# Agent Result Envelope Check

> Agent Result Envelope Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).

Validates an agent result object against schema, status, and data/error envelope rules to produce an explicit accept or reject decision before payment or delivery acceptance.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/agent-result-envelope-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-result-envelope-check-8bd019e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_np-L8l3TNwwyLJxJefZ_s

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agent-result-envelope-check-8bd019e4 -d '<json body>'
```

Example prompt: Before I accept and pay for this agent result, run an envelope check on it — validate the schema, status, and data fields to confirm it passes or tell me what mismatches exist.

## When to prefer this

Use this endpoint when you need a lightweight, local, in-memory validation of an agent result envelope before committing to payment or accepting a delivery — especially in x402 workflows where accepting a bad result has financial consequences. Prefer this over manual inspection when you need structured mismatch reasons and normalized evidence rather than raw schema diff.

## Known failure modes

- Result object exceeds maxProperties limit of 128 — returns validation error
- Malformed or missing required envelope fields cause schema rejection
- Caller-supplied result contains inconsistent status and data fields — surfaces as mismatch reasons
- Empty result object passed — may return rejection with no substantive evidence

## How this service works

Agent Result Envelope Check: Agent Result Envelope Check checks a generic agent result for schema, status, and data or error from bounded caller-supplied values without an external provider. Call Agent Result Envelope 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 Envelope Check as v…

## Output

Returns contract-specific validation checks, normalized evidence, an explicit accept or reject status, and a list of mismatch reasons explaining why a result passed or failed envelope validation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "result": {
   "type": "object",
   "description": "Result supplied to Agent Result Envelope Check; used only for this bounded calculation and processed in memory without retention.",
   "maxProperties": 128,
   "additionalProperties": true
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "valid": true,
   "missing_fields": [],
   "has_data_or_error": true
  },
  "schema": "delx/util-agent-result-envelope-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "c30da2c0725b81b5ab82ab69c3268cdbd81eff1c80cf99cf2fe58603f665419f",
   "external_calls": 0
  },
  "operation": "delivery_contract:agent_result_envelope_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-result-envelope-check-8bd019e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)