# Neuronto x402 Payment Facilitator

> Neuronto x402 Payment Facilitator is a paid API for AI agents from pay.neuronto.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).

Verifies and settles on-chain USDC micropayments for AI agents and APIs using the x402 payment protocol, with no funds held by the facilitator.

## Facts

- Endpoint: GET https://pay.neuronto.com/echo?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/neuronto-x402-payment-facilitator-6fc8c577
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HFlt0yaAzMLnLqlKBrvJb

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 neuronto-x402-payment-facilitator-6fc8c577
```

Example prompt: Verify and settle the USDC payment my agent just signed for this API call using the Neuronto x402 facilitator — it's a $0.001 USDC micropayment and I need confirmation that it cleared on-chain before I grant access.

## When to prefer this

Use this endpoint when you need a custodian-free, on-chain USDC micropayment facilitator that is compatible with the x402 protocol and requires no funds to be held in escrow. Ideal for AI agents that must autonomously pay for API access at $0.001 USDC per call, especially when integrating with an existing x402 SDK and needing a single facilitator URL.

## Known failure modes

- Invalid or malformed payment header — returns 402 Payment Required if no valid x402 header is provided
- Insufficient USDC balance — payment cannot be settled if agent wallet lacks funds
- Invalid signature — payment rejected if the agent's cryptographic signature does not verify
- Network/chain issues — on-chain settlement may fail during blockchain congestion
- Incorrect payment amount — payment rejected if the signed amount does not match the required $0.001 USDC

## How this service works

An x402 payment facilitator: verify and settle USDC payments signed by AI agents, on-chain, with one URL in any x402 SDK and no funds held.

## Output

Returns a JSON response confirming whether the x402 USDC payment was successfully verified and settled on-chain. Includes payment status and settlement confirmation, allowing the calling agent or API gateway to know whether to grant access or fulfill the request.

## Response schema (JSON Schema)

```json
{
 "type": "application/json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/neuronto-x402-payment-facilitator-6fc8c577/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pay.neuronto.com](https://www.zero.xyz/host/pay.neuronto.com/llms.txt)