Saylor Innovations Data Desk
Contract event logs on 16 EVM chains from recent blocks, newest first: Transfer, Approval and Swap events labelled and filterable by topic and block range.
TradingLiveeip155:8453Exactvia cdp
Contract event logsEth getlogsRecent transfer eventsFilter logs by topicSwap events for pool
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-22 23:31Z
—
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.
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 Polygon · 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
- 0xA2A8…fc8aa
- Token contract
- 0x3c49…c3359
- Payment window
- 2 minutes
10000units
on Arbitrum · 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
- 0xA2A8…fc8aa
- Token contract
- 0xaf88…e5831
- Payment window
- 2 minutes
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
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
- Es9vMF…nwNYB
- Payment window
- 2 minutes
93909units
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
- So1111…11112
- Payment window
- 2 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"memo": "saylor:datadesk:chain-events",
"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": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"memo": "saylor:datadesk:chain-events",
"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": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"amount": "10000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 120
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"memo": "saylor:datadesk:chain-events",
"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": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"amount": "10000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 120
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"memo": "saylor:datadesk:chain-events",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ldmVudHMiLCJyZWZlcmVuY2UiOiI2MmE2bjg2TTR3bkRWR1lod2Z2YWdhcEZLYkpxS2ZydXN2TDZuNnhyc2NOMSIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyNzExOTg1NTAzfQ.DL5-Qhqy81lJjM5E7Sc4niv5hcEmYfkV1QKop6nQcXU",
"feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
"reference": "62a6n86M4wnDVGYhwfvagapFKbJqKfrusvL6n6xrscN1"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
},
{
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"memo": "saylor:datadesk:chain-events",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ldmVudHMiLCJyZWZlcmVuY2UiOiI5emlVQzhlYUdQYmZSbnVpNHZiZzNNdWVxcUd1bXNVZmk1Qnk5WjFENG45QSIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVzOXZNRnJ6YUNFUm1KZnJGNEgyRllENEtDb05rWTExTWNDZThCZW53TllCIiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyNzExOTg1NTAzfQ.m8c2FsmvZHXkrBlQr8t4IS_uYl4nUe5AF7M99jMJQCU",
"feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
"reference": "9ziUC8eaGPbfRnui4vbg3MueqqGumsUfi5By9Z1D4n9A"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "10000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
},
{
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:chain-events",
"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": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1ldmVudHMiLCJyZWZlcmVuY2UiOiIzck1ZYWdvdktjWHpCeUZFZ1h3TkN6NU1UWFNDTTNEUnR0SFZTYnFrcUY5eCIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6bnVsbCwibWluQW1vdW50Ijo5MzkwOSwiZXhwIjoxNzkyNzExOTg1NTAzfQ.-GxJzUfF-_43QvHxAjd2LMQy6CNtS8-EfdobA2CFG18",
"reference": "3rMYagovKcXzByFEgXwNCz5MTXSCM3DRttHVSbqkqF9x",
"solUsdPrice": 103.29,
"quotedLamports": "96814"
},
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"amount": "93909",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "base",
"event": "Transfer",
"limit": "5",
"blocks": "30",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}
},
"output": {
"type": "json",
"example": {
"note": "Raw logs from eth_getLogs over the most recent 30 blocks, newest first. Known event names (Transfer, Approval, Swap and…",
"chain": "base",
"events": [
{
"data": "0x000000000000000000000000000000000000000000000000000000c8bc39064e",
"event": "Transfer",
"topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"topics": 3,
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"tx_hash": "0xfb9de32814735541d4f04d644b64ec251206f23ea47bb6525c40143a9424cd55",
"log_index": 750,
"amount_raw": "862151312974",
"data_bytes": 32,
"topics_hex": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000001a91463eb4ce91d85c612b0c35fdab9460c5d2b7"
],
"block_number": 52880036,
"from_or_owner": "0x1a91463eb4ce91d85c612b0c35fdab9460c5d2b7",
