# US Overnight Rates (SOFR & EFFR)

> US Overnight Rates (SOFR & EFFR) is a paid API for AI agents from us-rates.use.x402atlas.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Returns the latest SOFR and EFFR overnight interest rate benchmarks, including rate values, volumes, and Fed policy target range.

## Facts

- Endpoint: GET https://us-rates.use.x402atlas.com/latest?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-overnight-rates-sofr-effr-17fda9d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XgdF9FKe33twownQE1t9I

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-overnight-rates-sofr-effr-17fda9d1
```

Example prompt: What are the latest SOFR and EFFR overnight rate values, volumes, and the Fed's target range as of today?

## When to prefer this

Choose this endpoint when you need official US overnight benchmark rates (SOFR and EFFR) in a single call, including volume and Fed target range context, without building your own NY Fed data integration. It is particularly useful for automated treasury workflows, loan pricing, or policy monitoring that requires programmatic, pay-per-call access to the latest published reference rates.

## Known failure modes

- Rate not yet published for the current business day (publication lag from NY Fed)
- Missing data on holidays or non-business days causing gaps in observations
- Payment failure or insufficient USDC balance blocking access
- Stale data if NY Fed revises a prior observation after initial publication
- Network timeout if upstream source is temporarily unavailable

## How this service works

US overnight interest rates — latest SOFR secured financing and EFFR effective federal funds benchmarks, volumes and policy target range for dollar borrowing-cost comparisons. x402Atlas is not affiliated with the New York Fed. The New York Fed does not sanction, endorse, or recommend any products or services offered by x402Atlas.

## Output

Returns a JSON object containing one or more rate series (SOFR and/or EFFR), each with the latest observation date, rate value in percent per annum (e.g. 5.3 means 5.3%), USD trading volume in billions, Fed policy target lower and upper bounds, a revision indicator, and associated metadata including source attribution, disclaimer notices, and schema version.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "operation",
      "schema_version",
      "source",
      "source_url",
      "terms_url",
      "disclaimer",
      "notice",
      "changes",
      "retrieved_at",
      "series",
      "warnings"
     ],
     "properties": {
      "notice": {
       "type": "string",
       "description": "Reference-rate redistribution notice."
      },
      "series": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "alias",
         "source_id",
         "name",
         "frequency",
         "unit",
         "observations"
        ],
        "properties": {
         "name": {
          "type": "string",
          "description": "Official reference rate name."
         },
         "unit": {
          "enum": [
           "percent_per_annum"
          ],
          "type": "string",
          "description": "Annual percentage rate; 5 means five percent, not 0.05."
         },
         "alias": {
          "enum": [
           "sofr",
           "effr"
          ],
          "type": "string",
          "description": "sofr is secured overnight financing; effr is effective federal funds."
         },
         "frequency": {
          "enum": [
           "business_daily"
          ],
          "type": "string",
          "description": "Business-day series; holidays and missing publications can create gaps."
         },
         "source_id": {
          "type": "string",
          "description": "Original source rate type: SOFR or EFFR."
         },
         "observations": {
          "type": "array",
          "items": {
           "type": "object",
           "required": [
            "date",
            "value",
            "volume_usd_billions",
            "target_lower_percent",
      
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-overnight-rates-sofr-effr-17fda9d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from us-rates.use.x402atlas.com](https://www.zero.xyz/host/us-rates.use.x402atlas.com/llms.txt)