Synthex Forge — x402 Paid Agent Services

Policy Check

policy_check

Read-onlyIdempotent

Deterministic policy evaluation: is this action allowed under this policy given this caller state? Returns a signed allow/deny verdict with the specific rule that fired. Safe-deny on malformed input.

VALUE: Whether one action is permitted for one caller under one policy, as of one instant — enforcement you can ask a question of.

PRICE: $0.10 USDC per call.

HOW TO PAY: USDC on eip155:8453, exact scheme, to 0xc8fF67FAE72596478599EAAcfad8656fAe1113c8. Sign an EIP-3009 transferWithAuthorization for the exact amount and put it in the X-PAYMENT header, then retry the same call. An unpaid call returns a payment_required payload with the amount, asset, network and payTo already filled in. The synthex-x402 SDK (PyPI and npm) does the 402 -> sign -> retry loop in one call.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`as_of`	No
`action`	No
`policy`	No
`caller_state`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed11 schema fields changedOct 22, 2026
- addedInput schema / properties / action / default
```
Added value: +null
```
- removedInput schema / properties / action / description
```
Removed value: -"The action being evaluated."
```
- addedInput schema / properties / action / title
```
Added value: +"Action"
```
- addedInput schema / properties / as_of
```
Added value: +{
+  "default": "",
+  "title": "As Of",
+  "type": "string"
+}
```
- addedInput schema / properties / caller_state / default
```
Added value: +null
```
- removedInput schema / properties / caller_state / description
```
Removed value: -"The caller's state (e.g. spend so far, role, tier)."
```
- addedInput schema / properties / caller_state / title
```
Added value: +"Caller State"
```
- addedInput schema / properties / policy / default
```
Added value: +null
```
- removedInput schema / properties / policy / description
```
Removed value: -"The policy to evaluate against."
```
- addedInput schema / properties / policy / title
```
Added value: +"Policy"
```
- removedInput schema / required
```
Removed value: -[]
```
First observedOct 22, 2026

TDQS

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Policy Check

Input Schema

Schema Changelog

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