$0.002
per call · USD Coin on Base
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.
Endpoint
POST https://agent.halowerk.com/v1/state-machine-step1
Calls / 30d
1
Unique payers / 30d
Aug 19
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://agent.halowerk.com/v1/state-machine-step", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
"context": {
"attempts": 1
},
"current_state": "awaiting_quote",
"elapsed_in_state_s": 120,
"event": {
"name": "quote_received",
"payload": {
"amount_eur": 420
}
},
"machine": {
"initial": "awaiting_quote",
"states": [
{
"name": "awaiting_quote",
"on": [
{
"actions": [
"book_slot"
],
"event": "quote_received",
"guard": {
"field": "payload.amount_eur",
"op": "lte",
"value": 500
},
"target": "quote_accepted"
},
{
"actions": [
"request_approval"
],
"event": "quote_received",
"target": "needs_approval"
},
{
"event": "cancel",
"target": "cancelled"
}
],
"timeout_actions": [
"notify_requester"
],
"timeout_s": 3600,
"timeout_target": "expired"
},
{
"name": "quote_accepted",
"on": [
{
"event": "cancel",
"target": "cancelled"
}
]
},
{
"name": "needs_approval",
"on": [
{
"event": "approved",
"target": "quote_accepted"
}
]
},
{
"final": true,
"name": "cancelled"
},
{
"final": true,
"name": "expired"
}
]
},
"timeout_precedence": "timeout"
}),
});
const data = await res.json();curl -X POST \
"https://agent.halowerk.com/v1/state-machine-step" \
-H "Content-Type: application/json" \
-d '{"context":{"attempts":1},"current_state":"awaiting_quote","elapsed_in_state_s":120,"event":{"name":"quote_received","payload":{"amount_eur":420}},"machine":{"initial":"awaiting_quote","states":[{"name":"awaiting_quote","on":[{"actions":["book_slot"],"event":"quote_received","guard":{"field":"payload.amount_eur","op":"lte","value":500},"target":"quote_accepted"},{"actions":["request_approval"],"event":"quote_received","target":"needs_approval"},{"event":"cancel","target":"cancelled"}],"timeout_actions":["notify_requester"],"timeout_s":3600,"timeout_target":"expired"},{"name":"quote_accepted","on":[{"event":"cancel","target":"cancelled"}]},{"name":"needs_approval","on":[{"event":"approved","target":"quote_accepted"}]},{"final":true,"name":"cancelled"},{"final":true,"name":"expired"}]},"timeout_precedence":"timeout"}' \
-H "X-PAYMENT: <signed x402 payment>"Payment details
0x2880edfff13100677bf97a3cbdf3bc34771c4e5eUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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