{
  "checked_at": "2026-10-27",
  "intro": "One row per service or standard that sells to software agents. Accepts, status and source were read from the page named in the row on the date shown. No payment was made to verify settlement.",
  "scope": "Loop XXI builds on Bitcoin and Lightning. This list also covers services on rails we do not use.",
  "services": [
    {
      "id": "x402",
      "name": "x402",
      "kind": "protocol",
      "operator": "x402 Foundation",
      "what": "An open standard that turns HTTP 402 into a payment handshake, so a server can charge per request.",
      "accepts": [
        "whatever networks the seller enables"
      ],
      "accepts_note": "The standard is network-neutral. The seller chooses which networks and payment schemes to accept, so the standard itself names no asset.",
      "status": "live",
      "status_note": "The project publishes its own rolling transaction, volume, buyer and seller totals.",
      "source": "https://x402.org",
      "checked": "2026-10-27"
    },
    {
      "id": "cdp-x402",
      "name": "Coinbase CDP x402 facilitator",
      "kind": "service",
      "operator": "Coinbase",
      "what": "A hosted facilitator that verifies and settles x402 payments on a seller's behalf.",
      "accepts": [
        "USDC",
        "other ERC-20 tokens on EVM networks",
        "SPL tokens on Solana"
      ],
      "accepts_note": "Its documentation calls USDC the most common asset and says sellers may accept other tokens.",
      "status": "live",
      "status_note": "Its documentation reports more than 100 million x402 payments settled across Base and Solana.",
      "source": "https://docs.cdp.coinbase.com/x402/welcome",
      "checked": "2026-10-27"
    },
    {
      "id": "mpp",
      "name": "Machine Payments Protocol (MPP)",
      "kind": "protocol",
      "operator": "co-authored by Tempo and Stripe",
      "what": "An open standard for machine-to-machine payments over HTTP 402, published as an IETF draft.",
      "accepts": [
        "stablecoins",
        "cards",
        "bank transfers"
      ],
      "accepts_note": "Payment methods published so far cover Tempo, Stripe, EVM, card, Lightning and Solana. Each rail maintains its own method.",
      "status": "live",
      "status_note": "Stripe documents charging for tool calls and HTTP requests over MPP.",
      "source": "https://mpp.dev",
      "checked": "2026-10-27"
    },
    {
      "id": "ap2",
      "name": "Agent Payments Protocol (AP2)",
      "kind": "protocol",
      "operator": "FIDO Alliance",
      "what": "An open protocol for agent commerce, published as an extension to the Agent2Agent protocol.",
      "accepts": [
        "cards",
        "x402"
      ],
      "accepts_note": "Taken from the protocol's own sample flows, which cover cards and x402 with and without a human present.",
      "status": "spec",
      "status_note": "A v0.2 specification and sample flows are published.",
      "source": "https://ap2-protocol.org",
      "checked": "2026-10-27"
    },
    {
      "id": "l402",
      "name": "L402",
      "kind": "protocol",
      "operator": "Lightning Labs",
      "what": "An open protocol for paying for API access over the Lightning Network with a macaroon and an invoice.",
      "accepts": [
        "Lightning (BOLT11 invoices)"
      ],
      "accepts_note": "The credential is a macaroon bound to the invoice payment hash, so no account or session is needed.",
      "status": "live",
      "status_note": "19 paid Lightning transactions across 8 L402 services, cumulative to 27 October 2026, seen through one public proxy.",
      "status_source": "https://l402.space",
      "source": "https://github.com/lightninglabs/L402",
      "checked": "2026-10-27"
    },
    {
      "id": "stripe",
      "name": "Stripe agentic commerce",
      "kind": "service",
      "operator": "Stripe",
      "what": "Card payments and machine payments for agents, including a wallet an agent can pay from.",
      "accepts": [
        "cards",
        "machine payments over MPP and x402"
      ],
      "accepts_note": "Its documentation lists an agent wallet, embedded commerce, and charging for tool calls and HTTP requests.",
      "status": "live",
      "status_note": "Its documentation warns that availability, launch stage and supported countries vary by integration.",
      "source": "https://docs.stripe.com/agentic-commerce",
      "checked": "2026-10-27"
    },
    {
      "id": "skyfire",
      "name": "Skyfire",
      "kind": "service",
      "operator": "Skyfire",
      "what": "An agent identity token plus a wallet and checkout, so an agent can log in and pay at a merchant.",
      "accepts": [
        "Visa",
        "Mastercard",
        "Discover",
        "USDC"
      ],
      "accepts_note": "Its site lists these card networks and USDC for agent checkout.",
      "status": "live",
      "status_note": "Its site presents agent checkout as available now and offers a launch control; it publishes no transaction volume.",
      "source": "https://www.skyfire.xyz",
      "checked": "2026-10-27"
    },
    {
      "id": "tempo",
      "name": "Tempo",
      "kind": "service",
      "operator": "Tempo",
      "what": "A payments chain for stablecoins, with machine payments supported as a first-class product.",
      "accepts": [
        "stablecoins on Tempo (TIP-20 tokens)"
      ],
      "accepts_note": "Its documentation describes stablecoin accounts, routing and machine payments, and MPP's Tempo method signs TIP-20 transfers.",
      "status": "live",
      "status_note": "Its documentation describes production products alongside a testnet for development.",
      "source": "https://docs.tempo.xyz",
      "checked": "2026-10-27"
    }
  ]
}