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Confirm x402 and agent stablecoin payments

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What are agentic payments?

Agentic payments are stablecoin payments that AI agents make on their own, often one small payment for each API call under a protocol such as x402.

Agent platforms and the wallet providers behind them need a record of every payment an agent made, and a warning before an agent runs past the budget its owner set.

Goldsky spots each payment from an agent’s wallet, delivers it to your database or backend and keeps each agent’s spend total in your database, while the wallet’s spending policy and the limit alerts stay with you.

Who uses agentic payments?

AI agent platforms, agent wallet providers, payment platforms and stablecoin payment providers that let software agents pay for APIs and services.

How agentic stablecoin payments work

The diagram follows one agent from the wallet it’s given to the alert near its spending limit, and shows who does each step. Your setup may differ.

Your business, step 1: Wallet providerGive each agent a walletWith a spending policy you set
Goldsky, step 2: TurboWatch the agent’s walletAdded to the watch list, no redeploy
Your business, step 3: Agent calls a paid APIThe server answers with a price
Your business, step 4: Wallet providerAgent’s wallet signsOnly within the wallet’s policy
Blockchains, step 5: Payment settlesOften through the seller’s facilitator
Goldsky, step 6: TurboSpot the paymentTransfer and authorization events, decoded
Goldsky, step 7: TurboWrite a rowIn your database, keyed on the payment
or
Goldsky, step 7: TurboSend a webhookOne call per payment
Your business, step 9: Alert near the limitEach total against the agent’s budget
Goldsky, step 8: TurboKeep spend per agentA running total in your database
  • Goldsky
  • Your provider

How to track agentic stablecoin payments

Goldsky runs a pipeline that picks out payments from your agents’ wallets, decodes them, writes each one to your database or sends it to a webhook, and keeps a running spend total for each agent in your database. Your code raises the alert when an agent nears its limit.

What you’ll need

  • Goldsky Turbo
  • A wallet provider that gives each agent a wallet with a spending policy
  • A database for the agent wallet list and spend totals, plus a webhook endpoint if you want a call per payment
  • The spending limit you set for each agent
  • Code that checks each total against its limit and sends alerts

  1. Give each agent a wallet with a spending policy

    An agent pays from its own wallet, and the policy on that wallet is the hard stop on what it can spend.

    Your wallet provider creates the wallet and enforces the rules you set, such as a cap per payment or a list of sellers. If an agent shares a wallet with others, nobody can tell which agent spent what.

  2. Watch the agent’s wallet

    Handled by Goldsky Turbo

    You only see payments from wallets you’re watching, so each new agent’s wallet has to go on the list.

    The list has to update as soon as a wallet is created, without restarting anything. An agent starts paying the moment it’s deployed, and payments made before its wallet is watched are missing from its total.

    With Goldsky, you can keep the agent wallets in a Turbo Pipelines dynamic table, which lives in a Postgres database. Insert a row and the running pipeline picks the wallet up, with no redeploy.

    Learn about dynamic tables (opens in a new tab)

  3. Agent calls a paid API

    Agentic payments usually start when an agent asks for something that costs money and the server responds with a price.

    Under a protocol such as x402, the server replies with HTTP 402 Payment Required and the amount, and the agent decides whether to pay. Your agent’s instructions decide which prices it accepts.

  4. Sign the payment within the wallet’s policy

    Paying takes a signature from the agent’s wallet, and the policy decides whether that signature is allowed.

    The wallet provider signs only payments that fit the policy and refuses the rest. A policy loose enough to sign anything leaves your spend tracking as the only check, and tracking reports spend after it happens.

  5. Settle the payment on the chain

    The payment counts once it’s recorded on the chain, where both sides can check it.

    Often the seller’s facilitator, a service that submits signed payments for the seller, puts the payment on the chain. For a short time the newest blocks can still be rewritten, so a payment seen once isn’t final yet.

  6. Spot and decode each payment

    Handled by Goldsky Turbo

    Your records need every payment an agent made, in a form your code can read.

    Each payment shows up as a token transfer, and a payment made with a signed authorization also leaves an event from the token contract. Both have to be read from the raw log data into named fields (decoded), or payments made through a facilitator can be missed.

    Turbo Pipelines can filter token transfers to the agent wallets on the list and decode the token’s events in SQL with _gs_log_decode() and the contract’s ABI, so each row carries the payer, amount and transaction.

    Decode logs with an ABI (opens in a new tab)

  7. Record each payment

    Handled by Goldsky Turbo

    Your spend tracking and your backend need each payment as a database row or a call they can act on.

    Delivery can repeat after a network error or a restart, and a reorg can undo a payment you already recorded. Keying each payment on a stable ID lets a repeat overwrite the same row and lets a correction remove it.

    You can write each payment to a database table with a primary_key, where repeats and reorg corrections land on the same row, or sends it to a webhook that receives the corrections and dedupes on the row ID.

    How repeats and reorgs reach you (opens in a new tab)

  8. Keep spend per agent

    Handled by Goldsky Turbo

    A limit applies to what an agent has spent in total over the budget period, not to one payment.

    Add each payment to its agent’s total for the period you budget for, such as the day or the month. The total has to follow the recorded payments, so a payment undone by a reorg (the chain replacing its newest blocks) comes off it again.

    Turbo Pipelines can keep a running sum per key in your database with its postgres_aggregate sink. Group by agent wallet and a period column set in SQL, keeping the _gs_op column that marks deletes, and each payment is added as it arrives and taken off again if a reorg removes it.

    Keep running totals in your database (opens in a new tab)

  9. Alert near the limit

    The agent’s owner wants to know before a budget runs out, not after.

    Your code compares each agent’s total with its limit and alerts your team or the owner as it gets close. The wallet’s policy is still the hard stop; the alert is the warning before it.

What you control

Your team
  • Agent calls a paid API
  • Alert near the limit
Your providers
  • Wallet provider

Security and deployment

  • SOC 2 Type IIIndependently audited security controls.
  • Dedicated infrastructureSingle-tenant options for production workloads.
  • Data residencyCloud, on-premises or co-located.

More use cases that detect deposits

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Track agentic stablecoin payments with Goldsky

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