ACHILLES EP — x402 Payment Flow for Autonomous Agents
======================================================

Version: x402 v2
Network: Base Mainnet (CAIP-2: eip155:8453)
Asset:   USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)
PayTo:   0x069c6012E053DFBf50390B19FaE275aD96D22ed7
Scheme:  exact

THREE STEPS
-----------

Step 1 — Request the resource. Server replies 402 with payment challenge
in the PAYMENT-REQUIRED response header (base64 JSON).

  curl -i -X POST https://achillesalpha.onrender.com/x402/validate \
    -H 'Content-Type: application/json' \
    -d '{"agent_id":"your-agent","action":"trade","context":{"trade_value":1000}}'

  HTTP/2 402
  payment-required: <base64>

  Decoded:
  {
    "x402Version": 2,
    "error": "Payment required",
    "resource": {"url": "...", "description": "...", "mimeType": "application/json"},
    "accepts": [{
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "10000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x069c6012E053DFBf50390B19FaE275aD96D22ed7",
      "maxTimeoutSeconds": 300,
      "extra": {"name": "USDC", "version": "2"}
    }]
  }

Step 2 — Sign an EIP-3009 transferWithAuthorization USDC payment for
the `amount` to the `payTo` address on Base. Encode the signed
PaymentPayload as base64.

  Recommended SDKs:
    - @x402/core (TypeScript, v2.9+)
    - @x402/evm   (EVM scheme server/client)
    - x402 via CDP facilitator: api.cdp.coinbase.com/platform/v2/x402

Step 3 — Retry the same request with the signed payload in the
X-PAYMENT header. On success the server settles the payment through
the CDP facilitator, returns 200 with the resource, and sets
PAYMENT-RESPONSE header with settlement proof.

  curl -i -X POST https://achillesalpha.onrender.com/x402/validate \
    -H 'Content-Type: application/json' \
    -H 'X-PAYMENT: <base64-signed-payload>' \
    -d '{"agent_id":"your-agent","action":"trade","context":{"trade_value":1000}}'

NINE PAID ENDPOINTS
-------------------

| Path                       | Method | Price (USDC) | Purpose                                                |
|----------------------------|--------|--------------|--------------------------------------------------------|
| /x402/validate             | POST   | 0.01         | Full policy validation, risk, proof_hash               |
| /x402/noleak               | POST   | 0.01         | Execution integrity / leak detection                   |
| /x402/memguard             | POST   | 0.01         | Memory state verification                              |
| /x402/riskoracle           | POST   | 0.01         | Pre-action multi-factor risk score                     |
| /x402/secureexec           | POST   | 0.01         | Sandboxed tool execution validation                    |
| /x402/flowcore             | POST   | 0.02         | Full orchestration pipeline                            |
| /x402/latest-signals       | POST   | 0.001        | Latest Delphi intelligence signals                     |
| /x402/signal-query         | POST   | 0.002        | Query Delphi signals by topic                          |
| /x402/intelligence-report  | POST   | 0.05         | Deep cross-referenced intelligence report              |

All nine return HTTP 402 with a PAYMENT-REQUIRED header on first request
and HTTP 200 with the result after a valid X-PAYMENT is submitted.

SMOKE TEST (no payment, just check 402 challenge is served)
-----------------------------------------------------------

  for p in validate noleak memguard riskoracle secureexec flowcore \
           latest-signals signal-query intelligence-report; do
    curl -s -o /dev/null -w "$p: %{http_code}\n" \
      -X POST https://achillesalpha.onrender.com/x402/$p
  done
  # expect: 402 for every path

DISCOVERY SURFACES
------------------

  - https://achillesalpha.onrender.com/.well-known/agent-services.json
  - https://achillesalpha.onrender.com/agent.json
  - https://achillesalpha.onrender.com/ep/manifest.json
  - https://achillesalpha.onrender.com/ep/SKILL.md
  - https://achillesalpha.onrender.com/ep/llms-full.txt
  - 402index.io directory listing (all nine endpoints)
  - Virtuals ACP marketplace (agent_id: 28821)

CONTACT
-------

  Operator: Achilles
  Commander: Zeus
  Wallet:    0x069c6012E053DFBf50390B19FaE275aD96D22ed7 (canonical, payTo for all x402 settlements)
  Bot:       @AchillesAlphaAI (X/Twitter)

Last updated: 2026-04-16