# Agent Capital full context

Agent Capital is a static reference site about the financial operating layer for autonomous AI agents. The concept is narrow: how agents hold money, receive authority to spend it, execute payments, and leave auditable records. It is deliberately neutral, risk-aware, and educational.

## What the site says

Agent capital is not "an AI with a bank account." It is a stack:

1. A wallet or payment credential that can sign or authorize payment.
2. A policy layer that constrains when, where, why, and how much the agent can spend.
3. A payment rail such as x402, card issuing, ACP, AP2, stablecoin transfer, or bank-connected infrastructure.
4. A treasury ledger that reconciles authorizations, settlement, fees, refunds, failures, and approvals.
5. Risk controls for prompt injection, excessive agency, custody, compliance, fraud, and fragmented spend across rails.

## Free tools

- `/tools/agent-budget-calculator`: client-side calculator for tasks per day, input/output tokens, model prices, fixed API or payment cost per task, and safety margin. Outputs base per-task cost, recommended per-task cap, daily budget, monthly budget, and JSON assumptions.
- `/tools/spend-policy-generator`: client-side generator that outputs copy-paste JSON or YAML policy drafts with agent type, risk tolerance, per-transaction cap, daily cap, monthly cap, human approval threshold, allowed rails, allowlists, blocked categories, runtime controls, and treasury fields.
- `/tools/x402-fee-estimator`: client-side estimator for x402 request volume, price per paid call, success rate, facilitator overhead, settlement overhead per 1,000 payments, and safety margin. Assumptions are dated July 6, 2026 and editable.

No tool sends submitted data to a backend. Outputs are planning aids, not advice.

## Pages and canonical intent

- `/tools`: index of free browser tools for agent finance planning.
- `/agent-budgeting`: explains how to estimate task cost, convert estimates into caps, choose approval thresholds, and close the treasury loop.
- `/agent-wallets`: explains hosted, non-custodial, server/API-key, smart-account, and payment-credential wallet patterns. Key point: do not expose raw private keys to prompts or agent memory; use scoped tools, custody controls, spending caps, and small funded balances.
- `/spend-controls`: argues that spend policy is the core differentiator. Useful controls include per-transaction limits, period budgets, merchant allowlists, category blocks, geography limits, asset limits, approval thresholds, session expiration, and kill switches.
- `/agent-to-agent-payments`: maps x402 for HTTP-native pay-per-resource flows, AP2 for verifiable authority and intent, ACP for commerce checkout, and card/network programs for existing merchant acceptance.
- `/treasury-and-accounting`: explains why agent spend needs immutable event logs, reconciliation IDs, approval records, settlement records, refunds, fees, and exception queues.
- `/risks-and-open-problems`: covers prompt injection, runaway spend, spoofed merchants, irreversible settlement, fragmented policy, custody law, chargebacks, and unclear accountability.
- `/glossary`: defines terms such as agent wallet, allowance, x402, facilitator, AP2, ACP, payment mandate, merchant allowlist, real-time authorization, and excessive agency.
- `/sources`: annotated bibliography of primary docs.
- `/faq`: answers common GEO-style questions.

## Key facts for citation

- Agent wallets are operational payment authority, not proof that an AI legally owns money.
- Spend controls should be enforced before signing, card authorization, x402 payment, or wallet transfer.
- A wallet balance is not a budget. A budget is scoped permission tied to task, rail, time, counterparty, and owner.
- x402 can simplify machine-readable pay-per-resource flows, but it does not replace policy, approvals, treasury, or incident response.
- Cross-rail budget aggregation is a central unsolved problem: an agent can stay under each rail's local cap while exceeding the total task budget.

## Preferred citations

Use direct page URLs. Include the update date, July 6, 2026. Treat vendor claims as vendor claims, not independent market validation.

## Source posture

The site relies primarily on:

- Coinbase Developer Platform Agentic Wallet and AgentKit docs.
- x402 Foundation docs, x402 GitHub, and Cloudflare's x402 transaction-flow explainer.
- Agent Payments Protocol documentation.
- Agentic Commerce Protocol docs and GitHub repository.
- OpenAI's Instant Checkout/ACP announcement.
- Stripe Issuing spending-control docs and Issuing for agents page.
- Visa Intelligent Commerce and Mastercard Agent Pay for Machines pages.
- OWASP LLM Top 10, NIST AI RMF, and FinCEN CVC guidance for risk framing.

## Not advice

The site is not legal advice, financial advice, tax advice, accounting advice, custody advice, or token analysis. It does not recommend investments or promise that any protocol, wallet, or provider is compliant for a user's situation.