Saylor Innovations Reference Ex
Daily reference exchange rates for a base currency, with observation date
DataLiveeip155:8453Exactvia cdp
CurrenciesExchange ratesReference data
Calls · 30d
7→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 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.
4
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-10-18 12:24Z
—
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": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"memo": "saylor:utility:fx:USD",
"session": "eyJhcnRpY2xlSWQiOiJ1dGlsaXR5OmZ4OlVTRCIsInJlZmVyZW5jZSI6IkRrbW14TE5Tb3BZa2ZYcWR6QWM5TTdENkRKUkRlcURDZG9mOGVoS3g1N203IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjMwMDAsImV4cCI6MTc5MDI4ODIzMzc0NX0.8WwQPXxJrBOjv1uwsgdSsg8zMu7tLNSj3sywUGrQUlA",
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"reference": "DkmmxLNSopYkfXqdzAc9M7D6DJRDeqDCdof8ehKx57m7"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "3000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
},
{
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"memo": "saylor:utility:fx:USD",
"session": "eyJhcnRpY2xlSWQiOiJ1dGlsaXR5OmZ4OlVTRCIsInJlZmVyZW5jZSI6IjZRZVE1S3pkMkhFZWNvY3A0QnB1cUFwVEI0ZVZHZ3lwMkdlMk5Qc000R1ZiIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjMwMDAsImV4cCI6MTc5MDI4ODIzMzc0NX0.SQw6LdgRcLnbK6IHVoKqEpp_ozUzf2MIMTDW9bJg0jU",
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"reference": "6QeQ5Kzd2HEecocp4BpuqApTB4eVGgyp2Ge2NPsM4GVb"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "3000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"memo": "saylor:utility:fx:USD",
"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": "0xf8A376eBF123D7252cd7b66bcD77A727a4def22f",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"memo": "saylor:utility:fx:USD",
"name": "USD Coin",
"note": "Polygon 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": "0xf8A376eBF123D7252cd7b66bcD77A727a4def22f",
"amount": "3000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 120
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"memo": "saylor:utility:fx:USD",
"name": "USD Coin",
"note": "Arbitrum 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": "0xf8A376eBF123D7252cd7b66bcD77A727a4def22f",
"amount": "3000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 120
},
{
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:utility:fx:USD",
"note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
"native": true,
"session": "eyJhcnRpY2xlSWQiOiJ1dGlsaXR5OmZ4OlVTRCIsInJlZmVyZW5jZSI6Im5nVTJ6Z0RVUjdUTnp5ZVpwZHdydjNwUHMxS21pRVB2a3dmcVdWOExjSm4iLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6MjQ5NjEsImV4cCI6MTc5MDI4ODIzMzc0Nn0.-8Bq4Ph39XBbworqtpvSiGzGAW-pEap2jL3m9E6UExU",
"reference": "ngU2zgDUR7TNzyeZpdwrv3pPs1KmiEPvkwfqWV8LcJn",
"solUsdPrice": 116.58,
"quotedLamports": "25733"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "24961",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://saylorinnovations.com/api/data/exchange-rates?base=USD",
"tags": [
"currencies",
"exchange rates",
"reference data"
],
"iconUrl": "https://saylorinnovations.com/og-image.jpg",
"mimeType": "application/json",
"description": "Get daily reference exchange rates per one unit of a base currency, with observation date and currency codes. Not executable trading quotes. ECB source data is also available free from ecb.europa.eu.",
"serviceName": "Saylor Innovations — Reference Exchange Rates"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"base": "USD"
}
},
"output": {
"type": "json",
"example": {
"report": {
"base": "USD",
"date": "2026-09-18",
"rates": {
"EUR": 0.8726
},
"amount": 1,
"notice": "Source: European Central Bank via Frankfurter. The underlying ECB data is available free at ecb.europa.eu. Frankfurter rebases ECB reference rates into the requested currency. Rates are daily reference observations, not live or executable trading quotes; weekends and holidays may use an earlier observation.",
"sourceDataUrl": "https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html"
},
"sample": true,
"source": {
"url": "https://api.frankfurter.dev/v1/latest?base=USD",
"name": "European Central Bank via Frankfurter"
},
"service": "fx",
"subject": "USD",
"retrievedAt": "2026-09-18T14:43:08.006Z",
"fixedSubject": "USD",
"exampleTruncated": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"queryParams"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"base"
],
"properties": {
"base": {
"type": "string",
"description": "Three-letter currency code supported by the ECB reference-rate feed, for example USD or EUR."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"required": [
"service",
"subject",
"retrievedAt",
"source",
"report"
],
"properties": {
"report": {
"type": "object",
"required": [
"base",
"date",
"amount",
"rates",
"notice"
],
"properties": {
"base": {
"type": "string"
},
"date": {
"type": "string"
},
"rates": {
"type": "object",
"additionalProperties": {
"type": "number"
}
},
"amount": {
"type": "number"
},
"notice": {
"type": "string"
}
}
},
"source": {
"type": "object",
"required": [
"name",
"url"
],
"properties": {
"url": {
"type": "string",
"format": "uri"
},
"name": {
"type": "string"
}
}
},
"service": {
"type": "string"
},
"subject": {
"type": "string"
},
"retrievedAt": {
"type": "string",
"format": "date-time"
}
}
}
}
}
}
}
},
"method": "GET",
"example": {
"report": {
"base": "USD",
"date": "2026-09-18",
"rates": {
"EUR": 0.8726
},
"amount": 1,
"notice": "Source: European Central Bank via Frankfurter. The underlying ECB data is available free at ecb.europa.eu. Frankfurter rebases ECB reference rates into the requested currency. Rates are daily reference observations, not live or executable trading quotes; weekends and holidays may use an earlier observation.",
"sourceDataUrl": "https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html"
},
"sample": true,
"source": {
"url": "https://api.frankfurter.dev/v1/latest?base=USD",
"name": "European Central Bank via Frankfurter"
},
"service": "fx",
"subject": "USD",
"retrievedAt": "2026-09-18T14:43:08.006Z",
"fixedSubject": "USD",
"exampleTruncated": true
},
"license": "Source metadata retains its original terms; Saylor supplies the normalized report.",
"mimeType": "application/json",
"freeSample": "https://saylorinnovations.com/api/services/sample/fx",
"description": "Get daily reference exchange rates per one unit of a base currency, with observation date and currency codes. Not executable trading quotes. ECB source data is also available free from ecb.europa.eu.",
"inputSchema": {
"base": "Three-letter currency code supported by the ECB reference-rate feed, for example USD or EUR."
