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Linkrra Pearl Pool — USDC Top-Up via x402
x402
Linkrra Pearl Pool — USDC Top-Up via x402 is a paid API for AI agents from pool.linkrra.com, paid per call via x402, $1/call, status unknown (last checked 2026-10-11).
Tops up a Linkrra Pearl Pool account balance by initiating a USDC payment on Base via the x402 payment protocol, returning the updated credit balance.
Price / call$1
Success—
StatusUnknown
How this service works
OpenAI-compatible inference paid per request in USDC on Base (eip155:8453, scheme exact). GET /v1/models for the model catalogue and per-model USD prices. Every paid route answers unauthenticated requests with an x402 v2 402 challenge (PAYMENT-REQUIRED header + JSON body). Contact: weare@linkrra.com
Output
Returns a JSON object with a boolean 'ok' field confirming success, plus 'balance' and 'credits' fields showing the updated account balance in micro-USDC units (e.g. {ok: true, balance: 4399472, credits: 4399472}).
Example use cases
Reload credits before a long AI job
“I'm about to run a big batch of AI inference requests on Linkrra and my balance is low — top up my Pearl Pool account with $20 USDC on Base right now so I don't get cut off mid-run.”
Automate monthly inference budget refill
“Set up my Linkrra Pearl Pool account to be topped up with $50 USDC on Base at the start of each month so my inference credits never run out.”
Fund a new inference account
“I just signed up for Linkrra's Pearl Pool and need to add some starting credits — deposit $5 USDC on Base to my new account so I can start making API calls.”
Technical details
Endpoint
POSThttps://pool.linkrra.com/api/billing/x402/topup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to add USDC credits to a Linkrra Pearl Pool account to fund subsequent OpenAI-compatible inference API calls paid per-request via x402. This is the correct endpoint for account top-ups, not for making inference calls directly. Prefer this over generic crypto transfer APIs because it integrates directly with Linkrra's credit system and returns a verified updated balance.
Side effects
- Payment rejected if x402 challenge response is invalid or malformed
- Insufficient USDC balance in the paying wallet causes transaction failure
- Wrong network (not Base/eip155:8453) results in payment failure
- Malformed request body missing required 'input' or 'output' fields returns 4xx error
- x402 scheme mismatch if not using 'exact' scheme returns 402 challenge again
- Network congestion on Base may delay on-chain confirmation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"balance": 4399472,
"credits": 4399472
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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