Been heads down building all weekend. Quick update for builders working in the agentic payments space.
Prompt Quality Score (PQS), the pre-flight quality gate for AI agent workflows, now accepts x402 payments on both Base mainnet and Solana, in addition to the existing free tier and API key access.
What PQS does
Before your agent sends a prompt to an expensive LLM endpoint, PQS scores it across 8 dimensions: clarity, specificity, context, constraints, output format, role definition, examples, and chain-of-thought structure. Returns a score 0–80, grade A–F, percentile ranking, and top 3 fixes. Catch weak prompts before they cost you tokens or USDC.
Not a builder? No problem, you can use PQS to improve your AI prompts too (for free) at https://pqs.onchainintel.net
Endpoint reference
# Free tier — no auth required
POST https://pqs.onchainintel.net/api/score/free
{ "prompt": "your prompt here", "vertical": "software" }
# Score + dimensional breakdown — $0.025 USDC via x402
POST https://pqs.onchainintel.net/api/score
# Full analysis + optimized rewrite — $0.125 USDC via x402
POST https://pqs.onchainintel.net/api/score/full
# Batch up to 5 prompts — $0.25 USDC via x402
POST https://pqs.onchainintel.net/api/score/batch
# A/B compare two prompts — $1.25 USDC via x402
POST https://pqs.onchainintel.net/api/score/compare
x402 payment details
- Base mainnet: CDP facilitator, USDC ERC-20, EIP-3009
TransferWithAuthorization - Solana: x402-compatible, USDC SPL token
- No account required for x402 path — agent pays per call, no subscription
- API key path also available for subscription-based access
MCP server
bash
npx pqs-mcp-server
Listed on Smithery (88/100), Official MCP Registry, Glama, and mcp.so. Three tools: score_prompt (free), optimize_prompt ($0.025), compare_models ($1.25).
Python SDK
bash
pip install pqs-sdk
Async support via AsyncPQSClient. Full x402 and API key auth.
OpenAPI spec: https://pqs.onchainintel.net/openapi.json
Building this as infrastructure for the agent economy — score the input before the inference fires. Cheaper than one bad prompt.
About OnChainIntel — AI-powered on-chain wallet analysis. We decode the behavioral patterns, hidden biases, and implicit bets behind any wallet's transaction history. Try it free at onchainintel.net · Follow us on X: @OnChainAIIntel · TikTok: @onchainintel · YouTube: @OnChainAIIntel
