agent.halowerk.com
Takes a machine definition, the current state, one event and an optional context, and computes a single step. Transitions may carry a guard, which is a declared comparison — field, operator, value — and never an expression: the field is a dotted path into context or payload, so a machine handed in by a stranger cannot execute anything on this server.
TradingLiveeip155:8453Exactvia cdp
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far.
$11.47
Verified settled volume
2,655 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 2026-08-19 15:03Z
—
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://agent.halowerk.com/llms.txt",
"name": "state_machine_step",
"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://agent.halowerk.com/pricing",
"resource": {
"url": "https://agent.halowerk.com/v1/state-machine-step",
"mimeType": "application/json",
"description": "Takes a machine definition, the current state, one event and an optional context, and computes a single step. Transitions may carry a guard, which is a declared comparison — field, operator, value — and never an expression: the field is a dotted path into context or payload, so a machine handed in by a stranger cannot execute anything on this server."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"event": {
"name": "quote_received",
"payload": {
"amount_eur": 420
}
},
"context": {
"attempts": 1
},
"machine": {
"states": [
{
"on": [
{
"event": "quote_received",
"guard": {
"op": "lte",
"field": "payload.amount_eur",
"value": 500
},
"target": "quote_accepted",
"actions": [
"book_slot"
]
},
{
"event": "quote_received",
"target": "needs_approval",
"actions": [
"request_approval"
]
},
{
"event": "cancel",
"target": "cancelled"
}
],
"name": "awaiting_quote",
"timeout_s": 3600,
"timeout_target": "expired",
"timeout_actions": [
"notify_requester"
]
},
{
"on": [
{
"event": "cancel",
"target": "cancelled"
}
],
"name": "quote_accepted"
},
{
"on": [
{
"event": "approved",
"target": "quote_accepted"
}
],
"name": "needs_approval"
},
{
"name": "cancelled",
"final": true
},
{
"name": "expired",
"final": true
}
],
"initial": "awaiting_quote"
},
"current_state": "awaiting_quote",
"elapsed_in_state_s": 120,
"timeout_precedence": "timeout"
},
"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": [
"machine",
"current_state",
"event"
],
"properties": {
"event": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name."
},
"payload": {
"type": "object",
"description": "Event data, addressable in guards as payload.<field>."
}
},
"description": "The event to apply.",
"additionalProperties": false
},
"context": {
"type": "object",
"description": "Machine context, addressable in guards as context.<field>. Never modified."
},
"machine": {
"type": "object",
"required": [
"initial",
"states"
],
"properties": {
"states": {
"type": "array",
"items": {
"type": "object",
"required": [
"name"
],
"properties": {
"on": {
"type": "array",
"items": {
"type": "object",
"required": [
"event",
"target"
],
"properties": {
"event": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name this transition reacts to."
},
"guard": {
"type": "object",
"required": [
"field",
"op"
],
"properties": {
"op": {
"enum": [
"eq",
"ne",
"gt",
"gte",
"lt",
"lte",
"in",
"not_in",
"exists",
"not_exists"
],
"type": "string",
"description": "Comparison operator."
},
"field": {
"type": "string",
"maxLength": 200,
"minLength": 1,
"description": "Dotted path starting with context. or payload., e.g. context.attempts."
},
"value": {
"description": "Right-hand operand. Not used by exists and not_exists; an array for in and not_in."
}
},
"description": "Condition that must hold for this transition to be taken.",
"additionalProperties": false
},
"target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to."
},
"actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by this transition."
}
},
"additionalProperties": false
},
"maxItems": 50,
"description": "Event-driven transitions out of this state, evaluated in order."
},
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State name, unique within the machine."
},
"final": {
"type": "boolean",
"default": false,
"description": "If true no event is accepted in this state."
},
"timeout_s": {
"type": "number",
"maximum": 31536000,
"minimum": 0,
"description": "Deadline for this state in seconds."
},
"timeout_target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to when the deadline is exceeded. Without it a breach is only reported."
},
"timeout_actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by the deadline transition."
}
},
"additionalProperties": false
},
"maxItems": 200,
"minItems": 1,
"description": "The states of the machine."
},
"initial": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Name of the initial state. Must be one of the defined states."
