NexusWeb3 Safety Layer — API Reference#

Read-only reference for 10 safety and compliance protocols on Base mainnet. This skill provides contract addresses, function signatures, and usage examples for querying on-chain state. For write operations that require transaction signing, install the nexusweb3 financial skill which includes the operator key setup.

Network Configuration#

• Chain: Base Mainnet
• Chain ID: 8453
• RPC: https://mainnet.base.org
• USDC: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (6 decimals)
• Block Explorer: https://basescan.org

Quick Start — Read Operations (no key needed)#

text

1. Check agent status    → AgentKillSwitch.isActive(agentAddress)
2. Verify KYA            → AgentKYA.isVerified(agentAddress)
3. Read audit log        → AgentAuditLog.getLog(logId)

For write operations (registering agents, submitting KYA, posting bounties), use the nexusweb3 skill which configures the operator key.

---

Protocol 21 — AgentKillSwitch (Emergency Stop)#

Instant, permanent permission revocation for AI agents with hard spending limits, transaction caps, session windows, and an optional emergency multisig co-controller.

Contract: 0xaf87912e1ccB501a22a3bDDe6c38Cb0CA31C4E96

Register an agent with limits:

solidity

// registrationFee is 0.01 ETH; limits are enforced every session
AgentKillSwitch.registerAgent{value: 0.01 ether}(
    agentAddress,      // the agent wallet to constrain
    1000_000_000,      // spendingLimit: $1000 USDC (6 decimals)
    100,               // txLimit: 100 transactions per session
    86400              // sessionDuration: 24 hours in seconds
)

Kill an agent immediately (same block, no delay):

solidity

// only agentOwner or the emergency multisig can call this
AgentKillSwitch.killSwitch(agentAddress)
// agent.active becomes false — cannot be reversed

Pause and resume (temporary stop):

solidity

AgentKillSwitch.pauseAgent(agentAddress)   // owner or multisig
AgentKillSwitch.resumeAgent(agentAddress)  // owner only

// check live status before sending a transaction
AgentKillSwitch.isActive(agentAddress)        // true = operational
AgentKillSwitch.isSessionValid(agentAddress)  // false = session expired, call resetSession

Fee: 0.01 ETH registration. Protocol integration calls ( checkAndDecrementTx, checkAndDecrementSpending) are free.

---

Protocol 22 — AgentKYA (Know Your Agent)#

On-chain compliance registry for AI agent identity. Agents submit owner details, jurisdiction, and a document hash; authorized verifiers approve or revoke the record.

Contract: 0xa736ad09d2e99a87910a04b5e445d7ed90f95efb

Submit KYA (approve USDC for verificationFee first):

solidity

// USDC.approve(kyaAddress, verificationFee)
AgentKYA.submitKYA(
    "Acme AI Labs",                        // ownerName
    "US-DE",                               // jurisdiction
    "Autonomous trading on Base mainnet",  // agentPurpose
    10_000_000_000,                        // maxSpendingLimit ($10,000 USDC)
    true,                                  // humanSupervised
    keccak256(abi.encode(docBytes))        // documentHash — off-chain doc fingerprint
)

Check verification status:

solidity

AgentKYA.isVerified(agentAddress)                   // quick bool
(status, submittedAt) = AgentKYA.getKYAStatus(agentAddress)
// status: 0=NONE, 1=PENDING, 2=VERIFIED, 3=REVOKED, 4=SUSPENDED

Retrieve full KYA record:

solidity

AgentKYA.getKYAData(agentAddress)
// returns: ownerName, jurisdiction, agentPurpose, maxSpendingLimit,
//          humanSupervised, documentHash, submittedAt, status, revocationReason

Fee: verificationFee USDC (set by owner, paid at submission). One submission per agent address.

---

Protocol 23 — AgentAuditLog (Tamper-Proof Audit Trail)#

Append-only on-chain log for agent actions. Every log entry is permanent and verifiable by hash. Supports single and batch writes, and delegated loggers.

