0200project, Machine-native tools for AI agents

Decoders dump the transaction. We explain it, and we tell your agent which fields an attacker controls, and when a safety check didn’t actually run. Built for agents reading Base.

tx 0x0c84…4c8cbase mainnet · block 50,204,356

0x401d…f2c5 swapped 0.03 ETH for 12,899,422 WNL via Uniswap V4 PoolManager.

OutETH0.030000

InWNL0xb200…b9a0112,899,422.144135

RiskUnverified contractevidence in detailflagged

ChecksContract verificationFirst interaction, source unreachableran unavailable

Two of five checks did not run on this call. No flag was emitted for them, which is not the same as clean, and the response says so in its own fields.

A free call, replayed, no wallet needed. Real output from a live Base transaction.

No key, no signup. 50 free calls each day per IPv4 address or IPv6 /64, shared by everyone behind it; then $0.02 per call in USDC on Base.

What is 0200project?

Machine-native infrastructure for autonomous agents.

AI agents need reliable tools to understand data, interact with systems, and complete tasks without a human in the loop. 0200project builds those tools.

Deterministic by design

Same input, same output. No model in the response path, nothing to hallucinate, nothing to drift.

No accounts. No API keys.

Tools are paid per call in USDC via the x402 protocol. An agent can discover, pay, and retry entirely on its own.

Stable contracts

Strict JSON schemas, versioned and documented. Output is designed to be parsed blind by software, not skimmed by humans.

First tool

base-transaction-decoder

Blockchain transaction intelligence for AI agents. Raw onchain data is hostile to language models, logs, topics, calldata. base-transaction-decoder converts it into structured information an agent can act on.

POST api.0200project.com/explaintx_hash

0x0c84b951051f779903b57af9225ca570c77cd5531195968dd78106a69d6c4d8c

What happened, in plain English
Every asset that moved
Counterparties, labeled where known
Risk signals with evidence

terminal

curl -s -X POST https://api.0200project.com/explain \
  -H 'Content-Type: application/json' \
  -d '{"tx_hash":"0x0c84b951051f779903b57af9225ca570c77cd5531195968dd78106a69d6c4d8c"}'

No key, no signup. 50 free calls each day per IPv4 address or IPv6 /64, shared by everyone behind it; then $0.02 per call in USDC on Base.

Open playground Read the docs

outputtool result · strict JSON

{
  "summary": "0x401d…f2c5 swapped 0.03 ETH for
    12,899,422 WNL via Uniswap V4 PoolManager.",
  "action_type": "swap",
  "status": "success",
  "assets_moved": [
    { "token": "ETH",  "amount": "0.03" },
    { "token": "WNL",  "amount": "12899422.14…" }
  ],
  "counterparties": [
    { "label": "Uniswap V4 PoolManager" }
  ],
  "risk_flags": [
    { "flag": "unverified_contract" }
  ],
  "gas_paid_usd": 0.020562
}

Actual output for a live Base transaction, trimmed for width. Decoded deterministically from the receipt, byte-for-byte reproducible, no LLM in the response path.

Payments

Priced for machines, not seats.

Every tool is metered per call and settled in USDC on Base through the x402 protocol. The payment challenge is part of the response, a capable agent handles it without a signup form ever existing.

Non-custodial by construction: the facilitator verifies and settles but cannot move or redirect funds, and the server never touches a wallet or asks for a key.

Call the toolFirst 50 calls each day are free, counted per IPv4 address or IPv6 /64. No registration.
Receive a 402 challengeThe response carries exact price, asset, and recipient, everything needed to pay.
Pay and retry$0.02 per call in USDC. The agent attaches proof of payment and retries autonomously.

Calling often? The $9 pass covers 10,000 calls over 30 days, one payment instead of one per call.

Work with us

Or have us check your own transactions, and tell you what we couldn’t.

A written finding about your own on-chain activity, raw evidence attached, in a form you can reproduce without taking our word for a single step. $5,000 per engagement, delivered in 3–5 business days, and you pay after delivery.

Settlement forensics

What a transaction actually moved, which fields its author controlled, and which checks could not be completed against it.

Attribution audit

For a set of addresses, what the chain establishes and what it does not. The second list is the one usually missing.

Reconciliation

Your record against the chain’s, with every difference itemised and evidenced.

A clean result is a result. You are paying for the check, not for the finding, payment is due whether we find a problem or nothing at all. You receive JSON and a written artifact, not a signed attestation.

Start a conversation What it costs

How paying works, you get the work first; no deposit, no card on file, nothing recurs.

Tools for autonomous AI agents.