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.
Try it — live request, no key required
GETapi.apiverve.com/v1/savingsbonds
VerificationFormat
No key required to try it. Get a key to use it in your app.
{
"status": "ok",
"error": null,
"data": {
// I-Bond Rates response payload
}
}Code examples — ready to paste, with real parameters
curl "https://api.apiverve.com/v1/savingsbonds?period=value" \
-H "x-api-key: YOUR_API_KEY"Replace
YOUR_API_KEY with your key.Full reference in the docs →
Access methods
Call it however you build.
One endpoint, many ways in — REST with JSON, XML, YAML, and CSV, plus GraphQL and an MCP interface for AI agents.
JSON
Default REST response
XML
Markup format
YAML
Human-readable
CSV
Tabular export
Beta
GraphQL
Query language
New
MCP
For AI agents
Zero-code embed
Drop it into any site.
Add an interactive form for I-Bond Rates with a single snippet — no backend, no keys in your markup.
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What does the I-Bond Rates API do?
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.
How do I authenticate I-Bond Rates API requests?
Pass your API key in the x-api-key header over HTTPS. One key works across all 300+ APIVerve APIs — there are no per-endpoint credentials.
How much does the I-Bond Rates API cost?
Each call spends 1 credit from your shared pool. The free tier includes 100 credits every month, and paid plans add more headroom.
How fast is the I-Bond Rates API?
Typical responses return in around 467 ms (p50), served from 24 regions under a 99.9% uptime SLA.
What response formats does the I-Bond Rates API support?
JSON by default, plus XML and YAML via the format parameter. GraphQL and an MCP interface for AI agents are available across the catalog.
What HTTP method does the I-Bond Rates API use?
GET over HTTPS, following standard REST conventions with a consistent { status, error, data } response envelope.