DLL Execution

io.github.dllioPublished by GitHub account dlliov0.1.0Updated Oct 24, 2026

Free read-only Base Mainnet transaction Preflight and Verification; no signing or custody.

The publisher's own server: Execution Market

VerifiedStreamable HTTPWeb executableFinanceSecurity & Monitoring

Overview

AI-generated overview

A free, read-only remote MCP server that lets an assistant simulate an unsigned Base Mainnet transaction before signing and verify an already-broadcast one.

What you can do
Simulate one unsigned Base Mainnet transaction candidate before signing, returning call success or revert, destination, L2 fee constraints, a judgment and reason codes with evidence (preflight_transaction). Check an already-broadcast Base Mainnet transaction hash against explicit inclusion, receipt-status and optional candidate-field expectations, returning a verification state (verify_transaction).
When to use it
Use it when an assistant is preparing an onchain action on Base Mainnet and wants a read-only sanity check before a user signs, or when it needs to confirm that a broadcast transaction was included and met stated expectations. It is not needed for signing, sending or custody.
Requirements
A remote streamable HTTP endpoint; no API key, wallet, payment or environment variables are declared. Network access to the endpoint is required. Base Mainnet only.
Before you install
Read-only: it does not sign, broadcast, hold custody or prove ownership of the from address. A PASS judgment is not permission to execute, and INDETERMINATE is not success or proven failure. The L2 fee estimate is not total cost; an unavailable fee is unknown, not zero. Keep private keys and credentials out of requests. The README also describes a separate paid Benchmark endpoint using wallet identity and USDC payment, which is not among the listed tools.

Installation

In SourceWeft

  1. Open DLL Execution in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.dllio%2Fdll-execution/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "dll-execution": {
      "type": "http",
      "url": "https://execution.dll.io/mcp"
    }
  }
}

README

DLL Execution — Base transaction simulation and verification for AI agents

Execution infrastructure for AI agents.

DLL is an independent, read-only Base Mainnet API and remote MCP service. Before signing, simulate an unsigned transaction, inspect call success or revert, and check explicit destination and L2 execution fee constraints. After independent broadcast, verify inclusion, requested receipt status and supported transaction-field expectations. Results include structured Judgment or Verification states, reason codes, evidence and explicit uncertainty; DLL never signs, broadcasts or takes custody.

Who it is for

AI Agents with an unsigned transaction candidate or an already-broadcast transaction hash, and developers integrating those Agents. Before acting, an Agent needs to understand likely failure, known costs, explicit constraints and remaining uncertainty. Afterward, it needs to check observed outcomes against explicit expectations.

Available now: Execution Preflight

POST https://execution.dll.io/v2/execution/preflight

V0.2.1 evaluates one unsigned Base Mainnet transaction candidate and returns read-only simulation, an estimated L2 execution fee, deterministic policy checks, structured judgment and supporting evidence. It is a limited free public trial; no wallet connection, signature or payment is needed for Preflight. Benchmark's separate payment/free-trial rules do not apply to this endpoint.

With complete supported EIP-1559 transaction context, optional fee_estimation returns a separate conditional estimate of L1 data, L2 execution, applicable Operator Fee and Total Network Fee. Missing necessary components keep total unavailable, not zero. The estimate is not realized cost, a future spending guarantee or an automatic PASS.

text
Agent has an unsigned transaction candidate→ calls DLL Execution Preflight→ receives simulation / cost / policy / judgment / evidence→ Agent decides what to do next
JudgmentMeaning within the evaluated evidence
PASSSimulation and applicable checks passed, with no material unresolved issue identified. Not permission to execute.
CAUTIONExecution may be technically possible, but important uncertainty or incomplete evidence remains.
BLOCKDeterministic evidence, such as a simulation revert or explicit constraint rejection, indicates not to proceed with this candidate.
INDETERMINATEAvailable evidence cannot support a reliable judgment. Do not treat it as success or a proven transaction failure.

Ordinary successful Preflight currently returns CAUTION because legacy cost_estimate L1/total remain unavailable. A complete optional network_fee_estimate does not recompute legacy Judgment or the L2-only cost constraint. None of these states evaluates profitability, investment quality, strategic desirability or financial advice.

Available now: Execution Verification

POST https://execution.dll.io/v2/execution/verify

Verification V0.1 observes an already-broadcast Base Mainnet transaction and evaluates narrow expectations about its chain, inclusion, receipt status and optional candidate content. It is free and read-only: no signature, wallet connection or payment is required, and DLL need not have performed the original Preflight.

