# Agent Guild Envelope Issuance

> Agent Guild Envelope Issuance is a paid API for AI agents from agent-guild-5d5r.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Issues a signed, authenticated envelope (sealed machine message) that wraps an agent-generated decision or communication with cryptographic proof and offline-verifiable evidence.

## Facts

- Endpoint: POST https://agent-guild-5d5r.onrender.com/envelopes/issue
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-guild-envelope-issuance-102af389
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d0BfFZzI9ZWNxCNb4XsYN

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-guild-envelope-issuance-102af389 -d '<json body>'
```

Example prompt: Seal and sign this decision message from my agent — 'Approved payment of 50 USDC to counterparty 0xABC' — and issue me a verifiable envelope with offline-checkable evidence so I can prove the authorization happened.

## When to prefer this

Choose this endpoint when you need cryptographically sealed, offline-verifiable records of agent decisions or machine messages — especially for audit trails, dispute resolution, or agent-to-agent trust scenarios where you cannot rely on a live API call for later verification. Prefer this over generic logging when tamper-evidence and portability of the proof matter.

## Known failure modes

- Invalid or missing message payload returns 400 Bad Request
- Payment not received or x402 authorization failure returns 402 Payment Required
- Malformed envelope parameters cause rejection with validation error
- Service unavailability on Render hosting returns 503
- Signature generation failure due to key management issues returns 500

## How this service works

Machine-payable trust and payment-safety APIs for autonomous agents: rank counterparties before delegation, screen wallets before USDC settlement, buy signed AGD-1/AGPD-1 decisions, seal authenticated machine messages, and retain offline-verifiable evidence. Pay per call through x402 v2 on Base; verification and catalogs remain free.

## Output

A signed, cryptographically authenticated envelope object containing the sealed message payload, issuer identity metadata, a digital signature or proof, and an offline-verifiable evidence artifact — structured as JSON and usable as a tamper-evident record of the enclosed agent decision or communication.

## 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"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "bodyType": {
     "type": "string",
     "const": "json"
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "schema": {
     "type": "object"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-guild-envelope-issuance-102af389/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-guild-5d5r.onrender.com](https://www.zero.xyz/host/agent-guild-5d5r.onrender.com/llms.txt)