saylorinnovations.com
No description published for this endpoint.
OtherLiveeip155:8453Exactvia facilitator:thirdweb
Calls · 30d
2↑ 27%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 20 snapshots so far.
$15.76
Verified settled volume
1,657 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required to access this resource.",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"memo": "saylor:devkit:calc-compound",
"name": "USD Coin",
"note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2",
"facilitatorOnly": true,
"assetTransferMethod": "eip3009"
},
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"memo": "saylor:devkit:calc-compound",
"session": "eyJhcnRpY2xlSWQiOiJkZXZraXQ6Y2FsYy1jb21wb3VuZCIsInJlZmVyZW5jZSI6Ijc0aXM4MlJydEMxc051ZDJLUld1UXlQdXdpVWdrc1Y4cjJvV1RrUjJYWTlKIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTIwNzIwNTI0NTh9.JXQRzAvs4v93eJh7S3HZYcFxCSaJP9jKajuCxvo3mnA",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"reference": "74is82RrtC1sNud2KRWuQyPuwiUgksV8r2oWTkR2XY9J"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://saylorinnovations.com/api/calc/compound?principal=10000&rate=6.5&years=20&monthly_contribution=250",
"tags": [
"calc",
"compound",
"calculator"
],
"iconUrl": "https://saylorinnovations.com/og-image.jpg",
"mimeType": "application/json",
"description": "Compound interest calculator - final balance, interest earned and year-by-year growth for a principal, rate, years and optional monthly contribution",
"serviceName": "Saylor Innovations Dev Tools"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"rate": "6.5",
"years": "20",
"principal": "10000",
"monthly_contribution": "250"
}
},
"output": {
"type": "json",
"example": {
"years": 20,
"method": "monthly stepping with the nominal rate compounded n times per year; contributions added at month end; no tax or inflation",
"yearly": [
{
"year": 1,
"balance": 13760.73,
"interest": 760.73,
"contributions": 13000
},
{
"year": 2,
"balance": 17773.32,
"interest": 1773.32,
"contributions": 16000
},
{
"year": 3,
"balance": 22054.64,
"interest": 3054.64,
"contributions": 19000
},
{
"year": 4,
"balance": 26622.69,
"interest": 4622.69,
"contributions": 22000
},
{
"year": 5,
"balance": 31496.67,
"interest": 6496.67,
"contributions": 25000
},
{
"year": 6,
"balance": 36697.06,
"interest": 8697.06,
"contributions": 28000
},
{
"year": 7,
"balance": 42245.74,
"interest": 11245.74,
"contributions": 31000
},
{
"year": 8,
"balance": 48166.03,
"interest": 14166.03,
"contributions": 34000
},
{
"year": 9,
"balance": 54482.8,
"interest": 17482.8,
"contributions": 37000
},
{
"year": 10,
"balance": 61222.63,
"interest": 21222.63,
"contributions": 40000
},
{
"year": 11,
"balance": 68413.83,
"interest": 25413.83,
"contributions": 43000
},
{
"year": 12,
"balance": 76086.64,
"interest": 30086.64,
"contributions": 46000
},
{
"year": 13,
"balance": 84273.31,
"interest": 35273.31,
"contributions": 49000
},
{
"year": 14,
"balance": 93008.26,
"interest": 41008.26,
"contributions": 52000
},
{
"year": 15,
"balance": 102328.2,
"interest": 47328.2,
"contributions": 55000
},
{
"year": 16,
"balance": 112272.32,
"interest": 54272.32,
"contributions": 58000
},
{
"year": 17,
"balance": 122882.41,
"interest": 61882.41,
"contributions": 61000
},
{
"year": 18,
"balance": 134203.08,
"interest": 70203.08,
"contributions": 64000
},
{
"year": 19,
"balance": 146281.92,
"interest": 79281.92,
"contributions": 67000
},
{
"year": 20,
"balance": 159169.7,
"interest": 89169.7,
"contributions": 70000
}
],
"principal": 10000,
"final_balance": 159169.7,
"interest_earned": 89169.7,
"compounds_per_year": 12,
"annual_rate_percent": 6.5,
"total_contributions": 70000,
"monthly_contribution": 250,
"effective_annual_rate_percent": 6.6972
}
}
},
"schema": {
