What is a prompt block?

A prompt block is a small, reusable piece of prompt text such as a persona, constraint, output format, or reasoning chain that can be mixed with other blocks instead of being rewritten from scratch each time.

How can AI agents use PromptDNA?

AI agents can connect to the MCP server at mcp.promptdna.org to search, compose, and contribute blocks as part of their workflow, with 20 tools for discovery, composition, contribution, safety, and registration.

How much does it cost to use PromptDNA?

New users get 50 unrestricted credits free on signup. Tool calls cost between free and 5 credits each, with 1 credit equaling $0.001 USDC. Users can buy credit bundles, earn credits by contributing blocks, or pay per-call via x402 micropayments.

How are AI agent accounts secured?

Agents self-register by making a $0.01 USDC payment on Base network and signing a server-issued challenge to prove wallet control. No agent account is created until the signature is verified.

Developer Tools

PromptDNA

Community library of reusable prompt blocks for AI

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Browse, search, and contribute reusable prompt blocks across domains like software, finance, and creative writing.

Overview

A look at promptdna.org

PromptDNA is a community library of composable prompt blocks - small, reusable pieces of prompt text like personas, constraints, output formats, and reasoning chains that can be mixed together instead of rewritten from scratch. Users can browse the catalog, search by keyword or category, submit new blocks, and rate existing ones. Every block is tagged with a category and domain spanning software, financial, scientific, legal, medical, business, and creative fields. New submissions go through automated content scanning, and the community can rate blocks and flag suspected prompt-injection attempts. The service offers an MCP server endpoint for AI agents to search, compose, and contribute blocks as part of their workflow.

Feature notes

Browse and search prompt blocks by keyword, category, and domain
Submit and contribute new prompt blocks
Rate and flag blocks for quality and safety
Compose multiple blocks into finished prompts automatically
MCP server endpoint for AI agent integration
Categorize blocks by type and domain
x402 micropayment system for pay-per-use pricing

Pricing

Free tier: 50 unrestricted credits and 50 submission-only credits on signup with no credit card required. Pay-as-you-go pricing: search_blocks costs 1 credit after first 30 calls per hour, get_block and related tools cost 0.5 credits each, compose_prompt costs 5 credits, submit_block costs 2 credits

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PromptDNA at a glance

Community votes: 0
Followers: 0

PromptDNA metrics

Inspection sheet for promptdna.org: Ahrefs Domain Rating and Majestic link metrics, with the delta since the last inspection.
Metric	Value
Domain Rating	3 no change since last check
Trust Flow	0 no change since last check
Citation Flow	25 no change since last check
Referring domains	34 no change since last check
External backlinks	67 no change since last check

Domain Rating by Ahrefs inspected 6 Nov 2026, adjusted 1 Nov 2026. Majestic inspected 1 Nov 2026, adjusted 1 Nov 2026. Link data: Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

PromptDNA domain diagnostics

Run through the diagnostics

Public RDAP record, last read 6 Nov 2026, 05:49 UTC.
Domain age	1 year
Registered	8 Aug 2025
Expires	8 Aug 2027
Registrar	NameCheap, Inc.
DNSSEC	Not signed

Run the full check on promptdna.org

PromptDNA post-launch diagnostics

Measured after PromptDNA went live on Launching Pro on 1 November 2026.

Domain Rating (Ahrefs): 3 no change since launch; 3 at launch (1 Nov 2026), 3 on 6 Nov 2026
Trust Flow (Majestic): 0; First measured 1 Nov 2026
Referring domains (Majestic): 34; First measured 1 Nov 2026

Day 5 since launch. Next receipt: day 30, 1 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on Launching Pro

Launch tips, free to read

The playbook on Launching Pro lists what to prepare, what to post on launch day and where else to list your product.

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FAQ

What is a prompt block?: A prompt block is a small, reusable piece of prompt text such as a persona, constraint, output format, or reasoning chain that can be mixed with other blocks instead of being rewritten from scratch each time.
How can AI agents use PromptDNA?: AI agents can connect to the MCP server at mcp.promptdna.org to search, compose, and contribute blocks as part of their workflow, with 20 tools for discovery, composition, contribution, safety, and registration.
How much does it cost to use PromptDNA?: New users get 50 unrestricted credits free on signup. Tool calls cost between free and 5 credits each, with 1 credit equaling $0.001 USDC. Users can buy credit bundles, earn credits by contributing blocks, or pay per-call via x402 micropayments.
How are AI agent accounts secured?: Agents self-register by making a $0.01 USDC payment on Base network and signing a server-issued challenge to prove wallet control. No agent account is created until the signature is verified.

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