saylorinnovations.com
No description published for this endpoint.
OtherLiveeip155:8453Exactvia facilitator:thirdweb
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 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-amortization",
"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-amortization",
"session": "eyJhcnRpY2xlSWQiOiJkZXZraXQ6Y2FsYy1hbW9ydGl6YXRpb24iLCJyZWZlcmVuY2UiOiI3MkhjMXlwRlppWVRacVNQekdwamozTmVTZWJMS21mUHoxYlpMcW04RVgycSIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyMDcyMDUyNDc1fQ.zy-0heLCPa2B1xxmpm7eZYPtXcZETx-lAn1DjXZQHNs",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"reference": "72Hc1ypFZiYTZqSPzGpjj3NeSebLKmfPz1bZLqm8EX2q"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://saylorinnovations.com/api/calc/amortization?principal=300000&rate=6.75&years=30&extra_payment=200",
"tags": [
"calc",
"amortization",
"calculator"
],
"iconUrl": "https://saylorinnovations.com/og-image.jpg",
"mimeType": "application/json",
"description": "Loan amortization schedule calculator - monthly payment, total interest, payoff time and first 12 payments, with savings from an extra monthly payment",
"serviceName": "Saylor Innovations Dev Tools"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"rate": "6.75",
"years": "30",
"principal": "300000",
"extra_payment": "200"
}
},
"output": {
"type": "json",
"example": {
"method": "fixed-rate level payment; monthly rate = annual rate / 12; excludes taxes, insurance and fees",
"yearly": [
{
"year": 1,
"balance": 294327.1,
"interest_paid": 20076.63,
"principal_paid": 5672.9
},
{
"year": 2,
"balance": 288259.2,
"interest_paid": 19681.63,
"principal_paid": 6067.9
},
{
"year": 3,
"balance": 281768.81,
"interest_paid": 19259.14,
"principal_paid": 6490.39
},
{
"year": 4,
"balance": 274826.5,
"interest_paid": 18807.23,
"principal_paid": 6942.3
},
{
"year": 5,
"balance": 267400.82,
"interest_paid": 18323.85,
"principal_paid": 7425.68
},
{
"year": 6,
"balance": 259458.1,
"interest_paid": 17806.81,
"principal_paid": 7942.72
},
{
"year": 7,
"balance": 250962.35,
"interest_paid": 17253.78,
"principal_paid": 8495.75
},
{
"year": 8,
"balance": 241875.05,
"interest_paid": 16662.24,
"principal_paid": 9087.29
},
{
"year": 9,
"balance": 232155.03,
"interest_paid": 16029.51,
"principal_paid": 9720.02
},
{
"year": 10,
"balance": 221758.22,
"interest_paid": 15352.72,
"principal_paid": 10396.81
},
{
"year": 11,
"balance": 210637.5,
"interest_paid": 14628.81,
"principal_paid": 11120.72
},
{
"year": 12,
"balance": 198742.47,
"interest_paid": 13854.5,
"principal_paid": 11895.03
},
{
"year": 13,
"balance": 186019.22,
"interest_paid": 13026.27,
"principal_paid": 12723.26
},
{
"year": 14,
"balance": 172410.07,
"interest_paid": 12140.38,
"principal_paid": 13609.15
},
{
"year": 15,
"balance": 157853.34,
"interest_paid": 11192.8,
"principal_paid": 14556.73
},
{
"year": 16,
"balance": 142283.05,
"interest_paid": 10179.25,
"principal_paid": 15570.28
},
{
"year": 17,
"balance": 125628.65,
"interest_paid": 9095.12,
"principal_paid": 16654.41
},
{
"year": 18,
"balance": 107814.62,
"interest_paid": 7935.51,
"principal_paid": 17814.02
},
{
"year": 19,
"balance": 88760.25,
"interest_paid": 6695.16,
"principal_paid": 19054.38
},
{
"year": 20,
"balance": 68379.16,
"interest_paid": 5368.44,
"principal_paid": 20381.09
},
{
"year": 21,
"balance": 46578.97,
"interest_paid": 3949.35,
"principal_paid": 21800.19
},
{
"year": 22,
"balance": 23260.88,
"interest_paid": 2431.44,
"principal_paid": 23318.09
},
{
"year": 23,
"balance": 0,
"interest_paid": 807.85,
"principal_paid": 23260.88
}
],
"principal": 300000,
"total_paid": 590558.43,
"term_months": 360,
"extra_payment": 200,
"payoff_months": 276,
"total_interest": 290558.43,
"monthly_payment": 1945.79,
"first_12_payments": [
{
"month": 1,
"balance": 299541.71,
"payment": 2145.79,
"interest": 1687.5,
"principal": 458.29
},
{
"month": 2,
"balance": 299080.83,
"payment": 2145.79,
"interest": 1684.92,
"principal": 460.87
},
{
"month": 3,
"balance": 298617.37,
"payment": 2145.79,
"interest": 1682.33,
"principal": 463.46
},
{
"month": 4,
"balance": 298151.3,