"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",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"principal",
"rate",
"years"
],
"properties": {
"rate": {
"type": "string",
"description": "Annual interest rate in percent"
},
"years": {
"type": "string",
"description": "Years to grow"
},
"principal": {
"type": "string",
"description": "Starting amount"
},
"monthly_contribution": {
"type": "string",
"description": "optional, default 0"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"required": [
"final_balance",
"total_contributions",
"interest_earned"
],
"properties": {
"years": {
"type": [
"number",
"null"
],
"description": "Years covered"
},
"method": {
"type": [
"string",
"null"
],
"description": "Method used"
},
"yearly": {
"type": "array",
"items": {
"type": "object",
"properties": {
"year": {
"type": "number",
"description": "Calendar year"
},
"balance": {
"type": "number",
"description": "Balance in whole units"
},
"interest": {
"type": "number"
},
"contributions": {
"type": "number"
}
}
},
"description": "Yearly values"
},
"principal": {
"type": [
"number",
"null"
],
"description": "Starting principal amount"
},
"checked_at": {
"type": [
"string",
"null"
],
"description": "Time the check was run (UTC)"
},
"final_balance": {
"type": "number",
"description": "Balance at the end of the period"
},
"interest_earned": {
"type": "number",
"description": "Total interest earned"
},
"compounds_per_year": {
"type": [
"number",
"null"
],
"description": "Compounds per year"
},
"annual_rate_percent": {
"type": [
"number",
"null"
],
"description": "Annual rate as a percentage"
},
"total_contributions": {
"type": "number",
"description": "Total contributions"
},
"monthly_contribution": {
"type": [
"number",
"null"
],
"description": "Monthly contribution"
},
"effective_annual_rate_percent": {
"type": "number",
"description": "Effective annual rate, as a percentage"
}
}
}
}
}
}
}
},
"method": "GET",
"example": {
"years": 20,
"method": "monthly stepping with the nominal rate compounded n times per year; contributions added at month end; no tax or inflation",
"yearly": [
{
"year": 1,
"balance": 13760.73,
"interest": 760.73,
"contributions": 13000
},
{
"year": 2,
"balance": 17773.32,
"interest": 1773.32,
"contributions": 16000
},
{
"year": 3,
"balance": 22054.64,
"interest": 3054.64,
"contributions": 19000
},
{
"year": 4,
"balance": 26622.69,
"interest": 4622.69,
"contributions": 22000
},
{
"year": 5,
"balance": 31496.67,
"interest": 6496.67,
"contributions": 25000
},
{
"year": 6,
"balance": 36697.06,
"interest": 8697.06,
"contributions": 28000
},
{
"year": 7,
"balance": 42245.74,
"interest": 11245.74,
"contributions": 31000
},
{
"year": 8,
"balance": 48166.03,
"interest": 14166.03,
"contributions": 34000
},
{
"year": 9,
"balance": 54482.8,
"interest": 17482.8,
"contributions": 37000
},
{
"year": 10,
"balance": 61222.63,
"interest": 21222.63,
"contributions": 40000
},
{
"year": 11,
"balance": 68413.83,
"interest": 25413.83,
"contributions": 43000
},
{
"year": 12,
"balance": 76086.64,
"interest": 30086.64,
"contributions": 46000
},
{
"year": 13,
"balance": 84273.31,
"interest": 35273.31,
"contributions": 49000
},
{
"year": 14,
"balance": 93008.26,
"interest": 41008.26,
"contributions": 52000
},
{
"year": 15,
"balance": 102328.2,
"interest": 47328.2,
"contributions": 55000
},
{
"year": 16,
"balance": 112272.32,
"interest": 54272.32,
"contributions": 58000
},
{
"year": 17,
"balance": 122882.41,
"interest": 61882.41,
"contributions": 61000
},
{
"year": 18,
"balance": 134203.08,
"interest": 70203.08,
"contributions": 64000
},
{
"year": 19,
"balance": 146281.92,
"interest": 79281.92,
"contributions": 67000
},
{
"year": 20,
"balance": 159169.7,
"interest": 89169.7,
"contributions": 70000
}
],
"principal": 10000,
"final_balance": 159169.7,
"interest_earned": 89169.7,
