# HumanMirror Execution Receipt

> HumanMirror Execution Receipt is a paid API for AI agents from humanmirror.fr, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Creates and verifies a cryptographic execution receipt for an AI-agent tool call or input/output pair, providing deterministic execution provenance.

## Facts

- Endpoint: POST https://humanmirror.fr/api/x402/execution-receipt/?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/humanmirror-execution-receipt-fcb81637
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t3zul8hFEECNpBKZEHUL1

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 humanmirror-execution-receipt-fcb81637 -d '<json body>'
```

Example prompt: Generate a cryptographic execution receipt for the tool call I just made — the input was the customer lookup query and the output was the returned JSON profile — so I have tamper-evident provenance for this agent action.

## When to prefer this

Choose this endpoint when you need tamper-evident, cryptographically verifiable proof that a specific AI-agent tool call or input/output pair occurred — particularly for compliance, auditing, multi-agent handoffs, or replay verification. Prefer this over simple logging when the integrity of the record itself must be independently verifiable and the record must be deterministic across identical inputs.

## Known failure modes

- Malformed or missing tool call payload causes 400 Bad Request
- Payment failure or insufficient USDC balance returns 402 Payment Required
- Non-deterministic or unstable input data may produce unreliable receipts
- Receipt verification mismatch if payload was mutated between creation and verification
- Timeout if the execution payload is excessively large

## How this service works

Create and verify a cryptographic execution receipt for an AI-agent tool call or input/output pair, providing deterministic execution provenance.

## Output

Returns a cryptographic execution receipt containing a deterministic fingerprint, timestamp, and attestation of the tool call or input/output pair, enabling third parties to verify that a specific agent action occurred with specific data without being able to alter the record.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "input"
     ],
     "properties": {
      "input": {
       "description": "JSON-serializable input for this deterministic outcome."
      },
      "options": {
       "type": "object",
       "description": "Optional tool-specific options."
      },
      "criteria": {
       "type": "object",
       "description": "Optional deterministic acceptance criteria."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "status": "verified_success",
  "product": "HumanMirror Execution Receipt"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/humanmirror-execution-receipt-fcb81637/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from humanmirror.fr](https://www.zero.xyz/host/humanmirror.fr/llms.txt)