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Agent Message-Delivery Attestation Standard: Verify Paid Message Was Delivered
x402
Agent Message-Delivery Attestation Standard: Verify Paid Message Was Delivered is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-21).
Returns a blunt, procedural decision brief for agents on how to verify that a paid message was actually delivered before treating the sender as having paid
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on agent message-delivery attestation standard: verify a paid message was actually delivered before treating the sender as paid-0. Blunt decision procedure, not marketing.
Output
A JSON response containing a plain-prose decision procedure (120+ words) describing the blunt steps an agent should take to verify a paid message was actually delivered, along with the topic, service slug, generation source (llm, reasoning, or deterministic), model used, and an ISO-8601 timestamp of generation.
Example use cases
Pre-credit sender delivery check
“Before I mark that agent as having successfully paid and delivered their message, can you fetch the decision procedure I should follow to verify the message was actually delivered — I don't want to credit them if delivery never happened?”
Onboarding agent to x402 messaging
“I'm building an agent that sends paid messages over x402 and I need to know the correct attestation steps for confirming delivery before treating a transaction as complete — can you get me that standard procedure?”
Auditing disputed message delivery
“One of our agents is claiming it sent a paid message but the recipient says it never arrived — can you retrieve the attestation decision procedure so I know exactly how to verify whether delivery actually occurred?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-message-delivery-attestation-standard-veri?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs a structured, authoritative decision procedure specifically for verifying that a paid x402 message was actually delivered to its recipient before crediting the sender. It is purpose-built for the agent message-delivery attestation use case on the x402 payment rail, distinct from general payment settlement or cross-ledger verification endpoints on the same host. Prefer it over broader payment verification endpoints when the specific concern is message delivery confirmation rather than fund settlement.
Side effects
- Payment not included or invalid: returns 402 with payment required details
- Invalid method (POST, PUT, etc.): only GET/HEAD/DELETE accepted
- Service unavailable: provider K-2SO backend offline or unreachable
- Malformed query parameters: topic or meta params with unexpected values may return errors
- Empty or missing brief in result: LLM generation failure may yield incomplete procedure text
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-message-delivery-attestation-standard-veri",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-message-delivery-attestation-standard-veri",
"provider": "K-2SO"
}
}Tags
x402
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