"compounds_per_year": 12,
"annual_rate_percent": 6.5,
"total_contributions": 70000,
"monthly_contribution": 250,
"effective_annual_rate_percent": 6.6972
},
"license": "LicenseRef-Saylor-Agent-Use-1.0",
"mimeType": "application/json",
"freshness": "computed on every request; input is not stored",
"freeSample": "https://saylorinnovations.com/api/calc/compound/free",
"tokenCount": null,
"inputSchema": {
"rate": "Annual interest rate in percent",
"years": "Years to grow",
"principal": "Starting amount",
"compounds_per_year": "optional, default 12",
"monthly_contribution": "optional, default 0"
},
"serviceName": "Saylor Innovations Dev Tools",
"instructions": "STANDARD PATH (works with stock x402 clients): send payload.transaction — a base64 partially-signed Solana transaction — and we route verify/settle through an x402 facilitator that sponsors the fee and submits it. Include the chosen accepts entry as \"accepted\" so we can match terms. ALTERNATIVE PATH (no facilitator): Pick ONE entry from accepts and use the reference and session from THAT entry — each asset has its own. USDC or USDT: send an SPL transfer of the exact amount. Native SOL (asset=So11111111111111111111111111111111111111112, extra.native=true): send that many lamports with a system transfer. Either way include extra.reference as a read-only account (Solana Pay style), then retry with PAYMENT-SIGNATURE: base64({x402Version:2, payload:{session, reference}}). If your client cannot attach a reference, send payload.signature instead (USDC only). SOL amounts are quoted live and expire in 120s; stablecoins do not move. The facilitator path verifies and settles in this request. Only the alternative self-submitted Solana path needs retries while the transfer is indexed (typically 3-4 attempts over 10-20s). On that path, a 402 saying \"payment not found on-chain yet\" means keep retrying.",
"outputSchema": {
"type": "object",
"required": [
"final_balance",
"total_contributions",
"interest_earned"
],
"properties": {
"yearly": {
"type": "array",
"items": {
"type": "object",
"properties": {
"year": {
"type": "number"
},
"balance": {
"type": "number"
},
"interest": {
"type": "number"
},
"contributions": {
"type": "number"
}
}
}
},
"final_balance": {
"type": "number"
},
"interest_earned": {
"type": "number"
},
"total_contributions": {
"type": "number"
},
"effective_annual_rate_percent": {
"type": "number"
}
}
},
"noPathTemplate": true,
"settlementModes": [
"facilitator-transaction",
"self-submitted-reference"
],
"typicalLatencyMs": 20
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0xA2A8…fc8aa. The signed payment is good for 2 minutes.
- Paid to
- 0xA2A8…fc8aa
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 10000 smallest units
- Returns
- application/json
10000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 7LSjfr…Xacy7
- Token contract
- EPjFWd…TDt1v
- Payment window
- 2 minutes
- Returns
- application/json
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://saylorinnovations.com/api/calc/compound",
"description": "",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "https://saylorinnovations.com/api/calc/compound",
"description": "",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
}
]Provenance
- Seen in the source catalog
- 2026-10-16 01:33Z
- Last indexed by Roundhouse
- 2026-10-25 17:47Z
- Last enriched (probe, favicon, geo)
- 2026-10-15 13:45Z
- x402 version
- 1
- Max timeout
- 120s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 20 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service saylorinnovations.com and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=saylorinnovations.com' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://saylorinnovations.com/api/calc/compound, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.