For API providers and agent builders

Your spec says what your API can do. Gecko shows what it does

Gecko is built for the agents that call your API, not the humans reading about it

Check your first call READ OUR DOCS

WebMCP moved execution into the browser

The first call is now the real one

How would you know if one of your failed calls came from a confused agent instead of a bug?

Most providers can't answer that yet
The traffic looks identical until it doesn't

SEED MISMATCH · CUSTOM ERROR 2006

▋

x402 transactions, liveM

Jun 26 0 →Jul 26 0 →Aug 26 0

Data: Dune community queries via agenteconomy.to

WHAT GECKO DOES

How it checks before it commits

Four behaviors that turn a guess into a verified call

simulated0 CU

actual0 CU

PUMP.FUN SELL

Predicts before it commits

Simulated cost matched actual mainnet execution exactly, 7 for 7, across 20 real transactions

Works with every agent

Any agent framework, any MCP client, one surface

spectransfer(amount: u64)

actual00000000 000000 0 0 00000 00000000

Reads what runs, not what's written

Recovers what a spec omits or gets wrong, straight from deployed code

0x00

Refuses instead of guessing

When the surface doesn't say something, it says so, not a plausible wrong answer

simulatedmainnet

Free before it's real

Provable at $0 offline, then on a mainnet fork, before anything signs

CASE STUDIES

A real transaction

An agent bought water on mainnet, sixteen times, and the receipt called every one

Four programs

Four live Solana programs, called blind, then called checked

A production API

A 43-operation API graded A, still missing what no spec can carry

GET STARTED

Your API already talks to agents. Does it know when they're wrong?

Every prediction we've made, and what it actually cost. Public, linkable

Get started

FOR DEVELOPERS

Building an agent that calls other people's APIs

One command adds Gecko to your agent. Pick your agent host, get the exact command, free

Start here, free