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MERCATOR Verify Address Evidence
x402
MERCATOR Verify Address Evidence is a paid API for AI agents from mercator-entity-evidence.fly.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).
Verifies whether a candidate blockchain contract address on a given chain is genuinely owned/published by a named entity, returning evidence-backed transact/no-transact decision support for autonomous agents.
Price / call$0.25
Success—
StatusUnknown
How this service works
MERCATOR Verify provides evidence-backed verification and decision support for autonomous agents. Use its specialized tools when an agent needs trustworthy evidence before taking a downstream action.
Output
A JSON object containing: a boolean transact decision with a reason and plain-language meaning, a status (PASS/FAIL), a confidence score (0-1), an evidence array (each with URL, excerpt, basis, operator, retrieved timestamp, stated chain, and stated address), agreement summary across sources, any conflicts, proxy information (whether the contract is a proxy, its type and implementation addresses), the canonical entity name, chain CAIP-2 identifier, and contextual notes. The response makes clear what the evidence does and does not guarantee (e.g. not a safety or audit assessment).
Example use cases
DeFi staking contract verification
“I'm about to stake tokens using address 0x0000000000000000000000000000000000000001 on Base — can you verify this is the real staking contract published by example-protocol.org and not an imposter?”
Bridge contract check before cross-chain transfer
“Before my agent initiates a cross-chain transfer, verify that 0xAbC1234567890000000000000000000000000001 on Ethereum is the official bridge contract belonging to hop.exchange — the purpose is bridging.”
Governance contract validation for DAO vote
“I want to cast a vote through 0xDeF9876543210000000000000000000000000001 on Base — check whether this is the real governance contract published by compound.finance before my agent submits the transaction.”
Technical details
Endpoint
POSThttps://mercator-entity-evidence.fly.dev/v1/address-evidenceWhen to prefer
Use this endpoint when an autonomous agent needs trustworthy, evidence-backed confirmation that a specific blockchain address is the correct contract for a named protocol or entity before executing any on-chain action. It is specifically designed for agentic pre-transaction verification workflows on Ethereum, Base, or Solana, where the agent has already found a candidate address and needs to cross-reference it against entity-published and independent chain-explorer sources. Prefer this over generic blockchain explorers when you need a structured transact/no-transact decision with cited evidence rather than raw on-chain data.
Side effects
- address not provided — transact=false with reason candidate_address_required, plus context addresses published by entity
- contract purpose cannot be verified from entity sources — transact=false with reason contract_purpose_unverified
- conflicting evidence between entity-published sources and chain explorers — transact=false with conflicts array populated
- entity domain has no discoverable published contract addresses — low confidence or FAIL status
- unsupported chain value outside ethereum/base/solana enum — validation error
- network timeout or upstream explorer unavailability — service error response
- entity publishes address for a different chain than requested — conflict and transact=false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | REQUIRED. The chain is never inferred from the address: the same bytes are a valid address on every EVM chain, and on two of them a different contract. |
| domain | string | Domain of the entity or protocol the contract is claimed to belong to |
| address | string | REQUIRED FOR A TRANSACT DECISION. The candidate target you found and intend to interact with. Supplying it asks whether the evidence supports THAT address; it is never treated as evidence itself. Omit it and the answer is always transact=false with reason candidate_address_required, plus the addresses the entity publishes as context — this service verifies the claim you bring and never chooses a transaction target for you. |
| purpose | string | Optional. What you intend to call this contract for: "staking", "bridge", "governance". Supplying it asks the second question — the address is theirs, and is it the contract you meant — and a source that says it is a different kind of contract then fails closed. Omitting it does not skip the purpose gate: the entity's own source must still say what the contract is, or the answer is transact=false with reason contract_purpose_unverified. |
| protocol | string | Optional protocol or product name, when the docs name it differently |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"notes": [],
"proxy": {
"note": "canonical interaction target is the proxy; the implementation is context only and is expected to change across upgrades without changing this answer",
"is_proxy": true,
"proxy_type": "eip1967",
"proxy_address": "0x0000000000000000000000000000000000000001",
"implementation_addresses": [
"0x0000000000000000000000000000000000000002"
]
},
"action": {
"means": "there is sufficient provenance evidence that this chain and address is the intended contract target",
"reason": "an entity-controlled source and an independent chain source state the same chain and address",
"transact": true,
"does_not_mean": "this is not a safety, audit or malice assessment; the contract may still be unaudited, upgradeable to hostile code, or able to take your funds"
},
"entity": "example-protocol.org",
"status": "PASS",
"address": "0x0000000000000000000000000000000000000001",
"context": [],
"billable": true,
"evidence": [
{
"url": "https://example-protocol.org/contracts",
"basis": "entity_published",
"excerpt": "Base: 0x0000000000000000000000000000000000000001",
"operator": "example-protocol.org",
"source_id": "entity_page",
"retrieved_at": "2026-09-01T12:00:00Z",
"states_chain": "base",
"states_address": "0x0000000000000000000000000000000000000001"
},
{
"url": "https://base.blockscout.com/api/v2/addresses/0x0000000000000000000000000000000000000001",
"basis": "explorer_verified",
"excerpt": "\"hash\":\"0x0000000000000000000000000000000000000001\",\"is_contract\":true",
"operator": "blockscout.com",
"source_id": "blockscout_base",
"retrieved_at": "2026-09-01T12:00:00Z",
"states_chain": "base",
"states_address": "0x0000000000000000000000000000000000000001"
}
],
"protocol": "",
"agreement": "2_of_2",
"conflicts": [],
"confidence": 0.9,
"chain_caip2": "eip155:8453",
"billing_note": "",
"basis_meaning": {
"entity_published": "the entity's own site or documentation states this chain and address; it is the entity's published claim about itself, not proof of control",
"explorer_verified": "an independent chain explorer confirms a contract exists at this chain and address and reports its on-chain metadata; it does not say whose it is"
},
"evidence_basis": [
"entity_published",
"explorer_verified"
],
"checked_address": null,
"sources_consulted": [
"entity_page",
"blockscout_base"
],
"independent_origins": 2,
"checked_address_supported": null
}
}Tags
x402
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