Hive Barter

io.github.srotzinPublished by GitHub account srotzinv1.0.0Updated Oct 24, 2026

Multi-party agent barter — non-cash capability exchange with cryptographic receipts

VerifiedStreamable HTTPWeb executableFinanceDeveloper ToolsBusiness & Commerce

Overview

AI-generated overview

Remote MCP server that scans 402-enabled MCP endpoints, probes their asking prices and issues pre-signed USDC counter-offers on Base.

What you can do
  • Discover 402-enabled MCP endpoints from public registries with last-seen asking prices
  • Probe a target with up to five quote requests to estimate its reservation price
  • Build a single-shot, pre-signed counter-offer at a configured floor percentage
  • Settle accepted counters on-chain and book the realized spread
  • Read today's and running P&L: probes sent, counters accepted, USDC spread
When to use it
For operators running an automated agent-to-agent arbitrage loop who want an assistant to find paid MCP endpoints, probe their prices and place small USDC counter-offers within fixed caps. Not useful for ordinary research or coding work.
Requirements
Remote endpoint at hive-mcp-barter.onrender.com over Streamable HTTP (POST /mcp); the README suggests connecting via npx mcp-remote. Real settlement needs a funded Base wallet and the PRIVATE_KEY environment variable for signing, plus ENABLE_OUTBOUND=true to run the outbound loop. Optional settings include BASE_RPC, MAX_DAILY_SPEND_USD, MAX_SINGLE_COUNTER_USD and COUNTER_PCT.
Before you install
Counter-offers spend real USDC on Base, and the pre-signed transaction is the whole commitment, so a target can broadcast it without further confirmation. Signing requires PRIVATE_KEY for a funded wallet; the README warns never to commit it. Enabling ENABLE_OUTBOUND starts an automatic loop that probes third-party endpoints and places bids, and the server sends requests to external registries and targets with attribution headers.

Installation

In SourceWeft

  1. Open Hive Barter 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.srotzin%2Fhive-mcp-barter/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": {
    "hive-barter": {
      "type": "http",
      "url": "https://hive-mcp-barter.onrender.com/mcp"
    }
  }
}

README

hive-mcp-barter

[srotzin/hive-mcp-barter MCP server]

Outbound 402 arbitrage agent — Hive Civilization

Probes 402-enabled MCP endpoints, counter-offers below asking, and settles when the spread clears our resale floor. Pure protocol — no DMs, no spam. Attribution headers on every request.

Council provenance: Ad-hoc, user-promoted 2026-04-27 (Tier A position 1).

What this is

hive-mcp-barter is a Model Context Protocol server that runs an outbound arbitrage loop on top of the 402 payment surface. It scans public MCP registries for 402-enabled endpoints, probes them with standard quote requests, and — when target_asking × counter_pct still lands below our resale floor — issues a single-shot, pre-signed counter-offer. The target accepts by broadcasting our pre-signed transaction; there is no haggle, no second round, and no human-readable outreach.

  • Protocol: MCP 2024-11-05 over Streamable-HTTP / JSON-RPC 2.0
  • Transport: POST /mcp
  • Discovery: GET /.well-known/mcp.json
  • Health: GET /health
  • Settlement: USDC on Base L2 — real rails, no mock, no simulated
  • Brand gold: Pantone 1245 C / #C08D23

Tools

ToolTierDescription
barter_discover0 (free)List 402-enabled MCP endpoints from a public registry (glama, smithery, mcp.so) with last-seen asking prices.
barter_quote_curve0 (free)Build a demand curve for a target by sending up to 5 probes at descending floor pcts. Returns the reservation-price estimate.
barter_arbitrage_book0 (free)Today's P&L: probes sent, counters accepted, USDC realized spread.

