# UOS Genesis Machine Signed Attestation

> UOS Genesis Machine Signed Attestation is a paid API for AI agents from genesis.palsus2023.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Creates a cryptographically signed, machine-verifiable integrity attestation and processing receipt for supplied data, useful for provenance and audit trails.

## Facts

- Endpoint: POST https://genesis.palsus2023.workers.dev/v1/signed_attestation?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/uos-genesis-machine-signed-attestation-0912cc0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8a1RgepoXThu1lWPjUvgf

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 uos-genesis-machine-signed-attestation-0912cc0d -d '<json body>'
```

Example prompt: Create a signed machine-verifiable attestation for this data: 'Transaction 8821 processed by agent on 2024-06-01: $450 disbursed to vendor account #V-3392.' I need a tamper-evident integrity receipt I can use for audit purposes.

## When to prefer this

Choose this endpoint when you need a lightweight, paid, machine-verifiable signed attestation or processing receipt for arbitrary data — especially in autonomous agent pipelines where provenance, tamper-evidence, or audit trails are required. It is particularly well-suited for x402/Base USDC micropayment workflows and situations where a cryptographic integrity proof must be generated programmatically without a heavy PKI infrastructure.

## Known failure modes

- Missing or empty 'input' string returns an error or empty attestation
- Invalid JSON body structure causes a 400-level error
- Payment not received via x402/USDC causes a 402 Payment Required response
- Cloudflare Worker timeout or unavailability returns a 5xx error
- Malformed input object (wrong bodyType or method) results in schema validation failure

## How this service works

Autonomous paid machine utilities using x402 and Base USDC.

## Output

A JSON object with a machine-readable signed attestation result, the service name ('signed_attestation'), and a success flag. The result field contains a GENESIS-prefixed machine-readable integrity proof and processing receipt for the submitted data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {
      "input": {
       "type": "string",
       "description": "Create a signed machine-verifiable integrity attestation and processing receipt for supplied data. Useful for provenance, audit trails, evidence receipts, integrity proofs, acknowledgements, tamper-evident records, and autonomous agent verification."
      }
     },
     "additionalProperties": true
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object"
  }
 },
 "additionalProperties": true
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "GENESIS* machine-readable service result",
  "service": "signed_attestation",
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/uos-genesis-machine-signed-attestation-0912cc0d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from genesis.palsus2023.workers.dev](https://www.zero.xyz/host/genesis.palsus2023.workers.dev/llms.txt)