> ## Content Index > Fetch the complete content index at: https://stablecoininsider.org/llms.txt > Use this file to discover other available public pages before exploring further. # Tether AIsa Investment: How AI Agents Pay Per API Call - URL: https://stablecoininsider.org/tether-aisa/ - Published: 2026-10-19T12:29:13.000Z - Updated: 2026-10-19T12:29:16.000Z - Description: Tether Capital backed AIsa on 15 Oct 2026. Stablecoin Insider maps AIsa's three ways for AI agents to pay per call (prepaid credit, x402 USDC via Circle Gateway, MPP), prices a real research-agent day, and flags what the docs don't settle. - Author: Alexandra - Tags: AI, Stablecoins, Tether The Tether AIsa investment, announced on 15 October 2026, isn't a big cheque by Tether standards. Neither side disclosed the amount, according to [crypto.news](https://crypto.news/tether-invests-aisa-ai-agent-funding-9m/). What makes it worth a close look is what Tether bought into: a gateway where AI agents find paid APIs, data and models and pay for each call themselves. Tether Capital called it a strategic investment in a company that lets AI agents "access and pay for data, software, and computing services," with usage billed in fiat or stablecoins under spending limits set by the business, per [Tether's announcement](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/). The headlines stopped there. The payment plumbing is where it gets interesting, and a little awkward for Tether. Stablecoin Insider read AIsa's billing, x402 and machine-payment docs, priced a real research-agent workday from its published per-call catalog, and lists the gaps a finance or engineering lead should check before handing an agent a wallet. ### Key Takeaways - Tether Capital invested in AIsa on 15 Oct 2026; terms weren't disclosed ([Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/)). - The seed extension took AIsa's total funding above $9 million ([AIsa](https://aisa.one/blog/aisa-seed-extension-tether-hiven)). - AIsa reports 250,000+ agents and 100 million+ transactions processed ([Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/)). - Its x402 rail settles in USDC through Circle Gateway on 11 EVM mainnets ([AIsa GitHub](https://github.com/AIsa-team/nanopayment-x402)). - A 5 USDC deposit covers about 500 Perplexity Sonar calls ([AIsa catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md)). 🚦 Status check: AIsa is live and selling today. Tether's stake, AIsa's valuation and the round size are undisclosed. The on-chain payment rail AIsa documents is USDC via Circle Gateway, not USDT, and neither the Tether nor the AIsa announcement names a USDT integration. ## What the Tether AIsa deal is AIsa announced its seed extension on 15 October 2026, with Tether and HIVEN joining as strategic investors. The round lifted total funding to more than $9 million, and the new names join Alibaba, Tribe Capital, Sumitomo Corporation, Draper Associates and Saison Capital, per [AIsa's release](https://aisa.one/blog/aisa-seed-extension-tether-hiven). The company is headquartered in San Francisco. The earlier money came in July, when Alibaba and Tribe Capital co-led a seed round and AIsa put its funding at $6.5 million, [crypto.news reported](https://crypto.news/tether-invests-aisa-ai-agent-funding-9m/). The gap between the two totals is at least $2.5 million, but that's a floor, not the size of the extension, since AIsa hasn't broken it out. Tether's capital came through Tether Capital, its El Salvador based investment arm, which deploys money from Tether's profits and excess reserves, per [Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/). Paolo Ardoino framed it around control: "As AI agents take on more work, people need a way to give them access to services while keeping control over what they spend." Stablecoin Insider's profile of [Paolo Ardoino](https://stablecoininsider.org/paolo-ardoino/) covers the background of the executive behind the bet. AIsa founder and CEO Jordan Liu said enterprise agents "need trusted information, useful tools and a governed way to transact," in the statement [Cointelegraph](https://cointelegraph.com/news/tether-backs-aisa-as-strategic-investor-completing-seed-extension-round) carried on 18 October. AIsa also says it has started pilot programs with enterprises