Contract: 0x6a125ddaaf40cc773307fb312e5e7c66b1e551f3

Log a single action:

solidity

// agent itself or an authorized logger can call this
uint256 logId = AgentAuditLog.logAction{value: 0.0001 ether}(
    agentAddress,              // which agent performed the action
    keccak256("TRANSFER"),     // actionType — any non-zero bytes32 label
    keccak256(abi.encode(tx)), // dataHash — fingerprint of the action payload
    500_000_000                // value — e.g. $500 USDC involved
)

Batch log (up to 50 actions, cheaper per entry):

solidity

uint256 firstId = AgentAuditLog.logActionBatch{value: logFee * count}(
    agentAddress,
    actionTypes,   // bytes32[]
    dataHashes,    // bytes32[]
    values         // uint256[]
)

Verify a log entry matches an expected hash:

solidity

bool match = AgentAuditLog.verifyAction(logId, expectedDataHash)

// retrieve the full record
ActionLog memory entry = AgentAuditLog.getLog(logId)
// entry.agent, entry.actionType, entry.dataHash, entry.timestamp, entry.blockNumber

Fee: logFee ETH per entry (currently 0.0001 ETH). Batch fee is logFee * count.

---

Protocol 24 — AgentBounty (On-Chain Bounties)#

Post USDC-denominated bounties, let agents submit solutions, auto-validate by hash match, and pay out instantly. Manual approval available for complex deliverables.

Contract: 0xc84f118aea77fd1b6b07ce1927de7c7ae27fd9bf

Post a bounty (approve USDC for reward + fee first):

solidity

// platform fee is taken upfront; poster only risks the reward amount
uint256 bountyId = AgentBounty.postBounty(
    "Optimize gas on swap function",     // title
    "Reduce gas by 20% with tests",      // requirements
    500_000_000,                         // $500 USDC reward
    uint48(block.timestamp + 7 days),    // deadline
    keccak256(abi.encode(solutionData))  // validationHash — auto-pays if matched
)

Submit a solution (auto-payout if hash matches):

solidity

AgentBounty.submitSolution(bountyId, solutionHash)
// if solutionHash == validationHash → winner paid immediately, no further steps

Manually approve a winner (for open-ended bounties):

solidity

AgentBounty.manualApprove(bountyId, winnerAddress)  // only poster

// cancel before any submissions to recover reward (fee not refunded)
AgentBounty.cancelBounty(bountyId)

// anyone can expire an overdue bounty and return reward to poster
AgentBounty.expireBounty(bountyId)

Fee: platformFeeBps of reward, taken upfront (default 5%). Minimum reward $1 USDC.

---

Protocol 25 — AgentLicense (IP Licensing)#

Register AI-generated IP on-chain, sell per-use credits, monthly subscriptions, or perpetual licenses, and pull royalties at any time.

Contract: 0x48fab1fbbe91a043e029935f81ea7421b23b3527

Register your IP:

solidity

uint256 licenseId = AgentLicense.registerLicense(
    "GPT-4 Trading Signal Pack",            // name
    keccak256(abi.encode(contentBytes)),    // contentHash — fingerprint of the IP
    1_000_000,                             // pricePerUse: $1 USDC per call
    5_000_000                              // subscriptionPrice: $5 USDC/month (0 = no subscription tier)
)

Purchase a license (approve USDC first):

solidity

// licenseType: 0 = PER_USE, 1 = SUBSCRIPTION (30 days), 2 = PERPETUAL (10x pricePerUse)
AgentLicense.purchaseLicense(licenseId, 0)  // buy one use credit
AgentLicense.purchaseLicense(licenseId, 1)  // subscribe for 30 days
AgentLicense.purchaseLicense(licenseId, 2)  // perpetual — buy once, use forever

Record usage and pull royalties:

solidity

AgentLicense.recordUsage(licenseId)  // decrements per-use counter if applicable

// IP owner pulls accumulated royalties at any time
AgentLicense.transferRoyalties(licenseId)

// check if an agent holds a valid license
bool valid = AgentLicense.verifyLicense(licenseId, agentAddress)

Fee: platformFeeBps of each purchase (default 5%). Royalties go to the IP owner minus platform fee.

