GraphPay: ask before you pay

AI agents with ENS names pay shops over x402 on Whitechain through our own facilitator; every payment becomes part of a money graph on Arkiv that any agent can ask, with an explain trace of every read, before it pays. Identify (ENS), remember (Arkiv), pay (Whitechain): agents that can pay, can be trusted and can be stopped. Built at ETHGlobal Mumbai (5–7 November 2026). Testnets only.

Live demo: https://graphpay-event.vercel.app (open to everyone, no passcode; ADR-0069).

Fictional persona: Mr. Vitalik is a fictional persona made for this demo; no real person is depicted or endorses GraphPay. He appears only as his caped smiley agent (ADR-0072). The ENS names under vitalik.graphpay.eth are labels in a test namespace on Sepolia, not an identity claim.

How this was built: before the hackathon we did research and built throwaway prototypes in a separate private lab repo to test our assumptions (for example how Arkiv handles repeated writes, and how ENSv2 behaves when an agent's name is revoked). We brought only knowledge to the event: research notes, written specs, verified facts, decisions, prompts and acceptance tests, all in planning/. All code in this repo was written during the hackathon, by us with Claude Code, and the team's two phone apps in frontend/ by our teammate, with GitHub Copilot; see AI_USAGE.md. At runtime the agents run on Kimi models (Moonshot AI; ADR-0067). Pre-event items we reused, all disclosed (planning/DISCLOSURE.md; the written disclosure for ETHGlobal: docs/plan/DISCLOSURE_MESSAGE.md): two testnet wallets (a funding wallet holding faucet tokens, and the wallet that owns the ENS name), two credentials (an Arkiv access key and an Anthropic API key; no code), and the bare ENS name graphpay.eth, registered on Sepolia before the event with no records or subnames. Every other wallet was created at the event (docs/technical/WALLETS.md).

What it does

Vitalik types one sentence on his phone: "Just landed in Mumbai. Get me the best masala dosa near BKC under 6 USDT, delivered within an hour." (the story, ADR-0073; synthetic).

1. His agents ask before they pay. A scout finds shops near him on Arkiv; an analyst asks the money graph for each shop's reputation (orders, refunds, on-time rate) in one GraphQL call and gets the exact Arkiv reads behind the answer. The trap shop is refused, with its reasons.
2. The payer agent pays with one signature and no gas. The shop answers HTTP 402 (x402); the payer signs once; our facilitator checks the agent's ENS name (active, not paused, not killed, under its cap), verifies and settles in test USDT on Whitechain Sepolia. The payee is read from the shop's ENS name at pay time, never hard-coded (ADR-0046).
3. The payment becomes memory. Our mirror writes it to Arkiv as a receipt that cannot be edited, plus running totals ("tallies") for both sides, in one atomic batch. The next agent that asks sees it.
4. The merchant's phone rings with the buyer agent's ENS name and its reputation; the shop dispatches, refunds part of an order, renews a subscription.
5. The human stays in charge. Vitalik can pause his payer (an ENS record), the owner can kill an agent (its ENS name is unregistered), and an agent cannot raise its own cap: the ENS resolver refuses the write.

The model proposes, code disposes (ADR-0019): limits come from the human's words, rankings are recomputed in code, the payer is bound to the approved order, and money and limits are never decided by a prompt.

Try it

what	link
The stage: the deck in the middle, Vitalik's phone and the shop's phone driving it	https://graphpay-event.vercel.app
How it works, in plain words	https://graphpay-event.vercel.app/how
Mumbai map: shops from Arkiv, agents at work (synthetic shops labelled)	https://graphpay-event.vercel.app/map
Race mode: plain Arkiv against Graph Arkiv, counting reads	https://graphpay-event.vercel.app/race
GraphQL over Arkiv (GET or POST), with the explain trace in extensions.arkiv	a shop's tallies
MCP server for any agent (POST; tools schema, ask, graphql, explain)	https://graphpay-event.vercel.app/api/mcp, also published in ENS as graphpay.eth's agent-endpoint[mcp]
Our facilitator's health: relayer, balance, daily gas budget, floor	https://graphpay-event.vercel.app/api/facilitator/health
The payer agent's live state: ENS status, cap, spent today, last order	https://graphpay-event.vercel.app/api/state/customer

Verify each claim

Most links below open a public explorer or a live endpoint, and the rest open this repo's own records; nothing needs a login. Amounts are test USDT (0xcedfB56113143d55b2358b8CFbB0dEB5Ad2f55a7, 6 decimals). The good shop, Filter & Fold, is filter-and-fold.graphpay.eth since the label flip (#189, Sat 7 Nov); the payments before it went to its earlier name, kesar-kingdom.graphpay.eth, which pays into the same wallet. Checked against the explorers on Fri 6 Nov, about 23:10 IST.

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