Grow a principal by simple or compound interest over a number of years
Grow a principal by simple or compound interest over a number of years. Compound interest uses compoundsPerYear compounding periods (default 12, monthly).
Answeringour last check, 2026-09-24
1 of 1checks answered this week
471 msmedian answer time
$0.004listed price per call
$0.004price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://finance.openverbs.com/v1/interest
| Category | Everything else |
|---|---|
| Provider host | finance.openverbs.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.004 | 471 ms |
Example input (from the provider)
{
"body": {
"annualRatePercent": 1,
"compoundsPerYear": 1,
"method": "simple",
"principal": 1,
"years": 1
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"annualRatePercent": {
"description": "Annual interest rate as a percentage.",
"maximum": 1000,
"minimum": 0,
"type": "number"
},
"compoundsPerYear": {
"description": "Compounding periods per year (compound only). Default 12.",
"maximum": 365,
"minimum": 1,
"type": "integer"
},
"method": {
"description": "Interest method. Default compound.",
"enum": [
"simple",
"compound"
],
"type": "string"
},
"principal": {
"description": "Starting principal.",
"maximum": 1000000000000000,
"minimum": 0,
"type": "number"
},
"years": {
"description": "Number of years.",
"maximum": 1000,
"minimum": 0,
"type": "number"
}
},
"required": [
"principal",
"annualRatePercent",
"years"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}