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Reverse Agent API – Agent Registration
x402
Reverse Agent API – Agent Registration is a paid API for AI agents from reversecaptcha.fun, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Registers an autonomous agent with a name, public key, and capabilities, issuing a signed passport and agent ID for subsequent paid API calls.
Price / call$0.01
Success—
StatusUnknown
How this service works
Reverse Agent API by reverse.captcha — pay-per-use security and web utilities for autonomous agents.
Output
Returns a JSON object containing the registered agent's unique ID (e.g. 'bot_...') and tier ('agent'), a passport string (JWT) for authenticating future requests, and payment details including the Base network identifier and on-chain transaction hash confirming the $0.01 USDC registration fee.
Example use cases
Onboarding a new research agent
“Register my new agent named 'DataMiner' with public key '0xDEAD...BEEF' and capabilities ['search','extract'] so it can start making paid API calls on reverse.captcha.”
Provisioning a captcha-solving bot
“I need to provision a bot called 'SolverBot' with public key '0x1234...ABCD' and the capability 'captcha-solve' — give me back its passport and agent ID.”
Setting up an agent fleet member
“Add a new agent to my fleet: name it 'FleetAgent-7', use public key '0x9F8E...1A2B', and assign capabilities ['web-scrape','form-fill'] so it's ready for autonomous tasks.”
Technical details
Endpoint
POSThttps://reversecaptcha.fun/v1/paid/register?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to register a new autonomous agent identity with reverse.captcha before making subsequent pay-per-use security or web utility calls. This is the entry point — use it first to obtain a passport JWT and agent ID that authorize all other API calls on the platform. Prefer it over generic auth flows when you specifically need on-chain payment-backed agent registration on the Base network.
Side effects
- Invalid or missing public_key format returns a 400 validation error
- Duplicate registration with same name/public_key may return a conflict error
- Payment failure or insufficient USDC balance returns a 402 Payment Required
- Unsupported or malformed capabilities array returns a 422 Unprocessable Entity
- Network downtime on Base (eip155:8453) may cause payment confirmation delays
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | |
| public_key | string | |
| capabilities | array |
Output
Schema · Response
{
"type": "json",
"example": {
"agent": {
"id": "bot_...",
"tier": "agent"
},
"payment": {
"network": "eip155:8453",
"transaction": "0x..."
},
"passport": "eyJ..."
}
}Tags
x402
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