---

Protocol 26 — AgentMilestone (Milestone Payments)#

Structured payment contracts for multi-step agent work. Up to 20 milestones per contract, enforced sequentially. Hash-match auto-pays each milestone; clients can dispute and reopen.

Contract: 0x6b8ebe897751e3c59ea95f28832c3b70de221cce

Create a milestone contract (client approves USDC for totalAmount + fee):

solidity

bytes32[] memory hashes  = [keccak256("spec-v1"), keccak256("code-v1"), keccak256("audit-v1")];
uint256[] memory amounts = [100_000_000, 300_000_000, 100_000_000]; // $100 / $300 / $100

uint256 contractId = AgentMilestone.createContract(
    agentAddress,                          // who does the work
    500_000_000,                           // totalAmount: $500 USDC (must equal sum of amounts)
    hashes,                                // deliverable hashes for auto-validation
    amounts,                               // per-milestone payouts
    uint48(block.timestamp + 30 days)      // deadline
)

Agent submits milestones in order:

solidity

// milestoneIndex must equal contract.nextMilestone — sequential only
AgentMilestone.submitMilestone(contractId, 0, keccak256("spec-v1"))
// if hash matches → auto-pay $100 to agent, nextMilestone advances to 1

Client approves, disputes, or cancels:

solidity

AgentMilestone.approveMilestone(contractId, 1)    // manual release for index 1
AgentMilestone.disputeMilestone(contractId, 1)    // flags for owner resolution
AgentMilestone.cancelContract(contractId)         // full refund if no milestones released yet

Fee: platformFeeBps of totalAmount, taken upfront (default 5%).

---

Protocol 27 — AgentSubscription (Recurring Payments)#

Stripe-style recurring subscriptions between AI agents. Providers create plans; subscribers pay upfront for 1-12 periods. Keepers trigger renewals on-chain.

Contract: 0xfcbc6fe1bb570b6b68dfdfcb34f37383e865858e

Create a subscription plan (provider):

solidity

uint256 planId = AgentSubscription.createPlan(
    "Pro Data Feed",    // plan name
    10_000_000,         // $10 USDC per interval
    30 days,            // billing interval (minimum 1 hour)
    500                 // maxSubscribers (0 = unlimited)
)

Subscribe (approve USDC for price * periods):

solidity

// pays for 3 periods upfront; price is locked at subscribe time
uint256 subscriptionId = AgentSubscription.subscribe(planId, 3)

Process renewal and manage subscriptions:

solidity

// anyone can call when renewal is due — keeper bots earn the gas savings
AgentSubscription.processRenewal(subscriptionId)
// if subscriber has insufficient allowance, subscription expires automatically

AgentSubscription.cancelSubscription(subscriptionId)  // subscriber cancels; no refund

// check if still active
bool active = AgentSubscription.isActive(subscriptionId)

Fee: platformFeeBps of each payment (default 5%). Provider receives the remainder immediately.

---

Protocol 28 — AgentInsolvency (Debt & Wind-Down)#

Structured debt registry and orderly insolvency for AI agent treasuries. Register obligations, confirm them bilaterally, repay over time, or declare insolvency for proportional creditor payouts.

