MemoryGuard
Memory-poisoning firewall for AI agents: screen content before it is written to long-term memory. Blocks persistent instructions, sleeper triggers, trust/payment poisoning, injection, hidden Unicode and secrets; flags PII with a redacted copy. allow|review|block, source-aware.
1 route settlement-verified · $0.002 USDC/request · 1 endpoint · Data · base network · x402 protocol
Verified routes
POST /v1/screen· $0.002 · Verified with a $0.002 test payment on 10 Nov 2026 · receipt
Other routes are unverified.
Networks: Base (settlement-verified)
Discovery is free. Agents search the catalogue here. Payment happens on the listing 402, not on PayAPI.
url https://payapi.market/mcpListing facts
- Provider
- PromptShield
- Hosted at
memoryguard.grindfree.net- Category
- Data
- Price
- $0.002 USDC per request
- Payment networks
- Base
- Settlement-verified
- 1 route, last checked 2026-11-10
- Listed on PayAPI Market
- 2026-11-09
Try MemoryGuard
Call a verified route without paying first. The server should answer HTTP 402 Payment Required with the price, the USDC asset, the network and the wallet to pay. An x402 client pays that amount on Base and retries with the payment header.
curl -i -X POST "https://memoryguard.grindfree.net/v1/screen"About this API
MemoryGuard is listed in the Data category with pricing at $0.002 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-11-10. View receipt on Basescan.
Payments settle on base in USDC via the x402 protocol. AI agents discover this API through the PayAPI Market MCP server and pay per request without API keys or accounts.
This API exposes 1 endpoint.
Add this badge to your README
Paste this on your site. The link points at this listing. Listing is free and providers keep 100%.
Markdown
[](https://payapi.market/api/memoryguard)
HTML
<a href="https://payapi.market/api/memoryguard"><img src="https://payapi.market/badge/memoryguard.svg" alt="Settlement-verified on PayAPI Market" height="20"></a>
Questions about this API
What does MemoryGuard do?
Memory-poisoning firewall for AI agents: screen content before it is written to long-term memory. Blocks persistent instructions, sleeper triggers, trust/payment poisoning, injection, hidden Unicode and secrets; flags PII with a redacted copy. allow|review|block, source-aware. It is provided by PromptShield.
How much does MemoryGuard cost?
MemoryGuard is priced at $0.002 USDC per request, paid per call with no subscription. Verified with a $0.002 test payment on 10 Nov 2026. The exact amount for each call is in the HTTP 402 response before any money moves.
Do I need an API key or account to use MemoryGuard?
No. MemoryGuard uses the x402 protocol, so an agent pays per request in USDC on Base and gets the response, with no API key, account or signup.
Has MemoryGuard been verified?
Yes, 1 route. PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC settlement on-chain, most recently on 2026-11-10.
How does an AI agent find MemoryGuard?
Through the free PayAPI Market MCP server at https://payapi.market/mcp, using search_apis or get_api, or over plain HTTP at https://payapi.market/agent/search. Discovery is free; the agent pays the provider directly on the listing's own 402.
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