Write the spend policy before the agent gets a wallet.

AgentCore Payments, x402, MPP, and Pay.sh move paid APIs into an agent's execution loop. This local builder turns a payment demo into concrete session caps, per-call limits, recipient allowlists, approval gates, receipt rules, metadata boundaries, and audit evidence.

build policy commerce gate metadata filter Pay.sh pulse source ledger

input: limits
output: policy JSON
privacy: browser only

agentcore.policy

$ policy build --rail x402
session.max: 5 USDC
call.max: 0.25 USDC
approval: required over limit
recipients: allowlist only
metadata: purpose codes only
receipts: required
result: launch policy + gaps

Project name Payment rail

Session cap Per-call cap Currency Expiry minutes

Allowed networks Recipient allowlist Allowed purpose codes

Controls Default to dry-run, testnet, or sandbox until manually promoted. Require human approval above the per-call cap or for new recipients. Validate recipient, network, asset, amount, and facilitator response before paying. Redact prompt text, PII, query tokens, and internal ids from payment metadata. Store receipts, denials, retries, and refund/dispute states. Reject reused payment payloads, expired sessions, and duplicate request ids. Use a dedicated low-balance wallet or payment instrument for the demo. Emit spend logs, metrics, and trace ids for every payment decision.

launch posture

The policy should be boring enough to survive a real user.

sample report

cap

Loss is bounded before execution.

Session and per-call ceilings should be enforced outside the prompt so a model cannot talk its way into more spend.

payee

The recipient is explicit.

New payees, changed networks, large amounts, and unknown facilitators should deny or pause until a human confirms.

memo

Metadata stays small.

Payment records should carry compact purpose codes, not full prompts, support tickets, emails, or hidden query strings.

audit

Every decision has evidence.

Receipts, denials, retries, traces, and refunds should explain what happened without exposing private user context.

source ledger

Why this tool exists now.

aws

AgentCore Payments preview

AWS announced AgentCore Payments preview on May 7, 2026 with Coinbase and Stripe, including session spending limits, observability, x402 negotiation, and paid MCP/API access.

open AWS note

docs

Payment sessions and instruments

The AgentCore docs describe payment sessions with configurable payment limits, expiry, instruments, and payment lifecycle orchestration.

open docs

cloudflare

Agentic payments over 402

Cloudflare's Agents docs frame x402 and MPP as protocols for agents purchasing resources through HTTP 402 payment flows.

open docs

quicknode

Paid infrastructure without accounts

Quicknode documents x402 and MPP as wallet-based protocols for applications and agents accessing blockchain infrastructure.

open docs