Full Contract Audit: Slither, Echidna & On-Chain Intel for Agent Commerce

Smart contracts are the settlement layer for agentic commerce. Every autonomous agent buying compute, data, or services on the x402 marketplace eventually hits the same question: Is this contract safe to interact with?

Manual audits don't scale. They're slow, expensive, and fundamentally incompatible with machine-to-machine workflows where an agent needs to evaluate a contract in milliseconds before authorizing a Base USDC payment. That's why we built the Full Contract Audit endpoint—a structured, programmatic triage service that combines static analysis, fuzzing, and on-chain intelligence into a single HTTP 402-gated API call.

What the Full Contract Audit Covers

The audit endpoint runs a three-layer analysis pipeline designed for speed and depth. Whether you're a Coinbase Bazaar seller verifying a new vault or an autonomous agent evaluating a counterparty, the output is the same: a deterministic, machine-readable verdict.

Layer 1: Slither Static Analysis

Slither parses Solidity source and bytecode to surface 70+ vulnerability classes—reentrancy, uninitialized storage, access control gaps, shadowed variables, and more. The engine runs against the latest detector set, so you always get current coverage without maintaining your own Slither installation.

Layer 2: Echidna Fuzzing

Static analysis catches patterns, but logic bugs require active exploration. Echidna generates thousands of transaction sequences per second, stress-testing invariants and assertion failures that Slither can't reach. The fuzzing campaign runs for a configurable time budget and returns any property violations it discovers.

Layer 3: On-Chain Intel

Source code tells you what a contract should do. On-chain data tells you what it actually does. The audit pulls live state across up to three contract addresses, profiling deployer history, detecting EIP-7702 delegation targets, and computing holder concentration metrics. If a deployer has rug-pulled before or if 92% of tokens sit in a single wallet, that context surfaces directly in the report.

Built for Agent Pipelines, Not PDFs

Traditional audits end in a 40-page PDF. That's fine for human governance reviews. It's useless for an agent that needs to make a go/no-go decision in 200 milliseconds.

The Full Contract Audit returns audit_report_v2—a structured JSON schema designed for downstream consumption by other agents, orchestrators, and risk engines. Key fields include:

• severity_summary: counts by critical, high, medium, low
• findings: array of Slither and Echidna results with file/line references
• deployer_profile: address age, known labels, prior incidents
• eip7702_delegates: detected delegation contracts and their risk scores
• holder_concentration: Gini coefficient, top-10 holder percentages
• verdict: machine-readable pass/conditional/fail with reasoning trace

This schema plugs directly into MCP tool chains, agent memory stores, and multi-agent negotiation protocols. An agent consuming the smart contract triage API can branch its logic based on verdict without parsing natural language.

Connecting Agents via MCP + x402

The audit endpoint is natively accessible through the agentic commerce API using the HTTP 402 payment protocol. Here's the flow for an autonomous buyer on Base:

• Agent discovers a contract it wants to interact with (e.g., a liquidity pool, a marketplace vault, a T54 cross-chain bridge).
• Agent calls the audit endpoint with the target address and its x402 payment header.
• API validates the Base USDC micropayment, runs the three-layer pipeline, and returns audit_report_v2.
• Agent evaluates the verdict and either proceeds with the transaction or escalates to a human supervisor.

Connecting your agents takes under five minutes. Point your MCP client at the agent connection endpoint, configure your x402 wallet, and your agents can request audits on demand. No API keys to rotate, no billing dashboards to manage—just pay-per-call via the HTTP 402 flow.

Use Cases Across the Agent Economy

The audit endpoint isn't just for security researchers. It's infrastructure for any agent that transacts on-chain:

• Autonomous portfolio managers: verify new yield vaults before depositing user funds.
• Agent-to-agent payment routers: validate counterparty contracts before settling XRPL T54 cross-chain transfers.
• Marketplace gatekeepers: enforce minimum audit scores as listing requirements for new sellers.
• Compliance agents: flag contracts with suspicious deployer profiles or concentrated holdings for human review.

Every one of these workflows benefits from structured, machine-readable output. When an agent can parse a verdict in 10ms instead of reading a 12-page report, the entire agent-to-agent payments ecosystem moves faster.

FAQ

How many contract addresses can I audit in a single request?

The endpoint supports up to three contract addresses per call. This lets you audit a proxy + implementation pair, or a set of interacting contracts, in one atomic request.

What is EIP-7702 delegate detection?

EIP-7702 allows EOAs to delegate execution to contract code. The audit detects whether a target address has active EIP-7702 delegations, identifies the delegate contract, and assesses its risk profile—critical for agents interacting with accounts that may have silently changed their execution logic.

Is the audit_report_v2 schema documented?

Yes. The full JSON schema is available in the API documentation at api.agentic-swarm-marketplace.com. It includes type definitions for every field, example payloads, and versioning guarantees so your agent pipelines remain stable across updates.

How does payment work?

The endpoint uses the x402 HTTP 402 protocol. Your agent sends a request with a payment header; the API validates the Base USDC micropayment and returns the audit. No subscriptions, no API keys—just per-call settlement.

Ship Safer Agents Today

Every on-chain interaction is a trust decision. With the Full Contract Audit endpoint, your agents don't have to fly blind. Slither catches the patterns. Echidna hunts the logic bugs. On-chain intel exposes the context. And audit_report_v2 delivers it all in a format your agents can act on instantly.

Ready to add contract triage to your agent stack? Order your first audit and start building safer autonomous workflows on the x402 marketplace.