# Services from agent-gas-station.agent-gas-station.workers.dev on Zero

> agent-gas-station.agent-gas-station.workers.dev serves 50 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/agent-gas-station.agent-gas-station.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/agent-gas-station.agent-gas-station.workers.dev/health.json

## Services

- [Agent Rest Stop – FreshNonce](https://www.zero.xyz/c/agent-rest-stop-freshnonce-83980fcb/llms.txt): $0.01/call via x402. Returns the next transaction nonce for a given address on a specified blockchain chain by reading from a public RPC node.
- [Agent Rest Stop – UnitScale Decimal Converter](https://www.zero.xyz/c/agent-rest-stop-unitscale-decimal-converter-158dc75c/llms.txt): $0.01/call via x402. Converts an integer amount from one decimal unit to another (e.g. wei to ether, satoshis to BTC)
- [Agent Rest Stop – FieldPick (JSON Path Filter)](https://www.zero.xyz/c/agent-rest-stop-fieldpick-json-path-filter-891f43ee/llms.txt): $0.01/call via x402. Filters a JSON document to retain only the specified named paths, discarding all other fields.
- [Agent Rest Stop Hex/UTF-8 Converter](https://www.zero.xyz/c/agent-rest-stop-hex-utf-8-converter-b7880095/llms.txt): $0.01/call via x402. Converts a string between hexadecimal encoding and UTF-8 text in either direction.
- [Agent Rest Stop – Locker Read](https://www.zero.xyz/c/agent-rest-stop-locker-read-fe66ddbb/llms.txt): $0.01/call via x402. Reads a locker object (or its backup copy) by key from Agent Rest Stop's key-value store.
- [Agent Rest Stop – Store JSON Document](https://www.zero.xyz/c/agent-rest-stop-store-json-document-90785e11/llms.txt): $0.01/call via x402. Stores a single JSON document (up to 8KB) for later retrieval by an agent or downstream hop.
- [Agent Rest Stop – Allowlist Stamp](https://www.zero.xyz/c/agent-rest-stop-allowlist-stamp-ffb082fb/llms.txt): $0.01/call via x402. Checks whether a given address passes or fails against a named allowlist stored in Cloudflare R2.
- [Agent Gas Station GasBuffer](https://www.zero.xyz/c/agent-gas-station-gasbuffer-4e3fc917/llms.txt): $0.01/call via x402. Returns a gas cost estimate for a given number of transactions on a chain, calculated as cached gas quote multiplied by tx_count with a 20% safety cushion added.
- [Agent Rest Stop – StablePeg](https://www.zero.xyz/c/agent-rest-stop-stablepeg-3c3f57dc/llms.txt): $0.01/call via x402. Returns the cached mid-price of a stablecoin relative to one US dollar
- [Agent Rest Stop SHA-256 Hash Comparison](https://www.zero.xyz/c/agent-rest-stop-sha-256-hash-comparison-ee1d3be1/llms.txt): $0.01/call via x402. Compares two values by computing and matching their SHA-256 hashes, returning whether they match.
- [Agent Rest Stop - x402 Receipt Audit](https://www.zero.xyz/c/agent-rest-stop-x402-receipt-audit-63f541f0/llms.txt): $0.01/call via x402. Validates the shape of an x402 payment receipt without re-settling the payment
- [Agent Rest Stop – llms.txt Template Filler](https://www.zero.xyz/c/agent-rest-stop-llms-txt-template-filler-0817b783/llms.txt): $0.01/call via x402. Generates a filled llms.txt document from a name, links, and purpose description
- [Agent Rest Stop – Agent Card Template Filler](https://www.zero.xyz/c/agent-rest-stop-agent-card-template-filler-782a37e4/llms.txt): $0.01/call via x402. Generates a filled agent card by populating a fixed template with a given agent name, tools list, and purpose description.
- [Agent Rest Stop – DeadlineGuard](https://www.zero.xyz/c/agent-rest-stop-deadlineguard-a4a97fb8/llms.txt): $0.01/call via x402. Checks whether a given Unix timestamp deadline has passed, returning a pass or stop signal for time-gated agent workflows.
- [Agent Rest Stop – Clock Skew](https://www.zero.xyz/c/agent-rest-stop-clock-skew-b8d7d2aa/llms.txt): $0.01/call via x402. Computes the difference in seconds between a client-supplied Unix timestamp and the server's current worker time, returning the clock skew delta.
- [Agent Rest Stop – USD to Sats Quote](https://www.zero.xyz/c/agent-rest-stop-usd-to-sats-quote-cb9618b1/llms.txt): $0.01/call via x402. Converts a USD amount into a satoshis (sats) quote, returning the USDC value in 6-decimal precision alongside a sats-labeled result.
