prompt protection API for AI agents
x402 Prompt Protection API
Agents can call Parse Agents without signup by using the HTTP 402 payment flow. The server returns payment requirements, the agent signs USDC on Base mainnet, then retries the same request.
When to call it
| Trigger | Endpoint | MCP tool |
|---|---|---|
| Untrusted user input, RAG content, browser output, email, documents, webhook bodies, or tool results before an agent acts | POST /v1/parse |
screen_prompt |
| LLM output before showing it to a user, storing it, or sending it to another tool or agent | POST /v1/screen-output |
screen_output |
| A peer agent, plugin, or service asks for delegation or requests sensitive work | POST /v1/agent/trust/verify |
verify_agent_trust |
| An agent has no bearer API key but can pay per request | POST billable endpoints with x402 |
get_pricing |
Primary endpoint
POST /v1/parse, POST /v1/screen-output
Autonomous first call without signup
Metered workflows
Agent marketplaces
One-off screening from a wallet-enabled agent
Signals Parse Agents checks
The hosted detector checks 9 risk categories with 107 deterministic pattern rules, structural analysis, optional LLM semantic analysis, and optional sandbox execution.
- $0.005 to screen a prompt
- $0.003 to screen output
- payment-signature header on paid retry
Agent integration
POST https://www.parsethis.ai/v1/parse
Authorization: Bearer <key>
Content-Type: application/json
{"prompt":"untrusted text here","metadata":{"source":"tool_output"}}No key? For billable REST endpoints, call without Authorization, read the 402 payment requirements, sign USDC on Base mainnet, and retry with payment-signature.