HALOWERK defiwerk
Takes chain, token pair, input amount and slippage tolerance, finds the pool the trade would most likely use and reads its live state. The maximum the caller can lose is arithmetic and exact: the gap between the quoted output and the minimum output their own tolerance permits. The attacker profit is an estimate and labelled as one — the profit-maximising front-run size is searched for inside a constant-liquidity pool model, bounded by the largest front-run the caller own tolerance still permits,
SearchLiveeip155:8453Exactvia cdp
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.
$11.47
Verified settled volume
2,654 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0060
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 2026-08-09 18:25Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5EThe 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.
{
"docs": "https://defi.halowerk.com/llms.txt",
"name": "mev_risk",
"error": "payment_required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "6000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://defi.halowerk.com/pricing",
"summary": "Estimates what a sandwich attack on one specific swap would earn an attacker, compares it against the gas that attack costs, counts sandwiches that actually happened on that pool from on-chain events, and lists concrete mitigations with their effect and their price.",
"resource": {
"url": "https://defi.halowerk.com/mev/risk",
"iconUrl": "https://defi.halowerk.com/favicon.svg",
"mimeType": "application/json",
"description": "Takes chain, token pair, input amount and slippage tolerance, finds the pool the trade would most likely use and reads its live state. The maximum the caller can lose is arithmetic and exact: the gap between the quoted output and the minimum output their own tolerance permits. The attacker profit is an estimate and labelled as one — the profit-maximising front-run size is searched for inside a constant-liquidity pool model, bounded by the largest front-run the caller own tolerance still permits,",
"serviceName": "HALOWERK defiwerk"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"chain": "base",
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount_in": "1",
"token_out": "0x4200000000000000000000000000000000000006",
"scan_history": false
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"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",
"required": [
"chain",
"token_in",
"token_out",
"amount_in"
],
"properties": {
"chain": {
"enum": [
"base",
"ethereum",
"arbitrum",
"optimism",
"polygon"
],
"type": "string"
},
"route": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$",
"description": "Optional pool address to assess instead of the automatically chosen one."
},
"token_in": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"amount_in": {
"type": "string",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"description": "Input amount in whole token units as a decimal string."
},
"token_out": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"scan_history": {
"type": "boolean",
"default": true,
"description": "Scan past Swap events for actual sandwiches. Costs time; switch off for a faster answer."
},
"slippage_bps": {
"type": "integer",
"default": 50,
"maximum": 5000,
"minimum": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
},
"price_usdc": "0.006",
"description": "Takes chain, token pair, input amount and slippage tolerance, finds the pool the trade would most likely use and reads its live state. The maximum the caller can lose is arithmetic and exact: the gap between the quoted output and the minimum output their own tolerance permits. The attacker profit is an estimate and labelled as one — the profit-maximising front-run size is searched for inside a constant-liquidity pool model, bounded by the largest front-run the caller own tolerance still permits, and the same model is checked against the official Quoter for the unattacked swap so that model_error_bps is visible rather than hidden. That profit is then set against the gas two attacker transactions cost: below it, the attack does not pay for itself, and the answer says so instead of warning about a danger that does not add up. Whether the chain even has a public pending pool is stated with its reason, because on a single-sequencer chain a third party cannot see the trade before the block. recent_sandwiches_on_pool is not estimated but counted from Swap events in the scanned block window, with the window length and the detection pattern disclosed. Mitigations come with numbers: what a tighter tolerance caps the loss at, what splitting the order costs in extra gas and saves in impact. Nothing is executed, forwarded, signed or submitted, and no protection is promised.",
"inputSchema": {
"type": "object",
"required": [
"chain",
"token_in",
"token_out",
"amount_in"
],
"properties": {
"chain": {
"enum": [
"base",
"ethereum",
"arbitrum",
"optimism",
"polygon"
],
"type": "string"
},
"route": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$",
"description": "Optional pool address to assess instead of the automatically chosen one."
},
"token_in": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"amount_in": {
"type": "string",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"description": "Input amount in whole token units as a decimal string."
},
"token_out": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"scan_history": {
"type": "boolean",
"default": true,
"description": "Scan past Swap events for actual sandwiches. Costs time; switch off for a faster answer."
},
"slippage_bps": {
"type": "integer",
"default": 50,
"maximum": 5000,
"minimum": 1
}
},
"additionalProperties": false
},
"price_model": "per_call",
"x402Version": 2,
"instructions": "Sign the accepted terms with an x402 client and repeat the request with the payment header.",
"outputSchema": {
"type": "object"
},
"payment_header": "PAYMENT-SIGNATURE",
"capability_request": {
"url": "https://bedarf.halowerk.com/capabilities/request",
"cost": "free",
"method": "POST",
"description": "Missing a capability, or does the scope not fit? Report the need here - no payment required. Similar reports are bundled; the response returns an id you can check back on.",
"body_example": {
"max_price": 0.01,
"description": "what exactly is needed",
"requested_capability": "short label"
}
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.006USDC≈ $0.006 USD
on Base · exact scheme
Pay 0.006 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 6000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "6000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"chain": "base",
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount_in": "1000000",
"token_out": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"chain",
"token_in",
"token_out",
"amount_in"
],
"properties": {
"chain": {
"enum": [
"base",
"ethereum",
"arbitrum",
"optimism",
"polygon"
],
"type": "string"
},
"route": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$",
"description": "Optional pool address to assess instead of the automatically chosen one."
},
"token_in": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"amount_in": {
"type": "string",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"description": "Input amount in whole token units as a decimal string."
},
"token_out": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"scan_history": {
"type": "boolean",
"default": true,
"description": "Scan past Swap events for actual sandwiches. Costs time; switch off for a faster answer."
},
"slippage_bps": {
"type": "integer",
"default": 50,
"maximum": 5000,
"minimum": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-09 18:25Z
- Last indexed by Roundhouse
- 2026-09-08 18:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 18:45Z
- x402 version
- 2
- Max timeout
- 300s
- 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. 16 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 HALOWERK defiwerk 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=HALOWERK%20defiwerk' 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://defi.halowerk.com/mev/risk, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.