Access-Control-Allow-Headers | * | Accepts any request headers |
Browser Usage: You can call I-Bond Rates directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.
Rate Limiting
I-Bond Rates API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all I-Bond Rates users.
| Plan | Rate Limit | Description |
|---|---|---|
| Free | 5 requests/min | Hard rate limit enforced - exceeding will return 429 errors |
| Starter | No Limit | Production ready - standard traffic priority |
| Pro | No Limit | Production ready - preferred traffic priority |
| Mega | No Limit | Production ready - highest traffic priority |
Learn more about rate limiting →
Rate Limit Headers
When rate limits apply, each I-Bond Rates response includes headers to help you track your usage:
| Header | Description |
|---|---|
X-RateLimit-Limit | Maximum number of requests allowed per time window |
X-RateLimit-Remaining | Number of requests remaining in the current window |
X-RateLimit-Reset | Unix timestamp when the rate limit window resets |
Handling Rate Limits
Free Plan: When you exceed your rate limit, I-Bond Rates returns a 429 Too Many Requests status code. Your application should implement appropriate backoff logic to handle this gracefully.
Paid Plans: No rate limiting or throttling applied. All paid plans (Starter, Pro, Mega) are production-ready.
Best Practices for I-Bond Rates:
- Monitor the rate limit headers to track your I-Bond Rates usage (Free plan only)
- Cache i-bond rates responses where appropriate to reduce API calls
- Upgrade to Pro or Mega for guaranteed no-throttle I-Bond Rates performance
Note: I-Bond Rates rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using I-Bond Rates on Free tier.
Error Codes
The I-Bond Rates API uses standard HTTP status codes to indicate success or failure:
| Code | Message | Description | Solution |
|---|---|---|---|
200 | OK | Request successful, data returned | No action needed - request was successful |
400 | Bad Request | Invalid request parameters or malformed request | Check required parameters and ensure values match expected formats |
401 | Unauthorized | Missing or invalid API key | Include x-api-key header with valid API key from dashboard |
403 | Forbidden | API key lacks permission or insufficient credits | Check credit balance in dashboard or upgrade plan |
429 | Too Many Requests | Rate limit exceeded (Free: 5 req/min) | Implement request throttling or upgrade to paid plan |
500 | Internal Server Error | Server error occurred | Retry request after a few seconds, contact support if persists |
503 | Service Unavailable | API temporarily unavailable | Wait and retry, check status page for maintenance updates |
Learn more about error handling →
Need help? Contact support with your X-Request-ID for assistance.
Integrate I-Bond Rates with SDKs
Get started quickly with official I-Bond Rates SDKs for your preferred language. Each library handles authentication, request formatting, and error handling automatically.
Available for Node.js, Python, C#/.NET, and Android/Java. All SDKs are open source and regularly updated.
Integrate I-Bond Rates with No-Code API Tools
Connect the I-Bond Rates API to your favorite automation platform without writing code. Build workflows that leverage i-bond rates data across thousands of apps.





All platforms use your same API key to access I-Bond Rates. Visit our integrations hub for step-by-step setup guides.
Frequently Asked Questions
How do I get an API key for I-Bond Rates?
How many credits does I-Bond Rates cost?
Each successful I-Bond Rates API call consumes credits based on plan tier. Check the pricing section above for the exact credit cost. Failed requests and errors don't consume credits, so you only pay for successful i-bond rates lookups.
Can I use I-Bond Rates in production?
The free plan is for testing and development only. For production use of I-Bond Rates, upgrade to a paid plan (Starter, Pro, or Mega) which includes commercial use rights, no attribution requirements, and guaranteed uptime SLAs. All paid plans are production-ready.
Can I use I-Bond Rates from a browser?
What happens if I exceed my I-Bond Rates credit limit?
When you reach your monthly credit limit, I-Bond Rates API requests will return an error until you upgrade your plan or wait for the next billing cycle. You'll receive notifications at 80% and 95% usage to give you time to upgrade if needed.



