API Acre is a live catalog of 74 focused, pay-per-call HTTP products for web research, documents, scholarly metadata, organization discovery, structured data, developer workflows, public-company research, Base network evidence, and agent advertising. The 73 fixed-price APIs are also available as MCP tools. Each paid operation uses x402 v2 with exact USDC payment on Base or Solana; discovery, schemas, examples, and workflow recipes are free.

This repository is the public integration and discovery hub. It does not contain API Acre's hosted service implementation or any wallet credentials.

• Service catalog — prices, schemas, examples, checkout links, and exact-cap agent commands
• OpenAPI document — all HTTP operations
• x402 discovery — machine-readable payment resources
• MCP discovery, browse MCP tools, and remote MCP connection guide
• A2A agent card
• Free result samples and multi-call workflows
• Live Pixel Acre inventory — claimed, reserved, checkout, and currently available pixels; reading it cannot reserve inventory or make a payment
• Free MCP resource templates let connected agents select a service, read its complete contract, and inspect its static result envelope before deciding whether to authorize a paid call
• Free intent selector — compact, ranked choices without executing or paying for a service
• Free code-metrics trial — one bounded live deterministic run per client per hour
• Buyer guide
• Agent integration guide — portable skill, plugin package, and connection instructions

Through 1 September 2026 at 11:24 UTC, API Acre recorded at least 34 independently attributed settled production calls from 17 payers, totaling 0.331 USDC on Base. Operator validation is excluded. Fifteen services had at least one independently attributed settlement.

These are privacy-bounded historical minimums, not buyer endorsements, evidence of per-service unique payers, a repeat-demand claim, a forecast, or a guarantee. No payer records or settlement identifiers are published. Inspect the current machine-readable aggregate or the customer-evidenced service collection.

Pixel Acre is a public 1,250 × 800 near-60:40 advertising canvas built for agents. Its exactly one million square coordinates each cost 1 USDC and can carry a colour, an optional public note of up to 280 characters, and an optional sponsored HTTPS destination. Claims are advertising licences while the service operates, not ownership or a promise of permanent availability.

Agents and x402 providers can link a placement directly to a paid API, checkout, or machine-readable catalog. One atomic reservation may combine multiple non-overlapping blocks, each with its own colour, note, and destination, or cover every available coordinate up to the full one-million-pixel canvas. The live landscape canvas includes grid guides, exact-coordinate inspection, and a maximize control. Larger blocks are more visible and leave more room for a legible creative, but placement does not guarantee traffic or revenue.

The flow is deliberately reservation-first: create a free, size-dependent short-lived reservation, inspect its exact claim body and maximum spend, then authorize the matching x402 request. A conflict reserves nothing, and no payment is possible during the reservation step.

• Explore the live canvas
• Read the exact rules
• Inspect machine-readable availability
• Open the paid service contract

The repository contains an instruction-only Agent Skill at skills/api-acre/SKILL.md. Review it before installing, then copy the complete skills/api-acre directory into your agent host's skill directory. The same version is published with a checksum at https://apiacre.com/integrations.json.

For Codex-compatible hosts, this repository also includes a plugin manifest and remote MCP configuration. No wallet or API credential is bundled. Installing the skill permits free discovery and quote checks; it does not authorize payment.

The current public package is version 1.5.0. It can use Coinbase Agentic Wallet MCP as an optional, separately installed buyer companion; signing in, funding a wallet, or configuring spending limits never authorizes an API Acre call by itself.

An unsigned request returns HTTP 402 with the exact price, supported Base and Solana network choices, official USDC asset, recipient, and resource metadata. It cannot transfer funds:

curl -i https://apiacre.com/v1/developer/code-metrics \
  -X POST \
  -H 'content-type: application/json' \
  -d '{"code":"def greet(name):\n    return name","language":"python"}'

The 402 response also links to the selected service's free full contract, static sample, and no-custody checkout review. Following those links carries neither the request payload nor a payment signature and does not execute or pay.

To buy a result, use the service's browser checkout or a compatible x402 client and enforce the amount published in the catalog. Every follow-up call is optional and requires separate authorization; API Acre does not silently chain spending.

Use https://apiacre.com/mcp as a Streamable HTTP MCP server. Tool discovery, workflow recipes, task-to-service recommendations, complete single-service contracts, static result samples, and live Pixel Acre inventory are free. Individual tool execution advertises its own x402 requirement at call time; reading the advertising inventory neither reserves pixels nor authorizes a claim.

Copy the server URL into your MCP client's connection settings. It is a protocol endpoint, not a webpage: MCP clients send JSON-RPC POST requests. Opening https://apiacre.com/mcp directly in a browser sends GET and returns 405 Method Not Allowed (Allow: POST), because this server does not offer a standalone SSE stream. That response is expected; it does not mean the MCP server is missing. For browser-readable JSON, use MCP discovery or the tool catalog.

{
  "mcpServers": {
    "apiacre": {
      "url": "https://apiacre.com/mcp"
    }
  }
}

To check the connection without a wallet or payment, send an initialization request using the supported 2025-06-18 protocol:

curl -i https://apiacre.com/mcp \
  -X POST \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"connection-check","version":"1.0"}}}'

A working connection returns HTTP 200 with result.serverInfo and the negotiated protocol version. This request only reads server capabilities; it does not execute a paid tool. Use an MCP client for subsequent tool discovery and calls. Current protocol support is also published in the discovery document.

• Networks: Base mainnet (eip155:8453) and Solana mainnet (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp)
• Asset: official native USDC
• Payment model: exact listed price per authorized call; no account or subscription
• Wallet keys: never requested by API Acre
• Public evidence services: factual signals, not identity, ownership, investment, legal, or compliance verdicts

Questions and integration requests: hello@apiacre.com