# Agent Result Schema Version Check

> Agent Result Schema Version Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Validates a result schema identifier against a list of supported schema versions to accept or reject an agent delivery

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/agent-result-schema-version-check
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-result-schema-version-check-aa56fbfc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FU6MIU1MRVM2WWpsBb19B

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-schema-version-check-aa56fbfc -d '<json body>'
```

Example prompt: Before I accept and pay for this agent delivery, check whether its result schema version 'v2.1.0' is supported — my accepted versions are ['v2.0.0','v2.1.0','v3.0.0'].

## When to prefer this

Use this endpoint when you need a lightweight, in-memory, stateless check to verify whether a caller-supplied schema version string matches any entry in your supported versions list before accepting or paying for an x402 agent delivery. Prefer this over custom logic when you need explicit mismatch reasons and normalized evidence rather than a simple boolean comparison.

## Known failure modes

- Schema string exceeds 8192 character limit — request rejected
- Supported versions array exceeds 256 items — request rejected
- Malformed or missing schema field — validation error returned
- Empty supported versions list — result likely rejected with mismatch reason
- Schema identifier format unrecognized — normalized evidence may indicate parse failure

## How this service works

Agent Result Schema Version Check: Agent Result Schema Version Check checks a result schema identifier against supported versions from bounded caller-supplied values without an external provider. Call Agent Result Schema Version 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 Schema V…

## Output

Returns an explicit acceptance or rejection status, contract-specific check results, normalized evidence from the schema comparison, and mismatch reasons explaining why the schema version was accepted or rejected against the supported versions list.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string",
   "maxLength": 8192,
   "description": "Schema supplied to Agent Result Schema Version Check; used only for this bounded calculation and processed in memory without retention."
  },
  "supported": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Supported supplied to Agent Result Schema Version Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "schema": "example/result/v1",
   "supported": true
  },
  "schema": "delx/util-agent-result-schema-version-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "574438cd9e35b933fd023becde42242fff15965a01b654dbf0c200677a9202e9",
   "external_calls": 0
  },
  "operation": "delivery_contract:agent_result_schema_version_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-result-schema-version-check-aa56fbfc/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)