# Stablecoin Issuer & Reserve Verifier

> Stablecoin Issuer & Reserve Verifier is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Verifies a stablecoin's issuer identity, GENIUS Act qualification status, and latest reserve attestation by resolving from chain+address, known symbol, or transaction hash

## Facts

- Endpoint: POST https://x402.freeq.one/tools/verify_stablecoin?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stablecoin-issuer-reserve-verifier-48c90342
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T9KGY87IjiW6KrKUHj2-a

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 stablecoin-issuer-reserve-verifier-48c90342 -d '<json body>'
```

Example prompt: Can you verify the GENIUS Act qualification status and latest reserve attestation for USDC on Base — use the known symbol USDC and give me the full issuer identity details?

## When to prefer this

Use this endpoint when you need to programmatically verify a stablecoin's regulatory compliance (GENIUS Act), confirm issuer identity, or retrieve the latest reserve attestation — especially useful for DeFi risk checks, compliance workflows, or due diligence before transacting with a stablecoin. Prefer this over generic blockchain explorers when GENIUS Act qualification status and reserve attestation are specifically needed.

## Known failure modes

- Unknown or unresolvable token address returns an error
- Unsupported chain identifier causes lookup failure
- Invalid transaction hash or tx with no ERC-20 Transfer log fails to resolve token
- Unrecognized symbol not in the known list returns an error
- Payment failure (x402) blocks full attestation call
- Reserve attestation data temporarily unavailable from issuer

## How this service works

Stablecoin Issuer / GENIUS / Reserve Verifier: Verify a stablecoin: issuer identity, GENIUS Act qualification status, and latest reserve attestation. Resolves the token from chain+address, a known symbol (USDC, USDT, PYUSD, USDS, FDUSD, USDe), or a tx hash. Free preview: preview=true validates the input and returns the issuer only — no payment required. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_stablecoin.

## Output

A JSON object containing the resolved stablecoin's issuer identity, GENIUS Act qualification status, and latest reserve attestation data. In preview mode (free), only input validation and issuer identity are returned without on-chain calls or attestation payload.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "description": "Chain for address lookup: base (default), ethereum, arbitrum, optimism, polygon"
  },
  "symbol": {
   "type": "string",
   "description": "Known symbol: USDC, USDT, PYUSD, USDS, FDUSD, USDe (alternative to address)"
  },
  "address": {
   "type": "string",
   "description": "Token contract address (0x + 40 hex). e.g. 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC on Base)"
  },
  "preview": {
   "type": "boolean",
   "description": "true = free registry-only check: input validation + issuer identity, no on-chain calls, no attestation payload. No payment required."
  },
  "tx_hash": {
   "type": "string",
   "description": "Transaction hash — resolves the token contract from the tx's ERC-20 Transfer log"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablecoin-issuer-reserve-verifier-48c90342/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.freeq.one](https://www.zero.xyz/host/x402.freeq.one/llms.txt)