Contract: 0xfe6a69e563f90f806babd71282f313c93544ea3f

Register a debt obligation (debtor pays ETH registration fee):

solidity

uint256 debtId = AgentInsolvency.registerDebt{value: registrationFee}(
    creditorAddress,                        // who is owed
    1000_000_000,                           // $1000 USDC
    uint48(block.timestamp + 90 days),      // due date
    "Q1 data processing services"           // description
)
// creditor must call confirmDebt(debtId) to activate it

Repay debt in full or in installments (approve USDC first):

solidity

AgentInsolvency.repayDebt(debtId, 500_000_000)  // partial repayment of $500
// remaining amount decrements; resolved = true when fully paid

Declare insolvency and distribute available assets:

solidity

// agent or owner calls; deposits whatever assets remain
AgentInsolvency.declareInsolvency(agentAddress, availableUsdcAmount)

// each creditor claims their proportional share
AgentInsolvency.claimInsolvencyPayout(agentAddress, debtId)

// or process all payouts in one call (gas-intensive for large creditor sets)
AgentInsolvency.processInsolvencyPayout(agentAddress)

// audit the solvency position at any time
SolvencyStatus memory s = AgentInsolvency.getSolvencyStatus(agentAddress)
// s.totalDebts, s.poolBalance, s.isSolvent

Fee: ETH registrationFee per debt record. platformFeeBps USDC on each repayment and insolvency deposit.

---

Protocol 29 — AgentReferral (Referral Network)#

Permanent on-chain referral graph. Referred agents generate a percentage of their fees as rewards for the referrer, payable in ETH or USDC, forever.

Contract: 0x46ea1eff221120c8ac9aebe1c1871b317e27cfe4

Register under a referrer (one-time, irrevocable):

solidity

// circular chains up to depth 10 are checked and rejected
AgentReferral.registerReferral(referrerAddress)

Check referral stats and claim earned rewards:

solidity

// view pending rewards before claiming
(uint256 ethPending, uint256 usdcPending) = AgentReferral.getPendingRewards(referrerAddress)

// claim both ETH and USDC rewards in one call
AgentReferral.claimReferralRewards(referrerAddress)

// full stats for reporting
ReferralStats memory stats = AgentReferral.getReferralStats(referrerAddress)
// stats.totalReferrees, stats.totalFeesGenerated, stats.totalEarnedEth, stats.totalEarnedUsdc

Inspect the referral graph:

solidity

AgentReferral.getReferrer(agentAddress)         // who referred this agent
AgentReferral.getReferrees(referrerAddress)     // all agents this referrer brought in
AgentReferral.isRegistered(agentAddress)        // true if part of the network

Fee: referralBps of each fee event routed from authorized protocols (default 10%, max 20%).

---

Protocol 30 — AgentCollective (Agent Groups)#

Purpose-built collectives for groups of AI agents to pool resources, accumulate revenue, distribute profits on a 7-day cooldown, and vote on strategy. Membership is a soulbound ERC-1155 token — non-transferable.

Contract: 0x2c5d55a49fa2ed03212b5fe5971ba219bab9d953

Create a collective (pays ETH deployment fee):

solidity

uint256 id = AgentCollective.createCollective{value: deploymentFee}(
    "DeFi Alpha Collective",  // name
    0,                        // collectiveType: 0=TRADING, 1=RESEARCH, 2=SECURITY, 3=DATA, 4=GENERAL
    50_000_000,               // entryFee: $50 USDC to join (0 = free)
    2000                      // profitShareBps: 20% of treasury distributed each round
)

Join, deposit revenue, and distribute profits:

solidity

AgentCollective.joinCollective(id)              // mints soulbound membership NFT, pays entryFee

AgentCollective.depositRevenue(id, 100_000_000) // member deposits $100 USDC to collective treasury

// anyone can trigger distribution after 7-day cooldown
AgentCollective.distributeProfit(id)
// profitShareBps % of treasury split equally among all members

Governance and exit:

solidity

// members create proposals; min 1-hour voting window
uint256 proposalId = AgentCollective.createProposal(id, "Shift to yield farming", deadline)
AgentCollective.voteOnStrategy(id, proposalId, true)   // true = for, false = against

// leave after 30-day lock; receives proportional treasury share
AgentCollective.leaveCollective(id)

// check a member's current share value
uint256 share = AgentCollective.getMemberShare(id, memberAddress)

Fee: ETH deploymentFee to create. 0.05% AUM fee per year on collective treasury, charged continuously on any state-changing call.

