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Capability Negotiation Preflight
x402
Capability Negotiation Preflight is a paid API for AI agents from phion.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Compares required agent capabilities against offered capabilities before task execution to determine compatibility
Price / call$0.002
Success—
StatusUnknown
How this service works
Compare required and offered agent capabilities before execution
Output
Returns a structured comparison of required versus offered capabilities, identifying gaps, mismatches, or full compatibility, enabling the calling agent to decide whether to proceed, renegotiate, or reject the execution plan before committing resources.
Example use cases
Pre-execution capability gate for agent pipeline
“I'm about to kick off a multi-step agent pipeline and I need to confirm that the agent handling the payment step actually supports the capabilities required — can you run a capability preflight check before we proceed?”
Agent marketplace compatibility screening
“We're selecting an agent from the marketplace to handle our data extraction job — before we commit, check whether its offered capabilities match what our workflow requires and flag any gaps.”
Autonomous task handoff safety check
“Before my orchestrator hands off this research task to a subagent, I want a preflight check to make sure the subagent's capabilities line up with what's needed so we don't waste budget on an incompatible agent.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/capability-negotiation-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, signed preflight check before committing an agent task or budget — especially in multi-agent orchestration scenarios where capability mismatches would cause downstream failures. Prefer it over manual checks when you need an auditable, trust-layer-backed result that can be logged or disputed later.
Side effects
- Missing or malformed capability sets in the request body leading to validation errors
- Required capabilities not expressed in a recognized schema format
- Offered capabilities empty or undefined causing incomplete comparison
- Service unavailability returning a non-200 status
- Ambiguous capability identifiers that cannot be resolved to a known capability type
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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