Hive Mcp Cdn MCP Server

hive-mcp-cdn

Edge cache for A2A capabilities — Hive Civilization

A small, inbound-only MCP server that caches arbitrary objects (agent cards, capability manifests, signed envelopes, anything an A2A pipeline reads more than once). Two-tier storage with an in-memory LRU and a SQLite warm tier, ETag and If-None-Match support, a purge endpoint, and per-request and per-GB metering through x402.

Council provenance: Ad-hoc, user-promoted 2026-04-27.

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What this is

Most A2A traffic is reads — the same agent card, the same capability list, the same signed proof — fanned out across a fleet that has no shared cache. hive-mcp-cdn is the missing edge cache. Agents put objects under a key and fetch them back through a cheap, ETag-aware GET.

• 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
• Brand gold: Pantone 1245 C / #C08D23
• Mode: Inbound only. ENABLE=true default.

Pricing

Settlement on Base L2 USDC. The recipient is the WALLET_ADDRESS env var.

Tools

REST endpoints

Storage model

Two tiers, both managed by the shim:

• Hot (LRU): an in-process Map with insertion-order recency. Bounded by CDN_LRU_MAX_ENTRIES and CDN_LRU_MAX_BYTES. Misses fall through to warm and promote on read.
• Warm (SQLite): better-sqlite3 at CDN_DB_PATH (default /tmp/cdn.db). One cache table with body, ETag, content type, size in bytes, created and expiry timestamps. A second egress table aggregates daily counters.

size_bytes is tracked per row and is the basis for the egress meter. ETags are computed once at write time as the SHA-256 hex of the body, truncated to 32 chars and double-quoted.

x402 flow

The first call to /v1/cdn/get without a token returns:

{
  "error": "payment_required",
  "payment": {
    "nonce": "<uuid>",
    "amount_usd": 1.0,
    "pricing": {
      "per_request_usd": 0.0002,
      "per_gb_egress_usd": 0.05
    },
    "accepts": [{ "chain": "base", "asset": "USDC", "recipient": "0x15184b..." }],
    "expires_at": 1777220000,
    "tier": 2,
    "product": "cdn_prepaid_bundle"
  }
}

Submit proof to /v1/x402/proof/submit:

{ "nonce": "...", "payer": "0x...", "chain": "base", "tx_hash": "0x..." }

…then call /v1/cdn/get with X-Hive-Access: hive_<token>. Each request decrements the prepaid balance by per_request + (bytes / 1GB) * per_gb_egress. The residual balance rides the X-Hive-Balance-USD response header.

Cache semantics

• Cache-Control: max-age=<s> on PUT sets the TTL. Default 300 seconds. Capped at 7 days.
• ETag is a strong validator (SHA-256 prefix in quotes).
• If-None-Match: <etag> on GET returns 304 Not Modified with no body and no egress charge.
• Expired entries are dropped lazily on read and on a 60-second sweep.
• A PUT over an existing key replaces the body, ETag, content type, TTL, and resets the hit counter.

Environment

What this server will not do

• Make outbound requests of any kind. The cache only holds what was put into it.
• Resolve URLs, fetch origins, or revalidate against a backing store.
• Enforce per-key access control. Treat keys as opaque namespaces and gate them upstream if you need privacy.
• Persist beyond the SQLite file. On a fresh container with a new /tmp, the cache is empty.

License

MIT.

Hive Gamification

This MCP server is part of the Hive Civilization gamification surface (10-mechanic capability taxonomy).

• Capability taxonomy: https://hive-gamification.onrender.com/.well-known/hive-gamification.json
• Centrifuge dashboard: https://hive-gamification.onrender.com/.well-known/hive-centrifuge.json
• Consolidated OpenAPI: https://hive-gamification.onrender.com/.well-known/openapi.json

Surface tags: gamification.spec.v1 · gamification.surface.public · gamification.signal.read-only · gamification.settlement.real-rails

Real rails on Base L2 (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Read-only signal layer. Brand gold #C08D23.