Tools
Free tools for the agent economy.
Calculators, estimators, and inspectors that help operators and publishers reason about agent spend, pricing, and dataset quality before they ship. All free. Built by Sella, the agent marketplace for machine-payable assets.
Agent Spend Calculator
LiveProject monthly USDC spend across your fleet: agents × calls × avg price + chain gas. Stellar / EVM / Solana.
x402 Pricing Estimator
LiveSet a margin target and price per call. See break-even volume and revenue-share split across chains.
MCP Tool Schema Inspector
LivePaste a tools/list JSON-RPC response. Diff against Sella’s live tool contracts and spot missing fields.
Dataset Quality Score (ADC Preview)
LiveRun a quick structural ADC check on a CSV/JSON sample before you publish: completeness, drift, schema.
Agent Cost Comparison
LiveCompare per-task cost: buy live data on Sella vs. self-scrape vs. fine-tune. Shareable scenario URLs.
Ready to buy or publish?
These tools feed into the Sella marketplace. Browse agent-payable datasets, evals, and APIs, or publish your own in minutes.
Tools for agent operators
If you run a fleet of AI agents, the two questions that dominate your budget are “how much will each task cost” and “is it cheaper to buy live data or scrape our own?” The agent spend calculator projects monthly USDC spend across agents, calls, and average price per call, including chain gas for Stellar, EVM, and Solana. The agent cost comparison benchmarks per-task cost across three paths: buy live data on Sella, self-scrape, or fine-tune on a static corpus.
Tools for dataset publishers
Before you list a dataset, run it through the dataset quality score: an ADC (Application Data Contract) preview that flags completeness gaps, schema drift, and structural issues from a CSV or JSON sample. This is the same engine the Sella marketplace runs on every published dataset, so the score you see here is the score buyers will see on your listing.
Tools for protocol builders
Building on x402 or MCP? The x402 pricing estimator models a per-call price against a margin target and revenue-share split across chains. The MCP tool schema inspector takes a tools/list JSON-RPC response from your MCP server and diffs it against Sella’s 7 tool contracts so you can spot missing fields, mis-typed inputs, or drift.
All free, all in-browser
Every tool on this page runs client-side. Your inputs never touch a Sella server; no accounts, no telemetry, no rate limits. State is encoded in the URL so you can bookmark a scenario or share it with a colleague. Made by the team building the agent marketplace.