in financial intelligence, market research, supply chain management and commerce, without naming them ([AIsa](https://aisa.one/blog/aisa-seed-extension-tether-hiven)). ## What AIsa sells: one key for APIs, models and payment Strip away the funding news and AIsa is an API gateway built for agents. Its docs describe one key for the major LLMs plus 100+ real-time data APIs, with pay-per-use billing ([AIsa docs](https://aisa.one/docs/guides)). The homepage lists 110+ models, 40+ skills and data sources such as Similarweb, Semrush, X, YouTube, CoinGecko and Perplexity, and names x402, USDC, Circle Nanopayments and MPP as payment options ([aisa.one](https://aisa.one/)). The pitch to an agent builder is simple. Instead of opening a Tavily account, a CoinGecko plan and a financial-data contract, the agent calls everything through AIsa and each call is metered against one budget. AIsa's homepage puts the median API call at $0.012 across 982 live endpoints, and median chat-model pricing at $0.62 per million input tokens and $2.36 per million output tokens across 90 models ([aisa.one](https://aisa.one/)). Plans are light. Pay-as-you-go has no subscription. Builder costs $39 a month for $50 of API credits, and Team costs $200 a month for $260, with data APIs billed at the upstream provider's price on every plan ([AIsa pricing](https://aisa.one/pricing)). Model usage is billed separately at standard model rates, the same page says. ## How AI agents pay on AIsa: three rails compared This is the part the funding coverage skipped. AIsa runs three separate payment paths, and they don't cover the same endpoints. Stablecoin Insider built this table from AIsa's [billing docs](https://aisa.one/docs/guides/pricing), its [machine payments page](https://aisa.one/docs/integrations/machine-payments) and its [x402 skill on GitHub](https://github.com/AIsa-team/nanopayment-x402). | | Prepaid balance (API key or MCP) | x402 pay-per-call | MPP pay-per-request | | --------------- | --------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- | | Account needed | Yes, an AIsa account ([AIsa MPP docs](https://aisa.one/docs/integrations/machine-payments)) | No; the agent's wallet pays ([AIsa skill](https://github.com/AIsa-team/nanopayment-x402)) | No; the client pays each request ([AIsa MPP docs](https://aisa.one/docs/integrations/machine-payments)) | | How it's funded | Top-up in the console, completed on Stripe's hosted page ([AIsa billing](https://aisa.one/docs/guides/pricing)) | USDC deposited into Circle Gateway on one of 11 EVM mainnets ([AIsa skill](https://github.com/AIsa-team/nanopayment-x402)) | An MPP wallet; the challenge method is currently tempo ([AIsa MPP docs](https://aisa.one/docs/integrations/machine-payments)) | | What it covers | Every model and API endpoint | 104 data endpoints; LLM calls stay on the key-based API ([AIsa docs commit](https://github.com/AIsa-team/docs/commit/ecae7917973c84b4cabe0f47a2ea2576ac2d1477)) | Selected read-only data endpoints such as prediction markets, financial data and web search | | Spend control | Per-key spending limit is the hard ceiling ([AIsa security](https://aisa.one/docs/guides/security)) | Whatever sits in the Gateway deposit, plus a capped token approval | The agent's own policy; AIsa lists per-request, per-task and approval limits to set first | | Settlement | Deducted from the shared balance per call | Signed offchain, settled in batches by Circle Gateway ([Circle](https://developers.circle.com/gateway/nanopayments)) | Settled per request through the MPP challenge | | Best fit | Ongoing use with usage logs | Agents that already hold USDC and want no account | Occasional calls by agents holding an MPP wallet | The Stablecoin Insider team's read: most companies will start on the prepaid balance, because it's the only rail that covers models as well as data, and it's the only one with a per-key hard cap. The x402 rail is the interesting one for stablecoins. An agent with a funded wallet can call a paid endpoint with no signup at all, which is the whole promise of [x402](https://www.x402.org/). If you're choosing between agent payment standards more broadly, Stablecoin Insider's [x402 vs AP2 vs ACK-Pay comparison](https://stablecoininsider.org/x402-vs-ap2-vs-ack-pay/) lays out where each one fits. ## How the x402 USDC flow works, step by step AIsa's open-source skill for agents documents the flow in five steps. Paid endpoints live under the /apis/v2/ path, while /apis/v1/ uses an API key, and the skill warns never to mix them ([AIsa GitHub](https://github.com/AIsa-team/nanopayment-x402)). 