Best Alternatives to SALT19 Agent Utility Grid

Stripe AI

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MCP server integrating with Stripe - tools for customers, products, payments, and more.

WingmanProtocol Agent Gateway

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Async errands, artifact hosting, watches, memory + 15 calculators for AI agents. x402 on Base.

SettlementWitness

Runtime: Remote (SSE)

Deterministic verification gate for agent execution and x402 settlement.

Hera Agent Unity

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Control and verify a live Unity Editor through a local, low-token MCP server.

Arch Tools MCP

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61 AI agent tools under one key. Web, AI, voice, data, crypto & more. Stripe + x402 USDC payments.

Brazilian Central Bank (BCB) MCP

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Verified

MCP server for querying Brazilian Central Bank economic time series, including Selic, IPCA, exchange rates, GDP, and curated indicators.

Blackwall X402 Guardrail

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Pre-signature x402 payment verdict (GO/HOLD/STOP) for AI agents, with a verifiable signed receipt.

Kx402

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Kaspa x402 agent payer — pay x402 v2 services on Kaspa (KAS) per call, no account or API key

X402 MCP

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177 crypto market intel endpoints with auto x402 USDC micropayments from your AI agent

Agent Wallet

Runtime: npx

Local agent wallet + 900 pay-per-call data APIs — free discovery, x402 USDC, code-level spend caps

Confidential compute and inference sold to agents over x402 USDC, plus an agent wallet over MCP.

Deterministic JSON checks with signed evidence and x402-paid execution