XAPS — pre-execution audit for value moves

XAPS is a live Tollbooth. It does not wrap x402 or hold funds. It issues a portable receipt before an agent signs, pays, or settles.

• Payers attach X-XAPS-Receipt.
• Payees and facilitators clear that id themselves (no agent key).
• Refuse value unless clear is true, use_case is value_move, and amount / pay_to / resource match this 402.

External cost (Tollbooth, not this skill): about $0.01 per approved payer audit. Register at POST https://api.xaps.network/agents/register.

The fee buys an attested decision (APPROVED / REJECTED) over a payload_hash. It is not insurance, not custody, not settlement, and not a warranty that the action is safe. XAPS does not sign, send, or settle the value. A wrong call is a wrong opinion; the agent that executes still owns the loss. Independent clear only proves this receipt exists, is value_move, and matches this 402 — not that the payment is good.

When to use

Use this skill when the agent is about to:

• sign or retry an x402 payment (wrapFetchWithPayment, X-Payment)
• send, sign, or submit a wallet/tx
• settle or fulfill paid work from another agent

Do not use it for GitHub issues, docs, or read-only lookup.

Payer — audit then attach

Requires XAPS_AGENT_KEY. Fail closed if status is not APPROVED.

BASE="${XAPS_API_URL:-https://api.xaps.network}"
RECEIPT="$(curl -sS -X POST "$BASE/verify" \
  -H "Content-Type: application/json" \
  -H "X-Agent-Key: $XAPS_AGENT_KEY" \
  -d "{\"payload\":{\"action\":\"sign_x402_payment\",\"use_case\":\"value_move\",\"amount\":AMOUNT,\"pay_to\":\"PAY_TO\",\"resource\":\"RESOURCE_URL\"}}")"

Proceed only when audit.status is APPROVED. Put receipt_id on header X-XAPS-Receipt. No receipt → no sign.

Python:

from xaps import XapsClient, XapsRejectedError
receipt = XapsClient(base_url="https://api.xaps.network").audit(
    action="sign_x402_payment",
    use_case="value_move",
    amount=float(AMOUNT),
)
if receipt["audit"]["status"] != "APPROVED":
    raise XapsRejectedError(receipt["audit"].get("beta_attack", "REJECTED"), receipt=receipt)
# attach receipt["receipt_id"] as X-XAPS-Receipt

Payee / facilitator — clear independently

No agent key. Call this on the counterparty, not the payer.

BASE="${XAPS_API_URL:-https://api.xaps.network}"
curl -sS -X POST "$BASE/receipts/clear" \
  -H "Content-Type: application/json" \
  -d "{\"receipt_id\":\"RECEIPT_ID\",\"require_use_case\":\"value_move\",\"amount\":AMOUNT,\"pay_to\":\"PAY_TO\",\"resource\":\"RESOURCE_URL\"}"

Refuse unless clear is true. Mismatched amount / pay_to / resource fail closed.

Python:

from xaps import require_value_clearance
require_value_clearance(receipt_id, amount=AMOUNT, pay_to=PAY_TO, resource=RESOURCE_URL)

References

• Node: https://api.xaps.network
• Agent card: https://api.xaps.network/.well-known/xaps-agent-card.json
• SDK: https://github.com/APMC1/xaps-sdk (independent_clearance, require_value_clearance)
• MCP: io.github.APMC1/xaps