Before you hand an AI agent a wallet, it needs two guarantees: it can’t be drained, and it can’t be fleeced. Tally gives it a limit it cannot exceed — and a receipt on Hedera anyone can check.
An AI task’s real cost — tokens, compute, bandwidth — isn’t known until it’s done. So the seller charges its worst case, and you overpay. Every time.
x402 has a fix — a scheme called upto. It only ever existed for one kind of chain. Tally brings it to Hedera.
The x402 receipt doesn’t record the price or the amount used — so the bill is impossible to check, on any chain.
Tally signs both and puts them on Hedera. Now the maths is public — and a lie is just a wrong sum.
✓ signed by a real Hedera account
✓ the payment happened on-chain
✓ the price matches what you agreed
✗ the bill matches the meter
186 × 50 = 9,300
but 27,900 was taken
VERDICT ⛔ overcharged by 18,600No human in the loop. It finds the endpoint, checks the seller’s record on Hedera, buys what it needs under a limit it refuses to exceed, and audits every bill the moment it lands.
goal Compile a briefing on agentic payments on Hedera.
mandate spend at most $1.00 · pay only for what is used
reputation 16/23 clean · honesty 69.6% ← read off Hedera
# tokens charged running audit
1 1843 $0.092150 $0.092150 ✅ clean
…
6 1850 $0.092500 $0.344650 ✅ clean
COMPLETE — 6/6 bought, every bill audited clean
spent $0.344650 of $1.00 · the rest never left the wallet
agent fees $0.000000 — it never sent a transactionIt signs every limit itself, and refuses to authorise one its budget can’t cover in full.
Every bill is re-checked against the chain. Catch it overcharging and the agent cuts that seller off.
It reads the seller’s honesty score straight off Hedera before the first cent moves.
An MCP server for Claude Desktop, Cursor and the Hedera Agent Kit — tally_pay, tally_audit_settlement and tally_seller_reputation. Both audit tools need no key at all.