REST endpoints

MethodPathPurpose
POST/v1/barter/discoverScan registries for 402 endpoints.
POST/v1/barter/probeSend a 402-style quote request to a target.
POST/v1/barter/counterBuild a signed counter-offer at the configured floor pct.
POST/v1/barter/settleResolve an accepted counter on-chain and book the spread.
GET/v1/barter/ledgerRunning P&L, attempts, wins, spread.
GET/v1/barter/todayToday aggregate (Tier 0, free).
GET/healthService health.

Counter-offer envelope

json
{  "x402_version": 1,  "intent": "counter_offer",  "originator_did": "did:hive:morph",  "asking_seen_usd": "0.05",  "offer_usd": "0.0325",  "offer_atomic_usdc_base": "32500",  "tx_pre_signed": "0x...",  "expires": "2026-04-27T20:30:00Z",  "attribution": {    "agent": "hive-mcp-barter",    "attribution_id": "barter-{uuid}",    "policy": "single-shot-no-haggle"  }}

The pre-signed transaction is the entire commitment. The target accepts by broadcasting; we never have to re-sign on accept.

Resale floor

CategoryOur buy floorOur resell
LLM tokens$0.000020 / token$0.000040 / token
Oracle reads$0.0008 / read$0.0015 / read
Storage writes$0.00012 / write$0.00025 / write
KYC checks$0.04 / check$0.08 / check

If target_asking × counter_pct ≤ our_resell × 0.95, we counter. Otherwise we skip — there is no margin.

Risk controls

CapValue
Max single counter$0.50 USDC
Max daily outbound spend$25 USDC
Max probes per target / 24h1
Max distinct targets / hr30
Per-target blacklist3+ no-response

All caps fail-closed. Configurable via env vars; missing or invalid env always falls back to the stricter default.

Configuration

EnvRequiredDefaultNotes
PORTno3000
ENABLE_OUTBOUNDnofalseDefault-off. The 5-min cron loop only runs when set to true.
WALLET_ADDRESSno0x15184…436eW1 MONROE on Base.
USDC_BASEno0x833589…2913USDC contract on Base.
BASE_RPCnohttps://mainnet.base.org
HIVECOMPUTE_URLnohttps://hivecompute-g2g7.onrender.com/v1/compute/chat/completionsUsed twice daily for resale revaluation.
MAX_DAILY_SPEND_USDno25
MAX_SINGLE_COUNTER_USDno0.50
COUNTER_PCTno0.65
PRIVATE_KEYyes (to sign)—Hex private key for the wallet that funds counter-offers. Never commit this. Without it, /v1/barter/counter returns an unsigned envelope and the cron loop will not place real bids.

Signing is opt-in. The repo does not include a key. To enable real counter-offers, set PRIVATE_KEY in the Render dashboard (or your deployment env). To enable the 5-min cron loop, set ENABLE_OUTBOUND=true.

Run locally

bash
git clone https://github.com/srotzin/hive-mcp-barter.gitcd hive-mcp-barternpm installnpm start# server up on http://localhost:3000/mcpcurl http://localhost:3000/healthcurl http://localhost:3000/.well-known/mcp.jsoncurl http://localhost:3000/v1/barter/today

Connect from an MCP client

Claude Desktop / Cursor / Manus — add to your mcp.json:

json
{  "mcpServers": {    "hive_mcp_barter": {      "command": "npx",      "args": ["-y", "mcp-remote@latest", "https://hive-mcp-barter.onrender.com/mcp"]    }  }}

Hive Civilization

Part of the Hive Civilization — sovereign DID, USDC settlement, agent-to-agent rails. Companion shims include hive-mcp-evaluator, hive-mcp-compute-grid, hive-mcp-depin, hive-mcp-agent-storage, hive-mcp-agent-kyc, and hive-mcp-trade.

License

MIT (c) 2026 Steve Rotzin / Hive Civilization

Hive Civilization Directory

Part of the Hive Civilization — agent-native financial infrastructure.

Brand: #C08D23

Source: README.md at commit 0ec5c78

Tools

0
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Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

85% of the applicable checks met

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