HALOWERK x402werk
Reads the receipt of a transaction on Ethereum, Base, Base Sepolia, OP Mainnet, Arbitrum One, Polygon PoS or Avalanche C-Chain and compares it with what you expected to be paid. The comparison runs against the ERC-20 transfer events in the receipt, not against the transaction recipient, because in a token payment the transaction recipient is the token contract and never the seller. Returns every transfer event with sender, recipient, token, raw amount and human amount computed with that token de
InfraLiveeip155:8453Exactvia 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.
$11.48
Verified settled volume
2,658 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
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 2026-08-11 05:12Z
—
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://x402.halowerk.com/llms.txt",
"name": "verify_settlement",
"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": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://x402.halowerk.com/pricing",
"summary": "Checks on chain whether a settlement transaction really paid the expected recipient the expected amount of the expected token, reads it from the transfer events, and states separately whether the transaction is confirmed and whether it is final.",
"resource": {
"url": "https://x402.halowerk.com/settlement/verify",
"iconUrl": "https://x402.halowerk.com/favicon.svg",
"mimeType": "application/json",
"description": "Reads the receipt of a transaction on Ethereum, Base, Base Sepolia, OP Mainnet, Arbitrum One, Polygon PoS or Avalanche C-Chain and compares it with what you expected to be paid. The comparison runs against the ERC-20 transfer events in the receipt, not against the transaction recipient, because in a token payment the transaction recipient is the token contract and never the seller. Returns every transfer event with sender, recipient, token, raw amount and human amount computed with that token de",
"serviceName": "HALOWERK x402werk"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"chain": "arb",
"tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"expected": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"pay_to": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount_units": "1000000"
}
},
"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",
"tx_hash",
"expected"
],
"properties": {
"chain": {
"enum": [
"arb",
"arbitrum",
"arbitrum-one",
"avalanche",
"avax",
"base",
"base-mainnet",
"base-sepolia",
"basesepolia",
"eip155:1",
"eip155:10",
"eip155:137",
"eip155:42161",
"eip155:43114",
"eip155:8453",
"eip155:84532",
"eth",
"ethereum",
"ethereum-mainnet",
"mainnet",
"matic",
"op",
"op-mainnet",
"optimism",
"polygon"
],
"type": "string",
"description": "Chain of the transaction, as CAIP-2 (\"eip155:8453\"), as a short name (\"base\") or as the chain id (\"8453\")."
},
"tx_hash": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Hash of the settlement transaction."
},
"expected": {
"type": "object",
"required": [
"pay_to"
],
"properties": {
"asset": {
"type": "string",
"description": "Expected token contract address, or \"native\" for the chain coin. Omit to accept any token; asset_matches is then null."
},
"pay_to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address that was supposed to receive the payment — the seller, not the token contract."
},
"amount_units": {
"type": "string",
"pattern": "^[0-9]{1,78}$",
"description": "Expected amount as an integer in the smallest unit of the token. Omit to skip the amount comparison; amount_matches is then null."
}
},
"additionalProperties": false
}
},
"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": "0.002",
"description": "Reads the receipt of a transaction on Ethereum, Base, Base Sepolia, OP Mainnet, Arbitrum One, Polygon PoS or Avalanche C-Chain and compares it with what you expected to be paid. The comparison runs against the ERC-20 transfer events in the receipt, not against the transaction recipient, because in a token payment the transaction recipient is the token contract and never the seller. Returns every transfer event with sender, recipient, token, raw amount and human amount computed with that token decimals, the sum actually received by the expected recipient, underpaid_by and overpaid_by separately, the block number, the confirmation count, and a finality block read from the chain rather than estimated. Native coin payments are covered too when no token asset is expected. The verdict is bestaetigt, abweichung, nicht_gefunden or nicht_final; a correct but not yet finalized payment is reported as nicht_final rather than as confirmed. It does not pay, does not settle, does not sign and does not judge the counterparty.",
"inputSchema": {
"type": "object",
"required": [
"chain",
"tx_hash",
"expected"
],
"properties": {
"chain": {
"enum": [
"arb",
"arbitrum",
"arbitrum-one",
"avalanche",
"avax",
"base",
"base-mainnet",
"base-sepolia",
"basesepolia",
"eip155:1",
"eip155:10",
"eip155:137",
"eip155:42161",
"eip155:43114",
"eip155:8453",
"eip155:84532",
"eth",
"ethereum",
"ethereum-mainnet",
"mainnet",
"matic",
"op",
"op-mainnet",
"optimism",
"polygon"
],
"type": "string",
"description": "Chain of the transaction, as CAIP-2 (\"eip155:8453\"), as a short name (\"base\") or as the chain id (\"8453\")."
