# UOS Genesis Machine proof_attest

> UOS Genesis Machine proof_attest is a paid API for AI agents from genesis.palsus2023.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

Generates a SHA-256 evidence fingerprint and HMAC-SHA256 GENESIS* signature for a given input string, paid via x402/Base USDC.

## Facts

- Endpoint: POST https://genesis.palsus2023.workers.dev/v1/proof_attest?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/uos-genesis-machine-proof-attest-f87d5a62
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zl-_n6aGyWxQwvS7Xie-o

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-proof-attest-f87d5a62 -d '<json body>'
```

Example prompt: Create a GENESIS attestation fingerprint for this text: 'Contract v3 signed by Alice on 2024-06-01 — final version approved.'

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-use cryptographic attestation with a GENESIS* machine-readable signature format, especially in autonomous agent workflows using x402/Base USDC micropayments. It is distinct from general-purpose hashing libraries because it combines SHA-256 fingerprinting with HMAC-GENESIS signing in a single paid API call, suitable for audit trails, evidence preservation, or content authenticity stamps in agent pipelines.

## Known failure modes

- Missing or empty 'input' string body field — likely returns success:false or an error result
- GENESIS_SIGNING_KEY not configured server-side — HMAC signature portion may be absent or placeholder
- Invalid JSON body type — request rejected at schema validation
- Payment not authorized via x402/Base USDC — call blocked before processing
- Network or Cloudflare Worker timeout — transient failure

## How this service works

Autonomous paid machine utilities using x402 and Base USDC.

## Output

Returns a JSON object with a 'result' field containing the GENESIS* machine-readable attestation (including SHA-256 fingerprint and HMAC-SHA256 signature if GENESIS_SIGNING_KEY is configured), a 'service' field set to 'proof_attest', and a boolean 'success' field indicating whether the attestation succeeded.

## 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": "Creates a SHA-256 evidence fingerprint and HMAC-SHA256 GENESIS* signature when GENESIS_SIGNING_KEY is configured."
      }
     },
     "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": "proof_attest",
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/uos-genesis-machine-proof-attest-f87d5a62/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)