SML TOLLBOOTH — private logic in, paid outcome out
What does it cost to sell a private API as a pay-per-execution service? TOLLBOOTH pricing
TOLLBOOTH is ScriptMasterLabs' infrastructure that turns a private API, algorithm, dataset, model, or agent tool into a machine-discoverable pay-per-execution service — without publishing the implementation. Seller intake is free. Buyers pay per execution, at the price the seller sets, quoted fresh in each capability's own x402 challenge and settled only on accepted delivery.
TOLLBOOTH is ScriptMasterLabs' infrastructure that turns a private API, algorithm, dataset, model, or agent tool into a machine-discoverable pay-per-execution service — without publishing the implementation. Seller intake is free. Buyers pay per execution, at the price the seller sets, quoted fresh in each capability's own x402 challenge and settled only on accepted delivery.
Listing a capability costs $0. What a buyer pays is the seller's own per-execution price — stated in USDC, in the PAYMENT-REQUIRED response, before any payment is signed.
Last verified: November 5, 2026. Every price on this page was read from the product’s own live endpoint, pricing document, or 402 challenge on that date.
Pricing at a glance
Seller intake is free: preflight validates method, price shape and HTTPS origin without echoing the private origin back publicly, and wallet signing proves control of the intended payout wallet only — it does not authorize a payment. Activation remains operator-reviewed. There is no SML subscription for sellers.
Buyers pay per execution. Each protected capability exposes a fresh x402 v2 challenge under the exact scheme; the exact price is the seller-set price carried in that capability's current PAYMENT-REQUIRED response — no platform-wide price list exists, because each capability is priced by its own seller. Settlement follows deterministic acceptance checks: the run settles only on accepted delivery, and every run returns an accepted-delivery receipt.
Rails, read live from TOLLBOOTH's own rails endpoint: Base mainnet (eip155:8453, USDC) is the primary rail; Arc (eip155:5042, USDC) is the secondary rail. Both were active at the last read. Buyers receive the declared output — never the seller's private origin URL, credentials, source code, hidden formula, private prompt, or upstream response headers.
Prices verified live 2026-11-05.
Start free: run the free wrap preflight — POST https://scriptmasterlabs.com/api/tollbooth/wrap/preflight — and read the live rails at GET https://scriptmasterlabs.com/api/tollbooth/rails.
Use for / Don't use for
Use for: API, algorithm, dataset, model, or agent-tool owners who want agents to pay per execution while the implementation stays private — with delivery proven by accepted-delivery receipts instead of trust.
Don't use for: Publishing your implementation, or proving subjective quality. Receipts prove the delivery state TOLLBOOTH observed; they do not claim an output was correct, profitable, or accurate — and a 402 challenge is a price quote, not a sale.
Live evidence (read 2026-11-05)
TOLLBOOTH publishes its own machine surfaces, and they were read live on November 5, 2026. This is configuration and availability evidence from the service itself — not settlement history, and it is not presented as any.
| Surface | Route | Live read (2026-11-05) |
|---|---|---|
| Live payment rails | GET /api/tollbooth/rails | Base (eip155:8453, USDC) active, role primary; Arc (eip155:5042, USDC) active, role secondary |
| Machine manifest | GET /api/tollbooth | Published |
| Capability discovery | GET /api/tollbooth/discover | Published |
| OpenAPI 3.1 | GET /api/tollbooth/openapi.json | Published |
| Free wrap preflight | POST /api/tollbooth/wrap/preflight | Free |
| Accepted-delivery proof | GET /api/tollbooth/proof | Published |
TOLLBOOTH’s own truth boundary, kept verbatim in substance: a 402 is a payment challenge, not a purchase. Authorization is not settlement. Settlement is not accepted delivery.
TOLLBOOTH vs a public API listing vs selling subscriptions
| TOLLBOOTH | Publish the API publicly | Subscription SaaS | |
|---|---|---|---|
| Seller cost to start | 0 — free intake, no subscription | 0 (and your implementation is exposed) | Platform and billing overhead |
| Implementation stays private | Yes — buyers get the declared output only | No | Mostly |
| Buyer price | Seller-set, per execution, quoted in the 402 | Per call or key-based | Monthly seat |
| Settlement trigger | Accepted delivery, with receipt | Call time | Calendar |
| Rails | Base primary, Arc secondary (USDC, x402 v2) | Varies | Card |
How a call works?
The seller path: 1. Preflight — validate method, price shape and HTTPS origin (free; the private origin is never echoed publicly). 2. Wallet proof — sign the exact seller challenge with the payout wallet; raw upstream secrets are not accepted through public self-service intake. 3. Activate — approved capabilities enter machine discovery and become callable through their own x402-protected execution route. The execution path runs DISCOVER → QUOTE → VERIFY → EXECUTE PRIVATELY → ACCEPT → SETTLE → RELEASE → RECEIPT.
Honest limits
Activation is operator-reviewed, not instant self-serve: a capability goes callable after review, and TOLLBOOTH can decline capabilities it cannot verify or safely wrap. Per-execution prices are set by each seller, so this page quotes the mechanism, not a catalog of prices — the binding price for any capability is the one in its current 402 challenge. Accepted-delivery receipts prove the delivery state observed by TOLLBOOTH, never the subjective correctness of an output.
Frequently Asked Questions
Q: How much does TOLLBOOTH cost?
A: Seller intake is free and there is no SML subscription. Buyers pay per execution at the price the capability’s own seller set, quoted in USDC in that capability’s fresh x402 PAYMENT-REQUIRED response before any payment is signed. Settlement happens only on accepted delivery.
Q: Who sets the price of a TOLLBOOTH capability?
A: Its seller. Each protected capability exposes its own x402 v2 challenge carrying its seller-set price, so there is no platform-wide price list — the current challenge for the capability you are calling is the price document.
Q: Which networks does TOLLBOOTH settle on?
A: Base mainnet (eip155:8453, USDC) is the primary rail and Arc (eip155:5042, USDC) is the secondary rail — both read as active from TOLLBOOTH’s own live rails endpoint on 2026-11-05.
Q: What does the buyer receive?
A: The declared output of the capability, plus an accepted-delivery receipt. Never the seller’s private origin URL, credentials, source code, hidden formula, private prompt, or upstream response headers.
Q: Is a 402 challenge a purchase?
A: No — TOLLBOOTH’s own truth boundary: a 402 is a payment challenge, not a purchase. Authorization is not settlement, and settlement is not accepted delivery; the receipt is what proves delivery happened.
Start
Start free: preflight your API at POST https://scriptmasterlabs.com/api/tollbooth/wrap/preflight and read the machine manifest at GET https://scriptmasterlabs.com/api/tollbooth. Full catalog: /sml-products.