},
"tx_hash": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Hash of the settlement transaction."
},
"expected": {
"type": "object",
"required": [
"pay_to"
],
"properties": {
"asset": {
"type": "string",
"description": "Expected token contract address, or \"native\" for the chain coin. Omit to accept any token; asset_matches is then null."
},
"pay_to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address that was supposed to receive the payment — the seller, not the token contract."
},
"amount_units": {
"type": "string",
"pattern": "^[0-9]{1,78}$",
"description": "Expected amount as an integer in the smallest unit of the token. Omit to skip the amount comparison; amount_matches is then null."
}
},
"additionalProperties": false
}
},
"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",
"properties": {
"found": {
"type": "boolean"
},
"age_ms": {
"type": "integer"
},
"verdict": {
"enum": [
"bestaetigt",
"abweichung",
"nicht_gefunden",
"nicht_final"
],
"type": "string"
},
"finality": {
"type": "object"
},
"ts_fetched": {
"type": "integer"
},
"overpaid_by": {
"type": [
"string",
"null"
]
},
"block_number": {
"type": [
"integer",
"null"
]
},
"underpaid_by": {
"type": [
"string",
"null"
]
},
"amount_actual": {
"type": [
"string",
"null"
]
},
"asset_matches": {
"type": [
"boolean",
"null"
]
},
"confirmations": {
"type": [
"integer",
"null"
]
},
"amount_matches": {
"type": [
"boolean",
"null"
]
},
"transfer_events": {
"type": "array",
"items": {
"type": "object"
}
},
"verdict_reasons": {
"type": "array",
"items": {
"type": "string"
}
},
"recipient_matches": {
"type": [
"boolean",
"null"
]
},
"transaction_status": {
"enum": [
"success",
"reverted",
"pending",
null
],
"type": [
"string",
"null"
]
},
"unavailable_fields": {
"type": "array",
"items": {
"type": "string"
}
},
"amount_actual_human": {
"type": [
"string",
"null"
]
}
}
},
"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.
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"chain": "arb",
"tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"expected": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"pay_to": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount_units": "1000000"
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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",
"tx_hash",
"expected"
],
"properties": {
"chain": {
"enum": [
"arb",
"arbitrum",
"arbitrum-one",
"avalanche",
"avax",
"base",
"base-mainnet",
"base-sepolia",
"basesepolia",
"eip155:1",
"eip155:10",
"eip155:137",
"eip155:42161",
"eip155:43114",
"eip155:8453",
"eip155:84532",
"eth",
"ethereum",
"ethereum-mainnet",
"mainnet",
"matic",
"op",
"op-mainnet",
"optimism",
"polygon"
],
"type": "string",
"description": "Chain of the transaction, as CAIP-2 (\"eip155:8453\"), as a short name (\"base\") or as the chain id (\"8453\")."
},
"tx_hash": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Hash of the settlement transaction."
},
"expected": {
"type": "object",
"required": [
"pay_to"
],
"properties": {
"asset": {
"type": "string",
"description": "Expected token contract address, or \"native\" for the chain coin. Omit to accept any token; asset_matches is then null."
},
"pay_to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address that was supposed to receive the payment — the seller, not the token contract."
},
"amount_units": {
"type": "string",
"pattern": "^[0-9]{1,78}$",
"description": "Expected amount as an integer in the smallest unit of the token. Omit to skip the amount comparison; amount_matches is then null."
}
},
"additionalProperties": false
}
},
"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
- 2026-08-11 05:12Z
- Last indexed by Roundhouse
- 2026-09-10 05:00Z
- 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 x402werk 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%20x402werk' 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://x402.halowerk.com/settlement/verify, 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.