Agent payments reads like one category and behaves like four. The names travel together in coverage, but the systems answer different questions, and picking between them starts with knowing which question your transaction is asking.
This page is the map. Each comparison below has its own article with a side-by-side table, the conflations to avoid, and primary sources with a last-verified date.
The layers
The category splits into three layers: authorization decides whether an agent may spend, access decides whether an agent gets in the door, and settlement decides where the money ends up between two parties. Most systems live on one layer and delegate the rest. That is the functional cut; the same systems arranged by position, Level 0 through Level 3, are mapped in What is the agent commerce stack?.
AGIRAILS vs Nevermined turns on orchestration versus settlement. Nevermined takes a human's budget, hands bounded spending authority to an agent, and meters what merchants sell to machines, routing money over card, stablecoin, or credit rails. ACTP is the layer underneath that story: two agents settling work in escrow, with no company holding the funds.
AGIRAILS vs Google AP2 turns on evidence versus enforcement. AP2 is a specification, not a rail: signed mandates document what a human approved, and existing processors move the money. ACTP moves the money itself, under contract rules that need no one's signature to hold.
AGIRAILS vs Skyfire is identity versus structure, and the two claim the same transaction: both settle work between agents. Skyfire verifies the human behind an agent (KYA) and runs payments from prepaid balances on its own ledger, with sellers charging after delivery. ACTP asks nothing about who the agents are; the escrow carries the risk instead.
AGIRAILS vs Coinbase x402 is the odd one out: AGIRAILS bundles x402 into its SDK, with no added fee, so the comparison happens inside one product rather than between vendors. x402 pays for a response that arrives together with the payment; ACTP escrows work where delivery comes later, with attestation, disputes, and reputation guarding the wait.
AGIRAILS vs Stripe ACP exists because the acronyms keep colliding: ACP (OpenAI and Stripe's Agentic Commerce Protocol) and ACTP sit one letter apart. ACP gives a human's agent a checkout lane at real merchants, card token and all; ACTP settles work between the agents themselves. A store with an agent at the door versus an economy with agents on both sides.
AGIRAILS vs Virtuals ACP is the family reunion: the only other agent-to-agent USDC escrow on Base. Virtuals resolves jobs through an evaluator the client picks, inside its own agent ecosystem; ACTP leaves uncontested jobs alone and reserves its bonded court for actual disagreements.
At a glance
| System | What it is | What it trusts | Read this if |
|---|---|---|---|
| AGIRAILS ACTP | Settlement protocol; contracts on Base | The contract: escrow, state machine, on-chain record | You are here |
| Nevermined | Hosted orchestration platform | The human's mandate, enforced by the platform | A human or business delegates agent spend: comparison |
| Google AP2 | Open authorization spec (FIDO-governed) | The human's signature, as evidence for existing rails | You need industry-recognized proof of authorization: comparison |
| Skyfire | Identity-first payments platform | The verified identity behind the agent | Agents blocked at enterprise gates need verified identity: comparison |
| Coinbase x402 | Open HTTP payment standard (Foundation-governed) | Payment and delivery in one instant exchange | Agents pay per request, and AGIRAILS ships it natively: comparison |
| Stripe ACP | Agent checkout standard (OpenAI/Stripe) | The human's confirmation and card, on merchant rails | A human shops through an agent at real merchants: comparison |
| Virtuals ACP | Agent-to-agent escrow in the Virtuals ecosystem | A per-job reviewer the client chooses | Your agent lives on Virtuals and trades in-network: comparison |
Where this connects
The mechanism every comparison keeps returning to: What is agent escrow?
The property that separates a contract from a platform ledger: What is non-custodial settlement?
The rail itself: agirails.io