}
},
"description": "The automaton definition.",
"additionalProperties": false
},
"current_state": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "The state the machine is in right now."
},
"elapsed_in_state_s": {
"type": "number",
"default": 0,
"maximum": 31536000,
"minimum": 0,
"description": "Seconds already spent in current_state. Supplied by you, so the result does not depend on this server clock."
},
"timeout_precedence": {
"enum": [
"timeout",
"event"
],
"type": "string",
"default": "timeout",
"description": "Which side wins when the deadline is breached and an event transition also matches."
}
},
"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": "Takes a machine definition, the current state, one event and an optional context, and computes a single step. Transitions may carry a guard, which is a declared comparison — field, operator, value — and never an expression: the field is a dotted path into context or payload, so a machine handed in by a stranger cannot execute anything on this server. Supported operators are eq, ne, gt, gte, lt, lte, in, not_in, exists and not_exists; a guard whose field does not resolve evaluates to false and says so rather than passing silently. Deadlines are computed from elapsed_in_state_s, which you supply, so the result does not depend on this server clock and the same request always yields the same answer. When a state carries timeout_s and the elapsed time exceeds it, timeout_precedence decides whether the timeout transition or a matching event transition wins; the default is timeout. A breached deadline is reported even when the state defines no timeout_target, in which case the machine does not move on account of it. The definition is checked for referential integrity before the step runs: transitions pointing at states that do not exist, and an initial state that does not exist, are rejected as a bad machine rather than silently followed. This endpoint is stateless: it stores no machine, no state and no history, and it applies exactly one step per call — use /v1/state-store to keep the state between calls.",
"inputSchema": {
"type": "object",
"required": [
"machine",
"current_state",
"event"
],
"properties": {
"event": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name."
},
"payload": {
"type": "object",
"description": "Event data, addressable in guards as payload.<field>."
}
},
"description": "The event to apply.",
"additionalProperties": false
},
"context": {
"type": "object",
"description": "Machine context, addressable in guards as context.<field>. Never modified."
},
"machine": {
"type": "object",
"required": [
"initial",
"states"
],
"properties": {
"states": {
"type": "array",
"items": {
"type": "object",
"required": [
"name"
],
"properties": {
"on": {
"type": "array",
"items": {
"type": "object",
"required": [
"event",
"target"
],
"properties": {
"event": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name this transition reacts to."
},
"guard": {
"type": "object",
"required": [
"field",
"op"
],
"properties": {
"op": {
"enum": [
"eq",
"ne",
"gt",
"gte",
"lt",
"lte",
"in",
"not_in",
"exists",
"not_exists"
],
"type": "string",
"description": "Comparison operator."
},
"field": {
"type": "string",
"maxLength": 200,
"minLength": 1,
"description": "Dotted path starting with context. or payload., e.g. context.attempts."
},
"value": {
"description": "Right-hand operand. Not used by exists and not_exists; an array for in and not_in."
}
},
"description": "Condition that must hold for this transition to be taken.",
"additionalProperties": false
},
"target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to."
},
"actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by this transition."
}
},
"additionalProperties": false
},
"maxItems": 50,
"description": "Event-driven transitions out of this state, evaluated in order."
},
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State name, unique within the machine."
},
"final": {
"type": "boolean",
"default": false,
"description": "If true no event is accepted in this state."
},
"timeout_s": {
"type": "number",
"maximum": 31536000,
"minimum": 0,
"description": "Deadline for this state in seconds."
},
"timeout_target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to when the deadline is exceeded. Without it a breach is only reported."
},
"timeout_actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by the deadline transition."
}
},
"additionalProperties": false
},
"maxItems": 200,
"minItems": 1,
"description": "The states of the machine."
},
"initial": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Name of the initial state. Must be one of the defined states."
}
},
"description": "The automaton definition.",
"additionalProperties": false
},
"current_state": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "The state the machine is in right now."
},
"elapsed_in_state_s": {
"type": "number",
"default": 0,
"maximum": 31536000,
"minimum": 0,
"description": "Seconds already spent in current_state. Supplied by you, so the result does not depend on this server clock."
},
"timeout_precedence": {
"enum": [
"timeout",
"event"
],
"type": "string",
"default": "timeout",
"description": "Which side wins when the deadline is breached and an event transition also matches."