  • Preflight — before execution: evaluate what is likely to happen, within the recorded evidence.
  • Verification — after execution: observe what actually happened and evaluate it against explicit expectations.

Only transaction_hash is required. The default checks Base inclusion; request receipt_status: "success" explicitly to check receipt success. Read verification.state, not just HTTP status: VERIFIED means the requested checks are satisfied, CONTRADICTED means at least one check is contradicted, and INDETERMINATE means evidence is insufficient. These states do not establish finality, authorization, ownership, causality or profitability.

Available now: Execution-cost Benchmark

POST https://execution.dll.io/v1/benchmark/transactions

Benchmark compares observed Base Mainnet transaction costs with historical context. The public path uses SIWX wallet identity and x402 v2 upto USDC: the first three valid analyses per verified wallet are free, then $0.005 per delivered valid analysis. Anonymous nonempty payment quotes do not force free-eligible wallets to pay. A paid N-hash batch quotes a maximum of N × 5000 atomic USDC; actual settlement counts only valid paid items. HTTP 200 can contain unavailable items; inspect completed billing. Historical percentiles are not route recommendations, profitability judgments or future fee guarantees. See the Benchmark guide and bounded SDK client reference.

Start here

Start with HTTP or Remote MCP Quickstart: no DLL account, API key, wallet or private repository access. The JavaScript path uses only Node.js built-ins; the remote MCP path uses your existing MCP client. No npm install or AgentKit SDK is required.

Public discovery and canonical contract

  • API origin: compact capability selector and canonical integration links.
  • Machine-readable index: index of authoritative public surfaces, not a duplicate API contract.
  • Public sitemap and crawl hints: explicitly advertised public GET documents; not authentication or proof of indexing.
  • Live OpenAPI: canonical API schemas and available operations.
  • Capabilities: currently available capabilities and their scope.
  • x402 discovery manifest: Benchmark paid resource discovery; neither Preflight nor Verification requires x402 payment.

This repository explains what DLL does and how to use it. Live OpenAPI, well-known metadata and actual API responses are the canonical public contract. It is not an implementation/source-code mirror.

Documentation checks run offline with node --test test/*.test.mjs: local links, JSON syntax and bounded client safety behavior. They create no real signatures, payments or blockchain requests. Full examples are additionally checked against canonical product schemas during release validation.

Limitations and security boundary

Base Mainnet only. Preflight accepts unsigned candidates; Verification accepts already-broadcast transaction hashes. No signing, broadcasting, custody or autonomous execution. DLL does not prove ownership of the supplied from address or authorize a transaction.

Simulation describes observed chain state; it does not guarantee future inclusion, success or application-level outcomes. The default L2-only fee is not total execution cost; optional network fee completeness describes only the supported conditional model. An unavailable fee is unknown, not zero. DLL does not verify net asset changes, comprehensively scan malicious contracts or guarantee Swap economic results. Keep private keys, credentials and other secrets out of requests. The Agent remains responsible for any later action.

Verification checks only the supplied expectations. Included, successful and canonical observations are not finalized-state guarantees. Its realized L2 fee is not total cost; total execution cost currently remains unavailable even if an L1 fee is observed.

Source: README.md at commit 2afd728

Tools

2

preflight_transaction

Base transaction simulation / Preflight

Before signing: simulate one unsigned Base Mainnet (8453) candidate (chain_id/from/to/value/data); inspect call success/revert, top-level destination and L2 fee constraints, Judgment, reason codes and evidence. Free; no API key, wallet or payment. Complete supported EIP-1559 fee_estimation context optionally estimates L1/L2/applicable Operator/Total Network Fee separately; legacy Judgment is unchanged, not automatic PASS. Inspect http_status, response.judgment and response.simulation. After broadcast use verify_transaction. No signing, broadcasting, custody, asset-delta/risk scan or execution guarantee.

Parameterscandidaterequiredconstraintsfee_estimation

verify_transaction

Base transaction inclusion / receipt Verification

After independent broadcast: verify a Base Mainnet (8453) transaction against explicit inclusion, receipt-status and optional candidate-field expectations. transaction_hash is required; default checks inclusion, NOT receipt success. Free; no API key, wallet or payment. Read http_status, response.verification.state and response.observation_errors; missing evidence is not success. Before signing use preflight_transaction. VERIFIED is not finality, ownership, causality, asset-balance change verification or a swap economic-outcome guarantee. No signing, broadcasting or custody.

Parametersexpectationtransaction_hashrequired

Version history

1
  1. v0.1.0LatestOct 13, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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