# Delivery Evidence

> Delivery Evidence is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Hashes and cryptographically attests supplied delivery evidence for tamper-proof verification

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/delivery-evidence
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delivery-evidence-d8db02f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0RBBx7enz5wNa-xlL70S0

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 delivery-evidence-d8db02f2 -d '<json body>'
```

Example prompt: Can you hash and attest this delivery evidence so I have a tamper-proof cryptographic record proving the output was delivered — here's the payload: {delivery_payload}

## When to prefer this

Use this endpoint when an AI agent or automated workflow needs a tamper-evident, cryptographically signed record that a delivery, task output, or action was completed. Prefer it over simple logging when downstream consumers or auditors need to independently verify that evidence has not been altered since creation. Especially suited for agentic pipelines where trust between steps must be established without a centralized authority.

## Known failure modes

- Empty or malformed evidence payload returns validation error
- Missing required fields in evidence object causes rejection
- Duplicate submission may produce a different hash if timestamps differ
- Network or signing service unavailability causes 5xx error
- Oversized payload may be rejected if evidence exceeds size limits

## How this service works

Hash and attest supplied delivery evidence

## Output

Returns a cryptographic hash and signed attestation of the supplied delivery evidence, providing an immutable, verifiable record that the delivery occurred and has not been tampered with.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delivery-evidence-d8db02f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phion.systems](https://www.zero.xyz/host/phion.systems/llms.txt)