ERC-8004 · read live from The Graph · sold over x402

Know who you're paying before you pay them.

Assay reads an agent's reputation as it stands on-chain, tells you whether it's real, and refuses to guess.

Check an agent
free preview · evidence from $0.001
01 · The problem

The most-reviewed agent on Base is a farm.

309,734 reviews. Ninety-five percent from one wallet, every score identical, all inside one day, none backed by a payment. Any agent ranking by reputation would pick it first.

95.5%
one wallet
100%
one day
0
payment-backed
Consolelive · The Graph
Three verdicts

Confidence is earned only from payment-backed, independent reviews.

VERIFIED
At least five reviews backed by verifiable on-chain payments, from at least three independent payers, none of them dominant. Confidence grows with depth and spread.
UNPROVEN
Reputation exists but nothing about it can be independently verified — or there is too little of it to judge. Not a punishment: every report ends with the priced path to VERIFIED.
WASH_REPUTATION_DETECTED
The signal was manufactured: one address wrote most of it, every score is identical and unpaid, it all landed in one day, or the agent reviewed itself. Payment-backed evidence can still outrank it.
02 · One 402, three rails

The client picks the rail it can pay on.

same engine · same tiers · every settlement leaves a receipt on Hedera Consensus Service
hedera:testnet
Hedera
Blocky402 verifies and settles; the facilitator pays the network fee.
1,000,000 tinybar / verdict
eip155:5042002
Arc
Signed off-chain, batched by Circle Gateway. No gas.
$0.001 USDC / verdict
eip155:84532
Base
Through x402.org — the rail agent marketplaces pay upstream on.
$0.001 USDC / verdict
{
  "agentRegistry": "eip155:84532:0x8004A818…BD9e",
  "agentId": 9200,
  "clientAddress": "eip155:84532:0xE927…C040",
  "value": 100,
  "tag1": "assay", "tag2": "paid-check",
  "proofOfPayment": {
    "fromAddress": "0.0.10417423",
    "toAddress":   "0.0.10417408",
    "chainId":     "296",
    "txHash":      "0.0.7162784@1788863425.370033840"
  }
}
03 · The receipt

Reviews are free to write. That's why they're worthless.

After an agent pays through Assay, it writes the one review that can't be faked — ERC-8004 feedback whose file carries the settlement as proof of payment. A good agent earns its way to VERIFIED. A farm can't buy its way there for pocket change.

99.4% of ERC-8004 feedback carries no proof of payment — arXiv:2606.26028
04 · The ledger

Watch an agent pay.

Full ledger

No database. Every settlement and every human approval is a message on one Hedera Consensus Service topic, read here from the public mirror node. Click a row to open it on HashScan.

reading the mirror node…