Large accounts stay yours
Continue selling directly, signing contracts, offering monthly settlement, prepaid credits, private SLAs, and custom support.
Why list your API on xpayapi.
Reach wallet-ready developers and agents with a provider-hosted paid endpoint, before turning your API into a full account, key, and invoice product.
Without xpayapi
Signup flow, API-key provisioning, usage ledger, invoicing, payment processor integration
With xpayapi
Directory listing and docs profile; open-source proxy you run for per-call stablecoin payment
Keep enterprise sales direct. Let the marketplace carry the long tail.
xpayapi is not meant to replace your sales team. It gives your API a second route to market: one that can serve overseas developers, small teams, and AI agents without turning each one into a manual customer relationship.
Marketplace handles small calls
For developers and agents, the directory lists your API and docs; your proxy handles per-call payment, receipts, metering, and access checks.
A new API distribution channel
The goal is not thousands of tiny accounts for your team to manage. It is a marketplace channel that converts scattered global demand into paid API traffic.
Why autonomous API payments should grow
Prediction: as agents move from pilots into real workflows, more API demand will arrive as software making small, authorized purchases. APIs that can be discovered, called, paid for, and audited without a sales conversation are better positioned to capture that demand.
Agents are moving into enterprise apps
Gartner predicts task-specific agents in 40% of enterprise applications by the end of 2026, up from less than 5% in 2025.
Agent experiments are becoming normal
Deloitte predicts 25% of companies using gen AI will launch agentic AI pilots or proofs of concept in 2025, rising to 50% in 2027.
Payment is moving into the agent flow
Stripe says “agents act for the buyer”; Coinbase documents “AI agents that autonomously pay for API access”; Cloudflare frames the bottleneck clearly: before an agent can pay, traditional onboarding requires account creation, a payment method, and an API key. With 402, the client receives a payment challenge, pays, retries with a credential, and gets the resource plus a receipt.
Who this is for
Selling AI, compute, or data services across borders? See the cross-border provider page →
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Enterprise API teams
Offer a low-friction paid lane for trials, agents, and developers while keeping production API traffic on infrastructure you operate. Contracted customers can still use your normal procurement, SLA, and support flow.
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Small SaaS & API startups
Test paid API demand before building a full SaaS billing surface. Start with route pricing and wallet settlement, then add accounts, plans, and enterprise terms only when customers ask for them.
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Independent developers & AI builders
Publish a priced endpoint from an existing project and learn whether developers or agents actually call it. Generated docs and pay-per-call pricing make the first experiment small.
What you get
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Discovery
Your listing is built from concrete endpoint metadata: category, OpenAPI paths, request schemas, examples, and route prices.
Evidence: callers can inspect the docs profile and compare paths and prices before making a paid request.
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No billing product to build
The open-source payment proxy quotes a price, verifies payment, forwards approved requests, and returns a receipt. You configure routes, prices, wallet, and upstream auth.
Evidence: proxy logs and receipts show the challenge, payment proof, verification result, and forwarded upstream request.
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Agent-ready by default
Every listed API follows the same payment handshake: request, price challenge, payment proof, retry, response, receipt.
Evidence: any client that implements the 402 payment retry can call a new listed API without a provider-specific billing integration.
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You stay in control
Caller traffic goes to your provider-hosted proxy and upstream API. xpayapi receives listing metadata for discovery and docs, not API request or response payloads.
Evidence: the public base URL points to infrastructure you configure; payment settles to the wallet address you set.
What you can verify before launch
This is not a traffic promise. It is a prelaunch checklist for judging whether small-unit payments, auditability, data boundaries, and marketplace distribution fit your API.
Can small calls make financial sense?
For low-price API calls, fixed card fees can dominate the transaction. Stripe’s public US card pricing lists 2.9% + $0.30 per successful card charge. Providers can compare that fixed-fee model with per-request stablecoin settlement before deciding which endpoints to expose.
Can each paid request be audited?
A test call shows the price challenge, payment proof, verification result, upstream request, and receipt. Providers can reconcile proxy logs and receipts instead of relying on a black-box bill.
Does API data stay on your path?
xpayapi needs listing metadata such as OpenAPI paths, categories, examples, and route configuration. The caller’s request body and provider response stay on the provider-hosted proxy and upstream API path.
Is this useful beyond direct sales?
Keep enterprise contracts direct, then expose selected endpoints to the marketplace for long-tail developers and agents. Start narrow, measure real paid usage, and expand only if the channel proves useful.
Ready for the technical picture? See how the payment proxy fits →
Common provider questions
- Is the software free? Is it open source?
- The payment proxy is open source and designed to run in your own infrastructure. Directory listing is free during preview. If xpayapi adds paid hosted services or platform fees later, those terms should be explicit before you opt in.
- Are there platform fees?
- The payment flow settles to the wallet you configure, so xpayapi does not need to custody funds or batch provider payouts. Directory pricing is free during preview; any future platform fee should be disclosed before it applies.
- Do I need to rewrite my API?
- No. Keep your existing HTTP or OpenAI-compatible service. The proxy sits in front, adds payment checks, and forwards approved requests upstream.
- Where do payments settle?
- Payments settle on-chain to the wallet you configure. The proxy verifies payment before it sends the request to your API.
- Who handles the API data?
- Your infrastructure does. xpayapi lists metadata for discovery and docs; caller requests and provider responses stay on your hosted API path.
- What if my API is private today?
- Start behind your existing ingress, expose it with Caddy, or use Cloudflare Tunnel while you test demand.
- What about SLA, latency, and rate limits?
- The proxy forwards only after it can verify payment, then your upstream handles the request normally. You still control timeouts, rate limits, auth requirements, monitoring, and API availability.
- Can I require KYC or restrict by jurisdiction?
- Payment does not replace your compliance controls. If you need customer auth, allowlists, regional controls, or manual review, keep those checks in your proxy or upstream service.
- Can I still sell enterprise contracts?
- Yes. Treat xpayapi as a pay-per-call entry lane for discovery, trials, and agents. Contracted customers can still use your existing procurement, invoicing, support, and SLA process.