- [Agent Rest Stop BannerMint](https://www.zero.xyz/c/agent-rest-stop-bannermint-56b004b9/llms.txt): $0.01/call via x402. Stores an SVG banner (with a title and a line of text) and returns the hosted URL of the stored banner.
- [Agent Rest Stop – Retry/Pay/Abort Decision Engine](https://www.zero.xyz/c/agent-rest-stop-retry-pay-abort-decision-engine-e384d597/llms.txt): $0.01/call via x402. Given an error status from an API call, decides whether the agent should retry the request, pay to proceed, or abort the operation entirely.
- [Agent Rest Stop – EIP-55 Address Checksum](https://www.zero.xyz/c/agent-rest-stop-eip-55-address-checksum-4009ceea/llms.txt): $0.01/call via x402. Returns the EIP-55 checksummed version of an Ethereum address along with a short list of supported chain IDs
- [Agent Rest Stop – Idempotency Key Generator](https://www.zero.xyz/c/agent-rest-stop-idempotency-key-generator-28f5db54/llms.txt): $0.01/call via x402. Generates and returns a stable idempotency key for a given buyer+resource pair, valid for 24 hours.
- [Agent Rest Stop DuplicateGuard](https://www.zero.xyz/c/agent-rest-stop-duplicateguard-ac23dc4a/llms.txt): $0.01/call via x402. Checks whether a buyer has already purchased a specific resource today, returning a new or duplicate purchase status.
- [Agent Rest Stop – Block Lag](https://www.zero.xyz/c/agent-rest-stop-block-lag-acd92393/llms.txt): $0.01/call via x402. Returns how many blocks behind the cached head a given chain's client block is.
- [Agent Rest Stop – Tool Discovery by Need](https://www.zero.xyz/c/agent-rest-stop-tool-discovery-by-need-74bbd629/llms.txt): $0.01/call via x402. Searches for available tools/APIs matching a described need, returning relevant tool suggestions for AI agents.
- [Agent Rest Stop – SlippageCap](https://www.zero.xyz/c/agent-rest-stop-slippagecap-8ce6c1bb/llms.txt): $0.01/call via x402. Returns the largest trade amount (in USD) that still fits under a given slippage cap expressed in basis points
- [Agent Gas Station MinFill Threshold Check](https://www.zero.xyz/c/agent-gas-station-minfill-threshold-check-20c5e2a6/llms.txt): $0.01/call via x402. Validates whether a given output amount meets or exceeds a minimum fill floor, returning a pass or fail result.
- [Agent Rest Stop Pair Allow](https://www.zero.xyz/c/agent-rest-stop-pair-allow-d48f2378/llms.txt): $0.01/call via x402. Checks whether a given asset pair (have/want) is permitted according to the configured pair allowlist.
- [Agent Rest Stop - Stale Quote Checker](https://www.zero.xyz/c/agent-rest-stop-stale-quote-checker-f76a06e4/llms.txt): $0.01/call via x402. Checks whether a previously obtained quote is fresh or stale based on a configurable maximum age in seconds.
- [Agent Rest Stop – SizeCap (Document Byte-Cap Fitter)](https://www.zero.xyz/c/agent-rest-stop-sizecap-document-byte-cap-fitter-b2094c49/llms.txt): $0.01/call via x402. Truncates or fits a document to a specified maximum byte size, returning a compacted version that does not exceed the byte cap.
- [Agent Rest Stop – JournalTail](https://www.zero.xyz/c/agent-rest-stop-journaltail-92bc3184/llms.txt): $0.01/call via x402. Returns the last N receipt IDs recorded for a given buyer, providing a tail view of that buyer's payment journal.
- [Agent Rest Stop – FeeAdd](https://www.zero.xyz/c/agent-rest-stop-feeadd-3c8058a9/llms.txt): $0.01/call via x402. Calculates a fee amount in USD by applying a basis-point rate to a subtotal, rounding to the nearest cent.
- [Agent Rest Stop - Unix Window Open/Closed Check](https://www.zero.xyz/c/agent-rest-stop-unix-window-open-closed-check-c87ad592/llms.txt): $0.01/call via x402. Determines whether a given unix timestamp range represents an open or closed time window.
- [Agent Rest Stop Budget Split](https://www.zero.xyz/c/agent-rest-stop-budget-split-4d598bf7/llms.txt): $0.01/call via x402. Splits a total USD budget across weighted items without exceeding any individual cap.
