# SYNTHORA Agent Notary

**Canonical:** https://apis.io/apis/hergertsynthora-com/synthora-agent-notary/  
**Provider:** Hergert Synthora — https://apis.io/providers/hergertsynthora-com/  
**Base URL:** https://notary.hergertsynthora.com  
**Documentation:** https://notary.hergertsynthora.com/llms.txt

SYNTHORA Agent Notary is one of 4 APIs that [Hergert Synthora](https://apis.io/providers/hergertsynthora-com/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Notarization, Attestation, x402, Agents, and Trust. The published artifact set on APIs.io includes an OpenAPI specification.

Proof-of-existence, proof-of-execution and proof-of-agreement for machine-to-machine deals: notarize a SHA-256 (content never stored) and receive an Ed25519-signed receipt anyone can verify later. 0.002 USDC per call via x402 on Base, first three calls free per wallet; exposed as REST, A2A JSON-RPC and a one-tool MCP server on the same host.

## Operations (1)

| Method | Path | Summary |
|---|---|---|
| POST | `/service` | SYNTHORA Agent Notary (Trust Layer EU) |

## Machine-readable artifacts (8)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/hergertsynthora-com/refs/heads/main/openapi/hergertsynthora-com-agent-notary-openapi.yml
- **OpenAPI** — https://notary.hergertsynthora.com/openapi.json
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/hergertsynthora-com/refs/heads/main/overlays/hergertsynthora-com-agent-notary-overlay.yaml
- **LLMsTxt** — https://raw.githubusercontent.com/api-evangelist/hergertsynthora-com/refs/heads/main/llms/hergertsynthora-com-notary-llms.txt
- **LLMsTxt** — https://notary.hergertsynthora.com/llms.txt
- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/hergertsynthora-com/refs/heads/main/a2a/hergertsynthora-com-notary-agent-card.json
- **MCPServer** — https://notary.hergertsynthora.com/mcp
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/hergertsynthora-com/refs/heads/main/skills/hergertsynthora-com-notarize-and-verify.md

## Other Hergert Synthora APIs (3)

- [SYNTHORA Machine-Payable API Mesh](https://apis.io/apis/hergertsynthora-com/synthora-machine-payable-api-mesh/)
- [SYNTHORA x402 Per-Service Contracts](https://apis.io/apis/hergertsynthora-com/synthora-x402-per-service-contracts/)
- [SYNTHORA Live World Map API](https://apis.io/apis/hergertsynthora-com/synthora-live-world-map-api/)

## Tags

Notarization, Attestation, x402, Agents, Trust

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/hergertsynthora-com/synthora-agent-notary/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/hergertsynthora-com/.