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Caesar is free to use. You can make the first call without an account, key, credit card, or credit balance: 
curl -s https://search-api-staging-779189860552.europe-west1.run.app/v1/search \
  -H "Content-Type: application/json" \
  -d '{"query": "postgres 17 logical replication failover", "max_results": 3}'

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Free tiers

TierPriceSetupBest for
AnonymousFreenoneEvaluation, demos, local agents, quick scripts
API keyFreepartner access onlyHigher throughput, attribution, repeat integrations
Anonymous requests use the same public API as keyed requests. A key does not unlock a different endpoint or a different result shape; it gives you a dedicated rate-limit bucket and account-scoped attribution. See authentication.

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Rate limits

TierIncluded limit
Anonymous30 requests/second per client IP
API keyPer-key limit, default 100 requests/second
Every response includes X-RateLimit-* headers and an access.rate_limit block so agents can back off without guessing. Details: rate limits.

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No credits to manage

There are no credits, request packs, overage meters, or billing settings. If Caesar introduces paid plans later, this page will be updated before billing is required. The current contract is simple: search, read, and feedback are free to use.

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Getting more capacity

Higher throughput currently requires an API key, and API keys are restricted to partners. If you have a partner key, keep it in CAESAR_API_KEY or use caesar-search auth login; never paste key material into a chat or docs page.

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FAQ

No. Anonymous access works for search, read, and feedback. Use a key only when you have partner access and need higher throughput or account-scoped attribution.
A key gives requests a dedicated per-key rate-limit bucket. It does not change endpoint URLs, response fields, or the search-read-feedback contract.
Yes. Feedback uses the same free access model as search and read.
The API returns HTTP 429 with X-RateLimit-* headers. Wait until X-RateLimit-Reset, reduce fan-out, or use a partner key if you have one.
Partner API keys are currently restricted. If you already have one, use CAESAR_API_KEY; otherwise keep using anonymous access until partner access is arranged.