researcher stack · standard
Researcher Stack
For research agents: web search, retrieval, document parsing, and enrichment, with provenance-first routing and a tight per-call ceiling so a research run can't blow the budget.
The guardrails.
| Per-call ceiling | $0.02 USDC |
|---|---|
| Monthly budget | — |
| Confirm above | $0.5 USDC |
| Allowed rails | x402 · api_key · free |
| Blocked flags | financial_action · code_execution |
| Attestation floor | seed |
Capabilities & live candidates.
| Service | Provider | Rails | Tier |
|---|---|---|---|
| Exa | exa.ai | api_key | seed |
| Tavily | tavily.com | api_key | seed |
| SerpApi | serpapi.com | api_key | seed |
| Brave Search API | brave.com | api_key | seed |
| Service | Provider | Rails | Tier |
|---|---|---|---|
| Firecrawl | firecrawl.dev | api_key | seed |
| Exa | exa.ai | api_key | seed |
| Tavily | tavily.com | api_key | seed |
| SerpApi | serpapi.com | api_key | seed |
| Service | Provider | Rails | Tier |
|---|---|---|---|
| Jina AI Reader | jina.ai | api_key, free | seed |
| Unstructured | unstructured.io | api_key | seed |
| Mindee | mindee.com | api_key | seed |
| Service | Provider | Rails | Tier |
|---|---|---|---|
| Mindee | mindee.com | api_key | seed |
| Nango | nango.dev | api_key, oauth | seed |
Install the stack.
Pull the signed bundle once, cache it, and run pre-flight locally. Refresh policy on an interval; report outcomes back async. No per-call round trip.
MCP · agent-native
# MCP (server: https://mcp.stackbroker.xyz)
get_stack { "slug": "researcher", "bundle": true }Bundle · cache locally
curl "https://api.stackbroker.xyz/v1/stacks/researcher?bundle=1"