Start free. Pay as your agent calls more APIs in production. No hidden fees, cancel anytime.
Prototype your agent, no card needed
Ship your first AI product without watching every call
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For agents in production that real users depend on
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High-volume or multi-agent systems
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Every HTTP call routed through the Callio gateway counts as one request, regardless of the upstream API, method, or payload size. Sandbox key traffic never counts toward your quota.
500 proxy requests per month and 2 sandbox keys so you can build, test, and install MCP into your agent before committing to a paid tier. No card required.
On Free and Builder, requests return a 429 until the next billing period or you upgrade. On Pro and Scale there is an overage rate ($2 and $1.50 per 1,000 requests respectively) so your agent keeps running — no hard cutoff.
For most upstream APIs, yes — you bring your own key (e.g., your OpenAI key, your SendGrid key) and Callio injects it at the proxy. It is stored AES-256 encrypted. Some public APIs work without any provider key.
Yes. Upgrade instantly and the new limits take effect immediately. Downgrade takes effect at the end of your current billing period. No lock-in contracts.
Yes — contact us for volume pricing, custom rate limits, SLAs, and on-premise options.