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Fatstack

Pay-per-call tools for AI agents

Visit fatstack.net →

A non-custodial marketplace where AI agents discover and pay for API and MCP tool calls in USDC on Base. Agents pay per request via HTTP 402 flow with no accounts or API keys; spend caps and host allowlists are enforced before payment. Includes payFetch SDK (@fatstack/x402) and an MCP endpoint exposing the catalog as callable tools. 14 live tools at time of crawl, from $0.0005 per call.

Category
MCP servers
Pricing
usage_based · from $0.0005 per call
Free tier
unknown
API
yes
MCP server
yes
SDK
yes
Open source
unknown

#x402#usdc#base#pay-per-call#mcp#ai agents#marketplace

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Listed 2026-10-25 · last verified 2026-10-25 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.85

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API
curl https://toolgrep.com/api/products/fatstack