agentshelf.syntexa.ch
Call when an agent needs Ethereum mainnet ETH and USDC balances plus tx_count for one address. Send address as EIP-55 or all-lowercase 0x. Read-only eth_getBalance and USDC balanceOf on eip155:1. No private key and no spend. Send JSON {"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-balance first.
SearchLiveeip155:8453Exactvia cdp
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 snapshots so far.
$6.82
Verified settled volume
1,320 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-17 09:30Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x1D61FAA032d3f40D9C470D2bf3A3f53De0E55a38The 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": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1D61FAA032d3f40D9C470D2bf3A3f53De0E55a38",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://agentshelf.syntexa.ch/v1/eth-balance",
"description": "Call when an agent needs Ethereum mainnet ETH and USDC balances plus tx_count for one address. Send address as EIP-55 or all-lowercase 0x. Read-only eth_getBalance and USDC balanceOf on eip155:1. No private key and no spend. Send JSON {\"address\":\"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-balance first.",
"outputSchema": {
"info": {
"input": {
"body": {
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"eth": "1",
"usdc": "1",
"billed": true,
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"eth_wei": "1000000000000000000",
"network": "eip155:1",
"tx_count": 1,
"warnings": [],
"x402_hint": "USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend.",
"receipt_id": "rcpt_01EXAMPLE000000000000000",
"usdc_atomic": "1000000",
"usdc_contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"examples": [
{
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
],
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"examples": [
"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
],
"description": "Address on Ethereum mainnet (eip155:1). Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. Returns eth_wei, eth, Circle USDC, and tx_count. EIP-55 or all one case. Read-only. No private key."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"examples": [
{
"ok": true,
"eth": "1",
"usdc": "1",
"billed": true,
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"eth_wei": "1000000000000000000",
"network": "eip155:1",
"tx_count": 1,
"warnings": [],
"x402_hint": "USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend.",
"receipt_id": "rcpt_01EXAMPLE000000000000000",
"usdc_atomic": "1000000",
"usdc_contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
}
],
"required": [
"ok",
"receipt_id",
"billed",
"address",
"network",
"eth_wei",
"eth",
"usdc_contract",
"usdc_atomic",
"usdc",
"tx_count",
"x402_hint"
],
"properties": {
"ok": {
"type": "boolean",
"const": true,
"examples": [
true
]
},
"eth": {
"type": "string",
"examples": [
"1"
]
},
"usdc": {
"type": "string",
"examples": [
"1"
]
},
"billed": {
"type": "boolean",
"examples": [
true
]
},
"address": {
"type": "string",
"examples": [
"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
]
},
"eth_wei": {
"type": "string",
"examples": [
"1000000000000000000"
]
},
"network": {
"type": "string",
"const": "eip155:1",
"examples": [
"eip155:1"
]
},
"tx_count": {
"type": "integer",
"minimum": 0,
"examples": [
1
]
},
"warnings": {
"type": "array",
"items": {
"type": "string"
},
"default": [],
"examples": [
[]
]
},
"x402_hint": {
"type": "string",
"examples": [
"USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend."
]
},
"receipt_id": {
"type": "string",
"examples": [
"rcpt_01EXAMPLE000000000000000"
]
},
"usdc_atomic": {
"type": "string",
"examples": [
"1000000"
]
},
"usdc_contract": {
"type": "string",
"const": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"examples": [
"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
]
}
},
"additionalProperties": false
}
}
}
}
}
},
"maxAmountRequired": "1000",
"maxTimeoutSeconds": 60
}
],
"x402Version": 1
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.001USDC≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0x1D61…55a38. The signed payment is good for 1 minute.
- Paid to
- 0x1D61…55a38
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1D61FAA032d3f40D9C470D2bf3A3f53De0E55a38",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"eth": "1",
"usdc": "1",
"billed": true,
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"eth_wei": "1000000000000000000",
"network": "eip155:1",
"tx_count": 1,
"warnings": [],
"x402_hint": "USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend.",
"receipt_id": "rcpt_01EXAMPLE000000000000000",
"usdc_atomic": "1000000",
"usdc_contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"examples": [
{
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
],
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"examples": [
"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
],
"description": "Address on Ethereum mainnet (eip155:1). Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. Returns eth_wei, eth, Circle USDC, and tx_count. EIP-55 or all one case. Read-only. No private key."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"examples": [
{
"ok": true,
"eth": "1",
"usdc": "1",
"billed": true,
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"eth_wei": "1000000000000000000",
"network": "eip155:1",
"tx_count": 1,
"warnings": [],
"x402_hint": "USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend.",
"receipt_id": "rcpt_01EXAMPLE000000000000000",
"usdc_atomic": "1000000",
"usdc_contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
}
],
"required": [
"ok",
"receipt_id",
"billed",
"address",
"network",
"eth_wei",
"eth",
"usdc_contract",
"usdc_atomic",
"usdc",
"tx_count",
"x402_hint"
],
"properties": {
"ok": {
"type": "boolean",
"const": true,
"examples": [
true
]
},
"eth": {
"type": "string",
"examples": [
"1"
]
},
"usdc": {
"type": "string",
"examples": [
"1"
]
},
"billed": {
"type": "boolean",
"examples": [
true
]
},
"address": {
"type": "string",
"examples": [
"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
]
},
"eth_wei": {
"type": "string",
"examples": [
"1000000000000000000"
]
},
"network": {
"type": "string",
"const": "eip155:1",
"examples": [
"eip155:1"
]
},
"tx_count": {
"type": "integer",
"minimum": 0,
"examples": [
1
]
},
"warnings": {
"type": "array",
"items": {
"type": "string"
},
"default": [],
"examples": [
[]
]
},
"x402_hint": {
"type": "string",
"examples": [
"USDC balance covers about 1000 units of $0.001 on Ethereum mainnet. Read-only on eip155:1. No spend."
]
},
"receipt_id": {
"type": "string",
"examples": [
"rcpt_01EXAMPLE000000000000000"
]
},
"usdc_atomic": {
"type": "string",
"examples": [
"1000000"
]
},
"usdc_contract": {
"type": "string",
"const": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"examples": [
"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
]
}
},
"additionalProperties": false
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-17 09:30Z
- Last indexed by Roundhouse
- 2026-10-26 22:10Z
- Last enriched (probe, favicon, geo)
- 2026-10-17 11:45Z
- x402 version
- 2
- Max timeout
- 60s
- 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. 13 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 agentshelf.syntexa.ch 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=agentshelf.syntexa.ch' 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://agentshelf.syntexa.ch/v1/eth-balance, 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.