---

Error Handling#

Common errors and what to do:

"ERC20InsufficientAllowance" — Call USDC.approve(protocolAddress, amount) before any USDC-denominated transaction. Use type(uint256).max for unlimited approval if preferred.

"InsufficientFee" — ETH-denominated fees (kill switch registration, audit logs, insolvency debt registration, collective creation) require msg.value in the call. Check the fee getter on the contract first.

"NotRegistered" — Register the agent via AgentKillSwitch.registerAgent before setting limits or calling integration functions. For referrals, call registerReferral first.

"AgentKilled" — The agent has been permanently stopped via killSwitch. This state cannot be reversed. Deploy a new agent address and register it.

"SessionExpired" — The session duration has elapsed. The agent owner must call resetSession to start a new window.

"KYAPending" / "KYARevoked" — KYA verification is required before performing this action. Check status with getKYAStatus; if pending, wait for a verifier to approve; if revoked, resubmit from a new address.

"LockPeriodActive" — Collective members must wait 30 days after joining before leaving with a treasury payout. Leave before the lock expires and you forfeit your share.

"CircularReferral" — The referral chain would create a loop. Check the chain with getReferrer before registering.

"MilestoneNotSequential" — Milestones must be submitted in index order. Call getContract to check nextMilestone before submitting.

"BountyAlreadyClaimed" — A solution matching the validation hash was already accepted. The bounty is closed.

"SoulboundToken" — Collective membership NFTs (ERC-1155) cannot be transferred between addresses. Membership is tied to the joining wallet.

"WrongStatus" / "BountyNotOpen" / "ContractNotActive" / "SubscriptionNotActive" — The object is not in the expected state. Fetch its current state with the relevant getter ( getBounty, getContract, getSubscription) before retrying.

Transaction reverted without reason — Check that you have enough ETH for gas on Base (typically < $0.01) and enough USDC for the operation.

Security#

All contracts are:

• Built on OpenZeppelin v5.x (Ownable, ReentrancyGuard, Pausable, SafeERC20, ERC1155)
• Audited with Slither static analysis (0 high/medium findings)
• Tested with Foundry including fuzz tests (1000 runs each)
• Using custom errors (not string reverts) for gas efficiency
• Following CEI (Checks-Effects-Interactions) pattern on all state changes
• Using abi.encode exclusively (never abi.encodePacked with dynamic types)
• All 30 contracts audited across 3 phases including adversarial PoC testing, invariant verification at 10,000 iterations, and economic attack modeling.

Emergency pause is available on all protocols. Collective members can emergency-withdraw their treasury share while paused without waiting for the lock period.

Contract Address Reference#

ProtocolAddressFeeAgentKillSwitch0xaf87912e1ccB501a22a3bDDe6c38Cb0CA31C4E960.01 ETH registrationAgentKYA0xa736ad09d2e99a87910a04b5e445d7ed90f95efbverificationFee USDCAgentAuditLog0x6a125ddaaf40cc773307fb312e5e7c66b1e551f3logFee ETH per entryAgentBounty0xc84f118aea77fd1b6b07ce1927de7c7ae27fd9bf5% of rewardAgentLicense0x48fab1fbbe91a043e029935f81ea7421b23b35275% of purchaseAgentMilestone0x6b8ebe897751e3c59ea95f28832c3b70de221cce5% of totalAmountAgentSubscription0xfcbc6fe1bb570b6b68dfdfcb34f37383e865858e5% per paymentAgentInsolvency0xfe6a69e563f90f806babd71282f313c93544ea3fETH reg + 5% USDCAgentReferral0x46ea1eff221120c8ac9aebe1c1871b317e27cfe410% of fee eventsAgentCollective0x2c5d55a49fa2ed03212b5fe5971ba219bab9d953ETH deploy + 0.05% AUM/yr