FabTally Chain · read-only · stateless · not financial advice
On-chain monitoring reads, a fraction of a cent a call.
Four live reads an AI agent or dev polls — when does an ENS/Basename name
expire, what's gas on a chain right now, when's a token's next unlock, and is a Chainlink
feed stale. Straight from public RPC and DefiLlama's public data. Read-only, keyless, nothing stored.
Paid per call in USDC on Base via x402 or a prepaid credit key. Also a standalone MCP server.
Paid per call — $0.001 to $0.003.
Agents pay per call in USDC on Base via x402 (no account — an unpaid call returns a
signed 402 challenge to pay-and-retry). Humans can prepay by card and send an
X-FabTally-Key: fabt_… header instead. Bad input → 400, never charged.
Every read has a rate-limited free teaser (this page uses them).
HTTP (x402) — POST any read as JSON:
curl -XPOST https://chain.fabtally.com/v1/ens-expiry \
-d '{"name":"vitalik.eth"}'
→ 402 with a signed x402 challenge; pay in USDC on Base and retry with the X-PAYMENT header.
Prepaid credit — add X-FabTally-Key: fabt_… to charge a card-funded balance instead.
MCP server — streamable-http: https://chain.fabtally.com/mcp · also stdio (npm: fabtally-chain-mcp).
4 tools (ens_expiry, gas, token_unlocks, oracle_health); paid tools relay the x402 challenge to pay-and-retry.
Discovery — /agent/overview · /openapi.json · /.well-known/x402