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Agent Result Budget Check
x402
Agent Result Budget Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates cumulative and per-call USDC spend against configured daily and per-call budget limits before accepting an x402 agent payment or delivery
Price / call$0.001
Success—
StatusUnknown
How this service works
Agent Result Budget Check: Agent Result Budget Check checks cumulative caller-supplied spend against daily and per-call budgets from bounded caller-supplied values without an external provider. Call Agent Result Budget Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for Agent Result Budget Check as ve…
Output
Returns an explicit acceptance or rejection status for the payment, along with contract-specific budget checks, normalized evidence of the submitted values, and a list of mismatch reasons explaining any budget violations — all computed in-memory from the caller-supplied USDC values without any external calls or data retention.
Example use cases
Autonomous agent pre-payment guard
“Before this x402 agent result gets paid out, run a budget check: the call is 0.03 USDC, I've spent 0.85 USDC today, my daily cap is 1.00 USDC, and my per-call limit is 0.05 USDC. Tell me if it should be accepted or rejected.”
Daily spend cap enforcement for fleet
“My agent fleet has a daily USDC budget of 5.00 and a per-call cap of 0.25. Before authorizing this 0.20 USDC call where we've already spent 4.90 USDC today, check if this payment should go through.”
Real-time overspend detection before x402 accept
“I need to verify a pending x402 payment: the call costs 0.15 USDC, my per-call max is 0.10 USDC, I've spent 0.50 USDC today, and my daily max is 2.00 USDC. Is this within budget or should I reject it?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/agent-result-budget-checkWhen to prefer
Use this endpoint when you need a lightweight, stateless, in-memory budget validation step before committing to an x402 payment or accepting an agent delivery. It is ideal for autonomous agent pipelines where you want to enforce per-call and daily USDC spend caps without maintaining server-side state. Prefer this over manual arithmetic checks when you need structured rejection reasons and normalized evidence for auditability.
Side effects
- Non-numeric or malformed USDC string values may cause parse errors or unexpected comparison behavior
- Missing required fields (call_usdc, maximum_call_usdc, etc.) may result in incomplete validation
- Caller-supplied values that are extremely large strings (up to 8192 chars) could cause precision edge cases
- No external oracle is used, so the check is only as valid as the caller-supplied inputs — garbage in, garbage out
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| call_usdc | string | Call USDC supplied to Agent Result Budget Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_day_usdc | string | Maximum Day USDC supplied to Agent Result Budget Check; used only for this bounded calculation and processed in memory without retention. |
| spent_today_usdc | string | Spent Today USDC supplied to Agent Result Budget Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_call_usdc | string | Maximum Call USDC supplied to Agent Result Budget Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"call_usdc": "0.001",
"within_day_budget": true,
"projected_day_usdc": "0.021",
"within_call_budget": true
},
"schema": "delx/util-agent-result-budget-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "8ad48af0de0158cceae3022914dbbf4f16ced4ca1f4253475e7371a33188c62b",
"external_calls": 0
},
"operation": "delivery_contract:agent_result_budget_check"
}
}Tags
x402
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