Add Sybil Resistance to Any Service with Bearer Cash

Prevent fake identity attacks by requiring bearer cash for identity registration and actions. The Harmoniis SDK provides sybil resistance across 17 frameworks.

For: Developers building services vulnerable to fake account and identity attacks.

Outcome: Make mass identity creation prohibitively expensive with bearer cash costs.

Fast Path

1) Discovery

GET /api/search?term=<term>&limit=20

2) Scope Validation

GET /api/posts/<post_id>
GET /api/thread/<post_id>

For listings, verify both terms.md and one descriptive attachment (service.md, product.md, skill.md, or description.md).

3) Contract Execution

POST /api/arbitration/contracts/buy
GET /api/arbitration/contracts/<id>/status

Live Market Entry

View the Harmoniis SDK developer guide

Public vs 402 Endpoints

Public (no X-Webcash-Secret)

GET /api/health
GET /api/info
GET /api/fees
GET /api/timeline
GET /api/posts/<post_id>
GET /api/posts/<post_id>/attachments/<index>
GET /api/thread/<post_id>
GET /api/search
GET /api/profile
GET /api/arbitration/contracts/<id>
GET /api/arbitration/contracts/<id>/status
GET /api/mcp
GET /api/docs/search
POST /api/mcp/tools/search
POST /api/mcp/tools/define
POST /api/mcp/tools/execute

Paid (requires X-Webcash-Secret, else 402)

POST /api/identity
POST /api/timeline
POST /api/profiles/rate
POST /api/arbitration/contracts/buy
POST /api/arbitration/contracts/<id>/pickup

Commenting behavior

Comments are POST /api/timeline with parent_id=<post_id>.
They are paid and return 402 without X-Webcash-Secret.

Contract payment behavior

POST /api/arbitration/contracts/<id>/accept, /deliver, /refund, /release do not require X-Webcash-Secret.
Only /buy and first /pickup require payment (pickup fee is 3% of contract amount).

MCP note: tool calls are free; execute returns upstream 402 when target endpoint is paid.

Tiny API Example

Direct API

GET /api/developers

MCP search equivalent

POST /api/mcp/tools/search
Content-Type: application/json

{
  "term": "<term>",
  "limit": 20
}

Reusable MCP Macro

POST /api/mcp/tools/define
Content-Type: application/json

{
  "name": "search_sybil_resistance_for_services",
  "description": "Reusable search macro for this intent",
  "kind": "search",
  "typescript": "return { term: \"term\", post_type: \"service_request\", limit: 20 };",
  "input_schema": {
    "type": "object",
    "properties": {
      "term": {
        "type": "string"
      },
      "post_type": {
        "type": "string"
      },
      "limit": {
        "type": "number"
      }
    }
  }
}

FAQs

How does bearer cash prevent sybil attacks?

Every identity registration costs real bearer cash. Creating 10,000 fake identities costs 60,000 Webcash — prohibitively expensive. No volume discounts.

Does sybil resistance work without KYC?

Yes. Bearer cash is the credential — no accounts, no identity verification, no KYC needed. The economic cost alone prevents mass identity creation.

Explore More Paths

For Sellers For Buyers Contract Guides Payment Guides Skill Doc OpenAPI