# Synthex Forge Identity Control Proof Attestation

> Synthex Forge Identity Control Proof Attestation is a paid API for AI agents from x402.synthexforge.com, paid per call via x402, $0.2/call, status unknown (last checked 2026-10-23).

Accepts structured evidence of identifier control (wallet address, DID, or public key) and returns a signed attestation proving documented control over that identifier.

## Facts

- Endpoint: POST https://x402.synthexforge.com/v1/identity/control-proof?utm_source=zero.xyz
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthex-forge-identity-control-proof-attestation-e523f0c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xs-VPLSuAMyly3tinvLP8

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 synthex-forge-identity-control-proof-attestation-e523f0c3 -d '<json body>'
```

Example prompt: I need a signed control-proof attestation for wallet address 0xAbC123... using the signed-challenge method — here's the challenge and signature as my control evidence, and the claimer is 'Alice Corp'.

## When to prefer this

Choose this endpoint when you need a cryptographically signed, Ed25519-attested proof-of-control over a wallet address, DID, or public key — especially for governance, credential issuance, or compliance workflows that require a tamper-evident artifact rather than just a boolean verification. Prefer it over generic signature-check utilities when you need a durable, on-record attestation artifact rather than an ephemeral check.

## Known failure modes

- Missing required 'identifier' field returns validation error
- Unsupported 'control_method' value causes rejection
- Malformed or insufficient 'control_evidence' object leads to attestation failure
- Payment not received or invalid USDC transaction on Base mainnet (chain ID 8453) results in HTTP 402 payment-required response
- Invalid or expired signed challenge in control_evidence causes signature verification failure

## How this service works

Synthex Forge x402 Receive: 41 paid verification, attestation and governance endpoints (Ed25519 + SHA-256 signed artifacts) plus free verify/public-key/standard sibling routes. Paid routes answer HTTP 402 with an x402 v2 `payment-required` envelope (atomic USDC on Base mainnet, chain ID 8453). Free routes are declared with `security: []` per the x402scan discovery spec.

## Output

A JSON response with an 'ok: true' confirmation, backed by an Ed25519-signed, SHA-256-hashed artifact attesting that the specified identifier is under documented control by the claimer — not a KYC assertion, purely a control attestation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "claimer": {
   "type": "string",
   "description": "Optional who/entity asserting the claim (carried verbatim)."
  },
  "identifier": {
   "type": "string",
   "description": "The controlled identifier (wallet address / DID / public key)."
  },
  "control_method": {
   "type": "string",
   "description": "How control is documented: 'signed-challenge' | 'did-bind' | 'key-position' | 'credential'."
  },
  "control_evidence": {
   "type": "object",
   "description": "Structured control evidence the caller presents (challenge+signature, DID document, key reference, credential-like object, or an open list of signals). Non-determinative — asserts DOCUMENTED CONTROL, never KYC/identity."
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthex-forge-identity-control-proof-attestation-e523f0c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.synthexforge.com](https://www.zero.xyz/host/x402.synthexforge.com/llms.txt)