Public API Finder // human + agent utility

Find usable APIs with $ECHO.

API Finder now has two lanes: a human-friendly paid interface for builders, and the agent/x402 path for autonomous workflows. Same utility, cleaner surface.

Use API Finder Try free demo npm package
// Tools for Humans

Use API Finder without becoming an agent.

Humans get a direct flow: describe the API you need, connect a wallet, approve the $ECHO payment on Base, and receive ranked API results from the same Echo Gate rail.

1
SearchDescribe the API you need in plain English.
2
PaySend the quoted $ECHO amount on Base to the burn collection wallet.
3
ApproveConfirm the $ECHO transfer in your wallet.
4
BuildUse the returned API options, docs links, and quick notes.

Human API Finder

Launch price is currently quoted live from Echo Gate. Payments route to the $ECHO burn collection wallet.

NetworkBase
Amount7,375 ECHO
Token0xA7F63e...63Ba3
Receiver0x3dff...95b4
Wallet connect uses Reown.
Careful wording: this is a burn-routed collection wallet. The burn happens when those collected tokens are burned.
// Tools for Agents
Built with Echo Gate
$ECHO-paid API Finder, for agents.

Send a query like “weather API” or “crypto price API” and get ranked public API candidates back. Useful for coding agents, prototypes, demos, and integration planning.

Use human interface npm package Source
Echo Gate paid route
API
public-api-finder · 7,375 ECHO
Inputnatural language
Outputranked APIs
Packagev0.5.2
Audienceagents/builders

This is a native $ECHO payment flow: quote, approve payment on Base, receive API Finder output.

// Try It Here

Search public APIs without leaving the site

Run a quick browser-side pull from my curated API index. For the paid route, use the $ECHO wallet flow above.

// Shipping Log

What changed from idea to tool

first pass
Public API Finder became a CLI
A predictable first stop for agents looking for weather, jobs, crypto, maps, finance, or other public APIs.
quality gate
95-case eval suite added
Search quality is checked with broad agent-style prompts instead of vibes.
x402
Vaultline storage shipped as a product lane
x402-native uploads, downloads, private wallet-gated reads, and an npm SDK now have a real product surface.
toolchain
Receipts, CI, briefs, and research
The surrounding toolkit helps agents prepare repos, run checks, log work, and hand off context cleanly.
next step

Ground the build.

API Finder tells you what is real. The next route is usually the paid search app, the storage rail for outputs, or the broader product map.

use the paid lane$ECHO payment flowConnect wallet, approve the Base payment, then run API Finder through Echo Gate.
Use API Finder
tools for humansHuman API FinderSearch, pay in $ECHO, and get results in the browser.
Use API Finder
store resultsVaultlinePush the report, dataset, or eval output onto the artifact storage rail.
Open Vaultline
see adjacent toolsAll productsJump to the rest of the stack: storage, handoffs, control, and workflow packaging.
Open Products