"payment": 2145.79,
"interest": 1679.72,
"principal": 466.07
},
{
"month": 5,
"balance": 297682.6,
"payment": 2145.79,
"interest": 1677.1,
"principal": 468.69
},
{
"month": 6,
"balance": 297211.27,
"payment": 2145.79,
"interest": 1674.46,
"principal": 471.33
},
{
"month": 7,
"balance": 296737.29,
"payment": 2145.79,
"interest": 1671.81,
"principal": 473.98
},
{
"month": 8,
"balance": 296260.65,
"payment": 2145.79,
"interest": 1669.15,
"principal": 476.65
},
{
"month": 9,
"balance": 295781.32,
"payment": 2145.79,
"interest": 1666.47,
"principal": 479.33
},
{
"month": 10,
"balance": 295299.29,
"payment": 2145.79,
"interest": 1663.77,
"principal": 482.02
},
{
"month": 11,
"balance": 294814.56,
"payment": 2145.79,
"interest": 1661.06,
"principal": 484.74
},
{
"month": 12,
"balance": 294327.1,
"payment": 2145.79,
"interest": 1658.33,
"principal": 487.46
}
],
"annual_rate_percent": 6.75,
"interest_saved_by_extra": 109927.52
}
}
},
"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": "Loan term in years"
},
"principal": {
"type": "string",
"description": "Loan amount"
},
"extra_payment": {
"type": "string",
"description": "optional extra monthly payment"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"required": [
"monthly_payment",
"total_interest",
"payoff_months"
],
"properties": {
"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_paid": {
"type": "number",
"description": "Interest paid"
},
"principal_paid": {
"type": "number",
"description": "Principal paid"
}
}
},
"description": "Yearly values"
},
"principal": {
"type": [
"number",
"null"
],
"description": "Starting principal amount"
},
"checked_at": {
"type": [
"string",
"null"
],
"description": "Time the check was run (UTC)"
},
"total_paid": {
"type": "number",
"description": "Total paid"
},
"term_months": {
"type": [
"number",
"null"
],
"description": "Term months"
},
"extra_payment": {
"type": [
"number",
"null"
],
"description": "Extra payment"
},
"payoff_months": {
"type": "number",
"description": "Payoff months"
},
"total_interest": {
"type": "number",
"description": "Total interest"
},
"monthly_payment": {
"type": "number",
"description": "Monthly payment amount"
},
"first_12_payments": {
"type": "array",
"items": {
"type": "object",
"properties": {
"month": {
"type": "number",
"description": "Month"
},
"balance": {
"type": "number",
"description": "Balance in whole units"
},
"payment": {
"type": "number"
},
"interest": {
"type": "number"
},
"principal": {
"type": "number",
"description": "Starting principal amount"
}
}
},
"description": "First 12 payments"
},
"annual_rate_percent": {
"type": [
"number",
"null"
],
"description": "Annual rate as a percentage"
},
"interest_saved_by_extra": {
"type": "number",
"description": "Interest saved by extra"
}
}
}
}
}
}
}
},
"method": "GET",
"example": {
"method": "fixed-rate level payment; monthly rate = annual rate / 12; excludes taxes, insurance and fees",
"yearly": [
{
"year": 1,
"balance": 294327.1,
"interest_paid": 20076.63,
"principal_paid": 5672.9
},
{
"year": 2,
"balance": 288259.2,
"interest_paid": 19681.63,
"principal_paid": 6067.9
},
{
"year": 3,
"balance": 281768.81,
"interest_paid": 19259.14,
"principal_paid": 6490.39
},
{
"year": 4,
"balance": 274826.5,
"interest_paid": 18807.23,
"principal_paid": 6942.3
},
{
"year": 5,
"balance": 267400.82,
"interest_paid": 18323.85,
"principal_paid": 7425.68
},
{
"year": 6,
"balance": 259458.1,
"interest_paid": 17806.81,
"principal_paid": 7942.72
},
{
"year": 7,
"balance": 250962.35,
"interest_paid": 17253.78,
"principal_paid": 8495.75
},
{
"year": 8,
"balance": 241875.05,
"interest_paid": 16662.24,
"principal_paid": 9087.29
},
{
"year": 9,
"balance": 232155.03,
"interest_paid": 16029.51,
"principal_paid": 9720.02
},
{
"year": 10,
"balance": 221758.22,
"interest_paid": 15352.72,
"principal_paid": 10396.81
},
{
"year": 11,
"balance": 210637.5,
"interest_paid": 14628.81,
"principal_paid": 11120.72
},
{
"year": 12,
"balance": 198742.47,
"interest_paid": 13854.5,
"principal_paid": 11895.03
},
{
"year": 13,
"balance": 186019.22,
"interest_paid": 13026.27,
"principal_paid": 12723.26