1. **Call.** The agent requests a paid /apis/v2/ endpoint with no key ([AIsa skill](https://github.com/AIsa-team/nanopayment-x402)). 2. **Challenge.** The server answers HTTP 402 with a payment-required header listing accepted networks and the amount. 3. **Sign.** The agent signs an EIP-712 TransferWithAuthorization for USDC against Circle's GatewayWalletBatched contract. No gas is spent on this step. 4. **Retry.** The agent resends the request with the signed payment in the headers. 5. **Settle.** AIsa verifies the signature, Circle Gateway settles in a batch, and the data comes back. Before any of that, the wallet needs real USDC and a little native gas on a mainnet, then a deposit into the Gateway Wallet contract. There's no faucet. The skill says to set a capped approval rather than an unlimited one, and warns that sending USDC straight to the Gateway address instead of calling deposit() loses the funds ([AIsa GitHub](https://github.com/AIsa-team/nanopayment-x402)). Circle's side is what makes sub-cent pricing workable. Gateway Nanopayments let buyers sign offchain and settle net positions in bulk, with payments as small as $0.000001 USDC, per [Circle's docs](https://developers.circle.com/gateway/nanopayments). Stablecoin Insider's walkthrough on [making a Circle agent nanopayment in USDC](https://stablecoininsider.org/how-to-make-a-circle-agent-nanopayment-in-usdc/) covers the Gateway deposit and signing in more detail. ## Worked example: what a research agent's day costs Take a competitor-monitoring agent that runs once each working day. Every price below comes from AIsa's x402 [endpoint catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md), which is the authoritative price list for /apis/v2/ calls. The call counts are Stablecoin Insider's assumptions. | Task | Endpoint | Price per call | Calls | Cost | | -------------------- | ----------------------------------------------------------------------------------------------------------------- | -------------- | ----- | ---------- | | Web search | Tavily Search ([catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md)) | $0.0096 | 20 | $0.192 | | Cited answers | Perplexity Sonar | $0.012 | 10 | $0.120 | | Profile lookups on X | Twitter Get User Info | $0.00044 | 50 | $0.022 | | Company financials | Income Statements | $0.048 | 5 | $0.240 | | Token prices | CoinGecko (flat price for the category) | $0.008 | 30 | $0.240 | | **Total per run** | | | 115 | **$0.814** | At $0.814 a run and 22 working days, the data bill is about $17.91 a month. A 5 USDC Gateway deposit pays for six full runs ($4.884) with $0.116 left, so an agent on the x402 rail needs a top-up roughly every week. The catalog's own guidance is to top up 5 USDC once the balance falls below 0.5 USDC ([AIsa catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md)). Now add the model. If each run also burns 400,000 input tokens and 100,000 output tokens at AIsa's median rates of $0.62 and $2.36 per million ([aisa.one](https://aisa.one/)), that's $0.248 plus $0.236, or $0.484 a run and about $10.65 a month. Those calls can't go over x402, because the /apis/v2/ mirror is data-only ([AIsa docs commit](https://github.com/AIsa-team/docs/commit/ecae7917973c84b4cabe0f47a2ea2576ac2d1477)), so the agent needs a prepaid balance as well. What the math says about plans: at about $17.91 of data a month, the $39 Builder plan's $50 of credits ([AIsa pricing](https://aisa.one/pricing)) only pays off once data spend passes $39 a month, which this agent hits at a bit more than two runs a day, or if you need Builder's 200 requests a minute. For one daily run, pay-as-you-go is cheaper. ## Why Tether backed a USDC-settled gateway Here's the awkward part. The only on-chain rail AIsa documents settles in USDC, the dollar token of Tether's biggest rival, through Circle's own Gateway contracts ([AIsa GitHub](https://github.com/AIsa-team/nanopayment-x402)). Tether's announcement says usage is billed "in fiat or stablecoins" and never names USDT ([Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/)). Neither does AIsa's release. Stablecoin Insider's take on the logic: Tether isn't buying today's payment rail, it's buying a seat in the place where agents choose one. AIsa already sits between 250,000+ agents and thousands of paid resources, by its own count. Adding a second settlement asset to a gateway that already speaks x402 is a much smaller job than building that distribution from scratch. It also fits a pattern Tether spelled out. The AIsa deal follows its NEURA Robotics investment, which included plans to put Tether's Wallet Development Kit (WDK) and QVAC into robots so machines can run AI locally and transact within set limits ([Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/)). Agents that spend money are a new market for whichever dollar token they hold. Other stacks already accept more than one: the [Celo buy marketplace](https://stablecoininsider.org/celo-buy-marketplace/) lets agents pay in USDC, USDT and USAT. ## The downside: what AIsa's docs and numbers don't settle - Undisclosed terms. Tether's stake, the round size and AIsa's valuation are all private ([crypto.news](https://crypto.news/tether-invests-aisa-ai-agent-funding-9m/)), so the deal says little about how much weight Tether puts behind it. - Self-reported traction. The 250,000+ agents and 100 million+ transactions are AIsa's own figures as relayed by Tether, with no split between free, card-funded and stablecoin-settled calls ([Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/)). - Catalog counts that don't match. The homepage says 5,000+ APIs, skills and models, the docs say 100+ data APIs, and the x402 catalog lists 104 endpoints ([AIsa docs](https://aisa.one/docs/guides)). Check that the endpoint you need is on the rail you plan to use. - Two pricing stories. The pricing page promises no markup on data APIs, while the homepage FAQ says you pay provider rates plus a transparent platform fee ([AIsa pricing](https://aisa.one/pricing)). Read your console's itemized log, not the marketing copy. - Caps that don't cap. A max-price header and a batch quote both check the estimate before a call, but neither caps the final charge on metered endpoints, and every successful retry is billed again ([AIsa billing](https://aisa.one/docs/guides/pricing)). Only a per-key spending limit is a hard ceiling. - Wallet limits on x402\. Gateway Nanopayments need EOA signatures and don't support ERC-1271, so smart-contract agent wallets can't use the batched rail ([Circle](https://developers.circle.com/gateway/nanopayments)). AIsa also uses a custom EIP-712 domain that the standard x402 EVM scheme doesn't handle without its own client. - Exit timing. If Circle's APIs go down for a long stretch, the trustless Gateway withdrawal path takes a 7-day delay ([Circle](https://developers.circle.com/gateway/concepts/technical-guide)). Keep deposits small. Who carries the bill when an agent overspends is still a contract question, not a protocol one. Stablecoin Insider's explainer on [who is liable when an AI agent overspends](https://stablecoininsider.org/who-is-liable-when-an-ai-agent-overspends/) walks through where that risk lands. ## Who should try AIsa, and who should wait | Team | Fit | Why | | ------------------------------------- | ----------- | ------------------------------------------------------------------------------------------------------------------------- | | Solo builders running research agents | Good | One key replaces several data contracts, and pay-as-you-go has no subscription ([AIsa pricing](https://aisa.one/pricing)) | | Crypto-native agents holding USDC | Good | The x402 rail needs no account, only a funded Gateway deposit | | Enterprises needing audit trails | Pilot first | Per-key limits and usage logs exist, but pilots are unnamed and traction is self-reported | | Treasuries that want to pay in USDT | Wait | No USDT path is documented yet | | Teams on smart-contract wallets | Wait | Batched Gateway payments need EOA signatures | 🧭 Stablecoin Insider's take: the Tether AIsa investment is a cheap option on a real problem. Agents can't sign up for forty vendor accounts, and AIsa's answer, one metered key with stablecoin pay-per-call on the side, works today. The tell to watch is the settlement asset. Right