- [Agent Rest Stop – MCP Manifest Generator](https://www.zero.xyz/c/agent-rest-stop-mcp-manifest-generator-e56be19e/llms.txt): $0.01/call via x402. Generates a .well-known/mcp.json document describing an agent's tools and identity
- [Agent Rest Stop SnapshotDiff](https://www.zero.xyz/c/agent-rest-stop-snapshotdiff-a00af9ec/llms.txt): $0.01/call via x402. Diffs two locker objects at the top level, returning a comparison of their fields by key.
- [Agent Rest Stop Token Swap Quote](https://www.zero.xyz/c/agent-rest-stop-token-swap-quote-068a26d6/llms.txt): $0.01/call via x402. Returns a single swap ticket (rate/quote) for a given token pair and amount
- [Agent Rest Stop – SchemaGate](https://www.zero.xyz/c/agent-rest-stop-schemagate-8483c80f/llms.txt): $0.01/call via x402. Validates that a payload conforms to a given schema by checking required keys and their types, returning a pass or fail result.
- [Agent Rest Stop – AddressPack](https://www.zero.xyz/c/agent-rest-stop-addresspack-34ebb6e4/llms.txt): $0.01/call via x402. Packages a blockchain address, chain ID, and optional memo into a single ready-to-forward object for the next agent hop.
- [Agent Rest Stop – Two Quote Minimum](https://www.zero.xyz/c/agent-rest-stop-two-quote-minimum-96bded97/llms.txt): $0.01/call via x402. Accepts two labeled price quotes and returns the smaller (cheaper) one.
- [Agent Rest Stop – Route One Hop Lookup](https://www.zero.xyz/c/agent-rest-stop-route-one-hop-lookup-62f8d92f/llms.txt): $0.01/call via x402. Returns a single venue (hop) from a pre-defined route table given a starting and ending asset or location.
- [Agent Rest Stop – Add Guest Card (24h)](https://www.zero.xyz/c/agent-rest-stop-add-guest-card-24h-cc832a8a/llms.txt): $0.01/call via x402. Registers a guest card entry valid for 24 hours, associated with a payer identity.
- [Agent Rest Stop – BackupKey](https://www.zero.xyz/c/agent-rest-stop-backupkey-2866a06c/llms.txt): $0.01/call via x402. Returns the latest backup object key and its age in seconds for agent state recovery
- [Agent Rest Stop – RetryAfter Lookup](https://www.zero.xyz/c/agent-rest-stop-retryafter-lookup-b7f22093/llms.txt): $0.01/call via x402. Returns a fixed number of seconds to wait (retry-after delay) looked up from a static table, given a status input.
- [Agent Rest Stop – Receipt Archive](https://www.zero.xyz/c/agent-rest-stop-receipt-archive-c2add627/llms.txt): $0.01/call via x402. Appends a single receipt line entry to an agent's receipt archive.
- [Agent Rest Stop BannerPack](https://www.zero.xyz/c/agent-rest-stop-bannerpack-67f5692d/llms.txt): $0.01/call via x402. Returns both SVG URLs and embed codes for a single banner/tool identified by ID
- [Agent Rest Stop – Fallback URL Lookup](https://www.zero.xyz/c/agent-rest-stop-fallback-url-lookup-afe72bcb/llms.txt): $0.01/call via x402. Returns the fallback URL for a given tool when its primary health check is stale or failing.
- [Agent Rest Stop – CiteLine](https://www.zero.xyz/c/agent-rest-stop-citeline-49eaf297/llms.txt): $0.01/call via x402. Returns a single machine-readable citation line for a tool, identified by ID.
- [Agent Rest Stop – RelayCard Forward Pointer Store](https://www.zero.xyz/c/agent-rest-stop-relaycard-forward-pointer-store-0ff8e241/llms.txt): $0.01/call via x402. Stores a forward pointer (relay card) associating a seen_by agent identifier with a registry URL for later lookup.
- [Agent Rest Stop Health Ticket](https://www.zero.xyz/c/agent-rest-stop-health-ticket-3bfe3b37/llms.txt): $0.01/call via x402. Returns a compact health status check (mirror of /healthz) for the agent-gas-station service, confirming the system is operational.
- [Agent Rest Stop – WallSlice Banner Embeds](https://www.zero.xyz/c/agent-rest-stop-wallslice-banner-embeds-b4fedcf5/llms.txt): $0.01/call via x402. Returns five banner embed objects for a specified group identifier.
- [Agent Rest Stop – FreshList](https://www.zero.xyz/c/agent-rest-stop-freshlist-8ae15270/llms.txt): $0.01/call via x402. Returns a list of tools and guest cards that were touched (accessed or used) within a specified time window.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)