},
{
"year": 14,
"balance": 172410.07,
"interest_paid": 12140.38,
"principal_paid": 13609.15
},
{
"year": 15,
"balance": 157853.34,
"interest_paid": 11192.8,
"principal_paid": 14556.73
},
{
"year": 16,
"balance": 142283.05,
"interest_paid": 10179.25,
"principal_paid": 15570.28
},
{
"year": 17,
"balance": 125628.65,
"interest_paid": 9095.12,
"principal_paid": 16654.41
},
{
"year": 18,
"balance": 107814.62,
"interest_paid": 7935.51,
"principal_paid": 17814.02
},
{
"year": 19,
"balance": 88760.25,
"interest_paid": 6695.16,
"principal_paid": 19054.38
},
{
"year": 20,
"balance": 68379.16,
"interest_paid": 5368.44,
"principal_paid": 20381.09
},
{
"year": 21,
"balance": 46578.97,
"interest_paid": 3949.35,
"principal_paid": 21800.19
},
{
"year": 22,
"balance": 23260.88,
"interest_paid": 2431.44,
"principal_paid": 23318.09
},
{
"year": 23,
"balance": 0,
"interest_paid": 807.85,
"principal_paid": 23260.88
}
],
"principal": 300000,
"total_paid": 590558.43,
"term_months": 360,
"extra_payment": 200,
"payoff_months": 276,
"total_interest": 290558.43,
"monthly_payment": 1945.79,
"first_12_payments": [
{
"month": 1,
"balance": 299541.71,
"payment": 2145.79,
"interest": 1687.5,
"principal": 458.29
},
{
"month": 2,
"balance": 299080.83,
"payment": 2145.79,
"interest": 1684.92,
"principal": 460.87
},
{
"month": 3,
"balance": 298617.37,
"payment": 2145.79,
"interest": 1682.33,
"principal": 463.46
},
{
"month": 4,
"balance": 298151.3,
"payment": 2145.79,
"interest": 1679.72,
"principal": 466.07
},
{
"month": 5,
"balance": 297682.6,
"payment": 2145.79,
"interest": 1677.1,
"principal": 468.69
},
{
"month": 6,
"balance": 297211.27,
"payment": 2145.79,
"interest": 1674.46,
"principal": 471.33
},
{
"month": 7,
"balance": 296737.29,
"payment": 2145.79,
"interest": 1671.81,
"principal": 473.98
},
{
"month": 8,
"balance": 296260.65,
"payment": 2145.79,
"interest": 1669.15,
"principal": 476.65
},
{
"month": 9,
"balance": 295781.32,
"payment": 2145.79,
"interest": 1666.47,
"principal": 479.33
},
{
"month": 10,
"balance": 295299.29,
"payment": 2145.79,
"interest": 1663.77,
"principal": 482.02
},
{
"month": 11,
"balance": 294814.56,
"payment": 2145.79,
"interest": 1661.06,
"principal": 484.74
},
{
"month": 12,
"balance": 294327.1,
"payment": 2145.79,
"interest": 1658.33,
"principal": 487.46
}
],
"annual_rate_percent": 6.75,
"interest_saved_by_extra": 109927.52
},
"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/amortization/free",
"tokenCount": null,
"inputSchema": {
"rate": "Annual interest rate in percent",
"years": "Loan term in years",
"principal": "Loan amount",
"extra_payment": "optional extra monthly payment"
},
"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": [
"monthly_payment",
"total_interest",
"payoff_months"
],
"properties": {
"yearly": {
"type": "array",
"items": {
"type": "object",
"properties": {
"year": {
"type": "number"
},
"balance": {
"type": "number"
},
"interest_paid": {
"type": "number"
},
"principal_paid": {
"type": "number"
}
}
}
},
"total_paid": {
"type": "number"
},
"payoff_months": {
"type": "number"
},
"total_interest": {
"type": "number"
},
"monthly_payment": {
"type": "number"
},
"first_12_payments": {
"type": "array",
"items": {
"type": "object",
"properties": {
"month": {
"type": "number"
},
"balance": {
"type": "number"
},
"payment": {
"type": "number"
},
"interest": {
"type": "number"
},
"principal": {
"type": "number"
}
}
}
},
"interest_saved_by_extra": {
"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/amortization",
"description": "",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "https://saylorinnovations.com/api/calc/amortization",
"description": "",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 120
}
]Provenance
- Seen in the source catalog
- 2026-10-12 15:11Z
- Last indexed by Roundhouse
- 2026-10-25 20:46Z
- 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. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
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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/amortization, 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.