},
"serviceName": "Saylor Innovations — Reference Exchange Rates",
"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": [
"service",
"subject",
"retrievedAt",
"source",
"report"
],
"properties": {
"report": {
"type": "object",
"required": [
"base",
"date",
"amount",
"rates",
"notice"
],
"properties": {
"base": {
"type": "string"
},
"date": {
"type": "string"
},
"rates": {
"type": "object",
"additionalProperties": {
"type": "number"
}
},
"amount": {
"type": "number"
},
"notice": {
"type": "string"
}
}
},
"source": {
"type": "object",
"required": [
"name",
"url"
],
"properties": {
"url": {
"type": "string",
"format": "uri"
},
"name": {
"type": "string"
}
}
},
"service": {
"type": "string"
},
"subject": {
"type": "string"
},
"retrievedAt": {
"type": "string",
"format": "date-time"
}
}
},
"settlementModes": [
"facilitator-transaction",
"self-submitted-reference"
],
"parameterLocation": "query"
},
"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
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
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"memo": "saylor:utility:fx:USD",
"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:utility:fx:USD",
"session": "eyJhcnRpY2xlSWQiOiJ1dGlsaXR5OmZ4OlVTRCIsInJlZmVyZW5jZSI6Ijg5aTNocDRDSm10SDZKbkFESEJlS3llQ2ZxdXJvS1dMOU12Yk53M1VSN0pkIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTIzMjYzODk0NjV9.qb2MELzHkBv6TicyHSBgw_C3T0vyLmL3ROuR6cc8jK0",
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
"reference": "89i3hp4CJmtH6JnADHBeKyeCfquroKWL9MvbNw3UR7Jd"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"base": "USD"
}
},
"output": {
"type": "json",
"example": {
"report": {
"base": "USD",
"date": "2026-09-18",
"rates": {
"EUR": 0.8726
},
"amount": 1,
"notice": "Source: European Central Bank via Frankfurter. The underlying ECB data is available free at ecb.europa.eu. Frankfurter rebases ECB reference rates into the requested currency. Rates are daily reference observations, not live or executable trading quotes; weekends and holidays may use an earlier observation.",
"sourceDataUrl": "https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html"
},
"sample": true,
"source": {
"url": "https://api.frankfurter.dev/v1/latest?base=USD",
"name": "European Central Bank via Frankfurter"
},
"service": "fx",
"subject": "USD",
"retrievedAt": "2026-09-18T14:43:08.006Z",
"fixedSubject": "USD",
"exampleTruncated": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"queryParams"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"base"
],
"properties": {
"base": {
"type": "string",
"description": "Three-letter currency code supported by the ECB reference-rate feed, for example USD or EUR."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"required": [
"service",
"subject",
"retrievedAt",
"source",
"report"
],
"properties": {
"report": {
"type": "object",
"required": [
"base",
"date",
"amount",
"rates",
"notice"
],
"properties": {
"base": {
"type": "string",
"description": "Base asset or base currency"
},
"date": {
"type": "string",
"description": "Date (YYYY-MM-DD)"
},
"rates": {
"type": "object",
"description": "Rates keyed by code",
"additionalProperties": {
"type": "number"
}
},
"amount": {
"type": "number",
"description": "Amount"
},
"notice": {
"type": "string"
},
"sourceDataUrl": {
"type": [
"string",
"null"
],
"description": "Source data URL"
}
},
"description": "Structured report for the subject, with the fields described in the example"
},
"sample": {
"type": [
"boolean",
"null"
],
"description": "True when this is a fixed sample response"
},
"source": {
"type": "object",
"required": [
"name",
"url"
],
"properties": {
"url": {
"type": "string",
"format": "uri",
"description": "Canonical URL"
},
"name": {
"type": "string",
"description": "Name"
}
},
"description": "Data source the values come from"
},
"service": {
"type": "string",
"description": "Service name"
},
"subject": {
"type": "string",
"description": "What this response is for"
},
"retrievedAt": {
"type": "string",
"format": "date-time",
"description": "Time the data was retrieved from the source (UTC)"
},
"fixedSubject": {
"type": [
"string",
"null"
],
"description": "True when the sample is for a fixed subject"
},
"exampleTruncated": {
"type": [
"boolean",
"null"
],
"description": "True when the example is shortened"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-18 12:24Z
- Last indexed by Roundhouse
- 2026-10-26 20:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 22:15Z
- x402 version
- 2
- 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. 32 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 Saylor Innovations Reference Ex 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=Saylor%20Innovations%20%20Reference%20Ex' 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/data/exchange-rates, 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.