}
},
"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.",
"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≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"event": {
"name": "quote_received",
"payload": {
"amount_eur": 420
}
},
"context": {
"attempts": 1
},
"machine": {
"states": [
{
"on": [
{
"event": "quote_received",
"guard": {
"op": "lte",
"field": "payload.amount_eur",
"value": 500
},
"target": "quote_accepted",
"actions": [
"book_slot"
]
},
{
"event": "quote_received",
"target": "needs_approval",
"actions": [
"request_approval"
]
},
{
"event": "cancel",
"target": "cancelled"
}
],
"name": "awaiting_quote",
"timeout_s": 3600,
"timeout_target": "expired",
"timeout_actions": [
"notify_requester"
]
},
{
"on": [
{
"event": "cancel",
"target": "cancelled"
}
],
"name": "quote_accepted"
},
{
"on": [
{
"event": "approved",
"target": "quote_accepted"
}
],
"name": "needs_approval"
},
{
"name": "cancelled",
"final": true
},
{
"name": "expired",
"final": true
}
],
"initial": "awaiting_quote"
},
"current_state": "awaiting_quote",
"elapsed_in_state_s": 120,
"timeout_precedence": "timeout"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"machine",
"current_state",
"event"
],
"properties": {
"event": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name."
},
"payload": {
"type": "object",
"description": "Event data, addressable in guards as payload.<field>."
}
},
"description": "The event to apply.",
"additionalProperties": false
},
"context": {
"type": "object",
"description": "Machine context, addressable in guards as context.<field>. Never modified."
},
"machine": {
"type": "object",
"required": [
"initial",
"states"
],
"properties": {
"states": {
"type": "array",
"items": {
"type": "object",
"required": [
"name"
],
"properties": {
"on": {
"type": "array",
"items": {
"type": "object",
"required": [
"event",
"target"
],
"properties": {
"event": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Event name this transition reacts to."
},
"guard": {
"type": "object",
"required": [
"field",
"op"
],
"properties": {
"op": {
"enum": [
"eq",
"ne",
"gt",
"gte",
"lt",
"lte",
"in",
"not_in",
"exists",
"not_exists"
],
"type": "string",
"description": "Comparison operator."
},
"field": {
"type": "string",
"maxLength": 200,
"minLength": 1,
"description": "Dotted path starting with context. or payload., e.g. context.attempts."
},
"value": {
"description": "Right-hand operand. Not used by exists and not_exists; an array for in and not_in."
}
},
"description": "Condition that must hold for this transition to be taken.",
"additionalProperties": false
},
"target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to."
},
"actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by this transition."
}
},
"additionalProperties": false
},
"maxItems": 50,
"description": "Event-driven transitions out of this state, evaluated in order."
},
"name": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State name, unique within the machine."
},
"final": {
"type": "boolean",
"default": false,
"description": "If true no event is accepted in this state."
},
"timeout_s": {
"type": "number",
"maximum": 31536000,
"minimum": 0,
"description": "Deadline for this state in seconds."
},
"timeout_target": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "State to move to when the deadline is exceeded. Without it a breach is only reported."
},
"timeout_actions": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"maxItems": 20,
"description": "Actions triggered by the deadline transition."
}
},
"additionalProperties": false
},
"maxItems": 200,
"minItems": 1,
"description": "The states of the machine."
},
"initial": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "Name of the initial state. Must be one of the defined states."
}
},
"description": "The automaton definition.",
"additionalProperties": false
},
"current_state": {
"type": "string",
"maxLength": 64,
"minLength": 1,
"description": "The state the machine is in right now."
},
"elapsed_in_state_s": {
"type": "number",
"default": 0,
"maximum": 31536000,
"minimum": 0,
"description": "Seconds already spent in current_state. Supplied by you, so the result does not depend on this server clock."
},
"timeout_precedence": {
"enum": [
"timeout",
"event"
],
"type": "string",
"default": "timeout",
"description": "Which side wins when the deadline is breached and an event transition also matches."
}
},
"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
- 2026-08-19 15:03Z
- Last indexed by Roundhouse
- 2026-09-18 14:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 09:45Z
- 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. 26 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 agent.halowerk.com 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=agent.halowerk.com' 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://agent.halowerk.com/v1/state-machine-step, 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.