"to_or_spender": "0x4e962bb3889bf030368f56810a9c96b83cb3e778"
},
{
"data": "0x0000000000000000000000000000000000000000000000000000004a0aa76394",
"event": "Transfer",
"topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"topics": 3,
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"tx_hash": "0xd79e24f253a16a358eadb114da5c58fbf17b27c5e5be13c56eec19fe5937ec5f",
"log_index": 739,
"amount_raw": "318006322068",
"data_bytes": 32,
"topics_hex": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x000000000000000000000000787fd1dc3b533171781e4ae1a563c1ac7b4435e4"
],
"block_number": 52880036,
"from_or_owner": "0x787fd1dc3b533171781e4ae1a563c1ac7b4435e4",
"to_or_spender": "0xb2cc224c1c9fee385f8ad6a55b4d94e92359dc59"
}
],
"source": "Chain JSON-RPC (base)",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"matched": 2730,
"chain_id": 8453,
"returned": 5,
"to_block": 52880036,
"from_block": 52880007,
"newest_first": true,
"blocks_scanned": 30
}
}
},
"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"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"chain",
"address"
],
"properties": {
"chain": {
"type": "string",
"description": "chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id"
},
"event": {
"type": "string",
"description": "optional event name (Transfer, Approval, ApprovalForAll, Deposit, Withdrawal, UniswapV2Swap, UniswapV3Swap, Sync, OwnershipTransferred, Upgraded) or a 0x topic0 hash"
},
"limit": {
"type": "string",
"description": "optional maximum events returned, 1 to 200 (default 50)"
},
"blocks": {
"type": "string",
"description": "optional number of recent blocks to scan, 1 to 2000 (default 500)"
},
"address": {
"type": "string",
"description": "the contract that emitted the events"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string",
"const": "json"
},
"example": {
"type": "object",
"required": [
"chain",
"chain_id",
"address",
"from_block",
"to_block",
"matched",
"returned",
"events",
"note",
"source"
],
"properties": {
"note": {
"type": "string",
"description": "plain-language reading of the result"
},
"chain": {
"type": "string",
"description": "the chain name that was queried"
},
"events": {
"type": [
"array",
"null"
],
"items": {
"type": "object",
"properties": {
"data": {
"type": [
"string",
"null"
],
"description": "raw log data, null when over 512 bytes"
},
"event": {
"type": [
"string",
"null"
],
"description": "event name when topic0 is a known one"
},
"topic0": {
"type": [
"string",
"null"
],
"description": "event signature hash"
},
"tx_hash": {
"type": [
"string",
"null"
],
"description": "transaction that emitted it"
},
"log_index": {
"type": [
"number",
"null"
],
"description": "position among the block's logs"
},
"amount_raw": {
"type": [
"string",
"null"
],
"description": "amount in base units for Transfer and Approval"
},
"topics_hex": {
"type": [
"array",
"null"
],
"description": "up to four raw topics"
},
"block_number": {
"type": [
"number",
"null"
],
"description": "block of the log"
},
"from_or_owner": {
"type": [
"string",
"null"
],
"description": "first indexed address for Transfer and Approval"
},
"to_or_spender": {
"type": [
"string",
"null"
],
"description": "second indexed address for Transfer and Approval"
}
}
},
"description": "matching logs"
},
"source": {
"type": "string",
"description": "where the data was read from"
},
"address": {
"type": "string",
"description": "contract whose logs were read"
},
"matched": {
"type": "number",
"description": "logs matching the filter in that range"
},
"chain_id": {
"type": "number",
"description": "EIP-155 chain id of that network"
},
"returned": {
"type": "number",
"description": "logs returned in this response"
},
"to_block": {
"type": "number",
"description": "last block scanned"
},
"from_block": {
"type": "number",
"description": "first block scanned"
},
"newest_first": {
"type": "boolean",
"description": "true: events are ordered newest first"
},
"blocks_scanned": {
"type": "number",
"description": "number of blocks scanned"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-22 23:31Z
- Last indexed by Roundhouse
- 2026-10-26 17:40Z
- Last enriched (probe, favicon, geo)
- 2026-10-21 04:45Z
- 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. 6 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 Data Desk 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%20Data%20Desk' 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/chain/events, 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.