---
name: agentgate-x402
version: 1.1.0
description: Deterministic AI micro-utilities with four free calls, then verified per-call USDC payment on Base L2 or Solana.
homepage: https://x402.agentsea.vn
payment_guide: https://x402.agentsea.vn/pay
tags: [x402, usdc, base, solana, web-scraping, prompt-guard, token-security, agent-utilities]
---

# AgentGate — Agent Payment Contract

Base URL: `https://x402.agentsea.vn`

Read the complete live payment contract first: `https://x402.agentsea.vn/pay`

## Discovery

- A2A card: `https://x402.agentsea.vn/.well-known/agent-card`
- x402 manifest: `https://x402.agentsea.vn/.well-known/x402`
- OpenAPI: `https://x402.agentsea.vn/openapi.json`
- Remote MCP: `https://x402.agentsea.vn/mcp`

## Mandatory payment flow

1. POST normally. AgentGate automatically grants four free calls per endpoint group.
2. On HTTP `402`, Base64-decode the `Payment-Required` header. Select exactly one `accepts[]` payment term.
3. Send the term's exact canonical USDC transfer on its network to `payTo`; await confirmation.
4. Retry the identical method, endpoint, and body with:

```http
X-PAYMENT: {"txHash":"<confirmed transaction hash>","network":"<selected accepts[].network>"}
```

One confirmed transaction hash redeems one call. Reusing it returns HTTP 402. Paid calls bypass the unpaid request rate limit.

## Current settlement paths

| Network | Canonical USDC asset | Recipient |
|---|---|---|
| Base L2 `eip155:8453` | `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` | `0x2965570f64c9c2FB5b9c09bf36529A6438696969` |
| Solana Mainnet `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` | `EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v` | `TediZmm6dE7Q1pU6FjwCs9uRT4UVx8uPWk8SDCSHkaF` |

The live 402 `accepts[]` terms are authoritative for amount, asset, network, and recipient. USDC has six decimals: `5000` atomic units = `$0.005`.

## Important compatibility boundary

Current gateway verification accepts **confirmed on-chain USDC transfer transaction hashes**. Do not send seed phrases, private keys, raw unsigned x402 authorizations, or a bearer MPP credential. A CDP Facilitator / native MPP settlement route will be advertised in the 402 response only after it is actually deployed.

## Endpoints & current pricing

| Endpoint | Base | Solana |
|---|---:|---:|
| `POST /v1/scrape/clean-markdown` | $0.005 | $0.001 |
| `POST /v1/guard/prompt-injection-check` | $0.002 | $0.001 |
| `POST /v1/intel/enrich-domain` | $0.010 | $0.003 |
| `POST /v1/solana/token-security` | $0.010 | $0.002 |
| `POST /v1/signals/token` | $0.010 | $0.003 |
| `POST /v1/code/triage-issue` | $0.020 | $0.005 |
| `POST /v1/audit/aeo-ready` | $0.050 | $0.005 |

## MCP

Discover tools before calling:

```bash
curl -s -X POST https://x402.agentsea.vn/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'
```