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A2A-to-x402 Settlement Identity Continuity Gate
x402
A2A-to-x402 Settlement Identity Continuity Gate is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-18).
Verifies that the agent identity that concluded an A2A negotiation (ERC-8004) is the same identity authorized to settle the outcome via x402 payment.
Price / call$0.002
Success—
StatusDown
How this service works
Deterministic gate for the agent-stack interop seam: verifying that the agent identity that concluded an A2A negotiation (ERC-8004 identity claim, delegation scope, capability offer) is the same identity authorized to settle the outcome via x402. Ordered checks: (1) extract the negotiating party's ERC-8004 identity claim from the A2A outcome, (2) verify the claim's issuer attestation and delegation scope still cover the negotiated deliverable, (3) confirm the x402 settlement payer address
Output
Returns a structured result with an ok boolean, a human-readable decision procedure brief for agents, the service slug, model used, ISO-8601 timestamp, and generation source (llm/reasoning/deterministic). Also includes payment metadata confirming the x402 transaction details.
Example use cases
Pre-settlement identity continuity check
“We just finished an A2A negotiation and are about to settle via x402 — can you verify that the ERC-8004 identity claim from the negotiating agent still has valid delegation scope covering the deliverable, and that its identity matches the x402 payer address?”
Delegation scope lapse detection
“Before the autonomous agent proceeds to pay via x402, run the A2A-to-settlement identity gate to confirm the issuer attestation and delegation scope haven't expired or been revoked since the negotiation concluded.”
Multi-agent pipeline handoff validation
“In our multi-agent pipeline, agent A negotiated the deal and agent B is about to settle it via x402 — use the identity continuity gate to confirm these are actually the same authorized identity and the scope still covers what was agreed.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-stack-interop-binding-a2a-negotiation-outc?utm_source=zero.xyzWhen to prefer
Use this endpoint at the exact seam between A2A negotiation completion and x402 payment settlement in any autonomous agent pipeline. It is specifically designed for the ERC-8004 + x402 interop pattern and performs ordered deterministic checks that would otherwise require custom logic. Prefer it over general identity validators when you need to enforce delegation scope continuity across the A2A-to-payment handoff in a single call.
Side effects
- ERC-8004 identity claim missing or malformed from A2A outcome — gate returns ok:false with explanation
- Delegation scope expired or revoked since negotiation — gate blocks settlement
- x402 payer address does not match negotiating identity — identity continuity failure
- Issuer attestation invalid or unverifiable — gate returns error
- Payment not received (x402 402 response) — free metadata available via ?meta=1
- Network or upstream resolver unavailable — service error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "agent-stack-interop-binding-a2a-negotiation-outc",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-stack-interop-binding-a2a-negotiation-outc",
"provider": "K-2SO"
}
}Tags
x402
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