now the on-chain money flows through USDC and Circle's contracts. If a USDT or USAT rail shows up on AIsa within a few quarters, Tether bought distribution. If it doesn't, Tether bought a small stake in a rival's rail. ## What to watch next - Any USDT or USAT option in AIsa's payment docs or 402 challenges ([AIsa MPP docs](https://aisa.one/docs/integrations/machine-payments)). - Named enterprise pilots, which AIsa says are already running ([AIsa](https://aisa.one/blog/aisa-seed-extension-tether-hiven)). - Whether more endpoints reach the x402 and MPP rails beyond today's 104-endpoint catalog ([AIsa catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md)). - MPP methods beyond tempo, listed on [mpp.dev](https://mpp.dev). [Read AIsa's x402 skill on GitHub](https://github.com/AIsa-team/nanopayment-x402) Picking a payment standard for your own agents? Stablecoin Insider's comparison of x402, AP2 and ACK-Pay lays out who settles, who signs and where each one fits. [Compare x402 vs AP2 vs ACK-Pay ](https://stablecoininsider.org/x402-vs-ap2-vs-ack-pay/) [How to Make a Circle Agent Nanopayment in USDC (2026)Step-by-step guide to funding Circle Gateway and signing a sub-cent USDC payment from an AI agent.![](https://stablecoininsider.org/favicon.ico)Stablecoin Insider](https://stablecoininsider.org/how-to-make-a-circle-agent-nanopayment-in-usdc/) ## FAQ #### What is the Tether AIsa investment? Tether Capital made a strategic investment in AIsa, an AI-agent API and payment gateway, announced on 15 October 2026\. The amount wasn't disclosed, per [Tether](https://tether.io/news/tether-invests-in-aisa-to-expand-its-push-into-ai-powered-payments-and-programmable-money/). #### How much has AIsa raised? More than $9 million in total after the seed extension with Tether and HIVEN, per [AIsa](https://aisa.one/blog/aisa-seed-extension-tether-hiven). It reported $6.5 million in July, per [crypto.news](https://crypto.news/tether-invests-aisa-ai-agent-funding-9m/). #### Can AI agents pay AIsa in USDT? Not in the docs Stablecoin Insider reviewed on 19 October 2026\. The documented on-chain rail is USDC through Circle Gateway ([AIsa GitHub](https://github.com/AIsa-team/nanopayment-x402)), and the prepaid balance is topped up through Stripe. #### Does an agent need an AIsa account to pay? Not on the x402 or MPP rails, which pay per request over HTTP 402\. Models and account endpoints still need an API key, per [AIsa](https://aisa.one/docs/integrations/machine-payments). #### Which chains does AIsa's x402 rail accept? Eleven EVM mainnets: Ethereum, Base, Avalanche, Arbitrum, OP, Polygon, Unichain, Sonic, World Chain, Sei and HyperEVM, per the [AIsa skill](https://github.com/AIsa-team/nanopayment-x402). #### How much does an AIsa API call cost? It depends on the endpoint. The x402 catalog runs from $0.00044 for an X profile lookup to $0.12 for full financial statements ([AIsa catalog](https://github.com/AIsa-team/nanopayment-x402/blob/main/references/endpoint-catalog.md)). #### Can a business cap what its agent spends on AIsa? Yes. A per-key spending limit is the hard ceiling. Max-price headers and quotes only check estimates and don't cap the final charge, per [AIsa billing](https://aisa.one/docs/guides/pricing). #### Who are AIsa's other investors? Alibaba, Tribe Capital, Sumitomo Corporation, Draper Associates, Saison Capital and HIVEN, alongside Tether, per [AIsa](https://aisa.one/blog/aisa-seed-extension-tether-hiven). --- Forward look: the Tether AIsa deal will be judged on one line of AIsa's docs, the list of assets a 402 challenge accepts. Today it reads USDC. If you're building an agent that pays its own way, start on the prepaid balance with a hard per-key limit, test x402 with a small Gateway deposit, and re-check the accepted assets each quarter. This content is provided for informational and educational purposes only and does not constitute financial, investment, legal, or tax advice; it is not financial advice, and no material herein should be interpreted as a recommendation, endorsement, or solicitation to buy or sell any asset or token. AIsa's prices, supported chains and payment methods are set by AIsa and Circle and can change; check the live docs and the live 402 challenge before an agent pays. Nothing here is a solicitation to buy or sell.