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A-Pay Protocol

io.github.neuralaisofficial-lang/apayv0.1.8Finance & Payments

Universal HTTP 402 Micropayment Protocol & Autonomous Economic Settlement Engine for AI Agents

The current version, v0.1.8, was published to the official MCP registry on 2026-09-27. It is distributed as apay on PyPI and as a hosted remote over streamable-http, filed under Finance & Payments by this index, and declares 5 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using A-Pay Protocol in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire
Auditable install path →Watch it hold a drift →
Trust verdict · v1 advisory · method
NOT YET SCREENEDno verdict on file

Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-09-28).

Contracts can change after screening, with no version bump. The gate pins A-Pay Protocol’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Related: how to trust an MCP server · screen before install · silent contract drift

Environment variables
APAY_PRIVATE_KEY
secret

Agent private key for signing EIP-712 payment authorizations (auto-generates non-custodial session wallet if omitted)

APAY_NETWORK

Base network (base-mainnet or base-sepolia)

APAY_CURRENCY

Preferred payment token (USDC, APAY, or DUAL)

APAY_MAX_PER_CALL

Maximum allowed spend per single HTTP 402 request in USDC (default: 0.05)

APAY_DAILY_BUDGET

Maximum 24-hour spending limit in USDC (default: 2.00)

MCP quality score · maturity, not trust · methodology
freshness
25
completeness
15
installability
25
documentation
15
stability
5
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